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-rw-r--r--grep.c1861
1 files changed, 1861 insertions, 0 deletions
diff --git a/grep.c b/grep.c
new file mode 100644
index 0000000..1194d35
--- /dev/null
+++ b/grep.c
@@ -0,0 +1,1861 @@
+#include "cache.h"
+#include "grep.h"
+#include "userdiff.h"
+#include "xdiff-interface.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "commit.h"
+#include "quote.h"
+
+static int grep_source_load(struct grep_source *gs);
+static int grep_source_is_binary(struct grep_source *gs);
+
+static struct grep_opt grep_defaults;
+
+/*
+ * Initialize the grep_defaults template with hardcoded defaults.
+ * We could let the compiler do this, but without C99 initializers
+ * the code gets unwieldy and unreadable, so...
+ */
+void init_grep_defaults(void)
+{
+ struct grep_opt *opt = &grep_defaults;
+ static int run_once;
+
+ if (run_once)
+ return;
+ run_once++;
+
+ memset(opt, 0, sizeof(*opt));
+ opt->relative = 1;
+ opt->pathname = 1;
+ opt->regflags = REG_NEWLINE;
+ opt->max_depth = -1;
+ opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
+ opt->extended_regexp_option = 0;
+ color_set(opt->color_context, "");
+ color_set(opt->color_filename, "");
+ color_set(opt->color_function, "");
+ color_set(opt->color_lineno, "");
+ color_set(opt->color_match_context, GIT_COLOR_BOLD_RED);
+ color_set(opt->color_match_selected, GIT_COLOR_BOLD_RED);
+ color_set(opt->color_selected, "");
+ color_set(opt->color_sep, GIT_COLOR_CYAN);
+ opt->color = -1;
+}
+
+static int parse_pattern_type_arg(const char *opt, const char *arg)
+{
+ if (!strcmp(arg, "default"))
+ return GREP_PATTERN_TYPE_UNSPECIFIED;
+ else if (!strcmp(arg, "basic"))
+ return GREP_PATTERN_TYPE_BRE;
+ else if (!strcmp(arg, "extended"))
+ return GREP_PATTERN_TYPE_ERE;
+ else if (!strcmp(arg, "fixed"))
+ return GREP_PATTERN_TYPE_FIXED;
+ else if (!strcmp(arg, "perl"))
+ return GREP_PATTERN_TYPE_PCRE;
+ die("bad %s argument: %s", opt, arg);
+}
+
+/*
+ * Read the configuration file once and store it in
+ * the grep_defaults template.
+ */
+int grep_config(const char *var, const char *value, void *cb)
+{
+ struct grep_opt *opt = &grep_defaults;
+ char *color = NULL;
+
+ if (userdiff_config(var, value) < 0)
+ return -1;
+
+ if (!strcmp(var, "grep.extendedregexp")) {
+ if (git_config_bool(var, value))
+ opt->extended_regexp_option = 1;
+ else
+ opt->extended_regexp_option = 0;
+ return 0;
+ }
+
+ if (!strcmp(var, "grep.patterntype")) {
+ opt->pattern_type_option = parse_pattern_type_arg(var, value);
+ return 0;
+ }
+
+ if (!strcmp(var, "grep.linenumber")) {
+ opt->linenum = git_config_bool(var, value);
+ return 0;
+ }
+
+ if (!strcmp(var, "grep.fullname")) {
+ opt->relative = !git_config_bool(var, value);
+ return 0;
+ }
+
+ if (!strcmp(var, "color.grep"))
+ opt->color = git_config_colorbool(var, value);
+ else if (!strcmp(var, "color.grep.context"))
+ color = opt->color_context;
+ else if (!strcmp(var, "color.grep.filename"))
+ color = opt->color_filename;
+ else if (!strcmp(var, "color.grep.function"))
+ color = opt->color_function;
+ else if (!strcmp(var, "color.grep.linenumber"))
+ color = opt->color_lineno;
+ else if (!strcmp(var, "color.grep.matchcontext"))
+ color = opt->color_match_context;
+ else if (!strcmp(var, "color.grep.matchselected"))
+ color = opt->color_match_selected;
+ else if (!strcmp(var, "color.grep.selected"))
+ color = opt->color_selected;
+ else if (!strcmp(var, "color.grep.separator"))
+ color = opt->color_sep;
+ else if (!strcmp(var, "color.grep.match")) {
+ int rc = 0;
+ if (!value)
+ return config_error_nonbool(var);
+ rc |= color_parse(value, opt->color_match_context);
+ rc |= color_parse(value, opt->color_match_selected);
+ return rc;
+ }
+
+ if (color) {
+ if (!value)
+ return config_error_nonbool(var);
+ return color_parse(value, color);
+ }
+ return 0;
+}
+
+/*
+ * Initialize one instance of grep_opt and copy the
+ * default values from the template we read the configuration
+ * information in an earlier call to git_config(grep_config).
