diff options
Diffstat (limited to 'grep.c')
| -rw-r--r-- | grep.c | 22 |
1 files changed, 19 insertions, 3 deletions
@@ -72,6 +72,8 @@ static struct grep_expr *compile_pattern_atom(struct grep_pat **list) struct grep_expr *x; p = *list; + if (!p) + return NULL; switch (p->token) { case GREP_PATTERN: /* atom */ case GREP_PATTERN_HEAD: @@ -84,8 +86,6 @@ static struct grep_expr *compile_pattern_atom(struct grep_pat **list) case GREP_OPEN_PAREN: *list = p->next; x = compile_pattern_or(list); - if (!x) - return NULL; if (!*list || (*list)->token != GREP_CLOSE_PAREN) die("unmatched parenthesis"); *list = (*list)->next; @@ -101,6 +101,8 @@ static struct grep_expr *compile_pattern_not(struct grep_pat **list) struct grep_expr *x; p = *list; + if (!p) + return NULL; switch (p->token) { case GREP_NOT: if (!p->next) @@ -303,6 +305,7 @@ static int match_one_pattern(struct grep_pat *p, char *bol, char *eol, { 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))) @@ -328,7 +331,7 @@ static int match_one_pattern(struct grep_pat *p, char *bol, char *eol, if (hit && p->word_regexp) { if ((pmatch[0].rm_so < 0) || - (eol - bol) <= pmatch[0].rm_so || + (eol - bol) < pmatch[0].rm_so || (pmatch[0].rm_eo < 0) || (eol - bol) < pmatch[0].rm_eo) die("regexp returned nonsense"); @@ -347,6 +350,10 @@ static int match_one_pattern(struct grep_pat *p, char *bol, char *eol, 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 @@ -357,12 +364,17 @@ static int match_one_pattern(struct grep_pat *p, char *bol, char *eol, 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; } @@ -372,6 +384,8 @@ static int match_expr_eval(struct grep_expr *x, char *bol, char *eol, int h = 0; regmatch_t match; + if (!x) + die("Not a valid grep expression"); switch (x->node) { case GREP_NODE_ATOM: h = match_one_pattern(x->u.atom, bol, eol, ctx, &match, 0); @@ -490,6 +504,8 @@ static void show_line(struct grep_opt *opt, char *bol, char *eol, *eol = '\0'; while (next_match(opt, bol, eol, ctx, &match, eflags)) { + if (match.rm_so == match.rm_eo) + break; printf("%.*s%s%.*s%s", (int)match.rm_so, bol, opt->color_match, |