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synced 2024-08-24 18:26:02 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
"git grep -e '$pattern'", unlike the case where the patterns are read from a file, did not treat individual lines in the given pattern argument as separate regular expressions as it should.
1400 lines
31 KiB
C
1400 lines
31 KiB
C
#include "cache.h"
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#include "grep.h"
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#include "userdiff.h"
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#include "xdiff-interface.h"
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static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
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const char *origin, int no,
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enum grep_pat_token t,
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enum grep_header_field field)
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{
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struct grep_pat *p = xcalloc(1, sizeof(*p));
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p->pattern = xmemdupz(pat, patlen);
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p->patternlen = patlen;
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p->origin = origin;
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p->no = no;
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p->token = t;
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p->field = field;
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return p;
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}
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static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
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{
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**tail = p;
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*tail = &p->next;
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p->next = NULL;
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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for (;;) {
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struct grep_pat *new_pat;
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size_t len = 0;
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char *cp = p->pattern + p->patternlen, *nl = NULL;
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while (++len <= p->patternlen) {
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if (*(--cp) == '\n') {
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nl = cp;
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break;
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}
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}
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if (!nl)
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break;
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new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
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p->no, p->token, p->field);
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new_pat->next = p->next;
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if (!p->next)
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*tail = &new_pat->next;
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p->next = new_pat;
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*nl = '\0';
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p->patternlen -= len;
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}
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break;
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default:
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break;
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}
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}
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void append_header_grep_pattern(struct grep_opt *opt,
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enum grep_header_field field, const char *pat)
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{
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struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
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GREP_PATTERN_HEAD, field);
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do_append_grep_pat(&opt->header_tail, p);
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}
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void append_grep_pattern(struct grep_opt *opt, const char *pat,
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const char *origin, int no, enum grep_pat_token t)
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{
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append_grep_pat(opt, pat, strlen(pat), origin, no, t);
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}
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void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
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const char *origin, int no, enum grep_pat_token t)
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{
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struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
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do_append_grep_pat(&opt->pattern_tail, p);
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}
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struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
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{
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struct grep_pat *pat;
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struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
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*ret = *opt;
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ret->pattern_list = NULL;
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ret->pattern_tail = &ret->pattern_list;
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for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
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{
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if(pat->token == GREP_PATTERN_HEAD)
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append_header_grep_pattern(ret, pat->field,
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pat->pattern);
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else
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append_grep_pat(ret, pat->pattern, pat->patternlen,
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pat->origin, pat->no, pat->token);
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}
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return ret;
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}
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static NORETURN void compile_regexp_failed(const struct grep_pat *p,
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const char *error)
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{
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char where[1024];
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if (p->no)
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sprintf(where, "In '%s' at %d, ", p->origin, p->no);
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else if (p->origin)
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sprintf(where, "%s, ", p->origin);
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else
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where[0] = 0;
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die("%s'%s': %s", where, p->pattern, error);
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}
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#ifdef USE_LIBPCRE
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static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
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{
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const char *error;
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int erroffset;
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int options = PCRE_MULTILINE;
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if (opt->ignore_case)
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options |= PCRE_CASELESS;
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p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
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NULL);
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if (!p->pcre_regexp)
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compile_regexp_failed(p, error);
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p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
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if (!p->pcre_extra_info && error)
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die("%s", error);
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}
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static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
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regmatch_t *match, int eflags)
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{
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int ovector[30], ret, flags = 0;
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if (eflags & REG_NOTBOL)
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flags |= PCRE_NOTBOL;
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ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
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0, flags, ovector, ARRAY_SIZE(ovector));
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if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
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die("pcre_exec failed with error code %d", ret);
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if (ret > 0) {
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ret = 0;
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match->rm_so = ovector[0];
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match->rm_eo = ovector[1];
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}
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return ret;
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}
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static void free_pcre_regexp(struct grep_pat *p)
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{
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pcre_free(p->pcre_regexp);
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pcre_free(p->pcre_extra_info);
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}
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#else /* !USE_LIBPCRE */
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static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
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{
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die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
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}
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static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
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regmatch_t *match, int eflags)
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{
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return 1;
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}
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static void free_pcre_regexp(struct grep_pat *p)
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{
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}
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#endif /* !USE_LIBPCRE */
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static int is_fixed(const char *s, size_t len)
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{
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size_t i;
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/* regcomp cannot accept patterns with NULs so we
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* consider any pattern containing a NUL fixed.
