summaryrefslogtreecommitdiff
path: root/builtin/apply.c
blob: 6696ea4c3ffd4f7af04f3f56609a78a74a0a0b55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
/*
 * apply.c
 *
 * Copyright (C) Linus Torvalds, 2005
 *
 * This applies patches on top of some (arbitrary) version of the SCM.
 *
 */
#include "cache.h"
#include "lockfile.h"
#include "cache-tree.h"
#include "quote.h"
#include "blob.h"
#include "delta.h"
#include "builtin.h"
#include "string-list.h"
#include "dir.h"
#include "diff.h"
#include "parse-options.h"
#include "xdiff-interface.h"
#include "ll-merge.h"
#include "rerere.h"
 
/*
 *  --check turns on checking that the working tree matches the
 *    files that are being modified, but doesn't apply the patch
 *  --stat does just a diffstat, and doesn't actually apply
 *  --numstat does numeric diffstat, and doesn't actually apply
 *  --index-info shows the old and new index info for paths if available.
 *  --index updates the cache as well.
 *  --cached updates only the cache without ever touching the working tree.
 */
static const char *prefix;
static int prefix_length = -1;
static int newfd = -1;
 
static int unidiff_zero;
static int p_value = 1;
static int p_value_known;
static int check_index;
static int update_index;
static int cached;
static int diffstat;
static int numstat;
static int summary;
static int check;
static int apply = 1;
static int apply_in_reverse;
static int apply_with_reject;
static int apply_verbosely;
static int allow_overlap;
static int no_add;
static int threeway;
static const char *fake_ancestor;
static int line_termination = '\n';
static unsigned int p_context = UINT_MAX;
static const char * const apply_usage[] = {
	N_("git apply [options] [<patch>...]"),
	NULL
};
 
static enum ws_error_action {
	nowarn_ws_error,
	warn_on_ws_error,
	die_on_ws_error,
	correct_ws_error
} ws_error_action = warn_on_ws_error;
static int whitespace_error;
static int squelch_whitespace_errors = 5;
static int applied_after_fixing_ws;
 
static enum ws_ignore {
	ignore_ws_none,
	ignore_ws_change
} ws_ignore_action = ignore_ws_none;
 
 
static const char *patch_input_file;
static const char *root;
static int root_len;
static int read_stdin = 1;
static int options;
 
static void parse_whitespace_option(const char *option)
{
	if (!option) {
		ws_error_action = warn_on_ws_error;
		return;
	}
	if (!strcmp(option, "warn")) {
		ws_error_action = warn_on_ws_error;
		return;
	}
	if (!strcmp(option, "nowarn")) {
		ws_error_action = nowarn_ws_error;
		return;
	}
	if (!strcmp(option, "error")) {
		ws_error_action = die_on_ws_error;
		return;
	}
	if (!strcmp(option, "error-all")) {
		ws_error_action = die_on_ws_error;
		squelch_whitespace_errors = 0;
		return;
	}
	if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
		ws_error_action = correct_ws_error;
		return;
	}
	die(_("unrecognized whitespace option '%s'"), option);
}
 
static void parse_ignorewhitespace_option(const char *option)
{
	if (!option || !strcmp(option, "no") ||
	    !strcmp(option, "false") || !strcmp(option, "never") ||
	    !strcmp(option, "none")) {
		ws_ignore_action = ignore_ws_none;
		return;
	}
	if (!strcmp(option, "change")) {
		ws_ignore_action = ignore_ws_change;
		return;
	}
	die(_("unrecognized whitespace ignore option '%s'"), option);
}
 
static void set_default_whitespace_mode(const char *whitespace_option)
{
	if (!whitespace_option && !apply_default_whitespace)
		ws_error_action = (apply ? warn_on_ws_error : nowarn_ws_error);
}
 
/*
 * For "diff-stat" like behaviour, we keep track of the biggest change
 * we've seen, and the longest filename. That allows us to do simple
 * scaling.
 */
static int max_change, max_len;
 
/*
 * Various "current state", notably line numbers and what
 * file (and how) we're patching right now.. The "is_xxxx"
 * things are flags, where -1 means "don't know yet".
 */
static int linenr = 1;
 
/*
 * This represents one "hunk" from a patch, starting with
 * "@@ -oldpos,oldlines +newpos,newlines @@" marker.  The
 * patch text is pointed at by patch, and its byte length
 * is stored in size.  leading and trailing are the number
 * of context lines.
 */
struct fragment {
	unsigned long leading, trailing;
	unsigned long oldpos, oldlines;
	unsigned long newpos, newlines;
	/*
	 * 'patch' is usually borrowed from buf in apply_patch(),
	 * but some codepaths store an allocated buffer.
	 */
	const char *patch;
	unsigned free_patch:1,
		rejected:1;
	int size;
	int linenr;
	struct fragment *next;
};
 
/*
 * When dealing with a binary patch, we reuse "leading" field
 * to store the type of the binary hunk, either deflated "delta"
 * or deflated "literal".
 */
#define binary_patch_method leading
#define BINARY_DELTA_DEFLATED	1
#define BINARY_LITERAL_DEFLATED 2
 
/*
 * This represents a "patch" to a file, both metainfo changes
 * such as creation/deletion, filemode and content changes represented
 * as a series of fragments.
 */
struct patch {
	char *new_name, *old_name, *def_name;
	unsigned int old_mode, new_mode;
	int is_new, is_delete;	/* -1 = unknown, 0 = false, 1 = true */
	int rejected;
	unsigned ws_rule;
	int lines_added, lines_deleted;
	int score;
	unsigned int is_toplevel_relative:1;
	unsigned int inaccurate_eof:1;
	unsigned int is_binary:1;
	unsigned int is_copy:1;
	unsigned int is_rename:1;
	unsigned int recount:1;
	unsigned int conflicted_threeway:1;
	unsigned int direct_to_threeway:1;
	struct fragment *fragments;
	char *result;
	size_t resultsize;
	char old_sha1_prefix[41];
	char new_sha1_prefix[41];
	struct patch *next;
 
	/* three-way fallback result */
	unsigned char threeway_stage[3][20];
};
 
static void free_fragment_list(struct fragment *list)
{
	while (list) {
		struct fragment *next = list->next;
		if (list->free_patch)
			free((char *)list->patch);
		free(list);
		list = next;
	}
}
 
static void free_patch(struct patch *patch)
{
	free_fragment_list(patch->fragments);
	free(patch->def_name);
	free(patch->old_name);
	free(patch->new_name);
	free(patch->result);
	free(patch);
}
 
static void free_patch_list(struct patch *list)
{
	while (list) {
		struct patch *next = list->next;
		free_patch(list);
		list = next;
	}
}
 
/*
 * A line in a file, len-bytes long (includes the terminating LF,
 * except for an incomplete line at the end if the file ends with
 * one), and its contents hashes to 'hash'.
 */
struct line {
	size_t len;
	unsigned hash : 24;
	unsigned flag : 8;
#define LINE_COMMON     1
#define LINE_PATCHED	2
};
 
/*
 * This represents a "file", which is an array of "lines".
 */
struct image {
	char *buf;
	size_t len;
	size_t nr;
	size_t alloc;
	struct line *line_allocated;
	struct line *line;
};
 
/*
 * Records filenames that have been touched, in order to handle
 * the case where more than one patches touch the same file.
 */
 
static struct string_list fn_table;
 
static uint32_t hash_line(const char *cp, size_t len)
{
	size_t i;
	uint32_t h;
	for (i = 0, h = 0; i < len; i++) {
		if (!isspace(cp[i])) {
			h = h * 3 + (cp[i] & 0xff);
		}
	}
	return h;
}
 
/*
 * Compare lines s1 of length n1 and s2 of length n2, ignoring
 * whitespace difference. Returns 1 if they match, 0 otherwise
 */
static int fuzzy_matchlines(const char *s1, size_t n1,
			    const char *s2, size_t n2)
{
	const char *last1 = s1 + n1 - 1;
	const char *last2 = s2 + n2 - 1;
	int result = 0;
 
	/* ignore line endings */
	while ((*last1 == '\r') || (*last1 == '\n'))
		last1--;
	while ((*last2 == '\r') || (*last2 == '\n'))
		last2--;
 
	/* skip leading whitespaces, if both begin with whitespace */
	if (s1 <= last1 && s2 <= last2 && isspace(*s1) && isspace(*s2)) {
		while (isspace(*s1) && (s1 <= last1))
			s1++;
		while (isspace(*s2) && (s2 <= last2))
			s2++;
	}
	/* early return if both lines are empty */
	if ((s1 > last1) && (s2 > last2))
		return 1;
	while (!result) {
		result = *s1++ - *s2++;
		/*
		 * Skip whitespace inside. We check for whitespace on
		 * both buffers because we don't want "a b" to match
		 * "ab"
		 */
		if (isspace(*s1) && isspace(*s2)) {
			while (isspace(*s1) && s1 <= last1)
				s1++;
			while (isspace(*s2) && s2 <= last2)
				s2++;
		}
		/*
		 * If we reached the end on one side only,
		 * lines don't match
		 */
		if (
		    ((s2 > last2) && (s1 <= last1)) ||
		    ((s1 > last1) && (s2 <= last2)))
			return 0;
		if ((s1 > last1) && (s2 > last2))
			break;
	}
 
	return !result;
}
 
static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
{
	ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
	img->line_allocated[img->nr].len = len;
	img->line_allocated[img->nr].hash = hash_line(bol, len);
	img->line_allocated[img->nr].flag = flag;
	img->nr++;
}
 
/*
 * "buf" has the file contents to be patched (read from various sources).
 * attach it to "image" and add line-based index to it.
 * "image" now owns the "buf".
 */
static void prepare_image(struct image *image, char *buf, size_t len,
			  int prepare_linetable)
{
	const char *cp, *ep;
 
	memset(image, 0, sizeof(*image));
	image->buf = buf;
	image->len = len;
 
	if (!prepare_linetable)
		return;
 
	ep = image->buf + image->len;
	cp = image->buf;
	while (cp < ep) {
		const char *next;
		for (next = cp; next < ep && *next != '\n'; next++)
			;
		if (next < ep)
			next++;
		add_line_info(image, cp, next - cp, 0);
		cp = next;
	}
	image->line = image->line_allocated;
}
 
static void clear_image(struct image *image)
{
	free(image->buf);
	free(image->line_allocated);
	memset(image, 0, sizeof(*image));
}
 
/* fmt must contain _one_ %s and no other substitution */
static void say_patch_name(FILE *output, const char *fmt, struct patch *patch)
{
	struct strbuf sb = STRBUF_INIT;
 
	if (patch->old_name && patch->new_name &&
	    strcmp(patch->old_name, patch->new_name)) {
		quote_c_style(patch->old_name, &sb, NULL, 0);
		strbuf_addstr(&sb, " => ");
		quote_c_style(patch->new_name, &sb, NULL, 0);
	} else {
		const char *n = patch->new_name;
		if (!n)
			n = patch->old_name;
		quote_c_style(n, &sb, NULL, 0);
	}
	fprintf(output, fmt, sb.buf);
	fputc('\n', output);
	strbuf_release(&sb);
}
 
#define SLOP (16)
 
static void read_patch_file(struct strbuf *sb, int fd)
{
	if (strbuf_read(sb, fd, 0) < 0)
		die_errno("git apply: failed to read");
 
	/*
	 * Make sure that we have some slop in the buffer
	 * so that we can do speculative "memcmp" etc, and
	 * see to it that it is NUL-filled.
	 */
	strbuf_grow(sb, SLOP);
	memset(sb->buf + sb->len, 0, SLOP);
}
 
static unsigned long linelen(const char *buffer, unsigned long size)
{
	unsigned long len = 0;
	while (size--) {
		len++;
		if (*buffer++ == '\n')
			break;
	}
	return len;
}
 
static int is_dev_null(const char *str)
{
	return skip_prefix(str, "/dev/null", &str) && isspace(*str);
}
 
#define TERM_SPACE	1
#define TERM_TAB	2
 
static int name_terminate(const char *name, int namelen, int c, int terminate)
{
	if (c == ' ' && !(terminate & TERM_SPACE))
		return 0;
	if (c == '\t' && !(terminate & TERM_TAB))
		return 0;
 
	return 1;
}
 
/* remove double slashes to make --index work with such filenames */
static char *squash_slash(char *name)
{
	int i = 0, j = 0;
 
	if (!name)
		return NULL;
 
	while (name[i]) {
		if ((name[j++] = name[i++]) == '/')
			while (name[i] == '/')
				i++;
	}
	name[j] = '\0';
	return name;
}
 
static char *find_name_gnu(const char *line, const char *def, int p_value)
{
	struct strbuf name = STRBUF_INIT;
	char *cp;
 
	/*
	 * Proposed "new-style" GNU patch/diff format; see
	 * http://marc.info/?l=git&m=112927316408690&w=2
	 */
	if (unquote_c_style(&name, line, NULL)) {
		strbuf_release(&name);
		return NULL;
	}
 
	for (cp = name.buf; p_value; p_value--) {
		cp = strchr(cp, '/');
		if (!cp) {
			strbuf_release(&name);
			return NULL;
		}
		cp++;
	}
 
	strbuf_remove(&name, 0, cp - name.buf);
	if (root)
		strbuf_insert(&name, 0, root, root_len);
	return squash_slash(strbuf_detach(&name, NULL));
}
 
static size_t sane_tz_len(const char *line, size_t len)
{
	const char *tz, *p;
 
	if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ')
		return 0;
	tz = line + len - strlen(" +0500");
 
	if (tz[1] != '+' && tz[1] != '-')
		return 0;
 
	for (p = tz + 2; p != line + len; p++)
		if (!isdigit(*p))
			return 0;
 
	return line + len - tz;
}
 
static size_t tz_with_colon_len(const char *line, size_t len)
{
	const char *tz, *p;
 
	if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':')
		return 0;
	tz = line + len - strlen(" +08:00");
 
	if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-'))
		return 0;
	p = tz + 2;
	if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
	    !isdigit(*p++) || !isdigit(*p++))
		return 0;
 
	return line + len - tz;
}
 
static size_t date_len(const char *line, size_t len)
{
	const char *date, *p;
 
	if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-')
		return 0;
	p = date = line + len - strlen("72-02-05");
 
	if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
	    !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
	    !isdigit(*p++) || !isdigit(*p++))	/* Not a date. */
		return 0;
 
	if (date - line >= strlen("19") &&
	    isdigit(date[-1]) && isdigit(date[-2]))	/* 4-digit year */
		date -= strlen("19");
 
	return line + len - date;
}
 
static size_t short_time_len(const char *line, size_t len)
{
	const char *time, *p;
 
	if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':')
		return 0;
	p = time = line + len - strlen(" 07:01:32");
 
	/* Permit 1-digit hours? */
	if (*p++ != ' ' ||
	    !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
	    !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
	    !isdigit(*p++) || !isdigit(*p++))	/* Not a time. */
		return 0;
 
	return line + len - time;
}
 
static size_t fractional_time_len(const char *line, size_t len)
{
	const char *p;
	size_t n;
 
	/* Expected format: 19:41:17.620000023 */
	if (!len || !isdigit(line[len - 1]))
		return 0;
	p = line + len - 1;
 
	/* Fractional seconds. */
	while (p > line && isdigit(*p))
		p--;
	if (*p != '.')
		return 0;
 
	/* Hours, minutes, and whole seconds. */
	n = short_time_len(line, p - line);
	if (!n)
		return 0;
 
	return line + len - p + n;
}
 
static size_t trailing_spaces_len(const char *line, size_t len)
{
	const char *p;
 
	/* Expected format: ' ' x (1 or more)  */
	if (!len || line[len - 1] != ' ')
		return 0;
 
	p = line + len;
	while (p != line) {
		p--;
		if (*p != ' ')
			return line + len - (p + 1);
	}
 
	/* All spaces! */
	return len;
}
 
static size_t diff_timestamp_len(const char *line, size_t len)
{
	const char *end = line + len;
	size_t n;
 
