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upgrade to latest upstream TRE regex code (0.8.0)

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the main practical results of this change are
1. the regex code is no longer subject to LGPL; it's now 2-clause BSD
2. most (all?) popular nonstandard regex extensions are supported

I hesitate to call this a "sync" since both the old and new code are
heavily modified. in one sense, the old code was "more severely"
modified, in that it was actively hostile to non-strictly-conforming
expressions. on the other hand, the new code has eliminated the
useless translation of the entire regex string to wchar_t prior to
compiling, and now only converts multibyte character literals as
needed.

in the future i may use this modified TRE as a basis for writing the
long-planned new regex engine that will avoid multibyte-to-wide
character conversion entirely by compiling multibyte bracket
expressions specific to UTF-8.
This commit is contained in:
Rich Felker 2012-03-20 19:44:05 -04:00
parent baa43bca0a
commit ad47d45e9d
5 changed files with 1196 additions and 1327 deletions
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1933
src/regex/regcomp.c
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File diff suppressed because it is too large Load Diff

56
src/regex/regerror.c
View File

@ -1,26 +1,6 @@
/*
regerror.c - POSIX regerror() implementation for TRE.
Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include <regex.h>
#include <stdio.h>
/* Error message strings for error codes listed in `regex.h'. This list
needs to be in sync with the codes listed there, naturally. */
@ -28,7 +8,7 @@
/* Converted to single string by Rich Felker to remove the need for
* data relocations at runtime, 27 Feb 2006. */
static const char tre_error_messages[] = {
static const char messages[] = {
"No error\0"
"No match\0"
"Invalid regexp\0"
@ -43,33 +23,13 @@ static const char tre_error_messages[] = {
"Invalid character range\0"
"Out of memory\0"
"XXX\0"
"\0Unknown error"
};
size_t
regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size)
size_t regerror(int e, const regex_t *preg, char *buf, size_t size)
{
const char *err;
size_t err_len;
if (errcode >= 0 && errcode <= REG_BADRPT)
for (err=tre_error_messages; errcode; errcode--, err+=strlen(err)+1);
else
err = "Unknown error";
err_len = strlen(err) + 1;
if (errbuf_size > 0 && errbuf != NULL)
{
if (err_len > errbuf_size)
{
memcpy(errbuf, err, errbuf_size - 1);
errbuf[errbuf_size - 1] = '\0';
}
else
{
strcpy(errbuf, err);
}
}
return err_len;
const char *s;
for (s=messages; e && *s; e--, e+=strlen(s)+1);
if (!*s) s++;
return 1+snprintf(buf, size, "%s", s);
}
/* EOF */

380
src/regex/regexec.c
View File

@ -1,21 +1,31 @@
/*
regexec.c - TRE POSIX compatible matching functions (and more).
Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>.
Copyright (c) 2001-2009 Ville Laurikari <vl@iki.fi>
All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
@ -48,13 +58,40 @@ tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
str_byte += pos_add_next; \
} while (0)
#define IS_WORD_CHAR(c) ((c) == L'_' || tre_isalnum(c))
#define CHECK_ASSERTIONS(assertions) \
(((assertions & ASSERT_AT_BOL) \
&& (pos > 0 || reg_notbol) \
&& (prev_c != L'\n' || !reg_newline)) \
|| ((assertions & ASSERT_AT_EOL) \
&& (next_c != L'\0' || reg_noteol) \
&& (next_c != L'\n' || !reg_newline)))
&& (next_c != L'\n' || !reg_newline)) \
|| ((assertions & ASSERT_AT_BOW) \
&& (IS_WORD_CHAR(prev_c) || !IS_WORD_CHAR(next_c))) \