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*/
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if (memchr(s, 0, len))
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return 1;
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for (i = 0; i < len; i++) {
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if (is_regex_special(s[i]))
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return 0;
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}
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return 1;
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}
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static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
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{
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int err;
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p->word_regexp = opt->word_regexp;
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p->ignore_case = opt->ignore_case;
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if (opt->fixed || is_fixed(p->pattern, p->patternlen))
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p->fixed = 1;
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else
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p->fixed = 0;
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if (p->fixed) {
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if (opt->regflags & REG_ICASE || p->ignore_case)
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p->kws = kwsalloc(tolower_trans_tbl);
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else
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p->kws = kwsalloc(NULL);
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kwsincr(p->kws, p->pattern, p->patternlen);
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kwsprep(p->kws);
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return;
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}
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if (opt->pcre) {
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compile_pcre_regexp(p, opt);
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return;
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}
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err = regcomp(&p->regexp, p->pattern, opt->regflags);
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if (err) {
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char errbuf[1024];
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regerror(err, &p->regexp, errbuf, 1024);
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regfree(&p->regexp);
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compile_regexp_failed(p, errbuf);
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}
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}
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static struct grep_expr *compile_pattern_or(struct grep_pat **);
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static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x;
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p = *list;
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if (!p)
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return NULL;
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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x = xcalloc(1, sizeof (struct grep_expr));
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x->node = GREP_NODE_ATOM;
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x->u.atom = p;
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*list = p->next;
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return x;
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case GREP_OPEN_PAREN:
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*list = p->next;
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x = compile_pattern_or(list);
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if (!*list || (*list)->token != GREP_CLOSE_PAREN)
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die("unmatched parenthesis");
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*list = (*list)->next;
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return x;
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default:
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return NULL;
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}
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}
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static struct grep_expr *compile_pattern_not(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x;
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p = *list;
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if (!p)
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return NULL;
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switch (p->token) {
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case GREP_NOT:
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if (!p->next)
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die("--not not followed by pattern expression");
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*list = p->next;
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x = xcalloc(1, sizeof (struct grep_expr));
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x->node = GREP_NODE_NOT;
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x->u.unary = compile_pattern_not(list);
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if (!x->u.unary)
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die("--not followed by non pattern expression");
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return x;
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default:
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return compile_pattern_atom(list);
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}
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}
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static struct grep_expr *compile_pattern_and(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x, *y, *z;
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x = compile_pattern_not(list);
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p = *list;
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if (p && p->token == GREP_AND) {
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if (!p->next)
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die("--and not followed by pattern expression");
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*list = p->next;
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y = compile_pattern_and(list);
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if (!y)
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die("--and not followed by pattern expression");
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z = xcalloc(1, sizeof (struct grep_expr));
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z->node = GREP_NODE_AND;
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z->u.binary.left = x;
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z->u.binary.right = y;
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return z;
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}
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return x;
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}
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static struct grep_expr *compile_pattern_or(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x, *y, *z;
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x = compile_pattern_and(list);
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p = *list;
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if (x && p && p->token != GREP_CLOSE_PAREN) {
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y = compile_pattern_or(list);
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if (!y)
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die("not a pattern expression %s", p->pattern);
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z = xcalloc(1, sizeof (struct grep_expr));
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z->node = GREP_NODE_OR;
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z->u.binary.left = x;
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z->u.binary.right = y;
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return z;
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}
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return x;
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}
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static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
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{
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return compile_pattern_or(list);
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}
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static struct grep_expr *grep_true_expr(void)
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{
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struct grep_expr *z = xcalloc(1, sizeof(*z));
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z->node = GREP_NODE_TRUE;
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return z;
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}
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static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
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{
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struct grep_expr *z = xcalloc(1, sizeof(*z));
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z->node = GREP_NODE_OR;
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z->u.binary.left = left;
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z->u.binary.right = right;
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return z;
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}
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static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p;
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struct grep_expr *header_expr;
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struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
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enum grep_header_field fld;
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if (!opt->header_list)
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return NULL;
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for (p = opt->header_list; p; p = p->next) {
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if (p->token != GREP_PATTERN_HEAD)
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die("bug: a non-header pattern in grep header list.");
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if (p->field < 0 || GREP_HEADER_FIELD_MAX <= p->field)
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die("bug: unknown header field %d", p->field);
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compile_regexp(p, opt);
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}
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for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
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header_group[fld] = NULL;
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for (p = opt->header_list; p; p = p->next) {
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struct grep_expr *h;
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struct grep_pat *pp = p;
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h = compile_pattern_atom(&pp);
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if (!h || pp != p->next)
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die("bug: malformed header expr");
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if (!header_group[p->field]) {