+ */
+void grep_init(struct grep_opt *opt, const char *prefix)
+{
+ struct grep_opt *def = &grep_defaults;
+
+ memset(opt, 0, sizeof(*opt));
+ opt->prefix = prefix;
+ opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
+ opt->pattern_tail = &opt->pattern_list;
+ opt->header_tail = &opt->header_list;
+
+ opt->color = def->color;
+ opt->extended_regexp_option = def->extended_regexp_option;
+ opt->pattern_type_option = def->pattern_type_option;
+ opt->linenum = def->linenum;
+ opt->max_depth = def->max_depth;
+ opt->pathname = def->pathname;
+ opt->regflags = def->regflags;
+ opt->relative = def->relative;
+
+ color_set(opt->color_context, def->color_context);
+ color_set(opt->color_filename, def->color_filename);
+ color_set(opt->color_function, def->color_function);
+ color_set(opt->color_lineno, def->color_lineno);
+ color_set(opt->color_match_context, def->color_match_context);
+ color_set(opt->color_match_selected, def->color_match_selected);
+ color_set(opt->color_selected, def->color_selected);
+ color_set(opt->color_sep, def->color_sep);
+}
+
+static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
+{
+ switch (pattern_type) {
+ case GREP_PATTERN_TYPE_UNSPECIFIED:
+ /* fall through */
+
+ case GREP_PATTERN_TYPE_BRE:
+ opt->fixed = 0;
+ opt->pcre = 0;
+ opt->regflags &= ~REG_EXTENDED;
+ break;
+
+ case GREP_PATTERN_TYPE_ERE:
+ opt->fixed = 0;
+ opt->pcre = 0;
+ opt->regflags |= REG_EXTENDED;
+ break;
+
+ case GREP_PATTERN_TYPE_FIXED:
+ opt->fixed = 1;
+ opt->pcre = 0;
+ opt->regflags &= ~REG_EXTENDED;
+ break;
+
+ case GREP_PATTERN_TYPE_PCRE:
+ opt->fixed = 0;
+ opt->pcre = 1;
+ opt->regflags &= ~REG_EXTENDED;
+ break;
+ }
+}
+
+void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
+{
+ if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
+ grep_set_pattern_type_option(pattern_type, opt);
+ else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
+ grep_set_pattern_type_option(opt->pattern_type_option, opt);
+ else if (opt->extended_regexp_option)
+ grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
+}
+
+static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
+ const char *origin, int no,
+ enum grep_pat_token t,
+ enum grep_header_field field)
+{
+ struct grep_pat *p = xcalloc(1, sizeof(*p));
+ p->pattern = xmemdupz(pat, patlen);
+ p->patternlen = patlen;
+ p->origin = origin;
+ p->no = no;
+ p->token = t;
+ p->field = field;
+ return p;
+}
+
+static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
+{
+ **tail = p;
+ *tail = &p->next;
+ p->next = NULL;
+
+ switch (p->token) {
+ case GREP_PATTERN: /* atom */
+ case GREP_PATTERN_HEAD:
+ case GREP_PATTERN_BODY:
+ for (;;) {
+ struct grep_pat *new_pat;
+ size_t len = 0;
+ char *cp = p->pattern + p->patternlen, *nl = NULL;
+ while (++len <= p->patternlen) {
+ if (*(--cp) == '\n') {
+ nl = cp;
+ break;
+ }
+ }
+ if (!nl)
+ break;
+ new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
+ p->no, p->token, p->field);
+ new_pat->next = p->next;
+ if (!p->next)
+ *tail = &new_pat->next;
+ p->next = new_pat;
+ *nl = '\0';
+ p->patternlen -= len;
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+void append_header_grep_pattern(struct grep_opt *opt,
+ enum grep_header_field field, const char *pat)
+{
+ struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