|| ((assertions & ASSERT_AT_EOW) \
&& (!IS_WORD_CHAR(prev_c) || IS_WORD_CHAR(next_c))) \
|| ((assertions & ASSERT_AT_WB) \
&& (pos != 0 && next_c != L'\0' \
&& IS_WORD_CHAR(prev_c) == IS_WORD_CHAR(next_c))) \
|| ((assertions & ASSERT_AT_WB_NEG) \
&& (pos == 0 || next_c == L'\0' \
|| IS_WORD_CHAR(prev_c) != IS_WORD_CHAR(next_c))))
#define CHECK_CHAR_CLASSES(trans_i, tnfa, eflags) \
(((trans_i->assertions & ASSERT_CHAR_CLASS) \
&& !(tnfa->cflags & REG_ICASE) \
&& !tre_isctype((tre_cint_t)prev_c, trans_i->u.class)) \
|| ((trans_i->assertions & ASSERT_CHAR_CLASS) \
&& (tnfa->cflags & REG_ICASE) \
&& !tre_isctype(tre_tolower((tre_cint_t)prev_c),trans_i->u.class) \
&& !tre_isctype(tre_toupper((tre_cint_t)prev_c),trans_i->u.class)) \
|| ((trans_i->assertions & ASSERT_CHAR_CLASS_NEG) \
&& tre_neg_char_classes_match(trans_i->neg_classes,(tre_cint_t)prev_c,\
tnfa->cflags & REG_ICASE)))
/* Returns 1 if `t1' wins `t2', 0 otherwise. */
static int
@ -86,7 +123,6 @@ tre_tag_order(int num_tags, tre_tag_direction_t *tag_directions,
static int
tre_neg_char_classes_match(tre_ctype_t *classes, tre_cint_t wc, int icase)
{
DPRINT(("neg_char_classes_test: %p, %d, %d\n", classes, wc, icase));
while (*classes != (tre_ctype_t)0)
if ((!icase && tre_isctype(wc, *classes))
|| (icase && (tre_isctype(tre_toupper(wc), *classes)
@ -118,7 +154,6 @@ tre_neg_char_classes_match(tre_ctype_t *classes, tre_cint_t wc, int icase)
See `tre-match-backtrack.c'.
*/
typedef struct {
tre_tnfa_transition_t *state;
int *tags;
@ -130,41 +165,16 @@ typedef struct {
} tre_reach_pos_t;
#ifdef TRE_DEBUG
static void
tre_print_reach(const tre_tnfa_t *tnfa, tre_tnfa_reach_t *reach, int num_tags)
{
int i;
while (reach->state != NULL)
{
DPRINT((" %p", (void *)reach->state));
if (num_tags > 0)
{
DPRINT(("/"));
for (i = 0; i < num_tags; i++)
{
DPRINT(("%d:%d", i, reach->tags[i]));
if (i < (num_tags-1))
DPRINT((","));
}
}
reach++;
}
DPRINT(("\n"));
}
#endif /* TRE_DEBUG */
static reg_errcode_t
tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
int *match_tags, int eflags, int *match_end_ofs)
tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string,
int *match_tags, int eflags,
int *match_end_ofs)
{
/* State variables required by GET_NEXT_WCHAR. */
tre_char_t prev_c = 0, next_c = 0;
const char *str_byte = string;
int pos = -1;
int pos_add_next = 1;
unsigned int pos_add_next = 1;
#ifdef TRE_MBSTATE
mbstate_t mbstate;
#endif /* TRE_MBSTATE */
@ -210,14 +220,10 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
+ (rbytes + xbytes * tnfa->num_states) * 2 + tbytes + pbytes;
/* Allocate the memory. */
#ifdef TRE_USE_ALLOCA
buf = alloca(total_bytes);
#else /* !TRE_USE_ALLOCA */
buf = xmalloc(total_bytes);
#endif /* !TRE_USE_ALLOCA */
buf = xmalloc((unsigned)total_bytes);
if (buf == NULL)
return REG_ESPACE;
memset(buf, 0, total_bytes);
memset(buf, 0, (size_t)total_bytes);
/* Get the various pointers within tmp_buf (properly aligned). */
tmp_tags = (void *)buf;
@ -247,17 +253,12 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
GET_NEXT_WCHAR();
pos = 0;
DPRINT(("length: %d\n", len));
DPRINT(("pos:chr/code | states and tags\n"));
DPRINT(("-------------+------------------------------------------------\n"));
reach_next_i = reach_next;
while (1)
{
/* If no match found yet, add the initial states to `reach_next'. */
if (match_eo < 0)
{
DPRINT((" init >"));
trans_i = tnfa->initial;
while (trans_i->state != NULL)
{
@ -266,12 +267,10 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
if (trans_i->assertions