	/*
	 * Posix: 2010-07-05 19:41:17
	 * GNU: 2010-07-05 19:41:17.620000023 -0500
	 */
 
	if (!isdigit(end[-1]))
		return 0;
 
	n = sane_tz_len(line, end - line);
	if (!n)
		n = tz_with_colon_len(line, end - line);
	end -= n;
 
	n = short_time_len(line, end - line);
	if (!n)
		n = fractional_time_len(line, end - line);
	end -= n;
 
	n = date_len(line, end - line);
	if (!n)	/* No date.  Too bad. */
		return 0;
	end -= n;
 
	if (end == line)	/* No space before date. */
		return 0;
	if (end[-1] == '\t') {	/* Success! */
		end--;
		return line + len - end;
	}
	if (end[-1] != ' ')	/* No space before date. */
		return 0;
 
	/* Whitespace damage. */
	end -= trailing_spaces_len(line, end - line);
	return line + len - end;
}
 
static char *null_strdup(const char *s)
{
	return s ? xstrdup(s) : NULL;
}
 
static char *find_name_common(const char *line, const char *def,
			      int p_value, const char *end, int terminate)
{
	int len;
	const char *start = NULL;
 
	if (p_value == 0)
		start = line;
	while (line != end) {
		char c = *line;
 
		if (!end && isspace(c)) {
			if (c == '\n')
				break;
			if (name_terminate(start, line-start, c, terminate))
				break;
		}
		line++;
		if (c == '/' && !--p_value)
			start = line;
	}
	if (!start)
		return squash_slash(null_strdup(def));
	len = line - start;
	if (!len)
		return squash_slash(null_strdup(def));
 
	/*
	 * Generally we prefer the shorter name, especially
	 * if the other one is just a variation of that with
	 * something else tacked on to the end (ie "file.orig"
	 * or "file~").
	 */
	if (def) {
		int deflen = strlen(def);
		if (deflen < len && !strncmp(start, def, deflen))
			return squash_slash(xstrdup(def));
	}
 
	if (root) {
		char *ret = xmalloc(root_len + len + 1);
		strcpy(ret, root);
		memcpy(ret + root_len, start, len);
		ret[root_len + len] = '\0';
		return squash_slash(ret);
	}
 
	return squash_slash(xmemdupz(start, len));
}
 
static char *find_name(const char *line, char *def, int p_value, int terminate)
{
	if (*line == '"') {
		char *name = find_name_gnu(line, def, p_value);
		if (name)
			return name;
	}
 
	return find_name_common(line, def, p_value, NULL, terminate);
}
 
static char *find_name_traditional(const char *line, char *def, int p_value)
{
	size_t len;
	size_t date_len;
 
	if (*line == '"') {
		char *name = find_name_gnu(line, def, p_value);
		if (name)
			return name;
	}
 
	len = strchrnul(line, '\n') - line;
	date_len = diff_timestamp_len(line, len);
	if (!date_len)
		return find_name_common(line, def, p_value, NULL, TERM_TAB);
	len -= date_len;
 
	return find_name_common(line, def, p_value, line + len, 0);
}
 
static int count_slashes(const char *cp)
{
	int cnt = 0;
	char ch;
 
	while ((ch = *cp++))
		if (ch == '/')
			cnt++;
	return cnt;
}
 
/*
 * Given the string after "--- " or "+++ ", guess the appropriate
 * p_value for the given patch.
 */
static int guess_p_value(const char *nameline)
{
	char *name, *cp;
	int val = -1;
 
	if (is_dev_null(nameline))
		return -1;
	name = find_name_traditional(nameline, NULL, 0);
	if (!name)
		return -1;
	cp = strchr(name, '/');
	if (!cp)
		val = 0;
	else if (prefix) {
		/*
		 * Does it begin with "a/$our-prefix" and such?  Then this is
		 * very likely to apply to our directory.
		 */
		if (!strncmp(name, prefix, prefix_length))
			val = count_slashes(prefix);
		else {
			cp++;
			if (!strncmp(cp, prefix, prefix_length))
				val = count_slashes(prefix) + 1;
		}
	}
	free(name);
	return val;
}
 
/*
 * Does the ---/+++ line has the POSIX timestamp after the last HT?
 * GNU diff puts epoch there to signal a creation/deletion event.  Is
 * this such a timestamp?
 */
static int has_epoch_timestamp(const char *nameline)
{
	/*
	 * We are only interested in epoch timestamp; any non-zero
	 * fraction cannot be one, hence "(\.0+)?" in the regexp below.
	 * For the same reason, the date must be either 1969-12-31 or
	 * 1970-01-01, and the seconds part must be "00".
	 */
	const char stamp_regexp[] =
		"^(1969-12-31|1970-01-01)"
		" "
		"[0-2][0-9]:[0-5][0-9]:00(\\.0+)?"
		" "
		"([-+][0-2][0-9]:?[0-5][0-9])\n";
	const char *timestamp = NULL, *cp, *colon;
	static regex_t *stamp;
	regmatch_t m[10];
	int zoneoffset;
	int hourminute;
	int status;
 
	for (cp = nameline; *cp != '\n'; cp++) {
		if (*cp == '\t')
			timestamp = cp + 1;
	}
	if (!timestamp)
		return 0;
	if (!stamp) {
		stamp = xmalloc(sizeof(*stamp));
		if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
			warning(_("Cannot prepare timestamp regexp %s"),
				stamp_regexp);
			return 0;
		}
	}
 
	status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
	if (status) {
		if (status != REG_NOMATCH)
			warning(_("regexec returned %d for input: %s"),
				status, timestamp);
		return 0;
	}
 
	zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10);
	if (*colon == ':')
		zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10);
	else
		zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100);
	if (timestamp[m[3].rm_so] == '-')
		zoneoffset = -zoneoffset;
 
	/*
	 * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31
	 * (west of GMT) or 1970-01-01 (east of GMT)
	 */
	if ((zoneoffset < 0 && memcmp(timestamp, "1969-12-31", 10)) ||
	    (0 <= zoneoffset && memcmp(timestamp, "1970-01-01", 10)))
		return 0;
 
	hourminute = (strtol(timestamp + 11, NULL, 10) * 60 +
		      strtol(timestamp + 14, NULL, 10) -
		      zoneoffset);
 
	return ((zoneoffset < 0 && hourminute == 1440) ||
		(0 <= zoneoffset && !hourminute));
}
 
/*
 * Get the name etc info from the ---/+++ lines of a traditional patch header
 *
 * FIXME! The end-of-filename heuristics are kind of screwy. For existing
 * files, we can happily check the index for a match, but for creating a
 * new file we should try to match whatever "patch" does. I have no idea.
 */
static void parse_traditional_patch(const char *first, const char *second, struct patch *patch)
{
	char *name;
 
	first += 4;	/* skip "--- " */
	second += 4;	/* skip "+++ " */
	if (!p_value_known) {
		int p, q;
		p = guess_p_value(first);
		q = guess_p_value(second);
		if (p < 0) p = q;
		if (0 <= p && p == q) {
			p_value = p;
			p_value_known = 1;
		}
	}
	if (is_dev_null(first)) {
		patch->is_new = 1;
		patch->is_delete = 0;
		name = find_name_traditional(second, NULL, p_value);
		patch->new_name = name;
	} else if (is_dev_null(second)) {
		patch->is_new = 0;
		patch->is_delete = 1;
		name = find_name_traditional(first, NULL, p_value);
		patch->old_name = name;
	} else {
		char *first_name;
		first_name = find_name_traditional(first, NULL, p_value);
		name = find_name_traditional(second, first_name, p_value);
		free(first_name);
		if (has_epoch_timestamp(first)) {
			patch->is_new = 1;
			patch->is_delete = 0;
			patch->new_name = name;
		} else if (has_epoch_timestamp(second)) {
			patch->is_new = 0;
			patch->is_delete = 1;
			patch->old_name = name;
		} else {
			patch->old_name = name;
			patch->new_name = null_strdup(name);
		}
	}
	if (!name)
		die(_("unable to find filename in patch at line %d"), linenr);
}
 
static int gitdiff_hdrend(const char *line, struct patch *patch)
{
	return -1;
}
 
/*
 * We're anal about diff header consistency, to make
 * sure that we don't end up having strange ambiguous
 * patches floating around.
 *
 * As a result, gitdiff_{old|new}name() will check
 * their names against any previous information, just
 * to make sure..
 */
#define DIFF_OLD_NAME 0
#define DIFF_NEW_NAME 1
 
static char *gitdiff_verify_name(const char *line, int isnull, char *orig_name, int side)
{
	if (!orig_name && !isnull)
		return find_name(line, NULL, p_value, TERM_TAB);
 
	if (orig_name) {
		int len;
		const char *name;
		char *another;
		name = orig_name;
		len = strlen(name);
		if (isnull)
			die(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"), name, linenr);
		another = find_name(line, NULL, p_value, TERM_TAB);
		if (!another || memcmp(another, name, len + 1))
			die((side == DIFF_NEW_NAME) ?
			    _("git apply: bad git-diff - inconsistent new filename on line %d") :
			    _("git apply: bad git-diff - inconsistent old filename on line %d"), linenr);
		free(another);
		return orig_name;
	}
	else {
		/* expect "/dev/null" */
		if (memcmp("/dev/null", line, 9) || line[9] != '\n')
			die(_("git apply: bad git-diff - expected /dev/null on line %d"), linenr);
		return NULL;
	}
}
 
static int gitdiff_oldname(const char *line, struct patch *patch)
{
	char *orig = patch->old_name;
	patch->old_name = gitdiff_verify_name(line, patch->is_new, patch->old_name,
					      DIFF_OLD_NAME);
	if (orig != patch->old_name)
		free(orig);
	return 0;
}
 
static int gitdiff_newname(const char *line, struct patch *patch)
{
	char *orig = patch->new_name;
	patch->new_name = gitdiff_verify_name(line, patch->is_delete, patch->new_name,
					      DIFF_NEW_NAME);
	if (orig != patch->new_name)
		free(orig);
	return 0;
}
 
static int gitdiff_oldmode(const char *line, struct patch *patch)
{
	patch->old_mode = strtoul(line, NULL, 8);
	return 0;
}
 
static int gitdiff_newmode(const char *line, struct patch *patch)
{
	patch->new_mode = strtoul(line, NULL, 8);
	return 0;
}
 
static int gitdiff_delete(const char *line, struct patch *patch)
{
	patch->is_delete = 1;
	free(patch->old_name);
	patch->old_name = null_strdup(patch->def_name);
	return gitdiff_oldmode(line, patch);
}
 
static int gitdiff_newfile(const char *line, struct patch *patch)
{
	patch->is_new = 1;
	free(patch->new_name);
	patch->new_name = null_strdup(patch->def_name);
	return gitdiff_newmode(line, patch);
}
 
static int gitdiff_copysrc(const char *line, struct patch *patch)
{
	patch->is_copy = 1;
	free(patch->old_name);
	patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
	return 0;
}
 
static int gitdiff_copydst(const char *line, struct patch *patch)
{
	patch->is_copy = 1;
	free(patch->new_name);
	patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
	return 0;
}
 
static int gitdiff_renamesrc(const char *line, struct patch *patch)
{
	patch->is_rename = 1;
	free(patch->old_name);
	patch->old_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
	return 0;
}
 
static int gitdiff_renamedst(const char *line, struct patch *patch)
{
	patch->is_rename = 1;
	free(patch->new_name);
	patch->new_name = find_name(line, NULL, p_value ? p_value - 1 : 0, 0);
	return 0;
}
 
static int gitdiff_similarity(const char *line, struct patch *patch)
{
	unsigned long val = strtoul(line, NULL, 10);
	if (val <= 100)
		patch->score = val;
	return 0;
}
 
static int gitdiff_dissimilarity(const char *line, struct patch *patch)
{
	unsigned long val = strtoul(line, NULL, 10);
	if (val <= 100)
		patch->score = val;
	return 0;
}
 
static int gitdiff_index(const char *line, struct patch *patch)
{
	/*
	 * index line is N hexadecimal, "..", N hexadecimal,
	 * and optional space with octal mode.
	 */
	const char *ptr, *eol;
	int len;
 
	ptr = strchr(line, '.');
	if (!ptr || ptr[1] != '.' || 40 < ptr - line)
		return 0;
	len = ptr - line;
	memcpy(patch->old_sha1_prefix, line, len);
	patch->old_sha1_prefix[len] = 0;
 
	line = ptr + 2;
	ptr = strchr(line, ' ');
	eol = strchrnul(line, '\n');
 
	if (!ptr || eol < ptr)
		ptr = eol;
	len = ptr - line;
 
	if (40 < len)
		return 0;
	memcpy(patch->new_sha1_prefix, line, len);
	patch->new_sha1_prefix[len] = 0;
	if (*ptr == ' ')
		patch->old_mode = strtoul(ptr+1, NULL, 8);
	return 0;
}
 
/*
 * This is normal for a diff that doesn't change anything: we'll fall through
 * into the next diff. Tell the parser to break out.
 */
static int gitdiff_unrecognized(const char *line, struct patch *patch)
{
	return -1;
}
 
/*
 * Skip p_value leading components from "line"; as we do not accept
 * absolute paths, return NULL in that case.
 */
static const char *skip_tree_prefix(const char *line, int llen)
{
	int nslash;
	int i;
 
	if (!p_value)
		return (llen && line[0] == '/') ? NULL : line;
 
	nslash = p_value;
	for (i = 0; i < llen; i++) {
		int ch = line[i];
		if (ch == '/' && --nslash <= 0)
			return (i == 0) ? NULL : &line[i + 1];
	}
	return NULL;
}
 
/*
 * This is to extract the same name that appears on "diff --git"
 * line.  We do not find and return anything if it is a rename
 * patch, and it is OK because we will find the name elsewhere.
 * We need to reliably find name only when it is mode-change only,
 * creation or deletion of an empty file.  In any of these cases,
 * both sides are the same name under a/ and b/ respectively.
 */
static char *git_header_name(const char *line, int llen)
{
	const char *name;
	const char *second = NULL;
	size_t len, line_len;
 
	line += strlen("diff --git ");
	llen -= strlen("diff --git ");
 
	if (*line == '"') {
		const char *cp;
		struct strbuf first = STRBUF_INIT;
		struct strbuf sp = STRBUF_INIT;
 
		if (unquote_c_style(&first, line, &second))
			goto free_and_fail1;
 
		/* strip the a/b prefix including trailing slash */
		cp = skip_tree_prefix(first.buf, first.len);
		if (!cp)
			goto free_and_fail1;
		strbuf_remove(&first, 0, cp - first.buf);
 
		/*
		 * second points at one past closing dq of name.
		 * find the second name.
		 */
		while ((second < line + llen) && isspace(*second))
			second++;
 
		if (line + llen <= second)
			goto free_and_fail1;
		if (*second == '"') {
			if (unquote_c_style(&sp, second, NULL))
				goto free_and_fail1;
			cp = skip_tree_prefix(sp.buf, sp.len);
			if (!cp)
				goto free_and_fail1;
			/* They must match, otherwise ignore */
			if (strcmp(cp, first.buf))
				goto free_and_fail1;
			strbuf_release(&sp);
			return strbuf_detach(&first, NULL);
		}
 
		/* unquoted second */
		cp = skip_tree_prefix(second, line + llen - second);
		if (!cp)
			goto free_and_fail1;
		if (line + llen - cp != first.len ||
		    memcmp(first.buf, cp, first.len))
			goto free_and_fail1;
		return strbuf_detach(&first, NULL);
 
	free_and_fail1:
		strbuf_release(&first);
		strbuf_release(&sp);
		return NULL;
	}
 
	/* unquoted first name */
	name = skip_tree_prefix(line, llen);
	if (!name)
		return NULL;
 
