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php_pcre.c
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2008 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Andrei Zmievski <andrei@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "php_ini.h"
#include "php_globals.h"
#include "php_pcre.h"
#include "ext/standard/info.h"
#include "ext/standard/php_smart_str.h"
#if HAVE_PCRE || HAVE_BUNDLED_PCRE
#include "ext/standard/php_string.h"
#define PREG_PATTERN_ORDER 1
#define PREG_SET_ORDER 2
#define PREG_OFFSET_CAPTURE (1<<8)
#define PREG_SPLIT_NO_EMPTY (1<<0)
#define PREG_SPLIT_DELIM_CAPTURE (1<<1)
#define PREG_SPLIT_OFFSET_CAPTURE (1<<2)
#define PREG_REPLACE_EVAL (1<<0)
#define PREG_GREP_INVERT (1<<0)
#define PCRE_CACHE_SIZE 4096
enum {
PHP_PCRE_NO_ERROR = 0,
PHP_PCRE_INTERNAL_ERROR,
PHP_PCRE_BACKTRACK_LIMIT_ERROR,
PHP_PCRE_RECURSION_LIMIT_ERROR,
PHP_PCRE_BAD_UTF8_ERROR,
PHP_PCRE_BAD_UTF8_OFFSET_ERROR
};
ZEND_DECLARE_MODULE_GLOBALS(pcre)
static void pcre_handle_exec_error(int pcre_code TSRMLS_DC) /* {{{ */
{
int preg_code = 0;
switch (pcre_code) {
case PCRE_ERROR_MATCHLIMIT:
preg_code = PHP_PCRE_BACKTRACK_LIMIT_ERROR;
break;
case PCRE_ERROR_RECURSIONLIMIT:
preg_code = PHP_PCRE_RECURSION_LIMIT_ERROR;
break;
case PCRE_ERROR_BADUTF8:
preg_code = PHP_PCRE_BAD_UTF8_ERROR;
break;
case PCRE_ERROR_BADUTF8_OFFSET:
preg_code = PHP_PCRE_BAD_UTF8_OFFSET_ERROR;
break;
default:
preg_code = PHP_PCRE_INTERNAL_ERROR;
break;
}
PCRE_G(error_code) = preg_code;
}
/* }}} */
static void php_free_pcre_cache(void *data) /* {{{ */
{
pcre_cache_entry *pce = (pcre_cache_entry *) data;
if (!pce) return;
pefree(pce->re, 1);
if (pce->extra) pefree(pce->extra, 1);
#if HAVE_SETLOCALE
if ((void*)pce->tables) pefree((void*)pce->tables, 1);
pefree(pce->locale, 1);
#endif
}
/* }}} */
static PHP_GINIT_FUNCTION(pcre) /* {{{ */
{
zend_hash_init(&pcre_globals->pcre_cache, 0, NULL, php_free_pcre_cache, 1);
pcre_globals->backtrack_limit = 0;
pcre_globals->recursion_limit = 0;
pcre_globals->error_code = PHP_PCRE_NO_ERROR;
}
/* }}} */
static PHP_GSHUTDOWN_FUNCTION(pcre) /* {{{ */
{
zend_hash_destroy(&pcre_globals->pcre_cache);
}
/* }}} */
PHP_INI_BEGIN()
STD_PHP_INI_ENTRY("pcre.backtrack_limit", "100000", PHP_INI_ALL, OnUpdateLong, backtrack_limit, zend_pcre_globals, pcre_globals)
STD_PHP_INI_ENTRY("pcre.recursion_limit", "100000", PHP_INI_ALL, OnUpdateLong, recursion_limit, zend_pcre_globals, pcre_globals)
PHP_INI_END()
/* {{{ PHP_MINFO_FUNCTION(pcre) */
static PHP_MINFO_FUNCTION(pcre)
{
php_info_print_table_start();
php_info_print_table_row(2, "PCRE (Perl Compatible Regular Expressions) Support", "enabled" );
php_info_print_table_row(2, "PCRE Library Version", pcre_version() );
php_info_print_table_end();
DISPLAY_INI_ENTRIES();
}
/* }}} */
/* {{{ PHP_MINIT_FUNCTION(pcre) */
static PHP_MINIT_FUNCTION(pcre)
{
REGISTER_INI_ENTRIES();
REGISTER_LONG_CONSTANT("PREG_PATTERN_ORDER", PREG_PATTERN_ORDER, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_SET_ORDER", PREG_SET_ORDER, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_OFFSET_CAPTURE", PREG_OFFSET_CAPTURE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_SPLIT_NO_EMPTY", PREG_SPLIT_NO_EMPTY, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_SPLIT_DELIM_CAPTURE", PREG_SPLIT_DELIM_CAPTURE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_SPLIT_OFFSET_CAPTURE", PREG_