&& CHECK_ASSERTIONS(trans_i->assertions))
{
DPRINT(("assertion failed\n"));
trans_i++;
continue;
}
DPRINT((" %p", (void *)trans_i->state));
reach_next_i->state = trans_i->state;
for (i = 0; i < num_tags; i++)
reach_next_i->tags[i] = -1;
@ -285,7 +284,6 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
}
if (reach_next_i->state == tnfa->final)
{
DPRINT((" found empty match\n"));
match_eo = pos;
new_match = 1;
for (i = 0; i < num_tags; i++)
@ -297,7 +295,6 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
}
trans_i++;
}
DPRINT(("\n"));
reach_next_i->state = NULL;
}
else
@ -312,18 +309,53 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
GET_NEXT_WCHAR();
#ifdef TRE_DEBUG
DPRINT(("%3d:%2lc/%05d |", pos - 1, (tre_cint_t)prev_c, (int)prev_c));
tre_print_reach(tnfa, reach_next, num_tags);
DPRINT(("%3d:%2lc/%05d |", pos, (tre_cint_t)next_c, (int)next_c));
tre_print_reach(tnfa, reach_next, num_tags);
#endif /* TRE_DEBUG */
/* Swap `reach' and `reach_next'. */
reach_i = reach;
reach = reach_next;
reach_next = reach_i;
/* For each state in `reach', weed out states that don't fulfill the
minimal matching conditions. */
if (tnfa->num_minimals && new_match)
{
new_match = 0;
reach_next_i = reach_next;
for (reach_i = reach; reach_i->state; reach_i++)
{
int skip = 0;
for (i = 0; tnfa->minimal_tags[i] >= 0; i += 2)
{
int end = tnfa->minimal_tags[i];
int start = tnfa->minimal_tags[i + 1];
if (end >= num_tags)
{
skip = 1;
break;
}
else if (reach_i->tags[start] == match_tags[start]
&& reach_i->tags[end] < match_tags[end])
{
skip = 1;
break;
}
}
if (!skip)
{
reach_next_i->state = reach_i->state;
tmp_iptr = reach_next_i->tags;
reach_next_i->tags = reach_i->tags;
reach_i->tags = tmp_iptr;
reach_next_i++;
}
}
reach_next_i->state = NULL;
/* Swap `reach' and `reach_next'. */
reach_i = reach;
reach = reach_next;
reach_next = reach_i;
}
/* For each state in `reach' see if there is a transition leaving with
the current input symbol to a state not yet in `reach_next', and
add the destination states to `reach_next'. */
@ -333,28 +365,13 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
for (trans_i = reach_i->state; trans_i->state; trans_i++)
{
/* Does this transition match the input symbol? */
if (trans_i->code_min <= prev_c &&
trans_i->code_max >= prev_c)
if (trans_i->code_min <= (tre_cint_t)prev_c &&
trans_i->code_max >= (tre_cint_t)prev_c)
{
if (trans_i->assertions
&& (CHECK_ASSERTIONS(trans_i->assertions)
/* Handle character class transitions. */
|| ((trans_i->assertions & ASSERT_CHAR_CLASS)
&& !(tnfa->cflags & REG_ICASE)
&& !tre_isctype((tre_cint_t)prev_c,
trans_i->u.class))
|| ((trans_i->assertions & ASSERT_CHAR_CLASS)
&& (tnfa->cflags & REG_ICASE)
&& (!tre_isctype(tre_tolower((tre_cint_t)prev_c),
trans_i->u.class)
&& !tre_isctype(tre_toupper((tre_cint_t)prev_c),
trans_i->u.class)))
|| ((trans_i->assertions & ASSERT_CHAR_CLASS_NEG)
&& tre_neg_char_classes_match(trans_i->neg_classes,
(tre_cint_t)prev_c,
tnfa->cflags & REG_ICASE))))
|| CHECK_CHAR_CLASSES(trans_i, tnfa, eflags)))
{
DPRINT(("assertion failed\n"));
continue;
}
@ -385,7 +402,6 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
|| (num_tags > 0
&& reach_next_i->tags[0] <= match_tags[0])))
{
DPRINT((" found match %p\n", trans_i->state));
match_eo = pos;
new_match = 1;
for (i = 0; i < num_tags; i++)
@ -409,7 +425,6 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
*reach_pos[trans_i->state_id].tags = tmp_tags;
if (trans_i->state == tnfa->final)
{
DPRINT((" found better match\n"));
match_eo = pos;