	/*
	 * since the first name is unquoted, a dq if exists must be
	 * the beginning of the second name.
	 */
	for (second = name; second < line + llen; second++) {
		if (*second == '"') {
			struct strbuf sp = STRBUF_INIT;
			const char *np;
 
			if (unquote_c_style(&sp, second, NULL))
				goto free_and_fail2;
 
			np = skip_tree_prefix(sp.buf, sp.len);
			if (!np)
				goto free_and_fail2;
 
			len = sp.buf + sp.len - np;
			if (len < second - name &&
			    !strncmp(np, name, len) &&
			    isspace(name[len])) {
				/* Good */
				strbuf_remove(&sp, 0, np - sp.buf);
				return strbuf_detach(&sp, NULL);
			}
 
		free_and_fail2:
			strbuf_release(&sp);
			return NULL;
		}
	}
 
	/*
	 * Accept a name only if it shows up twice, exactly the same
	 * form.
	 */
	second = strchr(name, '\n');
	if (!second)
		return NULL;
	line_len = second - name;
	for (len = 0 ; ; len++) {
		switch (name[len]) {
		default:
			continue;
		case '\n':
			return NULL;
		case '\t': case ' ':
			/*
			 * Is this the separator between the preimage
			 * and the postimage pathname?  Again, we are
			 * only interested in the case where there is
			 * no rename, as this is only to set def_name
			 * and a rename patch has the names elsewhere
			 * in an unambiguous form.
			 */
			if (!name[len + 1])
				return NULL; /* no postimage name */
			second = skip_tree_prefix(name + len + 1,
						  line_len - (len + 1));
			if (!second)
				return NULL;
			/*
			 * Does len bytes starting at "name" and "second"
			 * (that are separated by one HT or SP we just
			 * found) exactly match?
			 */
			if (second[len] == '\n' && !strncmp(name, second, len))
				return xmemdupz(name, len);
		}
	}
}
 
/* Verify that we recognize the lines following a git header */
static int parse_git_header(const char *line, int len, unsigned int size, struct patch *patch)
{
	unsigned long offset;
 
	/* A git diff has explicit new/delete information, so we don't guess */
	patch->is_new = 0;
	patch->is_delete = 0;
 
	/*
	 * Some things may not have the old name in the
	 * rest of the headers anywhere (pure mode changes,
	 * or removing or adding empty files), so we get
	 * the default name from the header.
	 */
	patch->def_name = git_header_name(line, len);
	if (patch->def_name && root) {
		char *s = xstrfmt("%s%s", root, patch->def_name);
		free(patch->def_name);
		patch->def_name = s;
	}
 
	line += len;
	size -= len;
	linenr++;
	for (offset = len ; size > 0 ; offset += len, size -= len, line += len, linenr++) {
		static const struct opentry {
			const char *str;
			int (*fn)(const char *, struct patch *);
		} optable[] = {
			{ "@@ -", gitdiff_hdrend },
			{ "--- ", gitdiff_oldname },
			{ "+++ ", gitdiff_newname },
			{ "old mode ", gitdiff_oldmode },
			{ "new mode ", gitdiff_newmode },
			{ "deleted file mode ", gitdiff_delete },
			{ "new file mode ", gitdiff_newfile },
			{ "copy from ", gitdiff_copysrc },
			{ "copy to ", gitdiff_copydst },
			{ "rename old ", gitdiff_renamesrc },
			{ "rename new ", gitdiff_renamedst },
			{ "rename from ", gitdiff_renamesrc },
			{ "rename to ", gitdiff_renamedst },
			{ "similarity index ", gitdiff_similarity },
			{ "dissimilarity index ", gitdiff_dissimilarity },
			{ "index ", gitdiff_index },
			{ "", gitdiff_unrecognized },
		};
		int i;
 
		len = linelen(line, size);
		if (!len || line[len-1] != '\n')
			break;
		for (i = 0; i < ARRAY_SIZE(optable); i++) {
			const struct opentry *p = optable + i;
			int oplen = strlen(p->str);
			if (len < oplen || memcmp(p->str, line, oplen))
				continue;
			if (p->fn(line + oplen, patch) < 0)
				return offset;
			break;
		}
	}
 
	return offset;
}
 
static int parse_num(const char *line, unsigned long *p)
{
	char *ptr;
 
	if (!isdigit(*line))
		return 0;
	*p = strtoul(line, &ptr, 10);
	return ptr - line;
}
 
static int parse_range(const char *line, int len, int offset, const char *expect,
		       unsigned long *p1, unsigned long *p2)
{
	int digits, ex;
 
	if (offset < 0 || offset >= len)
		return -1;
	line += offset;
	len -= offset;
 
	digits = parse_num(line, p1);
	if (!digits)
		return -1;
 
	offset += digits;
	line += digits;
	len -= digits;
 
	*p2 = 1;
	if (*line == ',') {
		digits = parse_num(line+1, p2);
		if (!digits)
			return -1;
 
		offset += digits+1;
		line += digits+1;
		len -= digits+1;
	}
 
	ex = strlen(expect);
	if (ex > len)
		return -1;
	if (memcmp(line, expect, ex))
		return -1;
 
	return offset + ex;
}
 
static void recount_diff(const char *line, int size, struct fragment *fragment)
{
	int oldlines = 0, newlines = 0, ret = 0;
 
	if (size < 1) {
		warning("recount: ignore empty hunk");
		return;
	}
 
	for (;;) {
		int len = linelen(line, size);
		size -= len;
		line += len;
 
		if (size < 1)
			break;
 
		switch (*line) {
		case ' ': case '\n':
			newlines++;
			/* fall through */
		case '-':
			oldlines++;
			continue;
		case '+':
			newlines++;
			continue;
		case '\\':
			continue;
		case '@':
			ret = size < 3 || !starts_with(line, "@@ ");
			break;
		case 'd':
			ret = size < 5 || !starts_with(line, "diff ");
			break;
		default:
			ret = -1;
			break;
		}
		if (ret) {
			warning(_("recount: unexpected line: %.*s"),
				(int)linelen(line, size), line);
			return;
		}
		break;
	}
	fragment->oldlines = oldlines;
	fragment->newlines = newlines;
}
 
/*
 * Parse a unified diff fragment header of the
 * form "@@ -a,b +c,d @@"
 */
static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
{
	int offset;
 
	if (!len || line[len-1] != '\n')
		return -1;
 
	/* Figure out the number of lines in a fragment */
	offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
	offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
 
	return offset;
}
 
static int find_header(const char *line, unsigned long size, int *hdrsize, struct patch *patch)
{
	unsigned long offset, len;
 
	patch->is_toplevel_relative = 0;
	patch->is_rename = patch->is_copy = 0;
	patch->is_new = patch->is_delete = -1;
	patch->old_mode = patch->new_mode = 0;
	patch->old_name = patch->new_name = NULL;
	for (offset = 0; size > 0; offset += len, size -= len, line += len, linenr++) {
		unsigned long nextlen;
 
		len = linelen(line, size);
		if (!len)
			break;
 
		/* Testing this early allows us to take a few shortcuts.. */
		if (len < 6)
			continue;
 
		/*
		 * Make sure we don't find any unconnected patch fragments.
		 * That's a sign that we didn't find a header, and that a
		 * patch has become corrupted/broken up.
		 */
		if (!memcmp("@@ -", line, 4)) {
			struct fragment dummy;
			if (parse_fragment_header(line, len, &dummy) < 0)
				continue;
			die(_("patch fragment without header at line %d: %.*s"),
			    linenr, (int)len-1, line);
		}
 
		if (size < len + 6)
			break;
 
		/*
		 * Git patch? It might not have a real patch, just a rename
		 * or mode change, so we handle that specially
		 */
		if (!memcmp("diff --git ", line, 11)) {
			int git_hdr_len = parse_git_header(line, len, size, patch);
			if (git_hdr_len <= len)
				continue;
			if (!patch->old_name && !patch->new_name) {
				if (!patch->def_name)
					die(Q_("git diff header lacks filename information when removing "
					       "%d leading pathname component (line %d)",
					       "git diff header lacks filename information when removing "
					       "%d leading pathname components (line %d)",
					       p_value),
					    p_value, linenr);
				patch->old_name = xstrdup(patch->def_name);
				patch->new_name = xstrdup(patch->def_name);
			}
			if (!patch->is_delete && !patch->new_name)
				die("git diff header lacks filename information "
				    "(line %d)", linenr);
			patch->is_toplevel_relative = 1;
			*hdrsize = git_hdr_len;
			return offset;
		}
 
		/* --- followed by +++ ? */
		if (memcmp("--- ", line,  4) || memcmp("+++ ", line + len, 4))
			continue;
 
		/*
		 * We only accept unified patches, so we want it to
		 * at least have "@@ -a,b +c,d @@\n", which is 14 chars
		 * minimum ("@@ -0,0 +1 @@\n" is the shortest).
		 */
		nextlen = linelen(line + len, size - len);
		if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
			continue;
 
		/* Ok, we'll consider it a patch */
		parse_traditional_patch(line, line+len, patch);
		*hdrsize = len + nextlen;
		linenr += 2;
		return offset;
	}
	return -1;
}
 
static void record_ws_error(unsigned result, const char *line, int len, int linenr)
{
	char *err;
 
	if (!result)
		return;
 
	whitespace_error++;
	if (squelch_whitespace_errors &&
	    squelch_whitespace_errors < whitespace_error)
		return;
 
	err = whitespace_error_string(result);
	fprintf(stderr, "%s:%d: %s.\n%.*s\n",
		patch_input_file, linenr, err, len, line);
	free(err);
}
 
static void check_whitespace(const char *line, int len, unsigned ws_rule)
{
	unsigned result = ws_check(line + 1, len - 1, ws_rule);
 
	record_ws_error(result, line + 1, len - 2, linenr);
}
 
/*
 * Parse a unified diff. Note that this really needs to parse each
 * fragment separately, since the only way to know the difference
 * between a "---" that is part of a patch, and a "---" that starts
 * the next patch is to look at the line counts..
 */
static int parse_fragment(const char *line, unsigned long size,
			  struct patch *patch, struct fragment *fragment)
{
	int added, deleted;
	int len = linelen(line, size), offset;
	unsigned long oldlines, newlines;
	unsigned long leading, trailing;
 
	offset = parse_fragment_header(line, len, fragment);
	if (offset < 0)
		return -1;
	if (offset > 0 && patch->recount)
		recount_diff(line + offset, size - offset, fragment);
	oldlines = fragment->oldlines;
	newlines = fragment->newlines;
	leading = 0;
	trailing = 0;
 
	/* Parse the thing.. */
	line += len;
	size -= len;
	linenr++;
	added = deleted = 0;
	for (offset = len;
	     0 < size;
	     offset += len, size -= len, line += len, linenr++) {
		if (!oldlines && !newlines)
			break;
		len = linelen(line, size);
		if (!len || line[len-1] != '\n')
			return -1;
		switch (*line) {
		default:
			return -1;
		case '\n': /* newer GNU diff, an empty context line */
		case ' ':
			oldlines--;
			newlines--;
			if (!deleted && !added)
				leading++;
			trailing++;
			break;
		case '-':
			if (apply_in_reverse &&
			    ws_error_action != nowarn_ws_error)
				check_whitespace(line, len, patch->ws_rule);
			deleted++;
			oldlines--;
			trailing = 0;
			break;
		case '+':
			if (!apply_in_reverse &&
			    ws_error_action != nowarn_ws_error)
				check_whitespace(line, len, patch->ws_rule);
			added++;
			newlines--;
			trailing = 0;
			break;
 
		/*
		 * We allow "\ No newline at end of file". Depending
                 * on locale settings when the patch was produced we
                 * don't know what this line looks like. The only
                 * thing we do know is that it begins with "\ ".
		 * Checking for 12 is just for sanity check -- any
		 * l10n of "\ No newline..." is at least that long.
		 */
		case '\\':
			if (len < 12 || memcmp(line, "\\ ", 2))
				return -1;
			break;
		}
	}
	if (oldlines || newlines)
		return -1;
	fragment->leading = leading;
	fragment->trailing = trailing;
 
	/*
	 * If a fragment ends with an incomplete line, we failed to include
	 * it in the above loop because we hit oldlines == newlines == 0
	 * before seeing it.
	 */
	if (12 < size && !memcmp(line, "\\ ", 2))
		offset += linelen(line, size);
 
	patch->lines_added += added;
	patch->lines_deleted += deleted;
 
	if (0 < patch->is_new && oldlines)
		return error(_("new file depends on old contents"));
	if (0 < patch->is_delete && newlines)
		return error(_("deleted file still has contents"));
	return offset;
}
 
/*
 * We have seen "diff --git a/... b/..." header (or a traditional patch
 * header).  Read hunks that belong to this patch into fragments and hang
 * them to the given patch structure.
 *
 * The (fragment->patch, fragment->size) pair points into the memory given
 * by the caller, not a copy, when we return.
 */
static int parse_single_patch(const char *line, unsigned long size, struct patch *patch)
{
	unsigned long offset = 0;
	unsigned long oldlines = 0, newlines = 0, context = 0;
	struct fragment **fragp = &patch->fragments;
 
	while (size > 4 && !memcmp(line, "@@ -", 4)) {
		struct fragment *fragment;
		int len;
 
		fragment = xcalloc(1, sizeof(*fragment));
		fragment->linenr = linenr;
		len = parse_fragment(line, size, patch, fragment);
		if (len <= 0)
			die(_("corrupt patch at line %d"), linenr);
		fragment->patch = line;
		fragment->size = len;
		oldlines += fragment->oldlines;
		newlines += fragment->newlines;
		context += fragment->leading + fragment->trailing;
 
		*fragp = fragment;
		fragp = &fragment->next;
 
		offset += len;
		line += len;
		size -= len;
	}
 
	/*
	 * If something was removed (i.e. we have old-lines) it cannot
	 * be creation, and if something was added it cannot be
	 * deletion.  However, the reverse is not true; --unified=0
	 * patches that only add are not necessarily creation even
	 * though they do not have any old lines, and ones that only
	 * delete are not necessarily deletion.
	 *
	 * Unfortunately, a real creation/deletion patch do _not_ have
	 * any context line by definition, so we cannot safely tell it
	 * apart with --unified=0 insanity.  At least if the patch has
	 * more than one hunk it is not creation or deletion.
	 */
	if (patch->is_new < 0 &&
	    (oldlines || (patch->fragments && patch->fragments->next)))
		patch->is_new = 0;
	if (patch->is_delete < 0 &&
	    (newlines || (patch->fragments && patch->fragments->next)))
		patch->is_delete = 0;
 
	if (0 < patch->is_new && oldlines)
		die(_("new file %s depends on old contents"), patch->new_name);
	if (0 < patch->is_delete && newlines)
		die(_("deleted file %s still has contents"), patch->old_name);
	if (!patch->is_delete && !newlines && context)
		fprintf_ln(stderr,
			   _("** warning: "
			     "file %s becomes empty but is not deleted"),
			   patch->new_name);
 
	return offset;
}
 
static inline int metadata_changes(struct patch *patch)
{
	return	patch->is_rename > 0 ||
		patch->is_copy > 0 ||
		patch->is_new > 0 ||
		patch->is_delete ||
		(patch->old_mode && patch->new_mode &&
		 patch->old_mode != patch->new_mode);
}
 
static char *inflate_it(const void *data, unsigned long size,
			unsigned long inflated_size)
{
	git_zstream stream;
	void *out;
	int st;
 
	memset(&stream, 0, sizeof(stream));
 
	stream.next_in = (unsigned char *)data;
	stream.avail_in = size;
	stream.next_out = out = xmalloc(inflated_size);
	stream.avail_out = inflated_size;
	git_inflate_init(&stream);
	st = git_inflate(&stream, Z_FINISH);
	git_inflate_end(&stream);
	if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
		free(out);
		return NULL;
	}
	return out;
}
 
/*
 * Read a binary hunk and return a new fragment; fragment->patch
 * points at an allocated memory that the caller must free, so
 * it is marked as "->free_patch = 1".
 */
static struct fragment *parse_binary_hunk(char **buf_p,
					  unsigned long *sz_p,
					  int *status_p,
					  int *used_p)
{
	/*
	 * Expect a line that begins with binary patch method ("literal"
	 * or "delta"), followed by the length of data before deflating.
	 * a sequence of 'length-byte' followed by base-85 encoded data
	 * should follow, terminated by a newline.
	 *
	 * Each 5-byte sequence of base-85 encodes up to 4 bytes,
	 * and we would limit the patch line to 66 characters,
	 * so one line can fit up to 13 groups that would decode
	 * to 52 bytes max.  The length byte 'A'-'Z' corresponds
	 * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
	 */
	int llen, used;
	unsigned long size = *sz_p;
	char *buffer = *buf_p;
	int patch_method;
	unsigned long origlen;
	char *data = NULL;
	int hunk_size = 0;
	struct fragment *frag;
 
	llen = linelen(buffer, size);
	used = llen;
 