SPLIT_OFFSET_CAPTURE, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_GREP_INVERT", PREG_GREP_INVERT, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_NO_ERROR", PHP_PCRE_NO_ERROR, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_INTERNAL_ERROR", PHP_PCRE_INTERNAL_ERROR, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_BACKTRACK_LIMIT_ERROR", PHP_PCRE_BACKTRACK_LIMIT_ERROR, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_RECURSION_LIMIT_ERROR", PHP_PCRE_RECURSION_LIMIT_ERROR, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_BAD_UTF8_ERROR", PHP_PCRE_BAD_UTF8_ERROR, CONST_CS | CONST_PERSISTENT);
REGISTER_LONG_CONSTANT("PREG_BAD_UTF8_OFFSET_ERROR", PHP_PCRE_BAD_UTF8_OFFSET_ERROR, CONST_CS | CONST_PERSISTENT);
REGISTER_STRING_CONSTANT("PCRE_VERSION", (char *)pcre_version(), CONST_CS | CONST_PERSISTENT);
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MSHUTDOWN_FUNCTION(pcre) */
static PHP_MSHUTDOWN_FUNCTION(pcre)
{
UNREGISTER_INI_ENTRIES();
return SUCCESS;
}
/* }}} */
/* {{{ static pcre_clean_cache */
static int pcre_clean_cache(void *data, void *arg TSRMLS_DC)
{
int *num_clean = (int *)arg;
if (*num_clean > 0) {
(*num_clean)--;
return 1;
} else {
return 0;
}
}
/* }}} */
/* {{{ static make_subpats_table */
static char **make_subpats_table(int num_subpats, pcre_cache_entry *pce TSRMLS_DC)
{
pcre_extra *extra = pce->extra;
int name_cnt = 0, name_size, ni = 0;
int rc;
char *name_table;
unsigned short name_idx;
char **subpat_names = (char **)ecalloc(num_subpats, sizeof(char *));
rc = pcre_fullinfo(pce->re, extra, PCRE_INFO_NAMECOUNT, &name_cnt);
if (rc < 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Internal pcre_fullinfo() error %d", rc);
efree(subpat_names);
return NULL;
}
if (name_cnt > 0) {
int rc1, rc2;
rc1 = pcre_fullinfo(pce->re, extra, PCRE_INFO_NAMETABLE, &name_table);
rc2 = pcre_fullinfo(pce->re, extra, PCRE_INFO_NAMEENTRYSIZE, &name_size);
rc = rc2 ? rc2 : rc1;
if (rc < 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Internal pcre_fullinfo() error %d", rc);
efree(subpat_names);
return NULL;
}
while (ni++ < name_cnt) {
name_idx = 0xff * name_table[0] + name_table[1];
subpat_names[name_idx] = name_table + 2;
if (is_numeric_string(subpat_names[name_idx], strlen(subpat_names[name_idx]), NULL, NULL, 0) > 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Numeric named subpatterns are not allowed");
efree(subpat_names);
return NULL;
}
name_table += name_size;
}
}
return subpat_names;
}
/* }}} */
/* {{{ pcre_get_compiled_regex_cache
*/
PHPAPI pcre_cache_entry* pcre_get_compiled_regex_cache(char *regex, int regex_len TSRMLS_DC)
{
pcre *re = NULL;
pcre_extra *extra;
int coptions = 0;
int soptions = 0;
const char *error;
int erroffset;
char delimiter;
char start_delimiter;
char end_delimiter;
char *p, *pp;
char *pattern;
int do_study = 0;
int poptions = 0;
unsigned const char *tables = NULL;
#if HAVE_SETLOCALE
char *locale = setlocale(LC_CTYPE, NULL);
#endif
pcre_cache_entry *pce;
pcre_cache_entry new_entry;
/* Try to lookup the cached regex entry, and if successful, just pass
back the compiled pattern, otherwise go on and compile it. */
if (zend_hash_find(&PCRE_G(pcre_cache), regex, regex_len+1, (void **)&pce) == SUCCESS) {
/*
* We use a quick pcre_info() check to see whether cache is corrupted, and if it
* is, we flush it and compile the pattern from scratch.