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header_group[p->field] = h;
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continue;
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}
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header_group[p->field] = grep_or_expr(h, header_group[p->field]);
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}
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header_expr = NULL;
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for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
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if (!header_group[fld])
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continue;
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if (!header_expr)
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header_expr = grep_true_expr();
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header_expr = grep_or_expr(header_group[fld], header_expr);
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}
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return header_expr;
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}
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void compile_grep_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p;
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struct grep_expr *header_expr = prep_header_patterns(opt);
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for (p = opt->pattern_list; p; p = p->next) {
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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compile_regexp(p, opt);
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break;
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default:
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opt->extended = 1;
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break;
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}
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}
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if (opt->all_match || header_expr)
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opt->extended = 1;
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else if (!opt->extended)
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return;
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p = opt->pattern_list;
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if (p)
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opt->pattern_expression = compile_pattern_expr(&p);
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if (p)
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die("incomplete pattern expression: %s", p->pattern);
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if (!header_expr)
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return;
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if (!opt->pattern_expression)
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opt->pattern_expression = header_expr;
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else
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opt->pattern_expression = grep_or_expr(opt->pattern_expression,
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header_expr);
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opt->all_match = 1;
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}
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static void free_pattern_expr(struct grep_expr *x)
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{
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switch (x->node) {
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case GREP_NODE_TRUE:
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case GREP_NODE_ATOM:
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break;
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case GREP_NODE_NOT:
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free_pattern_expr(x->u.unary);
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break;
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case GREP_NODE_AND:
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case GREP_NODE_OR:
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free_pattern_expr(x->u.binary.left);
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free_pattern_expr(x->u.binary.right);
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break;
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}
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free(x);
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}
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void free_grep_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p, *n;
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for (p = opt->pattern_list; p; p = n) {
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n = p->next;
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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case GREP_PATTERN_HEAD:
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case GREP_PATTERN_BODY:
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if (p->kws)
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kwsfree(p->kws);
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else if (p->pcre_regexp)
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free_pcre_regexp(p);
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else
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regfree(&p->regexp);
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free(p->pattern);
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break;
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default:
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break;
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}
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free(p);
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}
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if (!opt->extended)
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return;
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free_pattern_expr(opt->pattern_expression);
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}
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static char *end_of_line(char *cp, unsigned long *left)
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{
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unsigned long l = *left;
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while (l && *cp != '\n') {
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l--;
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cp++;
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}
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*left = l;
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return cp;
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}
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static int word_char(char ch)
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{
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return isalnum(ch) || ch == '_';
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}
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static void output_color(struct grep_opt *opt, const void *data, size_t size,
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const char *color)
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{
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if (want_color(opt->color) && color && color[0]) {
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opt->output(opt, color, strlen(color));
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opt->output(opt, data, size);
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opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
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} else
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opt->output(opt, data, size);
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}
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static void output_sep(struct grep_opt *opt, char sign)
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{
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if (opt->null_following_name)
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opt->output(opt, "\0", 1);
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else
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output_color(opt, &sign, 1, opt->color_sep);
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}
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static void show_name(struct grep_opt *opt, const char *name)
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{
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output_color(opt, name, strlen(name), opt->color_filename);
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opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
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}
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static int fixmatch(struct grep_pat *p, char *line, char *eol,
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regmatch_t *match)
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{
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struct kwsmatch kwsm;
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size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
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if (offset == -1) {
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match->rm_so = match->rm_eo = -1;
|
|
return REG_NOMATCH;
|
|
} else {
|
|
match->rm_so = offset;
|
|
match->rm_eo = match->rm_so + kwsm.size[0];
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int regmatch(const regex_t *preg, char *line, char *eol,
|
|
regmatch_t *match, int eflags)
|
|
{
|
|
#ifdef REG_STARTEND
|
|
match->rm_so = 0;
|
|
match->rm_eo = eol - line;
|
|
eflags |= REG_STARTEND;
|
|
#endif
|
|
return regexec(preg, line, 1, match, eflags);
|
|
}
|
|
|
|
static int patmatch(struct grep_pat *p, char *line, char *eol,
|
|
regmatch_t *match, int eflags)
|
|
{
|
|
int hit;
|
|
|
|
if (p->fixed)
|
|
hit = !fixmatch(p, line, eol, match);
|
|
else if (p->pcre_regexp)
|
|
hit = !pcrematch(p, line, eol, match, eflags);
|
|
else
|
|
hit = !regmatch(&p->regexp, line, eol, match, eflags);
|
|
|
|
return hit;
|
|
}
|
|
|
|
static int strip_timestamp(char *bol, char **eol_p)
|
|
{
|
|
char *eol = *eol_p;
|
|
int ch;
|
|
|
|
while (bol < --eol) {
|
|
if (*eol != '>')
|
|
continue;
|
|
*eol_p = ++eol;
|
|
ch = *eol;
|
|
*eol = '\0';
|
|
return ch;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct {
|
|
const char *field;
|
|
size_t len;
|
|
} header_field[] = {
|
|
{ "author ", 7 },
|
|
{ "committer ", 10 },
|
|
};
|
|
|
|
static int match_one_pattern(struct grep_pat *p, char *bol, char *eol,
|
|
enum grep_context ctx,
|
|
regmatch_t *pmatch, int eflags)
|
|
{
|
|
int hit = 0;
|
|
int saved_ch = 0;
|
|
const char *start = bol;
|
|
|
|
if ((p->token != GREP_PATTERN) &&
|
|
((p->token == GREP_PATTERN_HEAD) != (ctx == GREP_CONTEXT_HEAD)))
|
|
return 0;
|
|
|
|
if (p->token == GREP_PATTERN_HEAD) {
|
|
const char *field;
|
|
size_t len;
|
|
assert(p->field < ARRAY_SIZE(header_field));
|
|
field = header_field[p->field].field;
|
|
len = header_field[p->field].len;
|
|
if (strncmp(bol, field, len))
|
|
return 0;
|
|
bol += len;
|
|
saved_ch = strip_timestamp(bol, &eol);
|
|
}
|
|
|
|
again:
|
|
hit = patmatch(p, bol, eol, pmatch, eflags);
|
|
|
|
if (hit && p->word_regexp) {
|
|
if ((pmatch[0].rm_so < 0) ||
|
|
(eol - bol) < pmatch[0].rm_so ||
|
|
(pmatch[0].rm_eo < 0) ||
|
|
(eol - bol) < pmatch[0].rm_eo)
|
|
die("regexp returned nonsense");
|
|
|
|
/* Match beginning must be either beginning of the
|
|
* line, or at word boundary (i.e. the last char must
|
|
* not be a word char). Similarly, match end must be
|
|
* either end of the line, or at word boundary
|
|
* (i.e. the next char must not be a word char).
