зеркало из https://github.com/microsoft/git.git
384 строки
7.6 KiB
C
384 строки
7.6 KiB
C
/*
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* LibXDiff by Davide Libenzi ( File Differential Library )
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* Copyright (C) 2003 Davide Libenzi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Davide Libenzi <davidel@xmailserver.org>
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*
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*/
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#include "xinclude.h"
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#define XDL_GUESS_NLINES 256
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long xdl_bogosqrt(long n) {
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long i;
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/*
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* Classical integer square root approximation using shifts.
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*/
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for (i = 1; n > 0; n >>= 2)
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i <<= 1;
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return i;
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}
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int xdl_emit_diffrec(char const *rec, long size, char const *pre, long psize,
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xdemitcb_t *ecb) {
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int i = 2;
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mmbuffer_t mb[3];
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mb[0].ptr = (char *) pre;
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mb[0].size = psize;
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mb[1].ptr = (char *) rec;
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mb[1].size = size;
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if (size > 0 && rec[size - 1] != '\n') {
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mb[2].ptr = (char *) "\n\\ No newline at end of file\n";
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mb[2].size = strlen(mb[2].ptr);
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i++;
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}
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if (ecb->outf(ecb->priv, mb, i) < 0) {
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return -1;
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}
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return 0;
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}
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void *xdl_mmfile_first(mmfile_t *mmf, long *size)
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{
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*size = mmf->size;
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return mmf->ptr;
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}
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void *xdl_mmfile_next(mmfile_t *mmf, long *size)
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{
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return NULL;
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}
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long xdl_mmfile_size(mmfile_t *mmf)
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{
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return mmf->size;
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}
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int xdl_cha_init(chastore_t *cha, long isize, long icount) {
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cha->head = cha->tail = NULL;
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cha->isize = isize;
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cha->nsize = icount * isize;
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cha->ancur = cha->sncur = NULL;
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cha->scurr = 0;
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return 0;
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}
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void xdl_cha_free(chastore_t *cha) {
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chanode_t *cur, *tmp;
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for (cur = cha->head; (tmp = cur) != NULL;) {
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cur = cur->next;
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xdl_free(tmp);
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}
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}
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void *xdl_cha_alloc(chastore_t *cha) {
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chanode_t *ancur;
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void *data;
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if (!(ancur = cha->ancur) || ancur->icurr == cha->nsize) {
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if (!(ancur = (chanode_t *) xdl_malloc(sizeof(chanode_t) + cha->nsize))) {
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return NULL;
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}
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ancur->icurr = 0;
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ancur->next = NULL;
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if (cha->tail)
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cha->tail->next = ancur;
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if (!cha->head)
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cha->head = ancur;
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cha->tail = ancur;
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cha->ancur = ancur;
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}
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data = (char *) ancur + sizeof(chanode_t) + ancur->icurr;
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ancur->icurr += cha->isize;
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return data;
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}
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void *xdl_cha_first(chastore_t *cha) {
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chanode_t *sncur;
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if (!(cha->sncur = sncur = cha->head))
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return NULL;
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cha->scurr = 0;
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return (char *) sncur + sizeof(chanode_t) + cha->scurr;
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}
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void *xdl_cha_next(chastore_t *cha) {
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chanode_t *sncur;
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if (!(sncur = cha->sncur))
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return NULL;
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cha->scurr += cha->isize;
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if (cha->scurr == sncur->icurr) {
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if (!(sncur = cha->sncur = sncur->next))
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return NULL;
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cha->scurr = 0;
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}
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return (char *) sncur + sizeof(chanode_t) + cha->scurr;
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}
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long xdl_guess_lines(mmfile_t *mf) {
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long nl = 0, size, tsize = 0;
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char const *data, *cur, *top;
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if ((cur = data = xdl_mmfile_first(mf, &size)) != NULL) {
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for (top = data + size; nl < XDL_GUESS_NLINES;) {
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if (cur >= top) {
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tsize += (long) (cur - data);
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if (!(cur = data = xdl_mmfile_next(mf, &size)))
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break;
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top = data + size;
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}
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nl++;
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if (!(cur = memchr(cur, '\n', top - cur)))
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cur = top;
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else
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cur++;
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}
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tsize += (long) (cur - data);
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}
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if (nl && tsize)
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nl = xdl_mmfile_size(mf) / (tsize / nl);
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return nl + 1;
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}
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int xdl_recmatch(const char *l1, long s1, const char *l2, long s2, long flags)
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{
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int i1, i2;
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if (flags & XDF_IGNORE_WHITESPACE) {
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for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) {
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if (isspace(l1[i1]))
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while (isspace(l1[i1]) && i1 < s1)
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i1++;
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if (isspace(l2[i2]))
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while (isspace(l2[i2]) && i2 < s2)
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i2++;
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if (i1 < s1 && i2 < s2 && l1[i1++] != l2[i2++])
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return 0;
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}
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return (i1 >= s1 && i2 >= s2);
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} else if (flags & XDF_IGNORE_WHITESPACE_CHANGE) {
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for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) {
