diff options
Diffstat (limited to 'xdiff-interface.c')
| -rw-r--r-- | xdiff-interface.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/xdiff-interface.c b/xdiff-interface.c new file mode 100644 index 0000000000..8509f9ea22 --- /dev/null +++ b/xdiff-interface.c @@ -0,0 +1,319 @@ +#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 void consume_one(void *priv_, char *s, unsigned long size) +{ + struct xdiff_emit_state *priv = priv_; + char *ep; + while (size) { + unsigned long this_size; + ep = memchr(s, '\n', size); + this_size = (ep == NULL) ? size : (ep - s + 1); + priv->line_fn(priv->consume_callback_data, s, this_size); + size -= this_size; + s += this_size; + } +} + +static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf) +{ + struct xdiff_emit_state *priv = priv_; + int i; + + if (!priv->line_fn) + return 0; + + for (i = 0; i < nbuf; i++) { + 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) { + consume_one(priv, mb[i].ptr, mb[i].size); + continue; + } + strbuf_add(&priv->remainder, mb[i].ptr, mb[i].size); + consume_one(priv, priv->remainder.buf, priv->remainder.len); + strbuf_reset(&priv->remainder); + } + if (priv->remainder.len) { + consume_one(priv, priv->remainder.buf, priv->remainder.len); + strbuf_reset(&priv->remainder); + } + 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->ptr + a->size; + char *bp = b->ptr + b->size; + 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); +} + +void discard_hunk_line(void *priv, + long ob, long on, long nb, long nn, + const char *func, long funclen) +{ +} + +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 = strchr(value, '\n'), *expression; + char *buffer = NULL; + + 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 + 1; + } +} + +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); +} |