+ GREP_PATTERN_HEAD, field);
+ if (field == GREP_HEADER_REFLOG)
+ opt->use_reflog_filter = 1;
+ do_append_grep_pat(&opt->header_tail, p);
+}
+
+void append_grep_pattern(struct grep_opt *opt, const char *pat,
+ const char *origin, int no, enum grep_pat_token t)
+{
+ append_grep_pat(opt, pat, strlen(pat), origin, no, t);
+}
+
+void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
+ const char *origin, int no, enum grep_pat_token t)
+{
+ struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
+ do_append_grep_pat(&opt->pattern_tail, p);
+}
+
+struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
+{
+ struct grep_pat *pat;
+ struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
+ *ret = *opt;
+
+ ret->pattern_list = NULL;
+ ret->pattern_tail = &ret->pattern_list;
+
+ for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
+ {
+ if(pat->token == GREP_PATTERN_HEAD)
+ append_header_grep_pattern(ret, pat->field,
+ pat->pattern);
+ else
+ append_grep_pat(ret, pat->pattern, pat->patternlen,
+ pat->origin, pat->no, pat->token);
+ }
+
+ return ret;
+}
+
+static NORETURN void compile_regexp_failed(const struct grep_pat *p,
+ const char *error)
+{
+ char where[1024];
+
+ if (p->no)
+ xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
+ else if (p->origin)
+ xsnprintf(where, sizeof(where), "%s, ", p->origin);
+ else
+ where[0] = 0;
+
+ die("%s'%s': %s", where, p->pattern, error);
+}
+
+#ifdef USE_LIBPCRE
+static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
+{
+ const char *error;
+ int erroffset;
+ int options = PCRE_MULTILINE;
+
+ if (opt->ignore_case) {
+ if (has_non_ascii(p->pattern))
+ p->pcre_tables = pcre_maketables();
+ options |= PCRE_CASELESS;
+ }
+ if (is_utf8_locale() && has_non_ascii(p->pattern))
+ options |= PCRE_UTF8;
+
+ p->pcre_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
+ p->pcre_tables);
+ if (!p->pcre_regexp)
+ compile_regexp_failed(p, error);
+
+ p->pcre_extra_info = pcre_study(p->pcre_regexp, 0, &error);
+ if (!p->pcre_extra_info && error)
+ die("%s", error);
+}
+
+static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
+ regmatch_t *match, int eflags)
+{
+ int ovector[30], ret, flags = 0;
+
+ if (eflags & REG_NOTBOL)
+ flags |= PCRE_NOTBOL;
+
+ ret = pcre_exec(p->pcre_regexp, p->pcre_extra_info, line, eol - line,
+ 0, flags, ovector, ARRAY_SIZE(ovector));
+ if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
+ die("pcre_exec failed with error code %d", ret);
+ if (ret > 0) {
+ ret = 0;
+ match->rm_so = ovector[0];
+ match->rm_eo = ovector[1];
+ }
+
+ return ret;
+}
+
+static void free_pcre_regexp(struct grep_pat *p)
+{
+ pcre_free(p->pcre_regexp);
+ pcre_free(p->pcre_extra_info);
+ pcre_free((void *)p->pcre_tables);
+}
+#else /* !USE_LIBPCRE */
+static void compile_pcre_regexp(struct grep_pat *p, const struct grep_opt *opt)
+{
+ die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
+}
+
+static int pcrematch(struct grep_pat *p, const char *line, const char *eol,
+ regmatch_t *match, int eflags)
+{
+ return 1;
+}
+
+static void free_pcre_regexp(struct grep_pat *p)
+{
+}
+#endif /* !USE_LIBPCRE */
+
+static int is_fixed(const char *s, size_t len)
+{
+ size_t i;
+
+ /* regcomp cannot accept patterns with NULs so we
+ * consider any pattern containing a NUL fixed.