*/
if (pcre_info(pce->re, NULL, NULL) == PCRE_ERROR_BADMAGIC) {
zend_hash_clean(&PCRE_G(pcre_cache));
} else {
#if HAVE_SETLOCALE
if (!strcmp(pce->locale, locale)) {
#endif
return pce;
#if HAVE_SETLOCALE
}
#endif
}
}
p = regex;
/* Parse through the leading whitespace, and display a warning if we
get to the end without encountering a delimiter. */
while (isspace((int)*(unsigned char *)p)) p++;
if (*p == 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Empty regular expression");
return NULL;
}
/* Get the delimiter and display a warning if it is alphanumeric
or a backslash. */
delimiter = *p++;
if (isalnum((int)*(unsigned char *)&delimiter) || delimiter == '\\') {
php_error_docref(NULL TSRMLS_CC,E_WARNING, "Delimiter must not be alphanumeric or backslash");
return NULL;
}
start_delimiter = delimiter;
if ((pp = strchr("([{< )]}> )]}>", delimiter)))
delimiter = pp[5];
end_delimiter = delimiter;
if (start_delimiter == end_delimiter) {
/* We need to iterate through the pattern, searching for the ending delimiter,
but skipping the backslashed delimiters. If the ending delimiter is not
found, display a warning. */
pp = p;
while (*pp != 0) {
if (*pp == '\\' && pp[1] != 0) pp++;
else if (*pp == delimiter)
break;
pp++;
}
if (*pp == 0) {
php_error_docref(NULL TSRMLS_CC,E_WARNING, "No ending delimiter '%c' found", delimiter);
return NULL;
}
} else {
/* We iterate through the pattern, searching for the matching ending
* delimiter. For each matching starting delimiter, we increment nesting
* level, and decrement it for each matching ending delimiter. If we
* reach the end of the pattern without matching, display a warning.
*/
int brackets = 1; /* brackets nesting level */
pp = p;
while (*pp != 0) {
if (*pp == '\\' && pp[1] != 0) pp++;
else if (*pp == end_delimiter && --brackets <= 0)
break;
else if (*pp == start_delimiter)
brackets++;
pp++;
}
if (*pp == 0) {
php_error_docref(NULL TSRMLS_CC,E_WARNING, "No ending matching delimiter '%c' found", end_delimiter);
return NULL;
}
}
/* Make a copy of the actual pattern. */
pattern = estrndup(p, pp-p);
/* Move on to the options */
pp++;
/* Parse through the options, setting appropriate flags. Display
a warning if we encounter an unknown modifier. */
while (*pp != 0) {
switch (*pp++) {
/* Perl compatible options */
case 'i': coptions |= PCRE_CASELESS; break;
case 'm': coptions |= PCRE_MULTILINE; break;
case 's': coptions |= PCRE_DOTALL; break;
case 'x': coptions |= PCRE_EXTENDED; break;
/* PCRE specific options */
case 'A': coptions |= PCRE_ANCHORED; break;
case 'D': coptions |= PCRE_DOLLAR_ENDONLY;break;
case 'S': do_study = 1; break;
case 'U': coptions |= PCRE_UNGREEDY; break;
case 'X': coptions |= PCRE_EXTRA; break;
case 'u': coptions |= PCRE_UTF8; break;
/* Custom preg options */
case 'e': poptions |= PREG_REPLACE_EVAL; break;
case ' ':
case '\n':
break;
default:
php_error_docref(NULL TSRMLS_CC,E_WARNING, "Unknown modifier '%c'", pp[-1]);
efree(pattern);
return NULL;
}
}
#if HAVE_SETLOCALE
if (strcmp(locale, "C"))
tables = pcre_maketables();
#endif
/* Compile pattern and display a warning if compilation failed. */
re = pcre_compile(pattern,
coptions,
&error,
&erroffset,
tables);
if (re == NULL) {
php_error_docref(NULL TSRMLS_CC,E_WARNING, "Compilation failed: %s at offset %d", error, erroffset);
efree(pattern);
if (tables) {
pefree((void*)tables, 1);
}
return NULL;
}
/* If study option was specified, study the pattern and
store the result in extra for passing to pcre_exec. */
if (do_study) {
extra = pcre_study(re, soptions, &error);
if (extra) {
extra->flags |= PCRE_EXTRA_MATCH_LIMIT | PCRE_EXTRA_MATCH_LIMIT_RECURSION;
}
if (error != NULL) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error while studying pattern");
}
} else {
extra = NULL;
}
efree(pattern);
/*
* If we reached cache limit, clean out the items from the head of the list;
* these are supposedly the oldest ones (but not necessarily the least used
* ones).
