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-rw-r--r--xdiff/xutils.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
new file mode 100644
index 0000000..8221806
--- /dev/null
+++ b/xdiff/xutils.c
@@ -0,0 +1,277 @@
+/*
+ * LibXDiff by Davide Libenzi ( File Differential Library )
+ * Copyright (C) 2003 Davide Libenzi
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Davide Libenzi <davidel@xmailserver.org>
+ *
+ */
+
+#include "xinclude.h"
+
+
+
+#define XDL_GUESS_NLINES 256
+
+
+
+
+int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize,
+ xdemitcb_t *ecb) {
+ mmbuffer_t mb[3];
+ int i;
+
+ mb[0].ptr = (char *) pre;
+ mb[0].size = psize;
+ mb[1].ptr = (char *) rec;
+ mb[1].size = size;
+ i = 2;
+
+ if (!size || rec[size-1] != '\n') {
+ mb[2].ptr = "\n\\ No newline at end of file\n";
+ mb[2].size = strlen(mb[2].ptr);
+ i = 3;
+ }
+
+ if (ecb->outf(ecb->priv, mb, i) < 0) {
+
+ return -1;
+ }
+
+ return 0;
+}
+
+void *xdl_mmfile_first(mmfile_t *mmf, long *size)
+{
+ *size = mmf->size;
+ return mmf->ptr;
+}
+
+
+void *xdl_mmfile_next(mmfile_t *mmf, long *size)
+{
+ return NULL;
+}
+
+
+long xdl_mmfile_size(mmfile_t *mmf)
+{
+ return mmf->size;
+}
+
+
+int xdl_cha_init(chastore_t *cha, long isize, long icount) {
+
+ cha->head = cha->tail = NULL;
+ cha->isize = isize;
+ cha->nsize = icount * isize;
+ cha->ancur = cha->sncur = NULL;
+ cha->scurr = 0;
+
+ return 0;
+}
+
+
+void xdl_cha_free(chastore_t *cha) {
+ chanode_t *cur, *tmp;
+
+ for (cur = cha->head; (tmp = cur) != NULL;) {
+ cur = cur->next;
+ xdl_free(tmp);
+ }
+}
+
+
+void *xdl_cha_alloc(chastore_t *cha) {
+ chanode_t *ancur;
+ void *data;
+
+ if (!(ancur = cha->ancur) || ancur->icurr == cha->nsize) {
+ if (!(ancur = (chanode_t *) xdl_malloc(sizeof(chanode_t) + cha->nsize))) {
+
+ return NULL;
+ }
+ ancur->icurr = 0;
+ ancur->next = NULL;
+ if (cha->tail)
+ cha->tail->next = ancur;
+ if (!cha->head)
+ cha->head = ancur;
+ cha->tail = ancur;
+ cha->ancur = ancur;
+ }
+
+ data = (char *) ancur + sizeof(chanode_t) + ancur->icurr;
+ ancur->icurr += cha->isize;
+
+ return data;
+}
+
+
+void *xdl_cha_first(chastore_t *cha) {
+ chanode_t *sncur;
+
+ if (!(cha->sncur = sncur = cha->head))
+ return NULL;
+
+ cha->scurr = 0;
+
+ return (char *) sncur + sizeof(chanode_t) + cha->scurr;
+}
+
+
+void *xdl_cha_next(chastore_t *cha) {
+ chanode_t *sncur;
+
+ if (!(sncur = cha->sncur))
+ return NULL;
+ cha->scurr += cha->isize;
+ if (cha->scurr == sncur->icurr) {
+ if (!(sncur = cha->sncur = sncur->next))
+ return NULL;
+ cha->scurr = 0;
+ }
+
+ return (char *) sncur + sizeof(chanode_t) + cha->scurr;
+}
+
+
+long xdl_guess_lines(mmfile_t *mf) {
+ long nl = 0, size, tsize = 0;
+ char const *data, *cur, *top;
+
+ if ((cur = data = xdl_mmfile_first(mf, &size)) != NULL) {
+ for (top = data + size; nl < XDL_GUESS_NLINES;) {
+ if (cur >= top) {
+ tsize += (long) (cur - data);
+ if (!(cur = data = xdl_mmfile_next(mf, &size)))
+ break;
+ top = data + size;
+ }
+ nl++;
+ if (!(cur = memchr(cur, '\n', top - cur)))
+ cur = top;
+ else
+ cur++;
+ }
+ tsize += (long) (cur - data);
+ }
+
+ if (nl && tsize)
+ nl = xdl_mmfile_size(mf) / (tsize / nl);
+
+ return nl + 1;
+}
+
+
+unsigned long xdl_hash_record(char const **data, char const *top) {
+ unsigned long ha = 5381;
+ char const *ptr = *data;
+
+ for (; ptr < top && *ptr != '\n'; ptr++) {
+ ha += (ha << 5);
+ ha ^= (unsigned long) *ptr;
+ }
+ *data = ptr < top ? ptr + 1: ptr;
+
+ return ha;
+}
+
+
+unsigned int xdl_hashbits(unsigned int size) {
+ unsigned int val = 1, bits = 0;
+
+ for (; val < size && bits < CHAR_BIT * sizeof(unsigned int); val <<= 1, bits++);
+ return bits ? bits: 1;
+}
+
+
+int xdl_num_out(char *out, long val) {
+ char *ptr, *str = out;
+ char buf[32];
+
+ ptr = buf + sizeof(buf) - 1;
+ *ptr = '\0';
+ if (val < 0) {
+ *--ptr = '-';
+ val = -val;
+ }
+ for (; val && ptr > buf; val /= 10)
+ *--ptr = "0123456789"[val % 10];
+ if (*ptr)
+ for (; *ptr; ptr++, str++)
+ *str = *ptr;
+ else
+ *str++ = '0';
+ *str = '\0';
+
+ return str - out;
+}
+
+
+long xdl_atol(char const *str, char const **next) {
+ long val, base;
+ char const *top;
+
+ for (top = str; XDL_ISDIGIT(*top); top++);
+ if (next)
+ *next = top;
+ for (val = 0, base = 1, top--; top >= str; top--, base *= 10)
+ val += base * (long)(*top - '0');
+ return val;
+}
+
+
+int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2, xdemitcb_t *ecb) {
+ int nb = 0;
+ mmbuffer_t mb;
+ char buf[128];
+
+ memcpy(buf, "@@ -", 4);
+ nb += 4;
+
+ nb += xdl_num_out(buf + nb, c1 ? s1: 0);
+
+ if (c1 != 1) {
+ memcpy(buf + nb, ",", 1);
+ nb += 1;
+
+ nb += xdl_num_out(buf + nb, c1);
+ }
+
+ memcpy(buf + nb, " +", 2);
+ nb += 2;
+
+ nb += xdl_num_out(buf + nb, c2 ? s2: 0);
+
+ if (c2 != 1) {
+ memcpy(buf + nb, ",", 1);
+ nb += 1;
+
+ nb += xdl_num_out(buf + nb, c2);
+ }
+
+ memcpy(buf + nb, " @@\n", 4);
+ nb += 4;
+
+ mb.ptr = buf;
+ mb.size = nb;
+ if (ecb->outf(ecb->priv, &mb, 1) < 0)
+ return -1;
+
+ return 0;
+}
+
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