|
|
*/
|
|
if ( ((pmatch[0].rm_so == 0) ||
|
|
!word_char(bol[pmatch[0].rm_so-1])) &&
|
|
((pmatch[0].rm_eo == (eol-bol)) ||
|
|
!word_char(bol[pmatch[0].rm_eo])) )
|
|
;
|
|
else
|
|
hit = 0;
|
|
|
|
/* Words consist of at least one character. */
|
|
if (pmatch->rm_so == pmatch->rm_eo)
|
|
hit = 0;
|
|
|
|
if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
|
|
/* There could be more than one match on the
|
|
* line, and the first match might not be
|
|
* strict word match. But later ones could be!
|
|
* Forward to the next possible start, i.e. the
|
|
* next position following a non-word char.
|
|
*/
|
|
bol = pmatch[0].rm_so + bol + 1;
|
|
while (word_char(bol[-1]) && bol < eol)
|
|
bol++;
|
|
eflags |= REG_NOTBOL;
|
|
if (bol < eol)
|
|
goto again;
|
|
}
|
|
}
|
|
if (p->token == GREP_PATTERN_HEAD && saved_ch)
|
|
*eol = saved_ch;
|
|
if (hit) {
|
|
pmatch[0].rm_so += bol - start;
|
|
pmatch[0].rm_eo += bol - start;
|
|
}
|
|
return hit;
|
|
}
|
|
|
|
static int match_expr_eval(struct grep_expr *x, char *bol, char *eol,
|
|
enum grep_context ctx, int collect_hits)
|
|
{
|
|
int h = 0;
|
|
regmatch_t match;
|
|
|
|
if (!x)
|
|
die("Not a valid grep expression");
|
|
switch (x->node) {
|
|
case GREP_NODE_TRUE:
|
|
h = 1;
|
|
break;
|
|
case GREP_NODE_ATOM:
|
|
h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0);
|
|
break;
|
|
case GREP_NODE_NOT:
|
|
h = !match_expr_eval(x->u.unary, bol, eol, ctx, 0);
|
|
break;
|
|
case GREP_NODE_AND:
|
|
if (!match_expr_eval(x->u.binary.left, bol, eol, ctx, 0))
|
|
return 0;
|
|
h = match_expr_eval(x->u.binary.right, bol, eol, ctx, 0);
|
|
break;
|
|
case GREP_NODE_OR:
|
|
if (!collect_hits)
|
|
return (match_expr_eval(x->u.binary.left,
|
|
bol, eol, ctx, 0) ||
|
|
match_expr_eval(x->u.binary.right,
|
|
bol, eol, ctx, 0));
|
|
h = match_expr_eval(x->u.binary.left, bol, eol, ctx, 0);
|
|
x->u.binary.left->hit |= h;
|
|
h |= match_expr_eval(x->u.binary.right, bol, eol, ctx, 1);
|
|
break;
|
|
default:
|
|
die("Unexpected node type (internal error) %d", x->node);
|
|
}
|
|
if (collect_hits)
|
|
x->hit |= h;
|
|
return h;
|
|
}
|
|
|
|
static int match_expr(struct grep_opt *opt, char *bol, char *eol,
|
|
enum grep_context ctx, int collect_hits)
|
|
{
|
|
struct grep_expr *x = opt->pattern_expression;
|
|
return match_expr_eval(x, bol, eol, ctx, collect_hits);
|
|
}
|
|
|
|
static int match_line(struct grep_opt *opt, char *bol, char *eol,
|
|
enum grep_context ctx, int collect_hits)
|
|
{
|
|
struct grep_pat *p;
|
|
regmatch_t match;
|
|
|
|
if (opt->extended)
|
|
return match_expr(opt, bol, eol, ctx, collect_hits);
|
|
|
|
/* we do not call with collect_hits without being extended */
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
if (match_one_pattern(p, bol, eol, ctx, &match, 0))
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int match_next_pattern(struct grep_pat *p, char *bol, char *eol,
|
|
enum grep_context ctx,
|
|
regmatch_t *pmatch, int eflags)
|
|
{
|
|
regmatch_t match;
|
|
|
|
if (!match_one_pattern(p, bol, eol, ctx, &match, eflags))
|
|
return 0;
|
|
if (match.rm_so < 0 || match.rm_eo < 0)
|
|
return 0;
|
|
if (pmatch->rm_so >= 0 && pmatch->rm_eo >= 0) {
|
|
if (match.rm_so > pmatch->rm_so)
|
|
return 1;
|
|
if (match.rm_so == pmatch->rm_so && match.rm_eo < pmatch->rm_eo)
|
|
return 1;
|
|
}
|
|
pmatch->rm_so = match.rm_so;
|
|
pmatch->rm_eo = match.rm_eo;
|
|
return 1;
|
|
}
|
|
|
|
static int next_match(struct grep_opt *opt, char *bol, char *eol,
|
|
enum grep_context ctx, regmatch_t *pmatch, int eflags)
|
|
{
|
|
struct grep_pat *p;
|
|
int hit = 0;
|
|
|
|
pmatch->rm_so = pmatch->rm_eo = -1;
|
|
if (bol < eol) {
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
switch (p->token) {
|
|
case GREP_PATTERN: /* atom */
|
|
case GREP_PATTERN_HEAD:
|
|
case GREP_PATTERN_BODY:
|
|
hit |= match_next_pattern(p, bol, eol, ctx,
|
|
pmatch, eflags);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return hit;
|
|
}
|
|
|
|
static void show_line(struct grep_opt *opt, char *bol, char *eol,