+ */
+ if (memchr(s, 0, len))
+ return 1;
+
+ for (i = 0; i < len; i++) {
+ if (is_regex_special(s[i]))
+ return 0;
+ }
+
+ return 1;
+}
+
+static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
+{
+ struct strbuf sb = STRBUF_INIT;
+ int err;
+ int regflags;
+
+ basic_regex_quote_buf(&sb, p->pattern);
+ regflags = opt->regflags & ~REG_EXTENDED;
+ if (opt->ignore_case)
+ regflags |= REG_ICASE;
+ err = regcomp(&p->regexp, sb.buf, regflags);
+ if (opt->debug)
+ fprintf(stderr, "fixed %s\n", sb.buf);
+ strbuf_release(&sb);
+ if (err) {
+ char errbuf[1024];
+ regerror(err, &p->regexp, errbuf, sizeof(errbuf));
+ regfree(&p->regexp);
+ compile_regexp_failed(p, errbuf);
+ }
+}
+
+static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
+{
+ int icase, ascii_only;
+ int err;
+
+ p->word_regexp = opt->word_regexp;
+ p->ignore_case = opt->ignore_case;
+ icase = opt->regflags & REG_ICASE || p->ignore_case;
+ ascii_only = !has_non_ascii(p->pattern);
+
+ /*
+ * Even when -F (fixed) asks us to do a non-regexp search, we
+ * may not be able to correctly case-fold when -i
+ * (ignore-case) is asked (in which case, we'll synthesize a
+ * regexp to match the pattern that matches regexp special
+ * characters literally, while ignoring case differences). On
+ * the other hand, even without -F, if the pattern does not
+ * have any regexp special characters and there is no need for
+ * case-folding search, we can internally turn it into a
+ * simple string match using kws. p->fixed tells us if we
+ * want to use kws.
+ */
+ if (opt->fixed || is_fixed(p->pattern, p->patternlen))
+ p->fixed = !icase || ascii_only;
+ else
+ p->fixed = 0;
+
+ if (p->fixed) {
+ p->kws = kwsalloc(icase ? tolower_trans_tbl : NULL);
+ kwsincr(p->kws, p->pattern, p->patternlen);
+ kwsprep(p->kws);
+ return;
+ } else if (opt->fixed) {
+ /*
+ * We come here when the pattern has the non-ascii
+ * characters we cannot case-fold, and asked to
+ * ignore-case.