new_match = 1;
for (i = 0; i < num_tags; i++)
@ -424,18 +439,15 @@ tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
reach_next_i->state = NULL;
}
DPRINT(("match end offset = %d\n", match_eo));
#ifndef TRE_USE_ALLOCA
if (buf)
xfree(buf);
#endif /* !TRE_USE_ALLOCA */
*match_end_ofs = match_eo;
return match_eo >= 0 ? REG_OK : REG_NOMATCH;
}
/***********************************************************************
from tre-match-backtrack.c
***********************************************************************/
@ -489,16 +501,9 @@ typedef struct tre_backtrack_struct {
#define BT_STACK_MBSTATE_OUT
#endif /* !TRE_MBSTATE */
#ifdef TRE_USE_ALLOCA
#define tre_bt_mem_new tre_mem_newa
#define tre_bt_mem_alloc tre_mem_alloca
#define tre_bt_mem_destroy(obj) do { } while (0)
#else /* !TRE_USE_ALLOCA */
#define tre_bt_mem_new tre_mem_new
#define tre_bt_mem_alloc tre_mem_alloc
#define tre_bt_mem_destroy tre_mem_destroy
#endif /* !TRE_USE_ALLOCA */
#define BT_STACK_PUSH(_pos, _str_byte, _str_wide, _state, _state_id, _next_c, _tags, _mbstate) \
@ -572,14 +577,13 @@ typedef struct tre_backtrack_struct {
static reg_errcode_t
tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
int len, int *match_tags,
int eflags, int *match_end_ofs)
int *match_tags, int eflags, int *match_end_ofs)
{
/* State variables required by GET_NEXT_WCHAR. */
tre_char_t prev_c = 0, next_c = 0;
const char *str_byte = string;
int pos = 0;
int pos_add_next = 1;
unsigned int pos_add_next = 1;
#ifdef TRE_MBSTATE
mbstate_t mbstate;
#endif /* TRE_MBSTATE */
@ -597,9 +601,6 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
mbstate_t mbstate_start;
#endif /* TRE_MBSTATE */
/* Compilation flags for this regexp. */
int cflags = tnfa->cflags;
/* End offset of best match so far, or -1 if no match found yet. */
int match_eo = -1;
/* Tag arrays. */
@ -633,30 +634,33 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
stack->prev = NULL;
stack->next = NULL;
#ifdef TRE_USE_ALLOCA
tags = alloca(sizeof(*tags) * tnfa->num_tags);
pmatch = alloca(sizeof(*pmatch) * tnfa->num_submatches);
states_seen = alloca(sizeof(*states_seen) * tnfa->num_states);
#else /* !TRE_USE_ALLOCA */
tags = xmalloc(sizeof(*tags) * tnfa->num_tags);
if (!tags)
if (tnfa->num_tags)
{
ret = REG_ESPACE;
goto error_exit;
tags = xmalloc(sizeof(*tags) * tnfa->num_tags);
if (!tags)
{
ret = REG_ESPACE;
goto error_exit;
}
}
pmatch = xmalloc(sizeof(*pmatch) * tnfa->num_submatches);
if (!pmatch)
if (tnfa->num_submatches)
{
ret = REG_ESPACE;
goto error_exit;
pmatch = xmalloc(sizeof(*pmatch) * tnfa->num_submatches);
if (!pmatch)
{
ret = REG_ESPACE;
goto error_exit;
}
}
states_seen = xmalloc(sizeof(*states_seen) * tnfa->num_states);
if (!states_seen)
if (tnfa->num_states)
{
ret = REG_ESPACE;
goto error_exit;
states_seen = xmalloc(sizeof(*states_seen) * tnfa->num_states);
if (!states_seen)
{
ret = REG_ESPACE;
goto error_exit;
}
}
#endif /* !TRE_USE_ALLOCA */
retry:
{
@ -685,10 +689,8 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
next_tags = NULL;
for (trans_i = tnfa->initial; trans_i->state; trans_i++)
{
DPRINT(("> init %p, prev_c %lc\n", trans_i->state, (tre_cint_t)prev_c));
if (trans_i->assertions && CHECK_ASSERTIONS(trans_i->assertions))
{
DPRINT(("assert failed\n"));
continue;
}
if (state == NULL)
@ -700,8 +702,7 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
else
{
/* Backtrack to this state. */
DPRINT(("saving state %d for backtracking\n", trans_i->state_id));
BT_STACK_PUSH(pos, str_byte, str_wide, trans_i->state,
BT_STACK_PUSH(pos, str_byte, 0, trans_i->state,