*/
if (zend_hash_num_elements(&PCRE_G(pcre_cache)) == PCRE_CACHE_SIZE) {
int num_clean = PCRE_CACHE_SIZE / 8;
zend_hash_apply_with_argument(&PCRE_G(pcre_cache), pcre_clean_cache, &num_clean TSRMLS_CC);
}
/* Store the compiled pattern and extra info in the cache. */
new_entry.re = re;
new_entry.extra = extra;
new_entry.preg_options = poptions;
new_entry.compile_options = coptions;
#if HAVE_SETLOCALE
new_entry.locale = pestrdup(locale, 1);
new_entry.tables = tables;
#endif
zend_hash_update(&PCRE_G(pcre_cache), regex, regex_len+1, (void *)&new_entry,
sizeof(pcre_cache_entry), (void**)&pce);
return pce;
}
/* }}} */
/* {{{ pcre_get_compiled_regex
*/
PHPAPI pcre* pcre_get_compiled_regex(char *regex, pcre_extra **extra, int *preg_options TSRMLS_DC)
{
pcre_cache_entry * pce = pcre_get_compiled_regex_cache(regex, strlen(regex) TSRMLS_CC);
if (extra) {
*extra = pce ? pce->extra : NULL;
}
if (preg_options) {
*preg_options = pce ? pce->preg_options : 0;
}
return pce ? pce->re : NULL;
}
/* }}} */
/* {{{ pcre_get_compiled_regex_ex
*/
PHPAPI pcre* pcre_get_compiled_regex_ex(char *regex, pcre_extra **extra, int *preg_options, int *compile_options TSRMLS_DC)
{
pcre_cache_entry * pce = pcre_get_compiled_regex_cache(regex, strlen(regex) TSRMLS_CC);
if (extra) {
*extra = pce ? pce->extra : NULL;
}
if (preg_options) {
*preg_options = pce ? pce->preg_options : 0;
}
if (compile_options) {
*compile_options = pce ? pce->compile_options : 0;
}
return pce ? pce->re : NULL;
}
/* }}} */
/* {{{ add_offset_pair */
static inline void add_offset_pair(zval *result, char *str, int len, int offset, char *name)
{
zval *match_pair;
ALLOC_ZVAL(match_pair);
array_init(match_pair);
INIT_PZVAL(match_pair);
/* Add (match, offset) to the return value */
add_next_index_stringl(match_pair, str, len, 1);
add_next_index_long(match_pair, offset);
if (name) {
zval_add_ref(&match_pair);
zend_hash_update(Z_ARRVAL_P(result), name, strlen(name)+1, &match_pair, sizeof(zval *), NULL);
}
zend_hash_next_index_insert(Z_ARRVAL_P(result), &match_pair, sizeof(zval *), NULL);
}
/* }}} */
static void php_do_pcre_match(INTERNAL_FUNCTION_PARAMETERS, int global) /* {{{ */
{
/* parameters */
char *regex; /* Regular expression */
char *subject; /* String to match against */
int regex_len;
int subject_len;
pcre_cache_entry *pce; /* Compiled regular expression */
zval *subpats = NULL; /* Array for subpatterns */
long flags = 0; /* Match control flags */
long start_offset = 0; /* Where the new search starts */
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, ((global) ? "ssz|ll" : "ss|zll"), ®ex, ®ex_len,
&subject, &subject_len, &subpats, &flags, &start_offset) == FAILURE) {
RETURN_FALSE;
}
/* Compile regex or get it from cache. */
if ((pce = pcre_get_compiled_regex_cache(regex, regex_len TSRMLS_CC)) == NULL) {
RETURN_FALSE;
}
php_pcre_match_impl(pce, subject, subject_len, return_value, subpats,
global, ZEND_NUM_ARGS() >= 4, flags, start_offset TSRMLS_CC);
}
/* }}} */
/* {{{ php_pcre_match_impl() */
PHPAPI void php_pcre_match_impl(pcre_cache_entry *pce, char *subject, int subject_len, zval *return_value,
zval *subpats, int global, int use_flags, long flags, long start_offset TSRMLS_DC)
{
zval *result_set, /* Holds a set of subpatterns after
a global match */
**match_sets = NULL; /* An array of sets of matches for each
subpattern after a global match */
pcre_extra *extra = pce->extra;/* Holds results of studying */
pcre_extra extra_data; /* Used locally for exec options */
int exoptions = 0; /* Execution options */
int count = 0; /* Count of matched subpatterns */
int *offsets; /* Array of subpattern offsets */
int num_subpats; /* Number of captured subpatterns */
int size_offsets; /* Size of the offsets array */
int matched; /* Has anything matched */
int g_notempty = 0; /* If the match should not be empty */
const char **stringlist; /* Holds list of subpatterns */
char *match; /* The current match */
char **subpat_names; /* Array for named subpatterns */
int i, rc;
int subpats_order; /* Order of subpattern matches */
int offset_capture; /* Capture match offsets: yes/no */
/* Overwrite the passed-in value for subpatterns with an empty array. */
if (subpats != NULL) {
zval_dtor(subpats);
array_init(subpats);
}
subpats_order = global ? PREG_PATTERN_ORDER : 0;
if (use_flags) {
offset_capture = flags & PREG_OFFSET_CAPTURE;
/*
* subpats_order is pre-set to pattern mode so we change it only if
* necessary.