|
|
const char *name, unsigned lno, char sign)
|
|
{
|
|
int rest = eol - bol;
|
|
char *line_color = NULL;
|
|
|
|
if (opt->file_break && opt->last_shown == 0) {
|
|
if (opt->show_hunk_mark)
|
|
opt->output(opt, "\n", 1);
|
|
} else if (opt->pre_context || opt->post_context || opt->funcbody) {
|
|
if (opt->last_shown == 0) {
|
|
if (opt->show_hunk_mark) {
|
|
output_color(opt, "--", 2, opt->color_sep);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
} else if (lno > opt->last_shown + 1) {
|
|
output_color(opt, "--", 2, opt->color_sep);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
}
|
|
if (opt->heading && opt->last_shown == 0) {
|
|
output_color(opt, name, strlen(name), opt->color_filename);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
opt->last_shown = lno;
|
|
|
|
if (!opt->heading && opt->pathname) {
|
|
output_color(opt, name, strlen(name), opt->color_filename);
|
|
output_sep(opt, sign);
|
|
}
|
|
if (opt->linenum) {
|
|
char buf[32];
|
|
snprintf(buf, sizeof(buf), "%d", lno);
|
|
output_color(opt, buf, strlen(buf), opt->color_lineno);
|
|
output_sep(opt, sign);
|
|
}
|
|
if (opt->color) {
|
|
regmatch_t match;
|
|
enum grep_context ctx = GREP_CONTEXT_BODY;
|
|
int ch = *eol;
|
|
int eflags = 0;
|
|
|
|
if (sign == ':')
|
|
line_color = opt->color_selected;
|
|
else if (sign == '-')
|
|
line_color = opt->color_context;
|
|
else if (sign == '=')
|
|
line_color = opt->color_function;
|
|
*eol = '\0';
|
|
while (next_match(opt, bol, eol, ctx, &match, eflags)) {
|
|
if (match.rm_so == match.rm_eo)
|
|
break;
|
|
|
|
output_color(opt, bol, match.rm_so, line_color);
|
|
output_color(opt, bol + match.rm_so,
|
|
match.rm_eo - match.rm_so,
|
|
opt->color_match);
|
|
bol += match.rm_eo;
|
|
rest -= match.rm_eo;
|
|
eflags = REG_NOTBOL;
|
|
}
|
|
*eol = ch;
|
|
}
|
|
output_color(opt, bol, rest, line_color);
|
|
opt->output(opt, "\n", 1);
|
|
}
|
|
|
|
#ifndef NO_PTHREADS
|
|
int grep_use_locks;
|
|
|
|
/*
|
|
* This lock protects access to the gitattributes machinery, which is
|
|
* not thread-safe.
|
|
*/
|
|
pthread_mutex_t grep_attr_mutex;
|
|
|
|
static inline void grep_attr_lock(void)
|
|
{
|
|
if (grep_use_locks)
|
|
pthread_mutex_lock(&grep_attr_mutex);
|
|
}
|
|
|
|
static inline void grep_attr_unlock(void)
|
|
{
|
|
if (grep_use_locks)
|
|
pthread_mutex_unlock(&grep_attr_mutex);
|
|
}
|
|
|
|
/*
|
|
* Same as git_attr_mutex, but protecting the thread-unsafe object db access.
|
|
*/
|
|
pthread_mutex_t grep_read_mutex;
|
|
|
|
#else
|
|
#define grep_attr_lock()
|
|
#define grep_attr_unlock()
|
|
#endif
|
|
|
|
static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bol, char *eol)
|
|
{
|
|
xdemitconf_t *xecfg = opt->priv;
|
|
if (xecfg && !xecfg->find_func) {
|
|
grep_source_load_driver(gs);
|
|
if (gs->driver->funcname.pattern) {
|
|
const struct userdiff_funcname *pe = &gs->driver->funcname;
|
|
xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
|
|
} else {
|
|
xecfg = opt->priv = NULL;
|
|
}
|
|
}
|
|
|
|
if (xecfg) {
|
|
char buf[1];
|
|
return xecfg->find_func(bol, eol - bol, buf, 1,
|
|
xecfg->find_func_priv) >= 0;
|
|
}
|
|
|
|
if (bol == eol)
|
|
return 0;
|
|
if (isalpha(*bol) || *bol == '_' || *bol == '$')
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void show_funcname_line(struct grep_opt *opt, struct grep_source *gs,
|
|
char *bol, unsigned lno)
|
|
{
|
|
while (bol > gs->buf) {
|
|
char *eol = --bol;
|
|
|
|
while (bol > gs->buf && bol[-1] != '\n')
|
|
bol--;
|
|
lno--;
|
|
|
|
if (lno <= opt->last_shown)
|
|
break;
|
|
|
|
if (match_funcname(opt, gs, bol, eol)) {
|
|
show_line(opt, bol, eol, gs->name, lno, '=');
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void show_pre_context(struct grep_opt *opt, struct grep_source *gs,
|
|
char *bol, char *end, unsigned lno)
|
|
{
|
|
unsigned cur = lno, from = 1, funcname_lno = 0;
|
|
int funcname_needed = !!opt->funcname;
|
|
|
|
if (opt->funcbody && !match_funcname(opt, gs, bol, end))
|
|
funcname_needed = 2;
|
|
|
|