	*status_p = 0;
 
	if (starts_with(buffer, "delta ")) {
		patch_method = BINARY_DELTA_DEFLATED;
		origlen = strtoul(buffer + 6, NULL, 10);
	}
	else if (starts_with(buffer, "literal ")) {
		patch_method = BINARY_LITERAL_DEFLATED;
		origlen = strtoul(buffer + 8, NULL, 10);
	}
	else
		return NULL;
 
	linenr++;
	buffer += llen;
	while (1) {
		int byte_length, max_byte_length, newsize;
		llen = linelen(buffer, size);
		used += llen;
		linenr++;
		if (llen == 1) {
			/* consume the blank line */
			buffer++;
			size--;
			break;
		}
		/*
		 * Minimum line is "A00000\n" which is 7-byte long,
		 * and the line length must be multiple of 5 plus 2.
		 */
		if ((llen < 7) || (llen-2) % 5)
			goto corrupt;
		max_byte_length = (llen - 2) / 5 * 4;
		byte_length = *buffer;
		if ('A' <= byte_length && byte_length <= 'Z')
			byte_length = byte_length - 'A' + 1;
		else if ('a' <= byte_length && byte_length <= 'z')
			byte_length = byte_length - 'a' + 27;
		else
			goto corrupt;
		/* if the input length was not multiple of 4, we would
		 * have filler at the end but the filler should never
		 * exceed 3 bytes
		 */
		if (max_byte_length < byte_length ||
		    byte_length <= max_byte_length - 4)
			goto corrupt;
		newsize = hunk_size + byte_length;
		data = xrealloc(data, newsize);
		if (decode_85(data + hunk_size, buffer + 1, byte_length))
			goto corrupt;
		hunk_size = newsize;
		buffer += llen;
		size -= llen;
	}
 
	frag = xcalloc(1, sizeof(*frag));
	frag->patch = inflate_it(data, hunk_size, origlen);
	frag->free_patch = 1;
	if (!frag->patch)
		goto corrupt;
	free(data);
	frag->size = origlen;
	*buf_p = buffer;
	*sz_p = size;
	*used_p = used;
	frag->binary_patch_method = patch_method;
	return frag;
 
 corrupt:
	free(data);
	*status_p = -1;
	error(_("corrupt binary patch at line %d: %.*s"),
	      linenr-1, llen-1, buffer);
	return NULL;
}
 
static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
{
	/*
	 * We have read "GIT binary patch\n"; what follows is a line
	 * that says the patch method (currently, either "literal" or
	 * "delta") and the length of data before deflating; a
	 * sequence of 'length-byte' followed by base-85 encoded data
	 * follows.
	 *
	 * When a binary patch is reversible, there is another binary
	 * hunk in the same format, starting with patch method (either
	 * "literal" or "delta") with the length of data, and a sequence
	 * of length-byte + base-85 encoded data, terminated with another
	 * empty line.  This data, when applied to the postimage, produces
	 * the preimage.
	 */
	struct fragment *forward;
	struct fragment *reverse;
	int status;
	int used, used_1;
 
	forward = parse_binary_hunk(&buffer, &size, &status, &used);
	if (!forward && !status)
		/* there has to be one hunk (forward hunk) */
		return error(_("unrecognized binary patch at line %d"), linenr-1);
	if (status)
		/* otherwise we already gave an error message */
		return status;
 
	reverse = parse_binary_hunk(&buffer, &size, &status, &used_1);
	if (reverse)
		used += used_1;
	else if (status) {
		/*
		 * Not having reverse hunk is not an error, but having
		 * a corrupt reverse hunk is.
		 */
		free((void*) forward->patch);
		free(forward);
		return status;
	}
	forward->next = reverse;
	patch->fragments = forward;
	patch->is_binary = 1;
	return used;
}
 
static void prefix_one(char **name)
{
	char *old_name = *name;
	if (!old_name)
		return;
	*name = xstrdup(prefix_filename(prefix, prefix_length, *name));
	free(old_name);
}
 
static void prefix_patch(struct patch *p)
{
	if (!prefix || p->is_toplevel_relative)
		return;
	prefix_one(&p->new_name);
	prefix_one(&p->old_name);
}
 
/*
 * include/exclude
 */
 
static struct string_list limit_by_name;
static int has_include;
static void add_name_limit(const char *name, int exclude)
{
	struct string_list_item *it;
 
	it = string_list_append(&limit_by_name, name);
	it->util = exclude ? NULL : (void *) 1;
}
 
static int use_patch(struct patch *p)
{
	const char *pathname = p->new_name ? p->new_name : p->old_name;
	int i;
 
	/* Paths outside are not touched regardless of "--include" */
	if (0 < prefix_length) {
		int pathlen = strlen(pathname);
		if (pathlen <= prefix_length ||
		    memcmp(prefix, pathname, prefix_length))
			return 0;
	}
 
	/* See if it matches any of exclude/include rule */
	for (i = 0; i < limit_by_name.nr; i++) {
		struct string_list_item *it = &limit_by_name.items[i];
		if (!wildmatch(it->string, pathname, 0, NULL))
			return (it->util != NULL);
	}
 
	/*
	 * If we had any include, a path that does not match any rule is
	 * not used.  Otherwise, we saw bunch of exclude rules (or none)
	 * and such a path is used.
	 */
	return !has_include;
}
 
 
/*
 * Read the patch text in "buffer" that extends for "size" bytes; stop
 * reading after seeing a single patch (i.e. changes to a single file).
 * Create fragments (i.e. patch hunks) and hang them to the given patch.
 * Return the number of bytes consumed, so that the caller can call us
 * again for the next patch.
 */
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
	int hdrsize, patchsize;
	int offset = find_header(buffer, size, &hdrsize, patch);
 
	if (offset < 0)
		return offset;
 
	prefix_patch(patch);
 
	if (!use_patch(patch))
		patch->ws_rule = 0;
	else
		patch->ws_rule = whitespace_rule(patch->new_name
						 ? patch->new_name
						 : patch->old_name);
 
	patchsize = parse_single_patch(buffer + offset + hdrsize,
				       size - offset - hdrsize, patch);
 
	if (!patchsize) {
		static const char git_binary[] = "GIT binary patch\n";
		int hd = hdrsize + offset;
		unsigned long llen = linelen(buffer + hd, size - hd);
 
		if (llen == sizeof(git_binary) - 1 &&
		    !memcmp(git_binary, buffer + hd, llen)) {
			int used;
			linenr++;
			used = parse_binary(buffer + hd + llen,
					    size - hd - llen, patch);
			if (used)
				patchsize = used + llen;
			else
				patchsize = 0;
		}
		else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
			static const char *binhdr[] = {
				"Binary files ",
				"Files ",
				NULL,
			};
			int i;
			for (i = 0; binhdr[i]; i++) {
				int len = strlen(binhdr[i]);
				if (len < size - hd &&
				    !memcmp(binhdr[i], buffer + hd, len)) {
					linenr++;
					patch->is_binary = 1;
					patchsize = llen;
					break;
				}
			}
		}
 
		/* Empty patch cannot be applied if it is a text patch
		 * without metadata change.  A binary patch appears
		 * empty to us here.
		 */
		if ((apply || check) &&
		    (!patch->is_binary && !metadata_changes(patch)))
			die(_("patch with only garbage at line %d"), linenr);
	}
 
	return offset + hdrsize + patchsize;
}
 
#define swap(a,b) myswap((a),(b),sizeof(a))
 
#define myswap(a, b, size) do {		\
	unsigned char mytmp[size];	\
	memcpy(mytmp, &a, size);		\
	memcpy(&a, &b, size);		\
	memcpy(&b, mytmp, size);		\
} while (0)
 
static void reverse_patches(struct patch *p)
{
	for (; p; p = p->next) {
		struct fragment *frag = p->fragments;
 
		swap(p->new_name, p->old_name);
		swap(p->new_mode, p->old_mode);
		swap(p->is_new, p->is_delete);
		swap(p->lines_added, p->lines_deleted);
		swap(p->old_sha1_prefix, p->new_sha1_prefix);
 
		for (; frag; frag = frag->next) {
			swap(frag->newpos, frag->oldpos);
			swap(frag->newlines, frag->oldlines);
		}
	}
}
 
static const char pluses[] =
"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
static const char minuses[]=
"----------------------------------------------------------------------";
 
static void show_stats(struct patch *patch)
{
	struct strbuf qname = STRBUF_INIT;
	char *cp = patch->new_name ? patch->new_name : patch->old_name;
	int max, add, del;
 
	quote_c_style(cp, &qname, NULL, 0);
 
	/*
	 * "scale" the filename
	 */
	max = max_len;
	if (max > 50)
		max = 50;
 
	if (qname.len > max) {
		cp = strchr(qname.buf + qname.len + 3 - max, '/');
		if (!cp)
			cp = qname.buf + qname.len + 3 - max;
		strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
	}
 
	if (patch->is_binary) {
		printf(" %-*s |  Bin\n", max, qname.buf);
		strbuf_release(&qname);
		return;
	}
 
	printf(" %-*s |", max, qname.buf);
	strbuf_release(&qname);
 
	/*
	 * scale the add/delete
	 */
	max = max + max_change > 70 ? 70 - max : max_change;
	add = patch->lines_added;
	del = patch->lines_deleted;
 
	if (max_change > 0) {
		int total = ((add + del) * max + max_change / 2) / max_change;
		add = (add * max + max_change / 2) / max_change;
		del = total - add;
	}
	printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
		add, pluses, del, minuses);
}
 
static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
{
	switch (st->st_mode & S_IFMT) {
	case S_IFLNK:
		if (strbuf_readlink(buf, path, st->st_size) < 0)
			return error(_("unable to read symlink %s"), path);
		return 0;
	case S_IFREG:
		if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
			return error(_("unable to open or read %s"), path);
		convert_to_git(path, buf->buf, buf->len, buf, 0);
		return 0;
	default:
		return -1;
	}
}
 
/*
 * Update the preimage, and the common lines in postimage,
 * from buffer buf of length len. If postlen is 0 the postimage
 * is updated in place, otherwise it's updated on a new buffer
 * of length postlen
 */
 
static void update_pre_post_images(struct image *preimage,
				   struct image *postimage,
				   char *buf,
				   size_t len, size_t postlen)
{
	int i, ctx, reduced;
	char *new, *old, *fixed;
	struct image fixed_preimage;
 
	/*
	 * Update the preimage with whitespace fixes.  Note that we
	 * are not losing preimage->buf -- apply_one_fragment() will
	 * free "oldlines".
	 */
	prepare_image(&fixed_preimage, buf, len, 1);
	assert(postlen
	       ? fixed_preimage.nr == preimage->nr
	       : fixed_preimage.nr <= preimage->nr);
	for (i = 0; i < fixed_preimage.nr; i++)
		fixed_preimage.line[i].flag = preimage->line[i].flag;
	free(preimage->line_allocated);
	*preimage = fixed_preimage;
 
	/*
	 * Adjust the common context lines in postimage. This can be
	 * done in-place when we are shrinking it with whitespace
	 * fixing, but needs a new buffer when ignoring whitespace or
	 * expanding leading tabs to spaces.
	 *
	 * We trust the caller to tell us if the update can be done
	 * in place (postlen==0) or not.
	 */
	old = postimage->buf;
	if (postlen)
		new = postimage->buf = xmalloc(postlen);
	else
		new = old;
	fixed = preimage->buf;
 
	for (i = reduced = ctx = 0; i < postimage->nr; i++) {
		size_t len = postimage->line[i].len;
		if (!(postimage->line[i].flag & LINE_COMMON)) {
			/* an added line -- no counterparts in preimage */
			memmove(new, old, len);
			old += len;
			new += len;
			continue;
		}
 
		/* a common context -- skip it in the original postimage */
		old += len;
 
		/* and find the corresponding one in the fixed preimage */
		while (ctx < preimage->nr &&
		       !(preimage->line[ctx].flag & LINE_COMMON)) {
			fixed += preimage->line[ctx].len;
			ctx++;
		}
 
		/*
		 * preimage is expected to run out, if the caller
		 * fixed addition of trailing blank lines.
		 */
		if (preimage->nr <= ctx) {
			reduced++;
			continue;
		}
 
		/* and copy it in, while fixing the line length */
		len = preimage->line[ctx].len;
		memcpy(new, fixed, len);
		new += len;
		fixed += len;
		postimage->line[i].len = len;
		ctx++;
	}
 
	/* Fix the length of the whole thing */
	postimage->len = new - postimage->buf;
	postimage->nr -= reduced;
}
 
static int match_fragment(struct image *img,
			  struct image *preimage,
			  struct image *postimage,
			  unsigned long try,
			  int try_lno,
			  unsigned ws_rule,
			  int match_beginning, int match_end)
{
	int i;
	char *fixed_buf, *buf, *orig, *target;
	struct strbuf fixed;
	size_t fixed_len, postlen;
	int preimage_limit;
 
	if (preimage->nr + try_lno <= img->nr) {
		/*
		 * The hunk falls within the boundaries of img.
		 */
		preimage_limit = preimage->nr;
		if (match_end && (preimage->nr + try_lno != img->nr))
			return 0;
	} else if (ws_error_action == correct_ws_error &&
		   (ws_rule & WS_BLANK_AT_EOF)) {
		/*
		 * This hunk extends beyond the end of img, and we are
		 * removing blank lines at the end of the file.  This
		 * many lines from the beginning of the preimage must
		 * match with img, and the remainder of the preimage
		 * must be blank.
		 */
		preimage_limit = img->nr - try_lno;
	} else {
		/*
		 * The hunk extends beyond the end of the img and
		 * we are not removing blanks at the end, so we
		 * should reject the hunk at this position.
		 */
		return 0;
	}
 
	if (match_beginning && try_lno)
		return 0;
 
	/* Quick hash check */
	for (i = 0; i < preimage_limit; i++)
		if ((img->line[try_lno + i].flag & LINE_PATCHED) ||
		    (preimage->line[i].hash != img->line[try_lno + i].hash))
			return 0;
 
	if (preimage_limit == preimage->nr) {
		/*
		 * Do we have an exact match?  If we were told to match
		 * at the end, size must be exactly at try+fragsize,
		 * otherwise try+fragsize must be still within the preimage,
		 * and either case, the old piece should match the preimage
		 * exactly.
		 */
		if ((match_end
		     ? (try + preimage->len == img->len)
		     : (try + preimage->len <= img->len)) &&
		    !memcmp(img->buf + try, preimage->buf, preimage->len))
			return 1;
	} else {
		/*
		 * The preimage extends beyond the end of img, so
		 * there cannot be an exact match.
		 *
		 * There must be one non-blank context line that match
		 * a line before the end of img.
		 */
		char *buf_end;
 
		buf = preimage->buf;
		buf_end = buf;
		for (i = 0; i < preimage_limit; i++)
			buf_end += preimage->line[i].len;
 
		for ( ; buf < buf_end; buf++)
			if (!isspace(*buf))
				break;
		if (buf == buf_end)
			return 0;
	}
 
	/*
	 * No exact match. If we are ignoring whitespace, run a line-by-line
	 * fuzzy matching. We collect all the line length information because
	 * we need it to adjust whitespace if we match.
	 */
	if (ws_ignore_action == ignore_ws_change) {
		size_t imgoff = 0;
		size_t preoff = 0;
		size_t postlen = postimage->len;
		size_t extra_chars;
		char *preimage_eof;
		char *preimage_end;
		for (i = 0; i < preimage_limit; i++) {
			size_t prelen = preimage->line[i].len;
			size_t imglen = img->line[try_lno+i].len;
 
			if (!fuzzy_matchlines(img->buf + try + imgoff, imglen,
					      preimage->buf + preoff, prelen))
				return 0;
			if (preimage->line[i].flag & LINE_COMMON)
				postlen += imglen - prelen;
			imgoff += imglen;
			preoff += prelen;
		}
 