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if (isspace(l1[i1])) {
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if (!isspace(l2[i2]))
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return 0;
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while (isspace(l1[i1]) && i1 < s1)
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i1++;
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while (isspace(l2[i2]) && i2 < s2)
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i2++;
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} else if (l1[i1++] != l2[i2++])
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return 0;
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}
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return (i1 >= s1 && i2 >= s2);
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} else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL) {
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for (i1 = i2 = 0; i1 < s1 && i2 < s2; ) {
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if (l1[i1] != l2[i2]) {
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while (i1 < s1 && isspace(l1[i1]))
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i1++;
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while (i2 < s2 && isspace(l2[i2]))
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i2++;
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if (i1 < s1 || i2 < s2)
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return 0;
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return 1;
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}
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i1++;
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i2++;
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}
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return i1 >= s1 && i2 >= s2;
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} else
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return s1 == s2 && !memcmp(l1, l2, s1);
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return 0;
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}
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static unsigned long xdl_hash_record_with_whitespace(char const **data,
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char const *top, long flags) {
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unsigned long ha = 5381;
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char const *ptr = *data;
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for (; ptr < top && *ptr != '\n'; ptr++) {
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if (isspace(*ptr)) {
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const char *ptr2 = ptr;
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while (ptr + 1 < top && isspace(ptr[1])
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&& ptr[1] != '\n')
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ptr++;
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if (flags & XDF_IGNORE_WHITESPACE_CHANGE
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&& ptr[1] != '\n') {
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ha += (ha << 5);
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ha ^= (unsigned long) ' ';
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}
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if (flags & XDF_IGNORE_WHITESPACE_AT_EOL
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&& ptr[1] != '\n') {
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while (ptr2 != ptr + 1) {
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ha += (ha << 5);
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ha ^= (unsigned long) *ptr2;
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ptr2++;
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}
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}
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continue;
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}
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ha += (ha << 5);
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ha ^= (unsigned long) *ptr;
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}
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*data = ptr < top ? ptr + 1: ptr;
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return ha;
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}
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unsigned long xdl_hash_record(char const **data, char const *top, long flags) {
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unsigned long ha = 5381;
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char const *ptr = *data;
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if (flags & XDF_WHITESPACE_FLAGS)
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return xdl_hash_record_with_whitespace(data, top, flags);
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for (; ptr < top && *ptr != '\n'; ptr++) {
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ha += (ha << 5);
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ha ^= (unsigned long) *ptr;
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}
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*data = ptr < top ? ptr + 1: ptr;
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return ha;
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}
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unsigned int xdl_hashbits(unsigned int size) {
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unsigned int val = 1, bits = 0;
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for (; val < size && bits < CHAR_BIT * sizeof(unsigned int); val <<= 1, bits++);
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return bits ? bits: 1;
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}
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int xdl_num_out(char *out, long val) {
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char *ptr, *str = out;
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char buf[32];
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ptr = buf + sizeof(buf) - 1;
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*ptr = '\0';
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if (val < 0) {
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*--ptr = '-';
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val = -val;
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}
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for (; val && ptr > buf; val /= 10)
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*--ptr = "0123456789"[val % 10];
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if (*ptr)
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for (; *ptr; ptr++, str++)
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*str = *ptr;
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else
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*str++ = '0';
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*str = '\0';
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return str - out;
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}
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long xdl_atol(char const *str, char const **next) {
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long val, base;
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char const *top;
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for (top = str; XDL_ISDIGIT(*top); top++);
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if (next)
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*next = top;
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for (val = 0, base = 1, top--; top >= str; top--, base *= 10)
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val += base * (long)(*top - '0');
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return val;
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}
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int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
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const char *func, long funclen, xdemitcb_t *ecb) {
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int nb = 0;
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mmbuffer_t mb;
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char buf[128];
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memcpy(buf, "@@ -", 4);
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nb += 4;
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nb += xdl_num_out(buf + nb, c1 ? s1: s1 - 1);
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if (c1 != 1) {
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memcpy(buf + nb, ",", 1);
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nb += 1;
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nb += xdl_num_out(buf + nb, c1);
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}
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memcpy(buf + nb, " +", 2);
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nb += 2;
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nb += xdl_num_out(buf + nb, c2 ? s2: s2 - 1);
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if (c2 != 1) {
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memcpy(buf + nb, ",", 1);
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nb += 1;
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nb += xdl_num_out(buf + nb, c2);
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}
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memcpy(buf + nb, " @@", 3);
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nb += 3;
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if (func && funclen) {
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buf[nb++] = ' ';
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if (funclen > sizeof(buf) - nb - 1)
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funclen = sizeof(buf) - nb - 1;
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memcpy(buf + nb, func, funclen);
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nb += funclen;
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}
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buf[nb++] = '\n';
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mb.ptr = buf;
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mb.size = nb;
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if (ecb->outf(ecb->priv, &mb, 1) < 0)
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return -1;
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return 0;
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}
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