mirror of
https://github.com/git/git.git
synced 2024-11-25 19:04:18 +08:00
363 lines
8.2 KiB
C
363 lines
8.2 KiB
C
#include "cache.h"
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#include "xdiff-interface.h"
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#include "xdiff/xtypes.h"
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#include "xdiff/xdiffi.h"
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#include "xdiff/xemit.h"
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#include "xdiff/xmacros.h"
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struct xdiff_emit_state {
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xdiff_emit_consume_fn consume;
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void *consume_callback_data;
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struct strbuf remainder;
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};
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static int parse_num(char **cp_p, int *num_p)
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{
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char *cp = *cp_p;
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int num = 0;
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while ('0' <= *cp && *cp <= '9')
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num = num * 10 + *cp++ - '0';
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if (!(cp - *cp_p))
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return -1;
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*cp_p = cp;
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*num_p = num;
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return 0;
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}
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int parse_hunk_header(char *line, int len,
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int *ob, int *on,
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int *nb, int *nn)
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{
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char *cp;
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cp = line + 4;
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if (parse_num(&cp, ob)) {
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bad_line:
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return error("malformed diff output: %s", line);
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}
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, on))
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goto bad_line;
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}
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else
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*on = 1;
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if (*cp++ != ' ' || *cp++ != '+')
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goto bad_line;
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if (parse_num(&cp, nb))
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goto bad_line;
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if (*cp == ',') {
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cp++;
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if (parse_num(&cp, nn))
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goto bad_line;
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}
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else
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*nn = 1;
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return -!!memcmp(cp, " @@", 3);
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}
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static void consume_one(void *priv_, char *s, unsigned long size)
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{
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struct xdiff_emit_state *priv = priv_;
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char *ep;
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while (size) {
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unsigned long this_size;
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ep = memchr(s, '\n', size);
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this_size = (ep == NULL) ? size : (ep - s + 1);
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priv->consume(priv->consume_callback_data, s, this_size);
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size -= this_size;
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s += this_size;
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}
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}
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static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
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{
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struct xdiff_emit_state *priv = priv_;
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int i;
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for (i = 0; i < nbuf; i++) {
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if (mb[i].ptr[mb[i].size-1] != '\n') {
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/* Incomplete line */
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strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size);
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continue;
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}
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/* we have a complete line */
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if (!priv->remainder.len) {
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consume_one(priv, mb[i].ptr, mb[i].size);
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continue;
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}
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strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size);
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consume_one(priv, priv->remainder.buf, priv->remainder.len);
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strbuf_reset(&priv->remainder);
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}
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if (priv->remainder.len) {
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consume_one(priv, priv->remainder.buf, priv->remainder.len);
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strbuf_reset(&priv->remainder);
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}
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return 0;
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}
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/*
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* Trim down common substring at the end of the buffers,
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* but leave at least ctx lines at the end.
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*/
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static void trim_common_tail(mmfile_t *a, mmfile_t *b, long ctx)
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{
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const int blk = 1024;
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long trimmed = 0, recovered = 0;
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char *ap = a->ptr + a->size;
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char *bp = b->ptr + b->size;
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long smaller = (a->size < b->size) ? a->size : b->size;
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if (ctx)
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return;
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while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) {
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trimmed += blk;
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ap -= blk;
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bp -= blk;
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}
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while (recovered < trimmed)
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if (ap[recovered++] == '\n')
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break;
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a->size -= trimmed - recovered;
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b->size -= trimmed - recovered;
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}
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int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *xecb)
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{
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mmfile_t a = *mf1;
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mmfile_t b = *mf2;
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trim_common_tail(&a, &b, xecfg->ctxlen);
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return xdl_diff(&a, &b, xpp, xecfg, xecb);
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}
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int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
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xdiff_emit_consume_fn fn, void *consume_callback_data,
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xpparam_t const *xpp, xdemitconf_t const *xecfg)
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{
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int ret;
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struct xdiff_emit_state state;
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xdemitcb_t ecb;
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memset(&state, 0, sizeof(state));
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state.consume = fn;
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state.consume_callback_data = consume_callback_data;
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memset(&ecb, 0, sizeof(ecb));
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ecb.outf = xdiff_outf;
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ecb.priv = &state;
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strbuf_init(&state.remainder, 0);
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ret = xdi_diff(mf1, mf2, xpp, xecfg, &ecb);
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strbuf_release(&state.remainder);
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return ret;
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}
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struct xdiff_emit_hunk_state {
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xdiff_emit_hunk_consume_fn consume;
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void *consume_callback_data;
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};
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static int process_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
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xdemitconf_t const *xecfg)
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{
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long s1, s2, same, p_next, t_next;
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xdchange_t *xch, *xche;
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struct xdiff_emit_hunk_state *state = ecb->priv;
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xdiff_emit_hunk_consume_fn fn = state->consume;
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void *consume_callback_data = state->consume_callback_data;
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for (xch = xscr; xch; xch = xche->next) {
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xche = xdl_get_hunk(xch, xecfg);
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s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
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s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
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same = s2 + XDL_MAX(xch->i1 - s1, 0);
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p_next = xche->i1 + xche->chg1;
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t_next = xche->i2 + xche->chg2;