trans_i->state_id, next_c, tags, mbstate);
{
int *tmp = trans_i->tags;
@ -717,22 +718,16 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
tags[*next_tags] = pos;
DPRINT(("entering match loop, pos %d, str_byte %p\n", pos, str_byte));
DPRINT(("pos:chr/code | state and tags\n"));
DPRINT(("-------------+------------------------------------------------\n"));
if (state == NULL)
goto backtrack;
while (1)
{
tre_tnfa_transition_t *trans_i, *next_state;
tre_tnfa_transition_t *next_state;
int empty_br_match;
DPRINT(("start loop\n"));
if (state == tnfa->final)
{
DPRINT((" match found, %d %d\n", match_eo, pos));
if (match_eo < pos
|| (match_eo == pos
&& match_tags
@ -741,7 +736,6 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
{
int i;
/* This match wins the previous match. */
DPRINT((" win previous\n"));
match_eo = pos;
if (match_tags)
for (i = 0; i < tnfa->num_tags; i++)
@ -752,17 +746,6 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
goto backtrack;
}
#ifdef TRE_DEBUG
DPRINT(("%3d:%2lc/%05d | %p ", pos, (tre_cint_t)next_c, (int)next_c,
state));
{
int i;
for (i = 0; i < tnfa->num_tags; i++)
DPRINT(("%d%s", tags[i], i < tnfa->num_tags - 1 ? ", " : ""));
DPRINT(("\n"));
}
#endif /* TRE_DEBUG */
/* Go to the next character in the input string. */
empty_br_match = 0;
trans_i = state;
@ -775,26 +758,17 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
int bt_len;
int result;
DPRINT((" should match back reference %d\n", bt));
/* Get the substring we need to match against. Remember to
turn off REG_NOSUB temporarily. */
tre_fill_pmatch(bt + 1, pmatch, tnfa->cflags & !REG_NOSUB,
tre_fill_pmatch(bt + 1, pmatch, tnfa->cflags & ~REG_NOSUB,
tnfa, tags, pos);
so = pmatch[bt].rm_so;
eo = pmatch[bt].rm_eo;
bt_len = eo - so;
if (len < 0)
{
result = strncmp((char*)string + so, str_byte - 1, bt_len);
}
else if (len - pos < bt_len)
result = 1;
else
result = memcmp((char*)string + so, str_byte - 1, bt_len);
result = strncmp((const char*)string + so, str_byte - 1,
(size_t)bt_len);
/* We can ignore multibyte characters here because the backref
string is already aligned at character boundaries. */
if (result == 0)
{
/* Back reference matched. Check for infinite loop. */
@ -802,7 +776,6 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
empty_br_match = 1;
if (empty_br_match && states_seen[trans_i->state_id])
{
DPRINT((" avoid loop\n"));
goto backtrack;
}
@ -810,31 +783,20 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
/* Advance in input string and resync `prev_c', `next_c'
and pos. */
DPRINT((" back reference matched\n"));
str_byte += bt_len - 1;
pos += bt_len - 1;
GET_NEXT_WCHAR();
DPRINT((" pos now %d\n", pos));
}
else
{
DPRINT((" back reference did not match\n"));
goto backtrack;
}
}
else
{
/* Check for end of string. */
if (len < 0)
{
if (next_c == L'\0')
if (next_c == L'\0')
goto backtrack;
}
else
{
if (pos >= len)
goto backtrack;
}
/* Read the next character. */
GET_NEXT_WCHAR();
@ -843,49 +805,29 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
next_state = NULL;
for (trans_i = state; trans_i->state; trans_i++)
{
DPRINT((" transition %d-%d (%c-%c) %d to %d\n",
trans_i->code_min, trans_i->code_max,
trans_i->code_min, trans_i->code_max,
trans_i->assertions, trans_i->state_id));
if (trans_i->code_min <= prev_c && trans_i->code_max >= prev_c)
if (trans_i->code_min <= (tre_cint_t)prev_c
&& trans_i->code_max >= (tre_cint_t)prev_c)
{
if (trans_i->assertions
&& (CHECK_ASSERTIONS(trans_i->assertions)
/* Handle character class transitions. */
