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| #include "cache.h" | |
| #include "config.h" | |
| #include "object-store.h" | |
| #include "xdiff-interface.h" | |
| #include "xdiff/xtypes.h" | |
| #include "xdiff/xdiffi.h" | |
| #include "xdiff/xemit.h" | |
| #include "xdiff/xmacros.h" | |
| #include "xdiff/xutils.h" | |
| struct xdiff_emit_state { | |
| xdiff_emit_hunk_fn hunk_fn; | |
| xdiff_emit_line_fn line_fn; | |
| void *consume_callback_data; | |
| struct strbuf remainder; | |
| }; | |
| static int xdiff_out_hunk(void *priv_, | |
| long old_begin, long old_nr, | |
| long new_begin, long new_nr, | |
| const char *func, long funclen) | |
| { | |
| struct xdiff_emit_state *priv = priv_; | |
| if (priv->remainder.len) | |
| BUG("xdiff emitted hunk in the middle of a line"); | |
| priv->hunk_fn(priv->consume_callback_data, | |
| old_begin, old_nr, new_begin, new_nr, | |
| func, funclen); | |
| return 0; | |
| } | |
| static int consume_one(void *priv_, char *s, unsigned long size) | |
| { | |
| struct xdiff_emit_state *priv = priv_; | |
| char *ep; | |
| while (size) { | |
| unsigned long this_size; | |
| int ret; | |
| ep = memchr(s, '\n', size); | |
| this_size = (ep == NULL) ? size : (ep - s + 1); | |
| ret = priv->line_fn(priv->consume_callback_data, s, this_size); | |
| if (ret) | |
| return ret; | |
| size -= this_size; | |
| s += this_size; | |
| } | |
| return 0; | |
| } | |
| static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf) | |
| { | |
| struct xdiff_emit_state *priv = priv_; | |
| int i; | |
| int stop = 0; | |
| if (!priv->line_fn) | |
| return 0; | |
| for (i = 0; i < nbuf; i++) { | |
| if (stop) | |
| return 1; | |
| if (mb[i].ptr[mb[i].size-1] != '\n') { | |
| /* Incomplete line */ | |
| strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); | |
| continue; | |
| } | |
| /* we have a complete line */ | |
| if (!priv->remainder.len) { | |
| stop = consume_one(priv, mb[i].ptr, mb[i].size); | |
| continue; | |
| } | |
| strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); | |
| stop = consume_one(priv, priv->remainder.buf, priv->remainder.len); | |
| strbuf_reset(&priv->remainder); | |
| } | |
| if (stop) | |
| return -1; | |
| if (priv->remainder.len) { | |
| stop = consume_one(priv, priv->remainder.buf, priv->remainder.len); | |
| strbuf_reset(&priv->remainder); | |
| } | |
| if (stop) | |
| return -1; | |
| return 0; | |
| } | |
| /* | |
| * Trim down common substring at the end of the buffers, | |
| * but end on a complete line. | |
| */ | |
| static void trim_common_tail(mmfile_t *a, mmfile_t *b) | |
| { | |
| const int blk = 1024; | |
| long trimmed = 0, recovered = 0; | |
| char *ap = a->size ? a->ptr + a->size : a->ptr; | |
| char *bp = b->size ? b->ptr + b->size : b->ptr; | |
| long smaller = (a->size < b->size) ? a->size : b->size; | |
| while (blk + trimmed <= smaller && !memcmp(ap - blk, bp - blk, blk)) { | |
| trimmed += blk; | |
| ap -= blk; | |
| bp -= blk; | |
| } | |
| while (recovered < trimmed) | |
| if (ap[recovered++] == '\n') | |
| break; | |
| a->size -= trimmed - recovered; | |
| b->size -= trimmed - recovered; | |
| } | |
| int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *xecb) | |
| { | |
| mmfile_t a = *mf1; | |
| mmfile_t b = *mf2; | |
| if (mf1->size > MAX_XDIFF_SIZE || mf2->size > MAX_XDIFF_SIZE) | |
| return -1; | |
| if (!xecfg->ctxlen && !(xecfg->flags & XDL_EMIT_FUNCCONTEXT)) | |
| trim_common_tail(&a, &b); | |
| return xdl_diff(&a, &b, xpp, xecfg, xecb); | |
| } | |
| int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2, | |
| xdiff_emit_hunk_fn hunk_fn, | |
| xdiff_emit_line_fn line_fn, | |
| void *consume_callback_data, | |
| xpparam_t const *xpp, xdemitconf_t const *xecfg) | |
| { | |
| int ret; | |
| struct xdiff_emit_state state; | |
| xdemitcb_t ecb; | |
| memset(&state, 0, sizeof(state)); | |
| state.hunk_fn = hunk_fn; | |
| state.line_fn = line_fn; | |
| state.consume_callback_data = consume_callback_data; | |
| memset(&ecb, 0, sizeof(ecb)); | |
| if (hunk_fn) | |
| ecb.out_hunk = xdiff_out_hunk; | |
| ecb.out_line = xdiff_outf; | |
| ecb.priv = &state; | |
| strbuf_init(&state.remainder, 0); | |
| ret = xdi_diff(mf1, mf2, xpp, xecfg, &ecb); | |
| strbuf_release(&state.remainder); | |
| return ret; | |
| } | |
| int read_mmfile(mmfile_t *ptr, const char *filename) | |
| { | |
| struct stat st; | |
| FILE *f; | |
| size_t sz; | |
| if (stat(filename, &st)) | |
| return error_errno("Could not stat %s", filename); | |