+ */
+ compile_fixed_regexp(p, opt);
+ return;
+ }
+
+ if (opt->pcre) {
+ compile_pcre_regexp(p, opt);
+ return;
+ }
+
+ err = regcomp(&p->regexp, p->pattern, opt->regflags);
+ if (err) {
+ char errbuf[1024];
+ regerror(err, &p->regexp, errbuf, 1024);
+ regfree(&p->regexp);
+ compile_regexp_failed(p, errbuf);
+ }
+}
+
+static struct grep_expr *compile_pattern_or(struct grep_pat **);
+static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x;
+
+ p = *list;
+ if (!p)
+ return NULL;
+ switch (p->token) {
+ case GREP_PATTERN: /* atom */
+ case GREP_PATTERN_HEAD:
+ case GREP_PATTERN_BODY:
+ x = xcalloc(1, sizeof (struct grep_expr));
+ x->node = GREP_NODE_ATOM;
+ x->u.atom = p;
+ *list = p->next;
+ return x;
+ case GREP_OPEN_PAREN:
+ *list = p->next;
+ x = compile_pattern_or(list);
+ if (!*list || (*list)->token != GREP_CLOSE_PAREN)
+ die("unmatched parenthesis");
+ *list = (*list)->next;
+ return x;
+ default:
+ return NULL;
+ }
+}
+
+static struct grep_expr *compile_pattern_not(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x;
+
+ p = *list;
+ if (!p)
+ return NULL;
+ switch (p->token) {
+ case GREP_NOT:
+ if (!p->next)
+ die("--not not followed by pattern expression");
+ *list = p->next;
+ x = xcalloc(1, sizeof (struct grep_expr));
+ x->node = GREP_NODE_NOT;
+ x->u.unary = compile_pattern_not(list);
+ if (!x->u.unary)
+ die("--not followed by non pattern expression");
+ return x;
+ default:
+ return compile_pattern_atom(list);
+ }
+}
+
+static struct grep_expr *compile_pattern_and(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x, *y, *z;
+
+ x = compile_pattern_not(list);
+ p = *list;
+ if (p && p->token == GREP_AND) {
+ if (!p->next)
+ die("--and not followed by pattern expression");
+ *list = p->next;
+ y = compile_pattern_and(list);
+ if (!y)
+ die("--and not followed by pattern expression");
+ z = xcalloc(1, sizeof (struct grep_expr));
+ z->node = GREP_NODE_AND;
+ z->u.binary.left = x;
+ z->u.binary.right = y;
+ return z;
+ }
+ return x;
+}
+
+static struct grep_expr *compile_pattern_or(struct grep_pat **list)
+{
+ struct grep_pat *p;
+ struct grep_expr *x, *y, *z;
+
+ x = compile_pattern_and(list);
+ p = *list;
+ if (x && p && p->token != GREP_CLOSE_PAREN) {
+ y = compile_pattern_or(list);
+ if (!y)
+ die("not a pattern expression %s", p->pattern);
+ z = xcalloc(1, sizeof (struct grep_expr));
+ z->node = GREP_NODE_OR;
+ z->u.binary.left = x;
+ z->u.binary.right = y;
+ return z;
+ }
+ return x;
+}
+
+static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
+{
+ return compile_pattern_or(list);
+}
+
+static void indent(int in)
+{
+ while (in-- > 0)
+ fputc(' ', stderr);
+}
+
+static void dump_grep_pat(struct grep_pat *p)
+{
+ switch (p->token) {
+ case GREP_AND: fprintf(stderr, "*and*"); break;
+ case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
+ case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
+ case GREP_NOT: fprintf(stderr, "*not*"); break;
+ case GREP_OR: fprintf(stderr, "*or*"); break;
+
+ case GREP_PATTERN: fprintf(stderr, "pattern"); break;
+ case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
+ case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
+ }
+
+ switch (p->token) {
+ default: break;
+ case GREP_PATTERN_HEAD:
+ fprintf(stderr, "<head %d>", p->field); break;
+ case GREP_PATTERN_BODY:
+ fprintf(stderr, "<body>"); break;
+ }
+ switch (p->token) {
+ default: break;
+ case GREP_PATTERN_HEAD:
+ case GREP_PATTERN_BODY:
+ case GREP_PATTERN:
+ fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
+ break;
+ }
+ fputc('\n', stderr);
+}
+
+static void dump_grep_expression_1(struct grep_expr *x, int in)