|| ((trans_i->assertions & ASSERT_CHAR_CLASS)
&& !(cflags & REG_ICASE)
&& !tre_isctype((tre_cint_t)prev_c, trans_i->u.class))
|| ((trans_i->assertions & ASSERT_CHAR_CLASS)
&& (cflags & REG_ICASE)
&& (!tre_isctype(tre_tolower((tre_cint_t)prev_c),
trans_i->u.class)
&& !tre_isctype(tre_toupper((tre_cint_t)prev_c),
trans_i->u.class)))
|| ((trans_i->assertions & ASSERT_CHAR_CLASS_NEG)
&& tre_neg_char_classes_match(trans_i->neg_classes,
(tre_cint_t)prev_c,
cflags & REG_ICASE))))
|| CHECK_CHAR_CLASSES(trans_i, tnfa, eflags)))
{
DPRINT((" assertion failed\n"));
continue;
}
if (next_state == NULL)
{
/* First matching transition. */
DPRINT((" Next state is %d\n", trans_i->state_id));
next_state = trans_i->state;
next_tags = trans_i->tags;
}
else
{
/* Second mathing transition. We may need to backtrack here
/* Second matching transition. We may need to backtrack here
to take this transition instead of the first one, so we
push this transition in the backtracking stack so we can
jump back here if needed. */
DPRINT((" saving state %d for backtracking\n",
trans_i->state_id));
BT_STACK_PUSH(pos, str_byte, str_wide, trans_i->state,
BT_STACK_PUSH(pos, str_byte, 0, trans_i->state,
trans_i->state_id, next_c, tags, mbstate);
{
int *tmp;
@ -916,11 +858,8 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
/* A matching transition was not found. Try to backtrack. */
if (stack->prev)
{
DPRINT((" backtracking\n"));
if (stack->item.state->assertions & ASSERT_BACKREF)
{
DPRINT((" states_seen[%d] = 0\n",
stack->item.state_id));
states_seen[stack->item.state_id] = 0;
}
@ -930,23 +869,10 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
{
/* Try starting from a later position in the input string. */
/* Check for end of string. */
if (len < 0)
{
if (next_c == L'\0')
if (next_c == L'\0')
{
DPRINT(("end of string.\n"));
break;
}
}
else
{
if (pos >= len)
{
DPRINT(("end of string.\n"));
break;
}
}
DPRINT(("restarting from next start position\n"));
next_c = next_c_start;
#ifdef TRE_MBSTATE
mbstate = mbstate_start;
@ -956,7 +882,6 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
}
else
{
DPRINT(("finished\n"));
break;
}
}
@ -979,7 +904,6 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
return ret;
}
/***********************************************************************
from regexec.c
***********************************************************************/
@ -998,7 +922,6 @@ tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
if (match_eo >= 0 && !(cflags & REG_NOSUB))
{
/* Construct submatch offsets from the tags. */
DPRINT(("end tag = t%d = %d\n", tnfa->end_tag, match_eo));
submatch_data = tnfa->submatch_data;
while (i < tnfa->num_submatches && i < nmatch)
{
@ -1017,9 +940,6 @@ tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
if (pmatch[i].rm_so == -1 || pmatch[i].rm_eo == -1)
pmatch[i].rm_so = pmatch[i].rm_eo = -1;
DPRINT(("pmatch[%d] = {t%d = %d, t%d = %d}\n", i,
submatch_data[i].so_tag, pmatch[i].rm_so,
submatch_data[i].eo_tag, pmatch[i].rm_eo));
i++;
}
/* Reset all submatches that are not within all of their parent
@ -1035,7 +955,6 @@ tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
if (parents != NULL)
for (j = 0; parents[j] >= 0; j++)
{
DPRINT(("pmatch[%d] parent %d\n", i, parents[j]));
if (pmatch[i].rm_so < pmatch[parents[j]].rm_so
|| pmatch[i].rm_eo > pmatch[parents[j]].rm_eo)
pmatch[i].rm_so = pmatch[i].rm_eo = -1;
@ -1057,19 +976,16 @@ tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
Wrapper functions for POSIX compatible regexp matching.