if (opt->pre_context < lno)
|
|
from = lno - opt->pre_context;
|
|
if (from <= opt->last_shown)
|
|
from = opt->last_shown + 1;
|
|
|
|
/* Rewind. */
|
|
while (bol > gs->buf &&
|
|
cur > (funcname_needed == 2 ? opt->last_shown + 1 : from)) {
|
|
char *eol = --bol;
|
|
|
|
while (bol > gs->buf && bol[-1] != '\n')
|
|
bol--;
|
|
cur--;
|
|
if (funcname_needed && match_funcname(opt, gs, bol, eol)) {
|
|
funcname_lno = cur;
|
|
funcname_needed = 0;
|
|
}
|
|
}
|
|
|
|
/* We need to look even further back to find a function signature. */
|
|
if (opt->funcname && funcname_needed)
|
|
show_funcname_line(opt, gs, bol, cur);
|
|
|
|
/* Back forward. */
|
|
while (cur < lno) {
|
|
char *eol = bol, sign = (cur == funcname_lno) ? '=' : '-';
|
|
|
|
while (*eol != '\n')
|
|
eol++;
|
|
show_line(opt, bol, eol, gs->name, cur, sign);
|
|
bol = eol + 1;
|
|
cur++;
|
|
}
|
|
}
|
|
|
|
static int should_lookahead(struct grep_opt *opt)
|
|
{
|
|
struct grep_pat *p;
|
|
|
|
if (opt->extended)
|
|
return 0; /* punt for too complex stuff */
|
|
if (opt->invert)
|
|
return 0;
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
if (p->token != GREP_PATTERN)
|
|
return 0; /* punt for "header only" and stuff */
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int look_ahead(struct grep_opt *opt,
|
|
unsigned long *left_p,
|
|
unsigned *lno_p,
|
|
char **bol_p)
|
|
{
|
|
unsigned lno = *lno_p;
|
|
char *bol = *bol_p;
|
|
struct grep_pat *p;
|
|
char *sp, *last_bol;
|
|
regoff_t earliest = -1;
|
|
|
|
for (p = opt->pattern_list; p; p = p->next) {
|
|
int hit;
|
|
regmatch_t m;
|
|
|
|
hit = patmatch(p, bol, bol + *left_p, &m, 0);
|
|
if (!hit || m.rm_so < 0 || m.rm_eo < 0)
|
|
continue;
|
|
if (earliest < 0 || m.rm_so < earliest)
|
|
earliest = m.rm_so;
|
|
}
|
|
|
|
if (earliest < 0) {
|
|
*bol_p = bol + *left_p;
|
|
*left_p = 0;
|
|
return 1;
|
|
}
|
|
for (sp = bol + earliest; bol < sp && sp[-1] != '\n'; sp--)
|
|
; /* find the beginning of the line */
|
|
last_bol = sp;
|
|
|
|
for (sp = bol; sp < last_bol; sp++) {
|
|
if (*sp == '\n')
|
|
lno++;
|
|
}
|
|
*left_p -= last_bol - bol;
|
|
*bol_p = last_bol;
|
|
*lno_p = lno;
|
|
return 0;
|
|
}
|
|
|
|
static void std_output(struct grep_opt *opt, const void *buf, size_t size)
|
|
{
|
|
fwrite(buf, size, 1, stdout);
|
|
}
|
|
|
|
static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
|
|
{
|
|
char *bol;
|
|
unsigned long left;
|
|
unsigned lno = 1;
|
|
unsigned last_hit = 0;
|
|
int binary_match_only = 0;
|
|
unsigned count = 0;
|
|
int try_lookahead = 0;
|
|
int show_function = 0;
|
|
enum grep_context ctx = GREP_CONTEXT_HEAD;
|
|
xdemitconf_t xecfg;
|
|
|
|
if (!opt->output)
|
|
opt->output = std_output;
|
|
|
|
if (opt->pre_context || opt->post_context || opt->file_break ||
|
|
opt->funcbody) {
|
|
/* Show hunk marks, except for the first file. */
|
|
if (opt->last_shown)
|
|
opt->show_hunk_mark = 1;
|
|
/*
|
|
* If we're using threads then we can't easily identify
|
|
* the first file. Always put hunk marks in that case
|
|
* and skip the very first one later in work_done().
|
|
*/
|
|
if (opt->output != std_output)
|
|
opt->show_hunk_mark = 1;
|
|
}
|
|
opt->last_shown = 0;
|
|
|
|
switch (opt->binary) {
|
|
case GREP_BINARY_DEFAULT:
|
|
if (grep_source_is_binary(gs))
|
|
binary_match_only = 1;
|
|
break;
|
|
case GREP_BINARY_NOMATCH:
|
|
if (grep_source_is_binary(gs))
|
|
return 0; /* Assume unmatch */
|
|
break;
|
|
case GREP_BINARY_TEXT:
|
|
break;
|
|
default:
|
|
die("bug: unknown binary handling mode");
|
|
}
|
|
|
|
memset(&xecfg, 0, sizeof(xecfg));
|
|
opt->priv = &xecfg;
|
|
|
|
try_lookahead = should_lookahead(opt);
|
|
|
|
if (grep_source_load(gs) < 0)
|
|
return 0;
|
|
|
|
bol = gs->buf;
|
|
left = gs->size;
|
|
while (left) {
|
|
char *eol, ch;
|
|
int hit;
|
|
|
|
/*
|
|
* look_ahead() skips quickly to the line that possibly
|
|
* has the next hit; don't call it if we need to do
|
|
* something more than just skipping the current line
|
|
* in response to an unmatch for the current line. E.g.