+{
+ indent(in);
+ switch (x->node) {
+ case GREP_NODE_TRUE:
+ fprintf(stderr, "true\n");
+ break;
+ case GREP_NODE_ATOM:
+ dump_grep_pat(x->u.atom);
+ break;
+ case GREP_NODE_NOT:
+ fprintf(stderr, "(not\n");
+ dump_grep_expression_1(x->u.unary, in+1);
+ indent(in);
+ fprintf(stderr, ")\n");
+ break;
+ case GREP_NODE_AND:
+ fprintf(stderr, "(and\n");
+ dump_grep_expression_1(x->u.binary.left, in+1);
+ dump_grep_expression_1(x->u.binary.right, in+1);
+ indent(in);
+ fprintf(stderr, ")\n");
+ break;
+ case GREP_NODE_OR:
+ fprintf(stderr, "(or\n");
+ dump_grep_expression_1(x->u.binary.left, in+1);
+ dump_grep_expression_1(x->u.binary.right, in+1);
+ indent(in);
+ fprintf(stderr, ")\n");
+ break;
+ }
+}
+
+static void dump_grep_expression(struct grep_opt *opt)
+{
+ struct grep_expr *x = opt->pattern_expression;
+
+ if (opt->all_match)
+ fprintf(stderr, "[all-match]\n");
+ dump_grep_expression_1(x, 0);
+ fflush(NULL);
+}
+
+static struct grep_expr *grep_true_expr(void)
+{
+ struct grep_expr *z = xcalloc(1, sizeof(*z));
+ z->node = GREP_NODE_TRUE;
+ return z;
+}
+
+static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
+{
+ struct grep_expr *z = xcalloc(1, sizeof(*z));
+ z->node = GREP_NODE_OR;
+ z->u.binary.left = left;
+ z->u.binary.right = right;
+ return z;
+}
+
+static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
+{
+ struct grep_pat *p;
+ struct grep_expr *header_expr;
+ struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
+ enum grep_header_field fld;
+
+ if (!opt->header_list)
+ return NULL;
+
+ for (p = opt->header_list; p; p = p->next) {
+ if (p->token != GREP_PATTERN_HEAD)
+ die("BUG: a non-header pattern in grep header list.");
+ if (p->field < GREP_HEADER_FIELD_MIN ||
+ GREP_HEADER_FIELD_MAX <= p->field)
+ die("BUG: unknown header field %d", p->field);
+ compile_regexp(p, opt);
+ }
+
+ for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
+ header_group[fld] = NULL;
+
+ for (p = opt->header_list; p; p = p->next) {
+ struct grep_expr *h;
+ struct grep_pat *pp = p;
+
+ h = compile_pattern_atom(&pp);
+ if (!h || pp != p->next)
+ die("BUG: malformed header expr");
+ if (!header_group[p->field]) {
+ header_group[p->field] = h;
+ continue;
+ }
+ header_group[p->field] = grep_or_expr(h, header_group[p->field]);
+ }
+
+ header_expr = NULL;
+
+ for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
+ if (!header_group[fld])
+ continue;
+ if (!header_expr)
+ header_expr = grep_true_expr();
+ header_expr = grep_or_expr(header_group[fld], header_expr);
+ }
+ return header_expr;
+}
+
+static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
+{
+ struct grep_expr *z = x;
+
+ while (x) {
+ assert(x->node == GREP_NODE_OR);
+ if (x->u.binary.right &&
+ x->u.binary.right->node == GREP_NODE_TRUE) {
+ x->u.binary.right = y;
+ break;
+ }
+ x = x->u.binary.right;
+ }
+ return z;
+}
+
+static void compile_grep_patterns_real(struct grep_opt *opt)
+{
+ struct grep_pat *p;
+ struct grep_expr *header_expr = prep_header_patterns(opt);
+
+ for (p = opt->pattern_list; p; p = p->next) {
+ switch (p->token) {
+ case GREP_PATTERN: /* atom */
+ case GREP_PATTERN_HEAD:
+ case GREP_PATTERN_BODY:
+ compile_regexp(p, opt);
+ break;
+ default:
+ opt->extended = 1;
+ break;
+ }
+ }
+
+ if (opt->all_match || header_expr)
+ opt->extended = 1;
+ else if (!opt->extended && !opt->debug)
+ return;
+
+ p = opt->pattern_list;
+ if (p)
+ opt->pattern_expression = compile_pattern_expr(&p);
+ if (p)
+ die("incomplete pattern expression: %s", p->pattern);
+
+ if (!header_expr)
+ return;
+
+ if (!opt->pattern_expression)
+ opt->pattern_expression = header_expr;