		/*
		 * Ok, the preimage matches with whitespace fuzz.
		 *
		 * imgoff now holds the true length of the target that
		 * matches the preimage before the end of the file.
		 *
		 * Count the number of characters in the preimage that fall
		 * beyond the end of the file and make sure that all of them
		 * are whitespace characters. (This can only happen if
		 * we are removing blank lines at the end of the file.)
		 */
		buf = preimage_eof = preimage->buf + preoff;
		for ( ; i < preimage->nr; i++)
			preoff += preimage->line[i].len;
		preimage_end = preimage->buf + preoff;
		for ( ; buf < preimage_end; buf++)
			if (!isspace(*buf))
				return 0;
 
		/*
		 * Update the preimage and the common postimage context
		 * lines to use the same whitespace as the target.
		 * If whitespace is missing in the target (i.e.
		 * if the preimage extends beyond the end of the file),
		 * use the whitespace from the preimage.
		 */
		extra_chars = preimage_end - preimage_eof;
		strbuf_init(&fixed, imgoff + extra_chars);
		strbuf_add(&fixed, img->buf + try, imgoff);
		strbuf_add(&fixed, preimage_eof, extra_chars);
		fixed_buf = strbuf_detach(&fixed, &fixed_len);
		update_pre_post_images(preimage, postimage,
				fixed_buf, fixed_len, postlen);
		return 1;
	}
 
	if (ws_error_action != correct_ws_error)
		return 0;
 
	/*
	 * The hunk does not apply byte-by-byte, but the hash says
	 * it might with whitespace fuzz. We haven't been asked to
	 * ignore whitespace, we were asked to correct whitespace
	 * errors, so let's try matching after whitespace correction.
	 *
	 * The preimage may extend beyond the end of the file,
	 * but in this loop we will only handle the part of the
	 * preimage that falls within the file.
	 */
	strbuf_init(&fixed, preimage->len + 1);
	orig = preimage->buf;
	target = img->buf + try;
	postlen = 0;
	for (i = 0; i < preimage_limit; i++) {
		size_t oldlen = preimage->line[i].len;
		size_t tgtlen = img->line[try_lno + i].len;
		size_t fixstart = fixed.len;
		struct strbuf tgtfix;
		int match;
 
		/* Try fixing the line in the preimage */
		ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
 
		/* Try fixing the line in the target */
		strbuf_init(&tgtfix, tgtlen);
		ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL);
 
		/*
		 * If they match, either the preimage was based on
		 * a version before our tree fixed whitespace breakage,
		 * or we are lacking a whitespace-fix patch the tree
		 * the preimage was based on already had (i.e. target
		 * has whitespace breakage, the preimage doesn't).
		 * In either case, we are fixing the whitespace breakages
		 * so we might as well take the fix together with their
		 * real change.
		 */
		match = (tgtfix.len == fixed.len - fixstart &&
			 !memcmp(tgtfix.buf, fixed.buf + fixstart,
					     fixed.len - fixstart));
		postlen += tgtfix.len;
 
		strbuf_release(&tgtfix);
		if (!match)
			goto unmatch_exit;
 
		orig += oldlen;
		target += tgtlen;
	}
 
 
	/*
	 * Now handle the lines in the preimage that falls beyond the
	 * end of the file (if any). They will only match if they are
	 * empty or only contain whitespace (if WS_BLANK_AT_EOL is
	 * false).
	 */
	for ( ; i < preimage->nr; i++) {
		size_t fixstart = fixed.len; /* start of the fixed preimage */
		size_t oldlen = preimage->line[i].len;
		int j;
 
		/* Try fixing the line in the preimage */
		ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
 
		for (j = fixstart; j < fixed.len; j++)
			if (!isspace(fixed.buf[j]))
				goto unmatch_exit;
 
		orig += oldlen;
	}
 
	/*
	 * Yes, the preimage is based on an older version that still
	 * has whitespace breakages unfixed, and fixing them makes the
	 * hunk match.  Update the context lines in the postimage.
	 */
	fixed_buf = strbuf_detach(&fixed, &fixed_len);
	if (postlen < postimage->len)
		postlen = 0;
	update_pre_post_images(preimage, postimage,
			       fixed_buf, fixed_len, postlen);
	return 1;
 
 unmatch_exit:
	strbuf_release(&fixed);
	return 0;
}
 
static int find_pos(struct image *img,
		    struct image *preimage,
		    struct image *postimage,
		    int line,
		    unsigned ws_rule,
		    int match_beginning, int match_end)
{
	int i;
	unsigned long backwards, forwards, try;
	int backwards_lno, forwards_lno, try_lno;
 
	/*
	 * If match_beginning or match_end is specified, there is no
	 * point starting from a wrong line that will never match and
	 * wander around and wait for a match at the specified end.
	 */
	if (match_beginning)
		line = 0;
	else if (match_end)
		line = img->nr - preimage->nr;
 
	/*
	 * Because the comparison is unsigned, the following test
	 * will also take care of a negative line number that can
	 * result when match_end and preimage is larger than the target.
	 */
	if ((size_t) line > img->nr)
		line = img->nr;
 
	try = 0;
	for (i = 0; i < line; i++)
		try += img->line[i].len;
 
	/*
	 * There's probably some smart way to do this, but I'll leave
	 * that to the smart and beautiful people. I'm simple and stupid.
	 */
	backwards = try;
	backwards_lno = line;
	forwards = try;
	forwards_lno = line;
	try_lno = line;
 
	for (i = 0; ; i++) {
		if (match_fragment(img, preimage, postimage,
				   try, try_lno, ws_rule,
				   match_beginning, match_end))
			return try_lno;
 
	again:
		if (backwards_lno == 0 && forwards_lno == img->nr)
			break;
 
		if (i & 1) {
			if (backwards_lno == 0) {
				i++;
				goto again;
			}
			backwards_lno--;
			backwards -= img->line[backwards_lno].len;
			try = backwards;
			try_lno = backwards_lno;
		} else {
			if (forwards_lno == img->nr) {
				i++;
				goto again;
			}
			forwards += img->line[forwards_lno].len;
			forwards_lno++;
			try = forwards;
			try_lno = forwards_lno;
		}
 
	}
	return -1;
}
 
static void remove_first_line(struct image *img)
{
	img->buf += img->line[0].len;
	img->len -= img->line[0].len;
	img->line++;
	img->nr--;
}
 
static void remove_last_line(struct image *img)
{
	img->len -= img->line[--img->nr].len;
}
 
/*
 * The change from "preimage" and "postimage" has been found to
 * apply at applied_pos (counts in line numbers) in "img".
 * Update "img" to remove "preimage" and replace it with "postimage".
 */
static void update_image(struct image *img,
			 int applied_pos,
			 struct image *preimage,
			 struct image *postimage)
{
	/*
	 * remove the copy of preimage at offset in img
	 * and replace it with postimage
	 */
	int i, nr;
	size_t remove_count, insert_count, applied_at = 0;
	char *result;
	int preimage_limit;
 
	/*
	 * If we are removing blank lines at the end of img,
	 * the preimage may extend beyond the end.
	 * If that is the case, we must be careful only to
	 * remove the part of the preimage that falls within
	 * the boundaries of img. Initialize preimage_limit
	 * to the number of lines in the preimage that falls
	 * within the boundaries.
	 */
	preimage_limit = preimage->nr;
	if (preimage_limit > img->nr - applied_pos)
		preimage_limit = img->nr - applied_pos;
 
	for (i = 0; i < applied_pos; i++)
		applied_at += img->line[i].len;
 
	remove_count = 0;
	for (i = 0; i < preimage_limit; i++)
		remove_count += img->line[applied_pos + i].len;
	insert_count = postimage->len;
 
	/* Adjust the contents */
	result = xmalloc(img->len + insert_count - remove_count + 1);
	memcpy(result, img->buf, applied_at);
	memcpy(result + applied_at, postimage->buf, postimage->len);
	memcpy(result + applied_at + postimage->len,
	       img->buf + (applied_at + remove_count),
	       img->len - (applied_at + remove_count));
	free(img->buf);
	img->buf = result;
	img->len += insert_count - remove_count;
	result[img->len] = '\0';
 
	/* Adjust the line table */
	nr = img->nr + postimage->nr - preimage_limit;
	if (preimage_limit < postimage->nr) {
		/*
		 * NOTE: this knows that we never call remove_first_line()
		 * on anything other than pre/post image.
		 */
		REALLOC_ARRAY(img->line, nr);
		img->line_allocated = img->line;
	}
	if (preimage_limit != postimage->nr)
		memmove(img->line + applied_pos + postimage->nr,
			img->line + applied_pos + preimage_limit,
			(img->nr - (applied_pos + preimage_limit)) *
			sizeof(*img->line));
	memcpy(img->line + applied_pos,
	       postimage->line,
	       postimage->nr * sizeof(*img->line));
	if (!allow_overlap)
		for (i = 0; i < postimage->nr; i++)
			img->line[applied_pos + i].flag |= LINE_PATCHED;
	img->nr = nr;
}
 
/*
 * Use the patch-hunk text in "frag" to prepare two images (preimage and
 * postimage) for the hunk.  Find lines that match "preimage" in "img" and
 * replace the part of "img" with "postimage" text.
 */
static int apply_one_fragment(struct image *img, struct fragment *frag,
			      int inaccurate_eof, unsigned ws_rule,
			      int nth_fragment)
{
	int match_beginning, match_end;
	const char *patch = frag->patch;
	int size = frag->size;
	char *old, *oldlines;
	struct strbuf newlines;
	int new_blank_lines_at_end = 0;
	int found_new_blank_lines_at_end = 0;
	int hunk_linenr = frag->linenr;
	unsigned long leading, trailing;
	int pos, applied_pos;
	struct image preimage;
	struct image postimage;
 
	memset(&preimage, 0, sizeof(preimage));
	memset(&postimage, 0, sizeof(postimage));
	oldlines = xmalloc(size);
	strbuf_init(&newlines, size);
 
	old = oldlines;
	while (size > 0) {
		char first;
		int len = linelen(patch, size);
		int plen;
		int added_blank_line = 0;
		int is_blank_context = 0;
		size_t start;
 
		if (!len)
			break;
 
		/*
		 * "plen" is how much of the line we should use for
		 * the actual patch data. Normally we just remove the
		 * first character on the line, but if the line is
		 * followed by "\ No newline", then we also remove the
		 * last one (which is the newline, of course).
		 */
		plen = len - 1;
		if (len < size && patch[len] == '\\')
			plen--;
		first = *patch;
		if (apply_in_reverse) {
			if (first == '-')
				first = '+';
			else if (first == '+')
				first = '-';
		}
 
		switch (first) {
		case '\n':
			/* Newer GNU diff, empty context line */
			if (plen < 0)
				/* ... followed by '\No newline'; nothing */
				break;
			*old++ = '\n';
			strbuf_addch(&newlines, '\n');
			add_line_info(&preimage, "\n", 1, LINE_COMMON);
			add_line_info(&postimage, "\n", 1, LINE_COMMON);
			is_blank_context = 1;
			break;
		case ' ':
			if (plen && (ws_rule & WS_BLANK_AT_EOF) &&
			    ws_blank_line(patch + 1, plen, ws_rule))
				is_blank_context = 1;
		case '-':
			memcpy(old, patch + 1, plen);
			add_line_info(&preimage, old, plen,
				      (first == ' ' ? LINE_COMMON : 0));
			old += plen;
			if (first == '-')
				break;
		/* Fall-through for ' ' */
		case '+':
			/* --no-add does not add new lines */
			if (first == '+' && no_add)
				break;
 
			start = newlines.len;
			if (first != '+' ||
			    !whitespace_error ||
			    ws_error_action != correct_ws_error) {
				strbuf_add(&newlines, patch + 1, plen);
			}
			else {
				ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &applied_after_fixing_ws);
			}
			add_line_info(&postimage, newlines.buf + start, newlines.len - start,
				      (first == '+' ? 0 : LINE_COMMON));
			if (first == '+' &&
			    (ws_rule & WS_BLANK_AT_EOF) &&
			    ws_blank_line(patch + 1, plen, ws_rule))
				added_blank_line = 1;
			break;
		case '@': case '\\':
			/* Ignore it, we already handled it */
			break;
		default:
			if (apply_verbosely)
				error(_("invalid start of line: '%c'"), first);
			return -1;
		}
		if (added_blank_line) {
			if (!new_blank_lines_at_end)
				found_new_blank_lines_at_end = hunk_linenr;
			new_blank_lines_at_end++;
		}
		else if (is_blank_context)
			;
		else
			new_blank_lines_at_end = 0;
		patch += len;
		size -= len;
		hunk_linenr++;
	}
	if (inaccurate_eof &&
	    old > oldlines && old[-1] == '\n' &&
	    newlines.len > 0 && newlines.buf[newlines.len - 1] == '\n') {
		old--;
		strbuf_setlen(&newlines, newlines.len - 1);
	}
 
	leading = frag->leading;
	trailing = frag->trailing;
 
	/*
	 * A hunk to change lines at the beginning would begin with
	 * @@ -1,L +N,M @@
	 * but we need to be careful.  -U0 that inserts before the second
	 * line also has this pattern.
	 *
	 * And a hunk to add to an empty file would begin with
	 * @@ -0,0 +N,M @@
	 *
	 * In other words, a hunk that is (frag->oldpos <= 1) with or
	 * without leading context must match at the beginning.
	 */
	match_beginning = (!frag->oldpos ||
			   (frag->oldpos == 1 && !unidiff_zero));
 
	/*
	 * A hunk without trailing lines must match at the end.
	 * However, we simply cannot tell if a hunk must match end
	 * from the lack of trailing lines if the patch was generated
	 * with unidiff without any context.
	 */
	match_end = !unidiff_zero && !trailing;
 
	pos = frag->newpos ? (frag->newpos - 1) : 0;
	preimage.buf = oldlines;
	preimage.len = old - oldlines;
	postimage.buf = newlines.buf;
	postimage.len = newlines.len;
	preimage.line = preimage.line_allocated;
	postimage.line = postimage.line_allocated;
 
	for (;;) {
 
		applied_pos = find_pos(img, &preimage, &postimage, pos,
				       ws_rule, match_beginning, match_end);
 
		if (applied_pos >= 0)
			break;
 
		/* Am I at my context limits? */
		if ((leading <= p_context) && (trailing <= p_context))
			break;
		if (match_beginning || match_end) {
			match_beginning = match_end = 0;
			continue;
		}
 
		/*
		 * Reduce the number of context lines; reduce both
		 * leading and trailing if they are equal otherwise
		 * just reduce the larger context.
		 */
		if (leading >= trailing) {
			remove_first_line(&preimage);
			remove_first_line(&postimage);
			pos--;
			leading--;
		}
		if (trailing > leading) {
			remove_last_line(&preimage);
			remove_last_line(&postimage);
			trailing--;
		}
	}
 
	if (applied_pos >= 0) {
		if (new_blank_lines_at_end &&
		    preimage.nr + applied_pos >= img->nr &&
		    (ws_rule & WS_BLANK_AT_EOF) &&
		    ws_error_action != nowarn_ws_error) {
			record_ws_error(WS_BLANK_AT_EOF, "+", 1,
					found_new_blank_lines_at_end);
			if (ws_error_action == correct_ws_error) {
				while (new_blank_lines_at_end--)
					remove_last_line(&postimage);
			}
			/*
			 * We would want to prevent write_out_results()
			 * from taking place in apply_patch() that follows
			 * the callchain led us here, which is:
			 * apply_patch->check_patch_list->check_patch->
			 * apply_data->apply_fragments->apply_one_fragment
			 */
			if (ws_error_action == die_on_ws_error)
				apply = 0;
		}
 
		if (apply_verbosely && applied_pos != pos) {
			int offset = applied_pos - pos;
			if (apply_in_reverse)
				offset = 0 - offset;
			fprintf_ln(stderr,
				   Q_("Hunk #%d succeeded at %d (offset %d line).",
				      "Hunk #%d succeeded at %d (offset %d lines).",
				      offset),
				   nth_fragment, applied_pos + 1, offset);
		}
 