*/
static int
tre_match(const tre_tnfa_t *tnfa, const void *string, size_t len,
int
regexec(const regex_t *preg, const char *string,
size_t nmatch, regmatch_t pmatch[], int eflags)
{
tre_tnfa_t *tnfa = (void *)preg->TRE_REGEX_T_FIELD;
reg_errcode_t status;
int *tags = NULL, eo;
if (tnfa->num_tags > 0 && nmatch > 0)
{
#ifdef TRE_USE_ALLOCA
tags = alloca(sizeof(*tags) * tnfa->num_tags);
#else /* !TRE_USE_ALLOCA */
tags = xmalloc(sizeof(*tags) * tnfa->num_tags);
#endif /* !TRE_USE_ALLOCA */
if (tags == NULL)
return REG_ESPACE;
}
@ -1078,30 +994,18 @@ tre_match(const tre_tnfa_t *tnfa, const void *string, size_t len,
if (tnfa->have_backrefs)
{
/* The regex has back references, use the backtracking matcher. */
status = tre_tnfa_run_backtrack(tnfa, string, len, tags, eflags, &eo);
status = tre_tnfa_run_backtrack(tnfa, string, tags, eflags, &eo);
}
else
{
/* Exact matching, no back references, use the parallel matcher. */
status = tre_tnfa_run_parallel(tnfa, string, len, tags, eflags, &eo);
status = tre_tnfa_run_parallel(tnfa, string, tags, eflags, &eo);
}
if (status == REG_OK)
/* A match was found, so fill the submatch registers. */
tre_fill_pmatch(nmatch, pmatch, tnfa->cflags, tnfa, tags, eo);
#ifndef TRE_USE_ALLOCA
if (tags)
xfree(tags);
#endif /* !TRE_USE_ALLOCA */
return status;
}
int
regexec(const regex_t *preg, const char *str,
size_t nmatch, regmatch_t pmatch[], int eflags)
{
return tre_match((void *)preg->TRE_REGEX_T_FIELD, str, -1,
nmatch, pmatch, eflags);
}
/* EOF */

61
src/regex/tre-mem.c
View File

@ -1,21 +1,31 @@
/*
tre-mem.c - TRE memory allocator
Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>
Copyright (c) 2001-2009 Ville Laurikari <vl@iki.fi>
All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
@ -31,6 +41,12 @@
#include "tre.h"
/*
This memory allocator is for allocating small memory blocks efficiently
in terms of memory overhead and execution speed. The allocated blocks
cannot be freed individually, only all at once. There can be multiple
allocators, though.
*/
/* Returns a new memory allocator or NULL if out of memory. */
tre_mem_t
@ -77,24 +93,9 @@ tre_mem_alloc_impl(tre_mem_t mem, int provided, void *provided_block,
if (mem->failed)
{
DPRINT(("tre_mem_alloc: oops, called after failure?!\n"));
return NULL;
}
#ifdef MALLOC_DEBUGGING
if (!provided)
{
ptr = xmalloc(1);
if (ptr == NULL)
{
DPRINT(("tre_mem_alloc: xmalloc forced failure\n"));
mem->failed = 1;
return NULL;
}
xfree(ptr);
}
#endif /* MALLOC_DEBUGGING */
if (mem->n < size)
{
/* We need more memory than is available in the current block.
