diff options
Diffstat (limited to 'posix/regexec.c')
| -rw-r--r-- | posix/regexec.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/posix/regexec.c b/posix/regexec.c index fa4f218df3..32ba80a155 100644 --- a/posix/regexec.c +++ b/posix/regexec.c @@ -60,7 +60,8 @@ static inline re_dfastate_t *acquire_init_state_context __attribute ((always_inline)) internal_function; static reg_errcode_t prune_impossible_nodes (re_match_context_t *mctx) internal_function; -static int check_matching (re_match_context_t *mctx, int fl_longest_match) +static int check_matching (re_match_context_t *mctx, int fl_longest_match, + int *p_match_first) internal_function; static int check_halt_node_context (const re_dfa_t *dfa, int node, unsigned int context) internal_function; @@ -745,7 +746,8 @@ re_search_internal (preg, string, length, start, range, stop, nmatch, pmatch, /* It seems to be appropriate one, then use the matcher. */ /* We assume that the matching starts from 0. */ mctx.state_log_top = mctx.nbkref_ents = mctx.max_mb_elem_len = 0; - match_last = check_matching (&mctx, fl_longest_match); + match_last = check_matching (&mctx, fl_longest_match, + range >= 0 ? &match_first : NULL); if (match_last != -1) { if (BE (match_last == -2, 0)) @@ -966,13 +968,16 @@ acquire_init_state_context (err, mctx, idx) and return the index where the matching end, return -1 if not match, or return -2 in case of an error. FL_LONGEST_MATCH means we want the POSIX longest matching. + If P_MATCH_FIRST is not NULL, and the match fails, it is set to the + next place where we may want to try matching. Note that the matcher assume that the maching starts from the current index of the buffer. */ static int -check_matching (mctx, fl_longest_match) +check_matching (mctx, fl_longest_match, p_match_first) re_match_context_t *mctx; int fl_longest_match; + int *p_match_first; { re_dfa_t *const dfa = mctx->dfa; reg_errcode_t err; @@ -980,6 +985,7 @@ check_matching (mctx, fl_longest_match) int match_last = -1; int cur_str_idx = re_string_cur_idx (&mctx->input); re_dfastate_t *cur_state; + int at_init_state = p_match_first != NULL, skipped = 0; cur_state = acquire_init_state_context (&err, mctx, cur_str_idx); /* An initial state must not be NULL(invalid state). */ @@ -992,6 +998,7 @@ check_matching (mctx, fl_longest_match) later. E.g. Processing back references. */ if (BE (dfa->nbackref, 0)) { + at_init_state = 0; err = check_subexp_matching_top (mctx, &cur_state->nodes, 0); if (BE (err != REG_NOERROR, 0)) return err; @@ -1022,7 +1029,16 @@ check_matching (mctx, fl_longest_match) while (!re_string_eoi (&mctx->input)) { + re_dfastate_t *old_state = cur_state; cur_state = transit_state (&err, mctx, cur_state); + if (at_init_state) + { + if (old_state == cur_state) + skipped++; + else + at_init_state = 0; + } + if (cur_state == NULL) /* Reached at the invalid state or an error. */ { cur_str_idx = re_string_cur_idx (&mctx->input); @@ -1062,6 +1078,10 @@ check_matching (mctx, fl_longest_match) } } } + + if (match_last == -1 && skipped) + *p_match_first += skipped; + return match_last; } |