diff options
Diffstat (limited to 're.c')
| -rw-r--r-- | re.c | 52 |
1 files changed, 25 insertions, 27 deletions
@@ -33,6 +33,7 @@ static void check_bracket_exp(char *s, size_t len); Regexp * make_regexp(const char *s, size_t len, int ignorecase, int dfa, int canfatal) { + static char metas[] = ".*+(){}[]|?^$\\"; Regexp *rp; const char *rerr; const char *src = s; @@ -46,6 +47,7 @@ make_regexp(const char *s, size_t len, int ignorecase, int dfa, int canfatal) int has_anchor = FALSE; int may_have_range = 0; reg_syntax_t dfa_syn; + int i; /* * The number of bytes in the current multibyte character. @@ -90,11 +92,11 @@ make_regexp(const char *s, size_t len, int ignorecase, int dfa, int canfatal) /* The previous byte is a singlebyte character, or last byte of a multibyte character. We check the next character. */ is_multibyte = mbrlen(src, end - src, &mbs); - if ( (is_multibyte == 1) - || (is_multibyte == (size_t) -1) - || (is_multibyte == (size_t) -2 - || (is_multibyte == 0))) { - /* We treat it as a singlebyte character. */ + if ( is_multibyte == 1 + || is_multibyte == (size_t) -1 + || is_multibyte == (size_t) -2 + || is_multibyte == 0) { + /* We treat it as a single-byte character. */ is_multibyte = 0; } } @@ -233,6 +235,21 @@ make_regexp(const char *s, size_t len, int ignorecase, int dfa, int canfatal) } else rp->dfa = FALSE; rp->has_anchor = has_anchor; + + /* Additional flags that help with RS as regexp. */ + for (i = 0; i < len; i++) { + if (strchr(metas, buf[i]) != NULL) { + rp->has_meta = TRUE; + break; + } + } + + for (i = len - 1; i >= 0; i--) { + if (strchr("*+|?", buf[i]) != NULL) { + rp->maybe_long = TRUE; + break; + } + } return rp; } @@ -422,17 +439,12 @@ avoid_dfa(NODE *re, char *str, size_t len) int reisstring(const char *text, size_t len, Regexp *re, const char *buf) { - static char metas[] = ".*+(){}[]|?^$\\"; - int i; int res; const char *matched; - /* simple checking for has meta characters in re */ - for (i = 0; i < len; i++) { - if (strchr(metas, text[i]) != NULL) { - return FALSE; /* give up early, can't be string match */ - } - } + /* simple checking for meta characters in re */ + if (re->has_meta) + return FALSE; /* give up early, can't be string match */ /* make accessable to gdb */ matched = &buf[RESTART(re, buf)]; @@ -442,20 +454,6 @@ reisstring(const char *text, size_t len, Regexp *re, const char *buf) return res; } -/* remaybelong --- return TRUE if the RE contains * ? | + */ - -int -remaybelong(const char *text, size_t len) -{ - while (len--) { - if (strchr("*+|?", *text++) != NULL) { - return TRUE; - } - } - - return FALSE; -} - /* reflags2str --- make a regex flags value readable */ const char * |