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fn(consume_callback_data, same, p_next, t_next);
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}
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return 0;
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}
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int xdi_diff_hunks(mmfile_t *mf1, mmfile_t *mf2,
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xdiff_emit_hunk_consume_fn fn, void *consume_callback_data,
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xpparam_t const *xpp, xdemitconf_t *xecfg)
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{
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struct xdiff_emit_hunk_state state;
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xdemitcb_t ecb;
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memset(&state, 0, sizeof(state));
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memset(&ecb, 0, sizeof(ecb));
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state.consume = fn;
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state.consume_callback_data = consume_callback_data;
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xecfg->emit_func = (void (*)())process_diff;
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ecb.priv = &state;
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return xdi_diff(mf1, mf2, xpp, xecfg, &ecb);
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}
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int read_mmfile(mmfile_t *ptr, const char *filename)
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{
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struct stat st;
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FILE *f;
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size_t sz;
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if (stat(filename, &st))
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return error("Could not stat %s", filename);
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if ((f = fopen(filename, "rb")) == NULL)
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return error("Could not open %s", filename);
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sz = xsize_t(st.st_size);
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ptr->ptr = xmalloc(sz ? sz : 1);
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if (sz && fread(ptr->ptr, sz, 1, f) != 1)
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return error("Could not read %s", filename);
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fclose(f);
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ptr->size = sz;
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return 0;
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}
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void read_mmblob(mmfile_t *ptr, const unsigned char *sha1)
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{
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unsigned long size;
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enum object_type type;
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if (!hashcmp(sha1, null_sha1)) {
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ptr->ptr = xstrdup("");
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ptr->size = 0;
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return;
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}
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ptr->ptr = read_sha1_file(sha1, &type, &size);
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if (!ptr->ptr || type != OBJ_BLOB)
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die("unable to read blob object %s", sha1_to_hex(sha1));
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ptr->size = size;
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}
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#define FIRST_FEW_BYTES 8000
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int buffer_is_binary(const char *ptr, unsigned long size)
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{
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if (FIRST_FEW_BYTES < size)
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size = FIRST_FEW_BYTES;
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return !!memchr(ptr, 0, size);
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}
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struct ff_regs {
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int nr;
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struct ff_reg {
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regex_t re;
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int negate;
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} *array;
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};
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static long ff_regexp(const char *line, long len,
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char *buffer, long buffer_size, void *priv)
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{
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char *line_buffer;
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struct ff_regs *regs = priv;
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regmatch_t pmatch[2];
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int i;
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int result = -1;
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/* Exclude terminating newline (and cr) from matching */
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if (len > 0 && line[len-1] == '\n') {
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if (len > 1 && line[len-2] == '\r')
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len -= 2;
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else
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len--;
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}
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line_buffer = xstrndup(line, len); /* make NUL terminated */
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for (i = 0; i < regs->nr; i++) {
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struct ff_reg *reg = regs->array + i;
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if (!regexec(®->re, line_buffer, 2, pmatch, 0)) {
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if (reg->negate)
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goto fail;
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break;
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}
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}
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if (regs->nr <= i)
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goto fail;
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i = pmatch[1].rm_so >= 0 ? 1 : 0;
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line += pmatch[i].rm_so;
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result = pmatch[i].rm_eo - pmatch[i].rm_so;
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if (result > buffer_size)
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result = buffer_size;
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else
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while (result > 0 && (isspace(line[result - 1])))
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result--;
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memcpy(buffer, line, result);
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fail:
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free(line_buffer);
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return result;
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}
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void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value, int cflags)
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{
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int i;
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struct ff_regs *regs;
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xecfg->find_func = ff_regexp;
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regs = xecfg->find_func_priv = xmalloc(sizeof(struct ff_regs));
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for (i = 0, regs->nr = 1; value[i]; i++)
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if (value[i] == '\n')
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regs->nr++;
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regs->array = xmalloc(regs->nr * sizeof(struct ff_reg));
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for (i = 0; i < regs->nr; i++) {
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struct ff_reg *reg = regs->array + i;
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const char *ep = strchr(value, '\n'), *expression;
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char *buffer = NULL;
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reg->negate = (*value == '!');
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if (reg->negate && i == regs->nr - 1)
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die("Last expression must not be negated: %s", value);
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if (*value == '!')
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value++;
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if (ep)
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expression = buffer = xstrndup(value, ep - value);
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else
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expression = value;
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if (regcomp(®->re, expression, cflags))
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die("Invalid regexp to look for hunk header: %s", expression);
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free(buffer);
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value = ep + 1;
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}
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}
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void xdiff_clear_find_func(xdemitconf_t *xecfg)
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{
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if (xecfg->find_func) {
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int i;
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struct ff_regs *regs = xecfg->find_func_priv;
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for (i = 0; i < regs->nr; i++)
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regfree(®s->array[i].re);
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free(regs->array);
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free(regs);
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xecfg->find_func = NULL;
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xecfg->find_func_priv = NULL;
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}
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}
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int git_xmerge_style = -1;
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int git_xmerge_config(const char *var, const char *value, void *cb)
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{
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if (!strcasecmp(var, "merge.conflictstyle")) {
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if (!value)
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die("'%s' is not a boolean", var);
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if (!strcmp(value, "diff3"))
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git_xmerge_style = XDL_MERGE_DIFF3;
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else if (!strcmp(value, "merge"))
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git_xmerge_style = 0;
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else
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die("unknown style '%s' given for '%s'",
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value, var);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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