@ -102,10 +103,8 @@ tre_mem_alloc_impl(tre_mem_t mem, int provided, void *provided_block,
tre_list_t *l;
if (provided)
{
DPRINT(("tre_mem_alloc: using provided block\n"));
if (provided_block == NULL)
{
DPRINT(("tre_mem_alloc: provided block was NULL\n"));
mem->failed = 1;
return NULL;
}
@ -119,8 +118,6 @@ tre_mem_alloc_impl(tre_mem_t mem, int provided, void *provided_block,
block_size = size * 8;
else
block_size = TRE_MEM_BLOCK_SIZE;
DPRINT(("tre_mem_alloc: allocating new %d byte block\n",
block_size));
l = xmalloc(sizeof(*l));
if (l == NULL)
{
@ -159,5 +156,3 @@ tre_mem_alloc_impl(tre_mem_t mem, int provided, void *provided_block,
return ptr;
}
/* EOF */

93
src/regex/tre.h
View File

@ -1,21 +1,31 @@
/*
tre-internal.h - TRE internal definitions
Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>.
Copyright (c) 2001-2009 Ville Laurikari <vl@iki.fi>
All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
@ -23,12 +33,7 @@
#include <wchar.h>
#include <wctype.h>
#define TRE_MULTIBYTE 1
#undef TRE_MBSTATE
#define TRE_WCHAR 1
#define TRE_USE_SYSTEM_WCTYPE 1
#define HAVE_WCSTOMBS 1
#define TRE_MB_CUR_MAX MB_CUR_MAX
#define NDEBUG
@ -37,33 +42,16 @@ typedef int reg_errcode_t;
typedef wchar_t tre_char_t;
#ifdef TRE_DEBUG
#include <stdio.h>
#define DPRINT(msg) do {printf msg; fflush(stdout);} while(0)
#else /* !TRE_DEBUG */
#define DPRINT(msg) do { } while(0)
#endif /* !TRE_DEBUG */
#define elementsof(x) ( sizeof(x) / sizeof(x[0]) )
#if 1
int __mbtowc(wchar_t *, const char *);
#define tre_mbrtowc(pwc, s, n, ps) (__mbtowc((pwc), (s)))
#else
#define tre_mbrtowc(pwc, s, n, ps) (mbtowc((pwc), (s), (n)))
#endif
/* Wide characters. */
typedef wint_t tre_cint_t;
#define TRE_CHAR_MAX WCHAR_MAX
#ifdef TRE_MULTIBYTE
#define TRE_MB_CUR_MAX MB_CUR_MAX
#else /* !TRE_MULTIBYTE */
#define TRE_MB_CUR_MAX 1
#endif /* !TRE_MULTIBYTE */
#define tre_isalnum iswalnum
#define tre_isalpha iswalpha
#define tre_isblank iswblank
@ -98,9 +86,6 @@ typedef wctype_t tre_ctype_t;
#define MAX(a, b) (((a) >= (b)) ? (a) : (b))
#define MIN(a, b) (((a) <= (b)) ? (a) : (b))
/* Define STRF to the correct printf formatter for strings. */
#define STRF "ls"
/* TNFA transition type. A TNFA state is an array of transitions,
the terminator is a transition with NULL `state'. */
typedef struct tnfa_transition tre_tnfa_transition_t;
@ -170,42 +155,21 @@ struct tnfa {
tre_tnfa_transition_t *initial;
tre_tnfa_transition_t *final;
tre_submatch_data_t *submatch_data;
char *firstpos_chars;
int first_char;
unsigned int num_submatches;
tre_tag_direction_t *tag_directions;
int *minimal_tags;
int num_tags;
int num_minimals;
int end_tag;
int num_states;
int cflags;
int have_backrefs;
int have_approx;
int params_depth;
};
#if 0
static int
tre_compile(regex_t *preg, const tre_char_t *regex, size_t n, int cflags);
static void
tre_free(regex_t *preg);
static void
tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags,
const tre_tnfa_t *tnfa, int *tags, int match_eo);
static reg_errcode_t
tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
tre_str_type_t type, int *match_tags, int eflags,
int *match_end_ofs);
static reg_errcode_t
tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len,
tre_str_type_t type, int *match_tags, int eflags,
int *match_end_ofs);
static reg_errcode_t
tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
int len, tre_str_type_t type, int *match_tags,
int eflags, int *match_end_ofs);
#endif
/* from tre-mem.h: */
#define TRE_MEM_BLOCK_SIZE 1024
@ -266,4 +230,3 @@ void tre_mem_destroy(tre_mem_t mem);
#define xfree free
#define xrealloc realloc
/* EOF */