|
|
* inside a post-context window, we will show the current
|
|
* line as a context around the previous hit when it
|
|
* doesn't hit.
|
|
*/
|
|
if (try_lookahead
|
|
&& !(last_hit
|
|
&& (show_function ||
|
|
lno <= last_hit + opt->post_context))
|
|
&& look_ahead(opt, &left, &lno, &bol))
|
|
break;
|
|
eol = end_of_line(bol, &left);
|
|
ch = *eol;
|
|
*eol = 0;
|
|
|
|
if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
|
|
ctx = GREP_CONTEXT_BODY;
|
|
|
|
hit = match_line(opt, bol, eol, ctx, collect_hits);
|
|
*eol = ch;
|
|
|
|
if (collect_hits)
|
|
goto next_line;
|
|
|
|
/* "grep -v -e foo -e bla" should list lines
|
|
* that do not have either, so inversion should
|
|
* be done outside.
|
|
*/
|
|
if (opt->invert)
|
|
hit = !hit;
|
|
if (opt->unmatch_name_only) {
|
|
if (hit)
|
|
return 0;
|
|
goto next_line;
|
|
}
|
|
if (hit) {
|
|
count++;
|
|
if (opt->status_only)
|
|
return 1;
|
|
if (opt->name_only) {
|
|
show_name(opt, gs->name);
|
|
return 1;
|
|
}
|
|
if (opt->count)
|
|
goto next_line;
|
|
if (binary_match_only) {
|
|
opt->output(opt, "Binary file ", 12);
|
|
output_color(opt, gs->name, strlen(gs->name),
|
|
opt->color_filename);
|
|
opt->output(opt, " matches\n", 9);
|
|
return 1;
|
|
}
|
|
/* Hit at this line. If we haven't shown the
|
|
* pre-context lines, we would need to show them.
|
|
*/
|
|
if (opt->pre_context || opt->funcbody)
|
|
show_pre_context(opt, gs, bol, eol, lno);
|
|
else if (opt->funcname)
|
|
show_funcname_line(opt, gs, bol, lno);
|
|
show_line(opt, bol, eol, gs->name, lno, ':');
|
|
last_hit = lno;
|
|
if (opt->funcbody)
|
|
show_function = 1;
|
|
goto next_line;
|
|
}
|
|
if (show_function && match_funcname(opt, gs, bol, eol))
|
|
show_function = 0;
|
|
if (show_function ||
|
|
(last_hit && lno <= last_hit + opt->post_context)) {
|
|
/* If the last hit is within the post context,
|
|
* we need to show this line.
|
|
*/
|
|
show_line(opt, bol, eol, gs->name, lno, '-');
|
|
}
|
|
|
|
next_line:
|
|
bol = eol + 1;
|
|
if (!left)
|
|
break;
|
|
left--;
|
|
lno++;
|
|
}
|
|
|
|
if (collect_hits)
|
|
return 0;
|
|
|
|
if (opt->status_only)
|
|
return 0;
|
|
if (opt->unmatch_name_only) {
|
|
/* We did not see any hit, so we want to show this */
|
|
show_name(opt, gs->name);
|
|
return 1;
|
|
}
|
|
|
|
xdiff_clear_find_func(&xecfg);
|
|
opt->priv = NULL;
|
|
|
|
/* NEEDSWORK:
|
|
* The real "grep -c foo *.c" gives many "bar.c:0" lines,
|
|
* which feels mostly useless but sometimes useful. Maybe
|
|
* make it another option? For now suppress them.
|
|
*/
|
|
if (opt->count && count) {
|
|
char buf[32];
|
|
output_color(opt, gs->name, strlen(gs->name), opt->color_filename);
|
|
output_sep(opt, ':');
|
|
snprintf(buf, sizeof(buf), "%u\n", count);
|
|
opt->output(opt, buf, strlen(buf));
|
|
return 1;
|
|
}
|
|
return !!last_hit;
|
|
}
|
|
|
|
static void clr_hit_marker(struct grep_expr *x)
|
|
{
|
|
/* All-hit markers are meaningful only at the very top level
|
|
* OR node.
|
|
*/
|
|
while (1) {
|
|
x->hit = 0;
|
|
if (x->node != GREP_NODE_OR)
|
|
return;
|
|
x->u.binary.left->hit = 0;
|
|
x = x->u.binary.right;
|
|
}
|
|
}
|
|
|
|
static int chk_hit_marker(struct grep_expr *x)
|
|
{
|
|
/* Top level nodes have hit markers. See if they all are hits */
|
|
while (1) {
|
|
if (x->node != GREP_NODE_OR)
|
|
return x->hit;
|
|
if (!x->u.binary.left->hit)
|
|
return 0;
|
|
x = x->u.binary.right;
|
|
}
|
|
}
|
|
|
|
int grep_source(struct grep_opt *opt, struct grep_source *gs)
|
|
{
|
|
/*
|
|
* we do not have to do the two-pass grep when we do not check
|
|
* buffer-wide "all-match".
|
|
*/
|
|
if (!opt->all_match)
|
|
return grep_source_1(opt, gs, 0);
|
|
|
|
/* Otherwise the toplevel "or" terms hit a bit differently.
