diff options
Diffstat (limited to 'xdiff')
| -rw-r--r-- | xdiff/xpatience.c | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/xdiff/xpatience.c b/xdiff/xpatience.c index e8de8d1..1a21c6a 100644 --- a/xdiff/xpatience.c +++ b/xdiff/xpatience.c @@ -198,7 +198,7 @@ static int binary_search(struct entry **sequence, int longest, * item per sequence length: the sequence with the smallest last * element (in terms of line2). */ -static struct entry *find_longest_common_sequence(struct hashmap *map) +static int find_longest_common_sequence(struct hashmap *map, struct entry **res) { struct entry **sequence = xdl_malloc(map->nr * sizeof(struct entry *)); int longest = 0, i; @@ -211,6 +211,9 @@ static struct entry *find_longest_common_sequence(struct hashmap *map) */ int anchor_i = -1; + if (!sequence) + return -1; + for (entry = map->first; entry; entry = entry->next) { if (!entry->line2 || entry->line2 == NON_UNIQUE) continue; @@ -230,8 +233,9 @@ static struct entry *find_longest_common_sequence(struct hashmap *map) /* No common unique lines were found */ if (!longest) { + *res = NULL; xdl_free(sequence); - return NULL; + return 0; } /* Iterate starting at the last element, adjusting the "next" members */ @@ -241,8 +245,9 @@ static struct entry *find_longest_common_sequence(struct hashmap *map) entry->previous->next = entry; entry = entry->previous; } + *res = entry; xdl_free(sequence); - return entry; + return 0; } static int match(struct hashmap *map, int line1, int line2) @@ -358,14 +363,16 @@ static int patience_diff(mmfile_t *file1, mmfile_t *file2, return 0; } - first = find_longest_common_sequence(&map); + result = find_longest_common_sequence(&map, &first); + if (result) + goto out; if (first) result = walk_common_sequence(&map, first, line1, count1, line2, count2); else result = fall_back_to_classic_diff(&map, line1, count1, line2, count2); - + out: xdl_free(map.entries); return result; } |