From f23fc773a2acce9966ac7fa267818d5be55667fa Mon Sep 17 00:00:00 2001 From: Junio C Hamano Date: Mon, 3 Apr 2006 18:53:15 -0700 Subject: [PATCH] combine-diff: use built-in xdiff. Now there is no GNU diff invocations, except the one from blame.c Signed-off-by: Junio C Hamano --- combine-diff.c | 238 ++++++++++++++++++++++++++++--------------------- 1 file changed, 136 insertions(+), 102 deletions(-) diff --git a/combine-diff.c b/combine-diff.c index 7693884fdb..11f5143eec 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -4,6 +4,7 @@ #include "diff.h" #include "diffcore.h" #include "quote.h" +#include "xdiff/xdiff.h" static int uninteresting(struct diff_filepair *p) { @@ -110,28 +111,6 @@ static char *grab_blob(const unsigned char *sha1, unsigned long *size) return blob; } -#define TMPPATHLEN 50 -#define MAXLINELEN 10240 - -static void write_to_temp_file(char *tmpfile, void *blob, unsigned long size) -{ - int fd = git_mkstemp(tmpfile, TMPPATHLEN, ".diff_XXXXXX"); - if (fd < 0) - die("unable to create temp-file"); - if (write(fd, blob, size) != size) - die("unable to write temp-file"); - close(fd); -} - -static void write_temp_blob(char *tmpfile, const unsigned char *sha1) -{ - unsigned long size; - void *blob; - blob = grab_blob(sha1, &size); - write_to_temp_file(tmpfile, blob, size); - free(blob); -} - static int parse_num(char **cp_p, unsigned int *num_p) { char *cp = *cp_p; @@ -178,10 +157,9 @@ static int parse_hunk_header(char *line, int len, return -!!memcmp(cp, " @@", 3); } -static void append_lost(struct sline *sline, int n, const char *line) +static void append_lost(struct sline *sline, int n, const char *line, int len) { struct lline *lline; - int len = strlen(line); unsigned long this_mask = (1UL<lost_tail = &lline->next; } -static void combine_diff(const unsigned char *parent, const char *ourtmp, +struct combine_diff_state { + char *remainder; + unsigned long remainder_size; + unsigned int lno, ob, on, nb, nn; + unsigned long nmask; + int num_parent; + int n; + struct sline *sline; + struct sline *lost_bucket; +}; + +static void consume_line(struct combine_diff_state *state, + char *line, + unsigned long len) +{ + if (5 < len && !memcmp("@@ -", line, 4)) { + if (parse_hunk_header(line, len, + &state->ob, &state->on, + &state->nb, &state->nn)) + return; + state->lno = state->nb; + if (!state->nb) + /* @@ -1,2 +0,0 @@ to remove the + * first two lines... + */ + state->nb = 1; + if (state->nn == 0) + /* @@ -X,Y +N,0 @@ removed Y lines + * that would have come *after* line N + * in the result. Our lost buckets hang + * to the line after the removed lines, + */ + state->lost_bucket = &state->sline[state->nb]; + else + state->lost_bucket = &state->sline[state->nb-1]; + if (!state->sline[state->nb-1].p_lno) + state->sline[state->nb-1].p_lno = + xcalloc(state->num_parent, + sizeof(unsigned long)); + state->sline[state->nb-1].p_lno[state->n] = state->ob; + return; + } + if (!state->lost_bucket) + return; /* not in any hunk yet */ + switch (line[0]) { + case '-': + append_lost(state->lost_bucket, state->n, line+1, len-1); + break; + case '+': + state->sline[state->lno-1].flag |= state->nmask; + state->lno++; + break; + } +} + +static int combine_diff_outf(void *priv_, mmbuffer_t *mb, int nbuf) +{ + struct combine_diff_state *priv = priv_; + int i; + for (i = 0; i < nbuf; i++) { + if (mb[i].ptr[mb[i].size-1] != '\n') { + /* Incomplete line */ + priv->remainder = realloc(priv->remainder, + priv->remainder_size + + mb[i].size); + memcpy(priv->remainder + priv->remainder_size, + mb[i].ptr, mb[i].size); + priv->remainder_size += mb[i].size; + continue; + } + + /* we have a complete line */ + if (!priv->remainder) { + consume_line(priv, mb[i].ptr, mb[i].size); + continue; + } + priv->remainder = realloc(priv->remainder, + priv->remainder_size + + mb[i].size); + memcpy(priv->remainder + priv->remainder_size, + mb[i].ptr, mb[i].size); + consume_line(priv, priv->remainder, + priv->remainder_size + mb[i].size); + free(priv->remainder); + priv->remainder = NULL; + priv->remainder_size = 0; + } + return 0; +} + +static void combine_diff(const unsigned char *parent, mmfile_t *result_file, struct sline *sline, int cnt, int n, int num_parent) { - FILE *in; - char parent_tmp[TMPPATHLEN]; - char cmd[TMPPATHLEN * 2 + 1024]; - char line[MAXLINELEN]; - unsigned int lno, ob, on, nb, nn, p_lno; + unsigned int p_lno, lno; unsigned long nmask = (1UL << n); - struct sline *lost_bucket = NULL; + xpparam_t xpp; + xdemitconf_t xecfg; + mmfile_t parent_file; + xdemitcb_t ecb; + struct combine_diff_state state; + unsigned long sz; if (!cnt) return; /* result deleted */ - write_temp_blob(parent_tmp, parent); - sprintf(cmd, "diff --unified=0 -La/x -Lb/x '%s' '%s'", - parent_tmp, ourtmp); - in = popen(cmd, "r"); - if (!in) - die("cannot spawn %s", cmd); - - lno = 1; - while (fgets(line, sizeof(line), in) != NULL) { - int len = strlen(line); - if (5 < len && !memcmp("@@ -", line, 4)) { - if (parse_hunk_header(line, len, - &ob, &on, &nb, &nn)) - break; - lno = nb; - if (!nb) - /* @@ -1,2 +0,0 @@ to remove the - * first two lines... - */ - nb = 1; - if (nn == 0) - /* @@ -X,Y +N,0 @@ removed Y lines - * that would have come *after* line N - * in the result. Our lost buckets hang - * to the line after the removed lines, - */ - lost_bucket = &sline[nb]; - else - lost_bucket = &sline[nb-1]; - if (!sline[nb-1].p_lno) - sline[nb-1].p_lno = - xcalloc(num_parent, - sizeof(unsigned long)); - sline[nb-1].p_lno[n] = ob; - continue; - } - if (!lost_bucket) - continue; /* not in any hunk yet */ - switch (line[0]) { - case '-': - append_lost(lost_bucket, n, line+1); - break; - case '+': - sline[lno-1].flag |= nmask; - lno++; - break; - } - } - fclose(in); - unlink(parent_tmp); + parent_file.ptr = grab_blob(parent, &sz); + parent_file.size = sz; + xpp.flags = XDF_NEED_MINIMAL; + xecfg.ctxlen = 0; + xecfg.flags = 0; + ecb.outf = combine_diff_outf; + ecb.priv = &state; + memset(&state, 0, sizeof(state)); + state.nmask = nmask; + state.sline = sline; + state.lno = 1; + state.num_parent = num_parent; + state.n = n; + + xdl_diff(&parent_file, result_file, &xpp, &xecfg, &ecb); + if (state.remainder && state.remainder_size) + consume_line(&state, state.remainder, state.remainder_size); + free(state.remainder); + free(parent_file.ptr); /* Assign line numbers for this parent. * @@ -625,61 +663,56 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent, int dense, const char *header, struct diff_options *opt) { - unsigned long size, cnt, lno; + unsigned long result_size, cnt, lno; char *result, *cp, *ep; struct sline *sline; /* survived lines */ int mode_differs = 0; int i, show_hunks, shown_header = 0; - char ourtmp_buf[TMPPATHLEN]; - char *ourtmp = ourtmp_buf; int working_tree_file = !memcmp(elem->sha1, null_sha1, 20); int abbrev = opt->full_index ? 40 : DEFAULT_ABBREV; + mmfile_t result_file; /* Read the result of merge first */ - if (!working_tree_file) { - result = grab_blob(elem->sha1, &size); - write_to_temp_file(ourtmp, result, size); - } + if (!working_tree_file) + result = grab_blob(elem->sha1, &result_size); else { /* Used by diff-tree to read from the working tree */ struct stat st; int fd; - ourtmp = elem->path; - if (0 <= (fd = open(ourtmp, O_RDONLY)) && + if (0 <= (fd = open(elem->path, O_RDONLY)) && !fstat(fd, &st)) { int len = st.st_size; int cnt = 0; elem->mode = canon_mode(st.st_mode); - size = len; + result_size = len; result = xmalloc(len + 1); while (cnt < len) { int done = xread(fd, result+cnt, len-cnt); if (done == 0) break; if (done < 0) - die("read error '%s'", ourtmp); + die("read error '%s'", elem->path); cnt += done; } result[len] = 0; } else { /* deleted file */ - size = 0; + result_size = 0; elem->mode = 0; result = xmalloc(1); result[0] = 0; - ourtmp = "/dev/null"; } if (0 <= fd) close(fd); } - for (cnt = 0, cp = result; cp - result < size; cp++) { + for (cnt = 0, cp = result; cp - result < result_size; cp++) { if (*cp == '\n') cnt++; } - if (size && result[size-1] != '\n') + if (result_size && result[result_size-1] != '\n') cnt++; /* incomplete line */ sline = xcalloc(cnt+1, sizeof(*sline)); @@ -689,7 +722,7 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent, sline[lno].lost_tail = &sline[lno].lost_head; sline[lno].flag = 0; } - for (lno = 0, cp = result; cp - result < size; cp++) { + for (lno = 0, cp = result; cp - result < result_size; cp++) { if (*cp == '\n') { sline[lno].len = cp - sline[lno].bol; lno++; @@ -697,8 +730,11 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent, sline[lno].bol = cp + 1; } } - if (size && result[size-1] != '\n') - sline[cnt-1].len = size - (sline[cnt-1].bol - result); + if (result_size && result[result_size-1] != '\n') + sline[cnt-1].len = result_size - (sline[cnt-1].bol - result); + + result_file.ptr = result; + result_file.size = result_size; sline[0].p_lno = xcalloc((cnt+1) * num_parent, sizeof(unsigned long)); for (lno = 0; lno < cnt; lno++) @@ -714,7 +750,7 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent, } } if (i <= j) - combine_diff(elem->parent[i].sha1, ourtmp, sline, + combine_diff(elem->parent[i].sha1, &result_file, sline, cnt, i, num_parent); if (elem->parent[i].mode != elem->mode) mode_differs = 1; @@ -767,8 +803,6 @@ static int show_patch_diff(struct combine_diff_path *elem, int num_parent, } dump_sline(sline, cnt, num_parent); } - if (ourtmp == ourtmp_buf) - unlink(ourtmp); free(result); for (i = 0; i < cnt; i++) { -- 2.47.1