+ else if (opt->all_match)
+ opt->pattern_expression = grep_splice_or(header_expr,
+ opt->pattern_expression);
+ else
+ opt->pattern_expression = grep_or_expr(opt->pattern_expression,
+ header_expr);
+ opt->all_match = 1;
+}
+
+void compile_grep_patterns(struct grep_opt *opt)
+{
+ compile_grep_patterns_real(opt);
+ if (opt->debug)
+ dump_grep_expression(opt);
+}
+
+static void free_pattern_expr(struct grep_expr *x)
+{
+ switch (x->node) {
+ case GREP_NODE_TRUE:
+ case GREP_NODE_ATOM:
+ break;
+ case GREP_NODE_NOT:
+ free_pattern_expr(x->u.unary);
+ break;
+ case GREP_NODE_AND:
+ case GREP_NODE_OR:
+ free_pattern_expr(x->u.binary.left);
+ free_pattern_expr(x->u.binary.right);
+ break;
+ }
+ free(x);
+}
+
+void free_grep_patterns(struct grep_opt *opt)
+{
+ struct grep_pat *p, *n;
+
+ for (p = opt->pattern_list; p; p = n) {
+ n = p->next;
+ switch (p->token) {
+ case GREP_PATTERN: /* atom */
+ case GREP_PATTERN_HEAD:
+ case GREP_PATTERN_BODY:
+ if (p->kws)
+ kwsfree(p->kws);
+ else if (p->pcre_regexp)
+ free_pcre_regexp(p);
+ else
+ regfree(&p->regexp);
+ free(p->pattern);
+ break;
+ default:
+ break;
+ }
+ free(p);
+ }
+
+ if (!opt->extended)
+ return;
+ free_pattern_expr(opt->pattern_expression);
+}
+
+static char *end_of_line(char *cp, unsigned long *left)
+{
+ unsigned long l = *left;
+ while (l && *cp != '\n') {
+ l--;
+ cp++;
+ }
+ *left = l;
+ return cp;
+}
+
+static int word_char(char ch)
+{
+ return isalnum(ch) || ch == '_';
+}
+
+static void output_color(struct grep_opt *opt, const void *data, size_t size,
+ const char *color)
+{
+ if (want_color(opt->color) && color && color[0]) {
+ opt->output(opt, color, strlen(color));
+ opt->output(opt, data, size);
+ opt->output(opt, GIT_COLOR_RESET, strlen(GIT_COLOR_RESET));
+ } else
+ opt->output(opt, data, size);
+}
+
+static void output_sep(struct grep_opt *opt, char sign)
+{
+ if (opt->null_following_name)
+ opt->output(opt, "\0", 1);
+ else
+ output_color(opt, &sign, 1, opt->color_sep);
+}
+
+static void show_name(struct grep_opt *opt, const char *name)
+{
+ output_color(opt, name, strlen(name), opt->color_filename);
+ opt->output(opt, opt->null_following_name ? "\0" : "\n", 1);
+}
+
+static int fixmatch(struct grep_pat *p, char *line, char *eol,
+ regmatch_t *match)
+{
+ struct kwsmatch kwsm;
+ size_t offset = kwsexec(p->kws, line, eol - line, &kwsm);
+ if (offset == -1) {
+ 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 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 = !regexec_buf(&p->regexp, line, eol - line, 1, 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 },
+ { "reflog ", 7 },
+};
+
+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;
+ switch (p->field) {
+ case GREP_HEADER_AUTHOR:
+ case GREP_HEADER_COMMITTER:
+ saved_ch = strip_timestamp(bol, &eol);
+ break;
+ default:
+ break;
+ }
+ }
+
+ 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;
+ const char *match_color, *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 == ':')
+ match_color = opt->color_match_selected;
+ else
+ match_color = opt->color_match_context;
+ 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, match_color);
+ 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 fill_textconv_grep(struct userdiff_driver *driver,
+ struct grep_source *gs)
+{
+ struct diff_filespec *df;
+ char *buf;
+ size_t size;
+
+ if (!driver || !driver->textconv)
+ return grep_source_load(gs);
+
+ /*
+ * The textconv interface is intimately tied to diff_filespecs, so we
+ * have to pretend to be one. If we could unify the grep_source
+ * and diff_filespec structs, this mess could just go away.