| if ((f = fopen(filename, "rb")) == NULL) | |
| return error_errno("Could not open %s", filename); | |
| sz = xsize_t(st.st_size); | |
| ptr->ptr = xmalloc(sz ? sz : 1); | |
| if (sz && fread(ptr->ptr, sz, 1, f) != 1) { | |
| fclose(f); | |
| return error("Could not read %s", filename); | |
| } | |
| fclose(f); | |
| ptr->size = sz; | |
| return 0; | |
| } | |
| void read_mmblob(mmfile_t *ptr, const struct object_id *oid) | |
| { | |
| unsigned long size; | |
| enum object_type type; | |
| if (oideq(oid, null_oid())) { | |
| ptr->ptr = xstrdup(""); | |
| ptr->size = 0; | |
| return; | |
| } | |
| ptr->ptr = read_object_file(oid, &type, &size); | |
| if (!ptr->ptr || type != OBJ_BLOB) | |
| die("unable to read blob object %s", oid_to_hex(oid)); | |
| ptr->size = size; | |
| } | |
| #define FIRST_FEW_BYTES 8000 | |
| int buffer_is_binary(const char *ptr, unsigned long size) | |
| { | |
| if (FIRST_FEW_BYTES < size) | |
| size = FIRST_FEW_BYTES; | |
| return !!memchr(ptr, 0, size); | |
| } | |
| struct ff_regs { | |
| int nr; | |
| struct ff_reg { | |
| regex_t re; | |
| int negate; | |
| } *array; | |
| }; | |
| static long ff_regexp(const char *line, long len, | |
| char *buffer, long buffer_size, void *priv) | |
| { | |
| struct ff_regs *regs = priv; | |
| regmatch_t pmatch[2]; | |
| int i; | |
| int result; | |
| /* Exclude terminating newline (and cr) from matching */ | |
| if (len > 0 && line[len-1] == '\n') { | |
| if (len > 1 && line[len-2] == '\r') | |
| len -= 2; | |
| else | |
| len--; | |
| } | |
| for (i = 0; i < regs->nr; i++) { | |
| struct ff_reg *reg = regs->array + i; | |
| if (!regexec_buf(®->re, line, len, 2, pmatch, 0)) { | |
| if (reg->negate) | |
| return -1; | |
| break; | |
| } | |
| } | |
| if (regs->nr <= i) | |
| return -1; | |
| i = pmatch[1].rm_so >= 0 ? 1 : 0; | |
| line += pmatch[i].rm_so; | |
| result = pmatch[i].rm_eo - pmatch[i].rm_so; | |
| if (result > buffer_size) | |
| result = buffer_size; | |
| while (result > 0 && (isspace(line[result - 1]))) | |
| result--; | |
| memcpy(buffer, line, result); | |
| return result; | |
| } | |
| void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value, int cflags) | |
| { | |
| int i; | |
| struct ff_regs *regs; | |
| xecfg->find_func = ff_regexp; | |
| regs = xecfg->find_func_priv = xmalloc(sizeof(struct ff_regs)); | |
| for (i = 0, regs->nr = 1; value[i]; i++) | |
| if (value[i] == '\n') | |
| regs->nr++; | |
| ALLOC_ARRAY(regs->array, regs->nr); | |
| for (i = 0; i < regs->nr; i++) { | |
| struct ff_reg *reg = regs->array + i; | |
| const char *ep, *expression; | |
| char *buffer = NULL; | |
| if (!value) | |
| BUG("mismatch between line count and parsing"); | |
| ep = strchr(value, '\n'); | |
| reg->negate = (*value == '!'); | |
| if (reg->negate && i == regs->nr - 1) | |
| die("Last expression must not be negated: %s", value); | |
| if (*value == '!') | |
| value++; | |
| if (ep) | |
| expression = buffer = xstrndup(value, ep - value); | |
| else | |
| expression = value; | |
| if (regcomp(®->re, expression, cflags)) | |
| die("Invalid regexp to look for hunk header: %s", expression); | |
| free(buffer); | |
| value = ep ? ep + 1 : NULL; | |
| } | |
| } | |
| void xdiff_clear_find_func(xdemitconf_t *xecfg) | |
| { | |
| if (xecfg->find_func) { | |
| int i; | |
| struct ff_regs *regs = xecfg->find_func_priv; | |
| for (i = 0; i < regs->nr; i++) | |
| regfree(®s->array[i].re); | |
| free(regs->array); | |
| free(regs); | |
| xecfg->find_func = NULL; | |
| xecfg->find_func_priv = NULL; | |
| } | |
| } | |
| unsigned long xdiff_hash_string(const char *s, size_t len, long flags) | |
| { | |
| return xdl_hash_record(&s, s + len, flags); | |
| } | |
| int xdiff_compare_lines(const char *l1, long s1, | |
| const char *l2, long s2, long flags) | |
| { | |
| return xdl_recmatch(l1, s1, l2, s2, flags); | |
| } | |
| int git_xmerge_style = -1; | |
| int git_xmerge_config(const char *var, const char *value, void *cb) | |
| { | |
| if (!strcmp(var, "merge.conflictstyle")) { | |
| if (!value) | |
| die("'%s' is not a boolean", var); | |
| if (!strcmp(value, "diff3")) | |
| git_xmerge_style = XDL_MERGE_DIFF3; | |
| else if (!strcmp(value, "merge")) | |
| git_xmerge_style = 0; | |
| /* | |
| * Please update _git_checkout() in | |
| * git-completion.bash when you add new merge config | |
| */ | |
| else | |
| die("unknown style '%s' given for '%s'", | |
| value, var); | |
| return 0; | |
| } | |
| return git_default_config(var, value, cb); | |
| } |