		/*
		 * Warn if it was necessary to reduce the number
		 * of context lines.
		 */
		if ((leading != frag->leading) ||
		    (trailing != frag->trailing))
			fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
					     " to apply fragment at %d"),
				   leading, trailing, applied_pos+1);
		update_image(img, applied_pos, &preimage, &postimage);
	} else {
		if (apply_verbosely)
			error(_("while searching for:\n%.*s"),
			      (int)(old - oldlines), oldlines);
	}
 
	free(oldlines);
	strbuf_release(&newlines);
	free(preimage.line_allocated);
	free(postimage.line_allocated);
 
	return (applied_pos < 0);
}
 
static int apply_binary_fragment(struct image *img, struct patch *patch)
{
	struct fragment *fragment = patch->fragments;
	unsigned long len;
	void *dst;
 
	if (!fragment)
		return error(_("missing binary patch data for '%s'"),
			     patch->new_name ?
			     patch->new_name :
			     patch->old_name);
 
	/* Binary patch is irreversible without the optional second hunk */
	if (apply_in_reverse) {
		if (!fragment->next)
			return error("cannot reverse-apply a binary patch "
				     "without the reverse hunk to '%s'",
				     patch->new_name
				     ? patch->new_name : patch->old_name);
		fragment = fragment->next;
	}
	switch (fragment->binary_patch_method) {
	case BINARY_DELTA_DEFLATED:
		dst = patch_delta(img->buf, img->len, fragment->patch,
				  fragment->size, &len);
		if (!dst)
			return -1;
		clear_image(img);
		img->buf = dst;
		img->len = len;
		return 0;
	case BINARY_LITERAL_DEFLATED:
		clear_image(img);
		img->len = fragment->size;
		img->buf = xmemdupz(fragment->patch, img->len);
		return 0;
	}
	return -1;
}
 
/*
 * Replace "img" with the result of applying the binary patch.
 * The binary patch data itself in patch->fragment is still kept
 * but the preimage prepared by the caller in "img" is freed here
 * or in the helper function apply_binary_fragment() this calls.
 */
static int apply_binary(struct image *img, struct patch *patch)
{
	const char *name = patch->old_name ? patch->old_name : patch->new_name;
	unsigned char sha1[20];
 
	/*
	 * For safety, we require patch index line to contain
	 * full 40-byte textual SHA1 for old and new, at least for now.
	 */
	if (strlen(patch->old_sha1_prefix) != 40 ||
	    strlen(patch->new_sha1_prefix) != 40 ||
	    get_sha1_hex(patch->old_sha1_prefix, sha1) ||
	    get_sha1_hex(patch->new_sha1_prefix, sha1))
		return error("cannot apply binary patch to '%s' "
			     "without full index line", name);
 
	if (patch->old_name) {
		/*
		 * See if the old one matches what the patch
		 * applies to.
		 */
		hash_sha1_file(img->buf, img->len, blob_type, sha1);
		if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
			return error("the patch applies to '%s' (%s), "
				     "which does not match the "
				     "current contents.",
				     name, sha1_to_hex(sha1));
	}
	else {
		/* Otherwise, the old one must be empty. */
		if (img->len)
			return error("the patch applies to an empty "
				     "'%s' but it is not empty", name);
	}
 
	get_sha1_hex(patch->new_sha1_prefix, sha1);
	if (is_null_sha1(sha1)) {
		clear_image(img);
		return 0; /* deletion patch */
	}
 
	if (has_sha1_file(sha1)) {
		/* We already have the postimage */
		enum object_type type;
		unsigned long size;
		char *result;
 
		result = read_sha1_file(sha1, &type, &size);
		if (!result)
			return error("the necessary postimage %s for "
				     "'%s' cannot be read",
				     patch->new_sha1_prefix, name);
		clear_image(img);
		img->buf = result;
		img->len = size;
	} else {
		/*
		 * We have verified buf matches the preimage;
		 * apply the patch data to it, which is stored
		 * in the patch->fragments->{patch,size}.
		 */
		if (apply_binary_fragment(img, patch))
			return error(_("binary patch does not apply to '%s'"),
				     name);
 
		/* verify that the result matches */
		hash_sha1_file(img->buf, img->len, blob_type, sha1);
		if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
			return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"),
				name, patch->new_sha1_prefix, sha1_to_hex(sha1));
	}
 
	return 0;
}
 
static int apply_fragments(struct image *img, struct patch *patch)
{
	struct fragment *frag = patch->fragments;
	const char *name = patch->old_name ? patch->old_name : patch->new_name;
	unsigned ws_rule = patch->ws_rule;
	unsigned inaccurate_eof = patch->inaccurate_eof;
	int nth = 0;
 
	if (patch->is_binary)
		return apply_binary(img, patch);
 
	while (frag) {
		nth++;
		if (apply_one_fragment(img, frag, inaccurate_eof, ws_rule, nth)) {
			error(_("patch failed: %s:%ld"), name, frag->oldpos);
			if (!apply_with_reject)
				return -1;
			frag->rejected = 1;
		}
		frag = frag->next;
	}
	return 0;
}
 
static int read_blob_object(struct strbuf *buf, const unsigned char *sha1, unsigned mode)
{
	if (S_ISGITLINK(mode)) {
		strbuf_grow(buf, 100);
		strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(sha1));
	} else {
		enum object_type type;
		unsigned long sz;
		char *result;
 
		result = read_sha1_file(sha1, &type, &sz);
		if (!result)
			return -1;
		/* XXX read_sha1_file NUL-terminates */
		strbuf_attach(buf, result, sz, sz + 1);
	}
	return 0;
}
 
static int read_file_or_gitlink(const struct cache_entry *ce, struct strbuf *buf)
{
	if (!ce)
		return 0;
	return read_blob_object(buf, ce->sha1, ce->ce_mode);
}
 
static struct patch *in_fn_table(const char *name)
{
	struct string_list_item *item;
 
	if (name == NULL)
		return NULL;
 
	item = string_list_lookup(&fn_table, name);
	if (item != NULL)
		return (struct patch *)item->util;
 
	return NULL;
}
 
/*
 * item->util in the filename table records the status of the path.
 * Usually it points at a patch (whose result records the contents
 * of it after applying it), but it could be PATH_WAS_DELETED for a
 * path that a previously applied patch has already removed, or
 * PATH_TO_BE_DELETED for a path that a later patch would remove.
 *
 * The latter is needed to deal with a case where two paths A and B
 * are swapped by first renaming A to B and then renaming B to A;
 * moving A to B should not be prevented due to presence of B as we
 * will remove it in a later patch.
 */
#define PATH_TO_BE_DELETED ((struct patch *) -2)
#define PATH_WAS_DELETED ((struct patch *) -1)
 
static int to_be_deleted(struct patch *patch)
{
	return patch == PATH_TO_BE_DELETED;
}
 
static int was_deleted(struct patch *patch)
{
	return patch == PATH_WAS_DELETED;
}
 
static void add_to_fn_table(struct patch *patch)
{
	struct string_list_item *item;
 
	/*
	 * Always add new_name unless patch is a deletion
	 * This should cover the cases for normal diffs,
	 * file creations and copies
	 */
	if (patch->new_name != NULL) {
		item = string_list_insert(&fn_table, patch->new_name);
		item->util = patch;
	}
 
	/*
	 * store a failure on rename/deletion cases because
	 * later chunks shouldn't patch old names
	 */
	if ((patch->new_name == NULL) || (patch->is_rename)) {
		item = string_list_insert(&fn_table, patch->old_name);
		item->util = PATH_WAS_DELETED;
	}
}
 
static void prepare_fn_table(struct patch *patch)
{
	/*
	 * store information about incoming file deletion
	 */
	while (patch) {
		if ((patch->new_name == NULL) || (patch->is_rename)) {
			struct string_list_item *item;
			item = string_list_insert(&fn_table, patch->old_name);
			item->util = PATH_TO_BE_DELETED;
		}
		patch = patch->next;
	}
}
 
static int checkout_target(struct index_state *istate,
			   struct cache_entry *ce, struct stat *st)
{
	struct checkout costate;
 
	memset(&costate, 0, sizeof(costate));
	costate.base_dir = "";
	costate.refresh_cache = 1;
	costate.istate = istate;
	if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st))
		return error(_("cannot checkout %s"), ce->name);
	return 0;
}
 
static struct patch *previous_patch(struct patch *patch, int *gone)
{
	struct patch *previous;
 
	*gone = 0;
	if (patch->is_copy || patch->is_rename)
		return NULL; /* "git" patches do not depend on the order */
 
	previous = in_fn_table(patch->old_name);
	if (!previous)
		return NULL;
 
	if (to_be_deleted(previous))
		return NULL; /* the deletion hasn't happened yet */
 
	if (was_deleted(previous))
		*gone = 1;
 
	return previous;
}
 
static int verify_index_match(const struct cache_entry *ce, struct stat *st)
{
	if (S_ISGITLINK(ce->ce_mode)) {
		if (!S_ISDIR(st->st_mode))
			return -1;
		return 0;
	}
	return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
}
 
#define SUBMODULE_PATCH_WITHOUT_INDEX 1
 
static int load_patch_target(struct strbuf *buf,
			     const struct cache_entry *ce,
			     struct stat *st,
			     const char *name,
			     unsigned expected_mode)
{
	if (cached) {
		if (read_file_or_gitlink(ce, buf))
			return error(_("read of %s failed"), name);
	} else if (name) {
		if (S_ISGITLINK(expected_mode)) {
			if (ce)
				return read_file_or_gitlink(ce, buf);
			else
				return SUBMODULE_PATCH_WITHOUT_INDEX;
		} else {
			if (read_old_data(st, name, buf))
				return error(_("read of %s failed"), name);
		}
	}
	return 0;
}
 
/*
 * We are about to apply "patch"; populate the "image" with the
 * current version we have, from the working tree or from the index,
 * depending on the situation e.g. --cached/--index.  If we are
 * applying a non-git patch that incrementally updates the tree,
 * we read from the result of a previous diff.
 */
static int load_preimage(struct image *image,
			 struct patch *patch, struct stat *st,
			 const struct cache_entry *ce)
{
	struct strbuf buf = STRBUF_INIT;
	size_t len;
	char *img;
	struct patch *previous;
	int status;
 
	previous = previous_patch(patch, &status);
	if (status)
		return error(_("path %s has been renamed/deleted"),
			     patch->old_name);
	if (previous) {
		/* We have a patched copy in memory; use that. */
		strbuf_add(&buf, previous->result, previous->resultsize);
	} else {
		status = load_patch_target(&buf, ce, st,
					   patch->old_name, patch->old_mode);
		if (status < 0)
			return status;
		else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) {
			/*
			 * There is no way to apply subproject
			 * patch without looking at the index.
			 * NEEDSWORK: shouldn't this be flagged
			 * as an error???
			 */
			free_fragment_list(patch->fragments);
			patch->fragments = NULL;
		} else if (status) {
			return error(_("read of %s failed"), patch->old_name);
		}
	}
 
	img = strbuf_detach(&buf, &len);
	prepare_image(image, img, len, !patch->is_binary);
	return 0;
}
 
static int three_way_merge(struct image *image,
			   char *path,
			   const unsigned char *base,
			   const unsigned char *ours,
			   const unsigned char *theirs)
{
	mmfile_t base_file, our_file, their_file;
	mmbuffer_t result = { NULL };
	int status;
 
	read_mmblob(&base_file, base);
	read_mmblob(&our_file, ours);
	read_mmblob(&their_file, theirs);
	status = ll_merge(&result, path,
			  &base_file, "base",
			  &our_file, "ours",
			  &their_file, "theirs", NULL);
	free(base_file.ptr);
	free(our_file.ptr);
	free(their_file.ptr);
	if (status < 0 || !result.ptr) {
		free(result.ptr);
		return -1;
	}
	clear_image(image);
	image->buf = result.ptr;
	image->len = result.size;
 
	return status;
}
 
/*
 * When directly falling back to add/add three-way merge, we read from
 * the current contents of the new_name.  In no cases other than that
 * this function will be called.
 */
static int load_current(struct image *image, struct patch *patch)
{
	struct strbuf buf = STRBUF_INIT;
	int status, pos;
	size_t len;
	char *img;
	struct stat st;
	struct cache_entry *ce;
	char *name = patch->new_name;
	unsigned mode = patch->new_mode;
 
	if (!patch->is_new)
		die("BUG: patch to %s is not a creation", patch->old_name);
 
	pos = cache_name_pos(name, strlen(name));
	if (pos < 0)
		return error(_("%s: does not exist in index"), name);
	ce = active_cache[pos];
	if (lstat(name, &st)) {
		if (errno != ENOENT)
			return error(_("%s: %s"), name, strerror(errno));
		if (checkout_target(&the_index, ce, &st))
			return -1;
	}
	if (verify_index_match(ce, &st))
		return error(_("%s: does not match index"), name);
 
	status = load_patch_target(&buf, ce, &st, name, mode);
	if (status < 0)
		return status;
	else if (status)
		return -1;
	img = strbuf_detach(&buf, &len);
	prepare_image(image, img, len, !patch->is_binary);
	return 0;
}
 
static int try_threeway(struct image *image, struct patch *patch,
			struct stat *st, const struct cache_entry *ce)
{
	unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
	struct strbuf buf = STRBUF_INIT;
	size_t len;
	int status;
	char *img;
	struct image tmp_image;
 
	/* No point falling back to 3-way merge in these cases */
	if (patch->is_delete ||
	    S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
		return -1;
 
	/* Preimage the patch was prepared for */
	if (patch->is_new)
		write_sha1_file("", 0, blob_type, pre_sha1);
	else if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
		 read_blob_object(&buf, pre_sha1, patch->old_mode))
		return error("repository lacks the necessary blob to fall back on 3-way merge.");
 
	fprintf(stderr, "Falling back to three-way merge...\n");
 
	img = strbuf_detach(&buf, &len);
	prepare_image(&tmp_image, img, len, 1);
	/* Apply the patch to get the post image */
	if (apply_fragments(&tmp_image, patch) < 0) {
		clear_image(&tmp_image);
		return -1;
	}
	/* post_sha1[] is theirs */
	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
	clear_image(&tmp_image);
 
	/* our_sha1[] is ours */
	if (patch->is_new) {
		if (load_current(&tmp_image, patch))
			return error("cannot read the current contents of '%s'",
				     patch->new_name);
	} else {
		if (load_preimage(&tmp_image, patch, st, ce))
			return error("cannot read the current contents of '%s'",
				     patch->old_name);
	}
	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
	clear_image(&tmp_image);
 