+ */
+ df = alloc_filespec(gs->path);
+ switch (gs->type) {
+ case GREP_SOURCE_SHA1:
+ fill_filespec(df, gs->identifier, 1, 0100644);
+ break;
+ case GREP_SOURCE_FILE:
+ fill_filespec(df, null_sha1, 0, 0100644);
+ break;
+ default:
+ die("BUG: attempt to textconv something without a path?");
+ }
+
+ /*
+ * fill_textconv is not remotely thread-safe; it may load objects
+ * behind the scenes, and it modifies the global diff tempfile
+ * structure.
+ */
+ grep_read_lock();
+ size = fill_textconv(driver, df, &buf);
+ grep_read_unlock();
+ free_filespec(df);
+
+ /*
+ * The normal fill_textconv usage by the diff machinery would just keep
+ * the textconv'd buf separate from the diff_filespec. But much of the
+ * grep code passes around a grep_source and assumes that its "buf"
+ * pointer is the beginning of the thing we are searching. So let's
+ * install our textconv'd version into the grep_source, taking care not
+ * to leak any existing buffer.
+ */
+ grep_source_clear_data(gs);
+ gs->buf = buf;
+ gs->size = size;
+
+ return 0;
+}
+
+static int is_empty_line(const char *bol, const char *eol)
+{
+ while (bol < eol && isspace(*bol))
+ bol++;
+ return bol == eol;
+}
+
+static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int collect_hits)
+{
+ char *bol;
+ char *peek_bol = NULL;
+ 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;
+ struct userdiff_driver *textconv = NULL;
+ 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;
+
+ if (opt->allow_textconv) {
+ grep_source_load_driver(gs);
+ /*
+ * We might set up the shared textconv cache data here, which
+ * is not thread-safe.
+ */
+ grep_attr_lock();
+ textconv = userdiff_get_textconv(gs->driver);
+ grep_attr_unlock();
+ }
+
+ /*
+ * We know the result of a textconv is text, so we only have to care
+ * about binary handling if we are not using it.
+ */
+ if (!textconv) {
+ 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 (fill_textconv_grep(textconv, 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 && (!peek_bol || peek_bol < bol)) {
+ unsigned long peek_left = left;
+ char *peek_eol = eol;
+
+ /*
+ * Trailing empty lines are not interesting.
+ * Peek past them to see if they belong to the
+ * body of the current function.
+ */
+ peek_bol = bol;
+ while (is_empty_line(peek_bol, peek_eol)) {
+ peek_bol = peek_eol + 1;
+ peek_eol = end_of_line(peek_bol, &peek_left);
+ }
+
+ if (match_funcname(opt, gs, peek_bol, peek_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];
+ if (opt->pathname) {
+ 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, 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 char *path,
+ const void *identifier)
+{
+ gs->type = type;
+ gs->name = xstrdup_or_null(name);
+ gs->path = xstrdup_or_null(path);
+ 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);
+ hashcpy(gs->identifier, identifier);
+ break;
+ case GREP_SOURCE_BUF:
+ gs->identifier = NULL;
+ }
+}
+
+void grep_source_clear(struct grep_source *gs)
+{
+ free(gs->name);
+ gs->name = NULL;
+ free(gs->path);
+ gs->path = 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_errno(_("failed to stat '%s'"), filename);
+ 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 = xmallocz(size);
+ if (st.st_size != read_in_full(i, data, size)) {
+ error_errno(_("'%s': short read"), filename);
+ close(i);
+ free(data);
+ return -1;
+ }
+ close(i);
+
+ gs->buf = data;
+ gs->size = size;
+ return 0;
+}
+
+static 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();
+ if (gs->path)
+ gs->driver = userdiff_find_by_path(gs->path);
+ if (!gs->driver)
+ gs->driver = userdiff_find_by_name("default");
+ grep_attr_unlock();
+}
+
+static 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;
+}