|
|
* We first clear hit markers from them.
|
|
*/
|
|
clr_hit_marker(opt->pattern_expression);
|
|
grep_source_1(opt, gs, 1);
|
|
|
|
if (!chk_hit_marker(opt->pattern_expression))
|
|
return 0;
|
|
|
|
return grep_source_1(opt, gs, 0);
|
|
}
|
|
|
|
int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size)
|
|
{
|
|
struct grep_source gs;
|
|
int r;
|
|
|
|
grep_source_init(&gs, GREP_SOURCE_BUF, NULL, NULL);
|
|
gs.buf = buf;
|
|
gs.size = size;
|
|
|
|
r = grep_source(opt, &gs);
|
|
|
|
grep_source_clear(&gs);
|
|
return r;
|
|
}
|
|
|
|
void grep_source_init(struct grep_source *gs, enum grep_source_type type,
|
|
const char *name, const void *identifier)
|
|
{
|
|
gs->type = type;
|
|
gs->name = name ? xstrdup(name) : NULL;
|
|
gs->buf = NULL;
|
|
gs->size = 0;
|
|
gs->driver = NULL;
|
|
|
|
switch (type) {
|
|
case GREP_SOURCE_FILE:
|
|
gs->identifier = xstrdup(identifier);
|
|
break;
|
|
case GREP_SOURCE_SHA1:
|
|
gs->identifier = xmalloc(20);
|
|
memcpy(gs->identifier, identifier, 20);
|
|
break;
|
|
case GREP_SOURCE_BUF:
|
|
gs->identifier = NULL;
|
|
}
|
|
}
|
|
|
|
void grep_source_clear(struct grep_source *gs)
|
|
{
|
|
free(gs->name);
|
|
gs->name = NULL;
|
|
free(gs->identifier);
|
|
gs->identifier = NULL;
|
|
grep_source_clear_data(gs);
|
|
}
|
|
|
|
void grep_source_clear_data(struct grep_source *gs)
|
|
{
|
|
switch (gs->type) {
|
|
case GREP_SOURCE_FILE:
|
|
case GREP_SOURCE_SHA1:
|
|
free(gs->buf);
|
|
gs->buf = NULL;
|
|
gs->size = 0;
|
|
break;
|
|
case GREP_SOURCE_BUF:
|
|
/* leave user-provided buf intact */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int grep_source_load_sha1(struct grep_source *gs)
|
|
{
|
|
enum object_type type;
|
|
|
|
grep_read_lock();
|
|
gs->buf = read_sha1_file(gs->identifier, &type, &gs->size);
|
|
grep_read_unlock();
|
|
|
|
if (!gs->buf)
|
|
return error(_("'%s': unable to read %s"),
|
|
gs->name,
|
|
sha1_to_hex(gs->identifier));
|
|
return 0;
|
|
}
|
|
|
|
static int grep_source_load_file(struct grep_source *gs)
|
|
{
|
|
const char *filename = gs->identifier;
|
|
struct stat st;
|
|
char *data;
|
|
size_t size;
|
|
int i;
|
|
|
|
if (lstat(filename, &st) < 0) {
|
|
err_ret:
|
|
if (errno != ENOENT)
|
|
error(_("'%s': %s"), filename, strerror(errno));
|
|
return -1;
|
|
}
|
|
if (!S_ISREG(st.st_mode))
|
|
return -1;
|
|
size = xsize_t(st.st_size);
|
|
i = open(filename, O_RDONLY);
|
|
if (i < 0)
|
|
goto err_ret;
|
|
data = xmalloc(size + 1);
|
|
if (st.st_size != read_in_full(i, data, size)) {
|
|
error(_("'%s': short read %s"), filename, strerror(errno));
|
|
close(i);
|
|
free(data);
|
|
return -1;
|
|
}
|
|
close(i);
|
|
data[size] = 0;
|
|
|
|
gs->buf = data;
|
|
gs->size = size;
|
|
return 0;
|
|
}
|
|
|
|
int grep_source_load(struct grep_source *gs)
|
|
{
|
|
if (gs->buf)
|
|
return 0;
|
|
|
|
switch (gs->type) {
|
|
case GREP_SOURCE_FILE:
|
|
return grep_source_load_file(gs);
|
|
case GREP_SOURCE_SHA1:
|
|
return grep_source_load_sha1(gs);
|
|
case GREP_SOURCE_BUF:
|
|
return gs->buf ? 0 : -1;
|
|
}
|
|
die("BUG: invalid grep_source type");
|
|
}
|
|
|
|
void grep_source_load_driver(struct grep_source *gs)
|
|
{
|
|
if (gs->driver)
|
|
return;
|
|
|
|
grep_attr_lock();
|
|
gs->driver = userdiff_find_by_path(gs->name);
|
|
if (!gs->driver)
|
|
gs->driver = userdiff_find_by_name("default");
|
|
grep_attr_unlock();
|
|
}
|
|
|
|
int grep_source_is_binary(struct grep_source *gs)
|
|
{
|
|
grep_source_load_driver(gs);
|
|
if (gs->driver->binary != -1)
|
|
return gs->driver->binary;
|
|
|
|
if (!grep_source_load(gs))
|
|
return buffer_is_binary(gs->buf, gs->size);
|
|
|
|
return 0;
|
|
}
|