	/* in-core three-way merge between post and our using pre as base */
	status = three_way_merge(image, patch->new_name,
				 pre_sha1, our_sha1, post_sha1);
	if (status < 0) {
		fprintf(stderr, "Failed to fall back on three-way merge...\n");
		return status;
	}
 
	if (status) {
		patch->conflicted_threeway = 1;
		if (patch->is_new)
			hashclr(patch->threeway_stage[0]);
		else
			hashcpy(patch->threeway_stage[0], pre_sha1);
		hashcpy(patch->threeway_stage[1], our_sha1);
		hashcpy(patch->threeway_stage[2], post_sha1);
		fprintf(stderr, "Applied patch to '%s' with conflicts.\n", patch->new_name);
	} else {
		fprintf(stderr, "Applied patch to '%s' cleanly.\n", patch->new_name);
	}
	return 0;
}
 
static int apply_data(struct patch *patch, struct stat *st, const struct cache_entry *ce)
{
	struct image image;
 
	if (load_preimage(&image, patch, st, ce) < 0)
		return -1;
 
	if (patch->direct_to_threeway ||
	    apply_fragments(&image, patch) < 0) {
		/* Note: with --reject, apply_fragments() returns 0 */
		if (!threeway || try_threeway(&image, patch, st, ce) < 0)
			return -1;
	}
	patch->result = image.buf;
	patch->resultsize = image.len;
	add_to_fn_table(patch);
	free(image.line_allocated);
 
	if (0 < patch->is_delete && patch->resultsize)
		return error(_("removal patch leaves file contents"));
 
	return 0;
}
 
/*
 * If "patch" that we are looking at modifies or deletes what we have,
 * we would want it not to lose any local modification we have, either
 * in the working tree or in the index.
 *
 * This also decides if a non-git patch is a creation patch or a
 * modification to an existing empty file.  We do not check the state
 * of the current tree for a creation patch in this function; the caller
 * check_patch() separately makes sure (and errors out otherwise) that
 * the path the patch creates does not exist in the current tree.
 */
static int check_preimage(struct patch *patch, struct cache_entry **ce, struct stat *st)
{
	const char *old_name = patch->old_name;
	struct patch *previous = NULL;
	int stat_ret = 0, status;
	unsigned st_mode = 0;
 
	if (!old_name)
		return 0;
 
	assert(patch->is_new <= 0);
	previous = previous_patch(patch, &status);
 
	if (status)
		return error(_("path %s has been renamed/deleted"), old_name);
	if (previous) {
		st_mode = previous->new_mode;
	} else if (!cached) {
		stat_ret = lstat(old_name, st);
		if (stat_ret && errno != ENOENT)
			return error(_("%s: %s"), old_name, strerror(errno));
	}
 
	if (check_index && !previous) {
		int pos = cache_name_pos(old_name, strlen(old_name));
		if (pos < 0) {
			if (patch->is_new < 0)
				goto is_new;
			return error(_("%s: does not exist in index"), old_name);
		}
		*ce = active_cache[pos];
		if (stat_ret < 0) {
			if (checkout_target(&the_index, *ce, st))
				return -1;
		}
		if (!cached && verify_index_match(*ce, st))
			return error(_("%s: does not match index"), old_name);
		if (cached)
			st_mode = (*ce)->ce_mode;
	} else if (stat_ret < 0) {
		if (patch->is_new < 0)
			goto is_new;
		return error(_("%s: %s"), old_name, strerror(errno));
	}
 
	if (!cached && !previous)
		st_mode = ce_mode_from_stat(*ce, st->st_mode);
 
	if (patch->is_new < 0)
		patch->is_new = 0;
	if (!patch->old_mode)
		patch->old_mode = st_mode;
	if ((st_mode ^ patch->old_mode) & S_IFMT)
		return error(_("%s: wrong type"), old_name);
	if (st_mode != patch->old_mode)
		warning(_("%s has type %o, expected %o"),
			old_name, st_mode, patch->old_mode);
	if (!patch->new_mode && !patch->is_delete)
		patch->new_mode = st_mode;
	return 0;
 
 is_new:
	patch->is_new = 1;
	patch->is_delete = 0;
	free(patch->old_name);
	patch->old_name = NULL;
	return 0;
}
 
 
#define EXISTS_IN_INDEX 1
#define EXISTS_IN_WORKTREE 2
 
static int check_to_create(const char *new_name, int ok_if_exists)
{
	struct stat nst;
 
	if (check_index &&
	    cache_name_pos(new_name, strlen(new_name)) >= 0 &&
	    !ok_if_exists)
		return EXISTS_IN_INDEX;
	if (cached)
		return 0;
 
	if (!lstat(new_name, &nst)) {
		if (S_ISDIR(nst.st_mode) || ok_if_exists)
			return 0;
		/*
		 * A leading component of new_name might be a symlink
		 * that is going to be removed with this patch, but
		 * still pointing at somewhere that has the path.
		 * In such a case, path "new_name" does not exist as
		 * far as git is concerned.
		 */
		if (has_symlink_leading_path(new_name, strlen(new_name)))
			return 0;
 
		return EXISTS_IN_WORKTREE;
	} else if ((errno != ENOENT) && (errno != ENOTDIR)) {
		return error("%s: %s", new_name, strerror(errno));
	}
	return 0;
}
 
/*
 * Check and apply the patch in-core; leave the result in patch->result
 * for the caller to write it out to the final destination.
 */
static int check_patch(struct patch *patch)
{
	struct stat st;
	const char *old_name = patch->old_name;
	const char *new_name = patch->new_name;
	const char *name = old_name ? old_name : new_name;
	struct cache_entry *ce = NULL;
	struct patch *tpatch;
	int ok_if_exists;
	int status;
 
	patch->rejected = 1; /* we will drop this after we succeed */
 
	status = check_preimage(patch, &ce, &st);
	if (status)
		return status;
	old_name = patch->old_name;
 
	/*
	 * A type-change diff is always split into a patch to delete
	 * old, immediately followed by a patch to create new (see
	 * diff.c::run_diff()); in such a case it is Ok that the entry
	 * to be deleted by the previous patch is still in the working
	 * tree and in the index.
	 *
	 * A patch to swap-rename between A and B would first rename A
	 * to B and then rename B to A.  While applying the first one,
	 * the presence of B should not stop A from getting renamed to
	 * B; ask to_be_deleted() about the later rename.  Removal of
	 * B and rename from A to B is handled the same way by asking
	 * was_deleted().
	 */
	if ((tpatch = in_fn_table(new_name)) &&
	    (was_deleted(tpatch) || to_be_deleted(tpatch)))
		ok_if_exists = 1;
	else
		ok_if_exists = 0;
 
	if (new_name &&
	    ((0 < patch->is_new) || patch->is_rename || patch->is_copy)) {
		int err = check_to_create(new_name, ok_if_exists);
 
		if (err && threeway) {
			patch->direct_to_threeway = 1;
		} else switch (err) {
		case 0:
			break; /* happy */
		case EXISTS_IN_INDEX:
			return error(_("%s: already exists in index"), new_name);
			break;
		case EXISTS_IN_WORKTREE:
			return error(_("%s: already exists in working directory"),
				     new_name);
		default:
			return err;
		}
 
		if (!patch->new_mode) {
			if (0 < patch->is_new)
				patch->new_mode = S_IFREG | 0644;
			else
				patch->new_mode = patch->old_mode;
		}
	}
 
	if (new_name && old_name) {
		int same = !strcmp(old_name, new_name);
		if (!patch->new_mode)
			patch->new_mode = patch->old_mode;
		if ((patch->old_mode ^ patch->new_mode) & S_IFMT) {
			if (same)
				return error(_("new mode (%o) of %s does not "
					       "match old mode (%o)"),
					patch->new_mode, new_name,
					patch->old_mode);
			else
				return error(_("new mode (%o) of %s does not "
					       "match old mode (%o) of %s"),
					patch->new_mode, new_name,
					patch->old_mode, old_name);
		}
	}
 
	if (apply_data(patch, &st, ce) < 0)
		return error(_("%s: patch does not apply"), name);
	patch->rejected = 0;
	return 0;
}
 
static int check_patch_list(struct patch *patch)
{
	int err = 0;
 
	prepare_fn_table(patch);
	while (patch) {
		if (apply_verbosely)
			say_patch_name(stderr,
				       _("Checking patch %s..."), patch);
		err |= check_patch(patch);
		patch = patch->next;
	}
	return err;
}
 
/* This function tries to read the sha1 from the current index */
static int get_current_sha1(const char *path, unsigned char *sha1)
{
	int pos;
 
	if (read_cache() < 0)
		return -1;
	pos = cache_name_pos(path, strlen(path));
	if (pos < 0)
		return -1;
	hashcpy(sha1, active_cache[pos]->sha1);
	return 0;
}
 
static int preimage_sha1_in_gitlink_patch(struct patch *p, unsigned char sha1[20])
{
	/*
	 * A usable gitlink patch has only one fragment (hunk) that looks like:
	 * @@ -1 +1 @@
	 * -Subproject commit <old sha1>
	 * +Subproject commit <new sha1>
	 * or
	 * @@ -1 +0,0 @@
	 * -Subproject commit <old sha1>
	 * for a removal patch.
	 */
	struct fragment *hunk = p->fragments;
	static const char heading[] = "-Subproject commit ";
	char *preimage;
 
	if (/* does the patch have only one hunk? */
	    hunk && !hunk->next &&
	    /* is its preimage one line? */
	    hunk->oldpos == 1 && hunk->oldlines == 1 &&
	    /* does preimage begin with the heading? */
	    (preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL &&
	    starts_with(++preimage, heading) &&
	    /* does it record full SHA-1? */
	    !get_sha1_hex(preimage + sizeof(heading) - 1, sha1) &&
	    preimage[sizeof(heading) + 40 - 1] == '\n' &&
	    /* does the abbreviated name on the index line agree with it? */
	    starts_with(preimage + sizeof(heading) - 1, p->old_sha1_prefix))
		return 0; /* it all looks fine */
 
	/* we may have full object name on the index line */
	return get_sha1_hex(p->old_sha1_prefix, sha1);
}
 
/* Build an index that contains the just the files needed for a 3way merge */
static void build_fake_ancestor(struct patch *list, const char *filename)
{
	struct patch *patch;
	struct index_state result = { NULL };
	static struct lock_file lock;
 
	/* Once we start supporting the reverse patch, it may be
	 * worth showing the new sha1 prefix, but until then...
	 */
	for (patch = list; patch; patch = patch->next) {
		unsigned char sha1[20];
		struct cache_entry *ce;
		const char *name;
 
		name = patch->old_name ? patch->old_name : patch->new_name;
		if (0 < patch->is_new)
			continue;
 
		if (S_ISGITLINK(patch->old_mode)) {
			if (!preimage_sha1_in_gitlink_patch(patch, sha1))
				; /* ok, the textual part looks sane */
			else
				die("sha1 information is lacking or useless for submoule %s",
				    name);
		} else if (!get_sha1_blob(patch->old_sha1_prefix, sha1)) {
			; /* ok */
		} else if (!patch->lines_added && !patch->lines_deleted) {
			/* mode-only change: update the current */
			if (get_current_sha1(patch->old_name, sha1))
				die("mode change for %s, which is not "
				    "in current HEAD", name);
		} else
			die("sha1 information is lacking or useless "
			    "(%s).", name);
 
		ce = make_cache_entry(patch->old_mode, sha1, name, 0, 0);
		if (!ce)
			die(_("make_cache_entry failed for path '%s'"), name);
		if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
			die ("Could not add %s to temporary index", name);
	}
 
	hold_lock_file_for_update(&lock, filename, LOCK_DIE_ON_ERROR);
	if (write_locked_index(&result, &lock, COMMIT_LOCK))
		die ("Could not write temporary index to %s", filename);
 
	discard_index(&result);
}
 
static void stat_patch_list(struct patch *patch)
{
	int files, adds, dels;
 
	for (files = adds = dels = 0 ; patch ; patch = patch->next) {
		files++;
		adds += patch->lines_added;
		dels += patch->lines_deleted;
		show_stats(patch);
	}
 
	print_stat_summary(stdout, files, adds, dels);
}
 
static void numstat_patch_list(struct patch *patch)
{
	for ( ; patch; patch = patch->next) {
		const char *name;
		name = patch->new_name ? patch->new_name : patch->old_name;
		if (patch->is_binary)
			printf("-\t-\t");
		else
			printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
		write_name_quoted(name, stdout, line_termination);
	}
}
 
static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
{
	if (mode)
		printf(" %s mode %06o %s\n", newdelete, mode, name);
	else
		printf(" %s %s\n", newdelete, name);
}
 
static void show_mode_change(struct patch *p, int show_name)
{
	if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
		if (show_name)
			printf(" mode change %06o => %06o %s\n",
			       p->old_mode, p->new_mode, p->new_name);
		else
			printf(" mode change %06o => %06o\n",
			       p->old_mode, p->new_mode);
	}
}
 
static void show_rename_copy(struct patch *p)
{
	const char *renamecopy = p->is_rename ? "rename" : "copy";
	const char *old, *new;
 
	/* Find common prefix */
	old = p->old_name;
	new = p->new_name;
	while (1) {
		const char *slash_old, *slash_new;
		slash_old = strchr(old, '/');
		slash_new = strchr(new, '/');
		if (!slash_old ||
		    !slash_new ||
		    slash_old - old != slash_new - new ||
		    memcmp(old, new, slash_new - new))
			break;
		old = slash_old + 1;
		new = slash_new + 1;
	}
	/* p->old_name thru old is the common prefix, and old and new
	 * through the end of names are renames
	 */
	if (old != p->old_name)
		printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
		       (int)(old - p->old_name), p->old_name,
		       old, new, p->score);
	else
		printf(" %s %s => %s (%d%%)\n", renamecopy,
		       p->old_name, p->new_name, p->score);
	show_mode_change(p, 0);
}
 
static void summary_patch_list(struct patch *patch)
{
	struct patch *p;
 
	for (p = patch; p; p = p->next) {
		if (p->is_new)
			show_file_mode_name("create", p->new_mode, p->new_name);
		else if (p->is_delete)
			show_file_mode_name("delete", p->old_mode, p->old_name);
		else {
			if (p->is_rename || p->is_copy)
				show_rename_copy(p);
			else {
				if (p->score) {
					printf(" rewrite %s (%d%%)\n",
					       p->new_name, p->score);
					show_mode_change(p, 0);
				}
				else
					show_mode_change(p, 1);
			}
		}
	}
}
 
static void patch_stats(struct patch *patch)
{
	int lines = patch->lines_added + patch->lines_deleted;
 
	if (lines > max_change)
		max_change = lines;
	if (patch->old_name) {
		int len = quote_c_style(patch->old_name, NULL, NULL, 0);
		if (!len)
			len = strlen(patch->old_name);
		if (len > max_len)
			max_len = len;
	}
	if (patch->new_name) {
		int len = quote_c_style(patch->new_name, NULL, NULL, 0);
		if (!len)
			len = strlen(patch->new_name);
		if (len > max_len)
			max_len = len;
	}
}
 
static void remove_file(struct patch *patch, int rmdir_empty)
{
	if (update_index) {
		if (remove_file_from_cache(patch->old_name) < 0)
			die(_("unable to remove %s from index"), patch->old_name);
	}
	if (!cached) {
		if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) {
			remove_path(patch->old_name);
		}
	}
}
 
static void add_index_file(const char *path, unsigned mode, void *buf, unsigned long size)
{
	struct stat st;
	struct cache_entry *ce;
	int namelen = strlen(path);
	unsigned ce_size = cache_entry_size(namelen);
 
	if (!update_index)
		return;
 
	ce = xcalloc(1, ce_size);
	memcpy(ce->name, path, namelen);
	ce->ce_mode = create_ce_mode(mode);
	ce->ce_flags = create_ce_flags(0);
	ce->ce_namelen = namelen;
	if (S_ISGITLINK(mode)) {
		const char *s;
 
		if (!skip_prefix(buf, "Subproject commit ", &s) ||
		    get_sha1_hex(s, ce->sha1))
			die(_("corrupt patch for submodule %s"), path);
	} else {
		if (!cached) {
			if (lstat(path, &st) < 0)
				die_errno(_("unable to stat newly created file '%s'"),
					  path);
			fill_stat_cache_info(ce, &st);
		}
		if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
			die(_("unable to create backing store for newly created file %s"), path);
	}
	if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
		die(_("unable to add cache entry for %s"), path);
}
 
static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
{
	int fd;
	struct strbuf nbuf = STRBUF_INIT;
 
	if (S_ISGITLINK(mode)) {
		struct stat st;
		if (!lstat(path, &st) && S_ISDIR(st.st_mode))
			return 0;
		return mkdir(path, 0777);
	}
 
	if (has_symlinks && S_ISLNK(mode))
		/* Although buf:size is counted string, it also is NUL
		 * terminated.
		 */
		return symlink(buf, path);
 
	fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
	if (fd < 0)
		return -1;
 
	if (convert_to_working_tree(path, buf, size, &nbuf)) {
		size = nbuf.len;
		buf  = nbuf.buf;
	}
	write_or_die(fd, buf, size);
	strbuf_release(&nbuf);
 
	if (close(fd) < 0)
		die_errno(_("closing file '%s'"), path);
	return 0;
}
 
/*
 * We optimistically assume that the directories exist,
 * which is true 99% of the time anyway. If they don't,
 * we create them and try again.
 */
static void create_one_file(char *path, unsigned mode, const char *buf, unsigned long size)
{
	if (cached)
		return;
	if (!try_create_file(path, mode, buf, size))
		return;
 
	if (errno == ENOENT) {
		if (safe_create_leading_directories(path))
			return;
		if (!try_create_file(path, mode, buf, size))
			return;
	}
 
	if (errno == EEXIST || errno == EACCES) {
		/* We may be trying to create a file where a directory
		 * used to be.
		 */
		struct stat st;
		if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
			errno = EEXIST;
	}
 
	if (errno == EEXIST) {
		unsigned int nr = getpid();
 
		for (;;) {
			char newpath[PATH_MAX];
			mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
			if (!try_create_file(newpath, mode, buf, size)) {
				if (!rename(newpath, path))
					return;
				unlink_or_warn(newpath);
				break;
			}
			if (errno != EEXIST)
				break;
			++nr;
		}
	}
	die_errno(_("unable to write file '%s' mode %o"), path, mode);
}
 
static void add_conflicted_stages_file(struct patch *patch)
{
	int stage, namelen;
	unsigned ce_size, mode;
	struct cache_entry *ce;
 
	if (!update_index)
		return;
	namelen = strlen(patch->new_name);
	ce_size = cache_entry_size(namelen);
	mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644);
 
	remove_file_from_cache(patch->new_name);
	for (stage = 1; stage < 4; stage++) {
		if (is_null_sha1(patch->threeway_stage[stage - 1]))
			continue;
		ce = xcalloc(1, ce_size);
		memcpy(ce->name, patch->new_name, namelen);
		ce->ce_mode = create_ce_mode(mode);
		ce->ce_flags = create_ce_flags(stage);
		ce->ce_namelen = namelen;
		hashcpy(ce->sha1, patch->threeway_stage[stage - 1]);
		if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
			die(_("unable to add cache entry for %s"), patch->new_name);
	}
}
 
static void create_file(struct patch *patch)
{
	char *path = patch->new_name;
	unsigned mode = patch->new_mode;
	unsigned long size = patch->resultsize;
	char *buf = patch->result;
 
	if (!mode)
		mode = S_IFREG | 0644;
	create_one_file(path, mode, buf, size);
 
	if (patch->conflicted_threeway)
		add_conflicted_stages_file(patch);
	else
		add_index_file(path, mode, buf, size);
}
 
/* phase zero is to remove, phase one is to create */
static void write_out_one_result(struct patch *patch, int phase)
{
	if (patch->is_delete > 0) {
		if (phase == 0)
			remove_file(patch, 1);
		return;
	}
	if (patch->is_new > 0 || patch->is_copy) {
		if (phase == 1)
			create_file(patch);
		return;
	}
	/*
	 * Rename or modification boils down to the same
	 * thing: remove the old, write the new
	 */
	if (phase == 0)
		remove_file(patch, patch->is_rename);
	if (phase == 1)
		create_file(patch);
}
 
static int write_out_one_reject(struct patch *patch)
{
	FILE *rej;
	char namebuf[PATH_MAX];
	struct fragment *frag;
	int cnt = 0;
	struct strbuf sb = STRBUF_INIT;
 
	for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
		if (!frag->rejected)
			continue;
		cnt++;
	}
 
	if (!cnt) {
		if (apply_verbosely)
			say_patch_name(stderr,
				       _("Applied patch %s cleanly."), patch);
		return 0;
	}
 
	/* This should not happen, because a removal patch that leaves
	 * contents are marked "rejected" at the patch level.
	 */
	if (!patch->new_name)
		die(_("internal error"));
 
	/* Say this even without --verbose */
	strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...",
			    "Applying patch %%s with %d rejects...",
			    cnt),
		    cnt);
	say_patch_name(stderr, sb.buf, patch);
	strbuf_release(&sb);
 
	cnt = strlen(patch->new_name);
	if (ARRAY_SIZE(namebuf) <= cnt + 5) {
		cnt = ARRAY_SIZE(namebuf) - 5;
		warning(_("truncating .rej filename to %.*s.rej"),
			cnt - 1, patch->new_name);
	}
	memcpy(namebuf, patch->new_name, cnt);
	memcpy(namebuf + cnt, ".rej", 5);
 
	rej = fopen(namebuf, "w");
	if (!rej)
		return error(_("cannot open %s: %s"), namebuf, strerror(errno));
 
	/* Normal git tools never deal with .rej, so do not pretend
	 * this is a git patch by saying --git or giving extended
	 * headers.  While at it, maybe please "kompare" that wants
	 * the trailing TAB and some garbage at the end of line ;-).
	 */
	fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
		patch->new_name, patch->new_name);
	for (cnt = 1, frag = patch->fragments;
	     frag;
	     cnt++, frag = frag->next) {
		if (!frag->rejected) {
			fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
			continue;
		}
		fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
		fprintf(rej, "%.*s", frag->size, frag->patch);
		if (frag->patch[frag->size-1] != '\n')
			fputc('\n', rej);
	}
	fclose(rej);
	return -1;
}
 
static int write_out_results(struct patch *list)
{
	int phase;
	int errs = 0;
	struct patch *l;
	struct string_list cpath = STRING_LIST_INIT_DUP;
 
	for (phase = 0; phase < 2; phase++) {
		l = list;
		while (l) {
			if (l->rejected)
				errs = 1;
			else {
				write_out_one_result(l, phase);
				if (phase == 1) {
					if (write_out_one_reject(l))
						errs = 1;
					if (l->conflicted_threeway) {
						string_list_append(&cpath, l->new_name);
						errs = 1;
					}
				}
			}
			l = l->next;
		}
	}
 
	if (cpath.nr) {
		struct string_list_item *item;
 
		sort_string_list(&cpath);
		for_each_string_list_item(item, &cpath)
			fprintf(stderr, "U %s\n", item->string);
		string_list_clear(&cpath, 0);
 
		rerere(0);
	}
 
	return errs;
}
 
static struct lock_file lock_file;
 
#define INACCURATE_EOF	(1<<0)
#define RECOUNT		(1<<1)
 
static int apply_patch(int fd, const char *filename, int options)
{
	size_t offset;
	struct strbuf buf = STRBUF_INIT; /* owns the patch text */
	struct patch *list = NULL, **listp = &list;
	int skipped_patch = 0;
 
	patch_input_file = filename;
	read_patch_file(&buf, fd);
	offset = 0;
	while (offset < buf.len) {
		struct patch *patch;
		int nr;
 
		patch = xcalloc(1, sizeof(*patch));
		patch->inaccurate_eof = !!(options & INACCURATE_EOF);
		patch->recount =  !!(options & RECOUNT);
		nr = parse_chunk(buf.buf + offset, buf.len - offset, patch);
		if (nr < 0)
			break;
		if (apply_in_reverse)
			reverse_patches(patch);
		if (use_patch(patch)) {
			patch_stats(patch);
			*listp = patch;
			listp = &patch->next;
		}
		else {
			free_patch(patch);
			skipped_patch++;
		}
		offset += nr;
	}
 
	if (!list && !skipped_patch)
		die(_("unrecognized input"));
 
	if (whitespace_error && (ws_error_action == die_on_ws_error))
		apply = 0;
 
	update_index = check_index && apply;
	if (update_index && newfd < 0)
		newfd = hold_locked_index(&lock_file, 1);
 
	if (check_index) {
		if (read_cache() < 0)
			die(_("unable to read index file"));
	}
 
	if ((check || apply) &&
	    check_patch_list(list) < 0 &&
	    !apply_with_reject)
		exit(1);
 
	if (apply && write_out_results(list)) {
		if (apply_with_reject)
			exit(1);
		/* with --3way, we still need to write the index out */
		return 1;
	}
 
	if (fake_ancestor)
		build_fake_ancestor(list, fake_ancestor);
 
	if (diffstat)
		stat_patch_list(list);
 
	if (numstat)
		numstat_patch_list(list);
 
	if (summary)
		summary_patch_list(list);
 
	free_patch_list(list);
	strbuf_release(&buf);
	string_list_clear(&fn_table, 0);
	return 0;
}
 
static void git_apply_config(void)
{
	git_config_get_string_const("apply.whitespace", &apply_default_whitespace);
	git_config_get_string_const("apply.ignorewhitespace", &apply_default_ignorewhitespace);
	git_config(git_default_config, NULL);
}
 
static int option_parse_exclude(const struct option *opt,
				const char *arg, int unset)
{
	add_name_limit(arg, 1);
	return 0;
}
 
static int option_parse_include(const struct option *opt,
				const char *arg, int unset)
{
	add_name_limit(arg, 0);
	has_include = 1;
	return 0;
}
 
static int option_parse_p(const struct option *opt,
			  const char *arg, int unset)
{
	p_value = atoi(arg);
	p_value_known = 1;
	return 0;
}
 
static int option_parse_z(const struct option *opt,
			  const char *arg, int unset)
{
	if (unset)
		line_termination = '\n';
	else
		line_termination = 0;
	return 0;
}
 
static int option_parse_space_change(const struct option *opt,
			  const char *arg, int unset)
{
	if (unset)
		ws_ignore_action = ignore_ws_none;
	else
		ws_ignore_action = ignore_ws_change;
	return 0;
}
 
static int option_parse_whitespace(const struct option *opt,
				   const char *arg, int unset)
{
	const char **whitespace_option = opt->value;
 
	*whitespace_option = arg;
	parse_whitespace_option(arg);
	return 0;
}
 
static int option_parse_directory(const struct option *opt,
				  const char *arg, int unset)
{
	root_len = strlen(arg);
	if (root_len && arg[root_len - 1] != '/') {
		char *new_root;
		root = new_root = xmalloc(root_len + 2);
		strcpy(new_root, arg);
		strcpy(new_root + root_len++, "/");
	} else
		root = arg;
	return 0;
}
 
int cmd_apply(int argc, const char **argv, const char *prefix_)
{
	int i;
	int errs = 0;
	int is_not_gitdir = !startup_info->have_repository;
	int force_apply = 0;
 
	const char *whitespace_option = NULL;
 
	struct option builtin_apply_options[] = {
		{ OPTION_CALLBACK, 0, "exclude", NULL, N_("path"),
			N_("don't apply changes matching the given path"),
			0, option_parse_exclude },
		{ OPTION_CALLBACK, 0, "include", NULL, N_("path"),
			N_("apply changes matching the given path"),
			0, option_parse_include },
		{ OPTION_CALLBACK, 'p', NULL, NULL, N_("num"),
			N_("remove <num> leading slashes from traditional diff paths"),
			0, option_parse_p },
		OPT_BOOL(0, "no-add", &no_add,
			N_("ignore additions made by the patch")),
		OPT_BOOL(0, "stat", &diffstat,
			N_("instead of applying the patch, output diffstat for the input")),
		OPT_NOOP_NOARG(0, "allow-binary-replacement"),
		OPT_NOOP_NOARG(0, "binary"),
		OPT_BOOL(0, "numstat", &numstat,
			N_("show number of added and deleted lines in decimal notation")),
		OPT_BOOL(0, "summary", &summary,
			N_("instead of applying the patch, output a summary for the input")),
		OPT_BOOL(0, "check", &check,
			N_("instead of applying the patch, see if the patch is applicable")),
		OPT_BOOL(0, "index", &check_index,
			N_("make sure the patch is applicable to the current index")),
		OPT_BOOL(0, "cached", &cached,
			N_("apply a patch without touching the working tree")),
		OPT_BOOL(0, "apply", &force_apply,
			N_("also apply the patch (use with --stat/--summary/--check)")),
		OPT_BOOL('3', "3way", &threeway,
			 N_( "attempt three-way merge if a patch does not apply")),
		OPT_FILENAME(0, "build-fake-ancestor", &fake_ancestor,
			N_("build a temporary index based on embedded index information")),
		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
			N_("paths are separated with NUL character"),
			PARSE_OPT_NOARG, option_parse_z },
		OPT_INTEGER('C', NULL, &p_context,
				N_("ensure at least <n> lines of context match")),
		{ OPTION_CALLBACK, 0, "whitespace", &whitespace_option, N_("action"),
			N_("detect new or modified lines that have whitespace errors"),
			0, option_parse_whitespace },
		{ OPTION_CALLBACK, 0, "ignore-space-change", NULL, NULL,
			N_("ignore changes in whitespace when finding context"),
			PARSE_OPT_NOARG, option_parse_space_change },
		{ OPTION_CALLBACK, 0, "ignore-whitespace", NULL, NULL,
			N_("ignore changes in whitespace when finding context"),
			PARSE_OPT_NOARG, option_parse_space_change },
		OPT_BOOL('R', "reverse", &apply_in_reverse,
			N_("apply the patch in reverse")),
		OPT_BOOL(0, "unidiff-zero", &unidiff_zero,
			N_("don't expect at least one line of context")),
		OPT_BOOL(0, "reject", &apply_with_reject,
			N_("leave the rejected hunks in corresponding *.rej files")),
		OPT_BOOL(0, "allow-overlap", &allow_overlap,
			N_("allow overlapping hunks")),
		OPT__VERBOSE(&apply_verbosely, N_("be verbose")),
		OPT_BIT(0, "inaccurate-eof", &options,
			N_("tolerate incorrectly detected missing new-line at the end of file"),
			INACCURATE_EOF),
		OPT_BIT(0, "recount", &options,
			N_("do not trust the line counts in the hunk headers"),
			RECOUNT),
		{ OPTION_CALLBACK, 0, "directory", NULL, N_("root"),
			N_("prepend <root> to all filenames"),
			0, option_parse_directory },
		OPT_END()
	};
 
	prefix = prefix_;
	prefix_length = prefix ? strlen(prefix) : 0;
	git_apply_config();
	if (apply_default_whitespace)
		parse_whitespace_option(apply_default_whitespace);
	if (apply_default_ignorewhitespace)
		parse_ignorewhitespace_option(apply_default_ignorewhitespace);
 
	argc = parse_options(argc, argv, prefix, builtin_apply_options,
			apply_usage, 0);
 
	if (apply_with_reject && threeway)
		die("--reject and --3way cannot be used together.");
	if (cached && threeway)
		die("--cached and --3way cannot be used together.");
	if (threeway) {
		if (is_not_gitdir)
			die(_("--3way outside a repository"));
		check_index = 1;
	}
	if (apply_with_reject)
		apply = apply_verbosely = 1;
	if (!force_apply && (diffstat || numstat || summary || check || fake_ancestor))
		apply = 0;
	if (check_index && is_not_gitdir)
		die(_("--index outside a repository"));
	if (cached) {
		if (is_not_gitdir)
			die(_("--cached outside a repository"));
		check_index = 1;
	}
	for (i = 0; i < argc; i++) {
		const char *arg = argv[i];
		int fd;
 
		if (!strcmp(arg, "-")) {
			errs |= apply_patch(0, "<stdin>", options);
			read_stdin = 0;
			continue;
		} else if (0 < prefix_length)
			arg = prefix_filename(prefix, prefix_length, arg);
 
		fd = open(arg, O_RDONLY);
		if (fd < 0)
			die_errno(_("can't open patch '%s'"), arg);
		read_stdin = 0;
		set_default_whitespace_mode(whitespace_option);
		errs |= apply_patch(fd, arg, options);
		close(fd);
	}
	set_default_whitespace_mode(whitespace_option);
	if (read_stdin)
		errs |= apply_patch(0, "<stdin>", options);
	if (whitespace_error) {
		if (squelch_whitespace_errors &&
		    squelch_whitespace_errors < whitespace_error) {
			int squelched =
				whitespace_error - squelch_whitespace_errors;
			warning(Q_("squelched %d whitespace error",
				   "squelched %d whitespace errors",
				   squelched),
				squelched);
		}
		if (ws_error_action == die_on_ws_error)
			die(Q_("%d line adds whitespace errors.",
			       "%d lines add whitespace errors.",
			       whitespace_error),
			    whitespace_error);
		if (applied_after_fixing_ws && apply)
			warning("%d line%s applied after"
				" fixing whitespace errors.",
				applied_after_fixing_ws,
				applied_after_fixing_ws == 1 ? "" : "s");
		else if (whitespace_error)
			warning(Q_("%d line adds whitespace errors.",
				   "%d lines add whitespace errors.",
				   whitespace_error),
				whitespace_error);
	}
 
	if (update_index) {
		if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
			die(_("Unable to write new index file"));
	}
 
	return !!errs;
}