*/
if (flags & 0xff) {
subpats_order = flags & 0xff;
}
if ((global && (subpats_order < PREG_PATTERN_ORDER || subpats_order > PREG_SET_ORDER)) ||
(!global && subpats_order != 0)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid flags specified");
return;
}
} else {
offset_capture = 0;
}
/* Negative offset counts from the end of the string. */
if (start_offset < 0) {
start_offset = subject_len + start_offset;
if (start_offset < 0) {
start_offset = 0;
}
}
if (extra == NULL) {
extra_data.flags = PCRE_EXTRA_MATCH_LIMIT | PCRE_EXTRA_MATCH_LIMIT_RECURSION;
extra = &extra_data;
}
extra->match_limit = PCRE_G(backtrack_limit);
extra->match_limit_recursion = PCRE_G(recursion_limit);
/* Calculate the size of the offsets array, and allocate memory for it. */
rc = pcre_fullinfo(pce->re, extra, PCRE_INFO_CAPTURECOUNT, &num_subpats);
if (rc < 0) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Internal pcre_fullinfo() error %d", rc);
RETURN_FALSE;
}
num_subpats++;
size_offsets = num_subpats * 3;
/*
* Build a mapping from subpattern numbers to their names. We will always
* allocate the table, even though there may be no named subpatterns. This
* avoids somewhat more complicated logic in the inner loops.
*/
subpat_names = make_subpats_table(num_subpats, pce TSRMLS_CC);
if (!subpat_names) {
RETURN_FALSE;
}
offsets = (int *)safe_emalloc(size_offsets, sizeof(int), 0);
/* Allocate match sets array and initialize the values. */
if (global && subpats_order == PREG_PATTERN_ORDER) {
match_sets = (zval **)safe_emalloc(num_subpats, sizeof(zval *), 0);
for (i=0; i<num_subpats; i++) {
ALLOC_ZVAL(match_sets[i]);
array_init(match_sets[i]);
INIT_PZVAL(match_sets[i]);
}
}
match = NULL;
matched = 0;
PCRE_G(error_code) = PHP_PCRE_NO_ERROR;
do {
/* Execute the regular expression. */
count = pcre_exec(pce->re, extra, subject, subject_len, start_offset,
exoptions|g_notempty, offsets, size_offsets);
/* the string was already proved to be valid UTF-8 */
exoptions |= PCRE_NO_UTF8_CHECK;
/* Check for too many substrings condition. */
if (count == 0) {
php_error_docref(NULL TSRMLS_CC, E_NOTICE, "Matched, but too many substrings");
count = size_offsets/3;
}
/* If something has matched */
if (count > 0) {
matched++;
match = subject + offsets[0];
/* If subpatterns array has been passed, fill it in with values. */
if (subpats != NULL) {
/* Try to get the list of substrings and display a warning if failed. */
if (pcre_get_substring_list(subject, offsets, count, &stringlist) < 0) {
efree(subpat_names);
efree(offsets);
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Get subpatterns list failed");
RETURN_FALSE;
}
if (global) { /* global pattern matching */
if (subpats_order == PREG_PATTERN_ORDER) {
/* For each subpattern, insert it into the appropriate array. */
for (i = 0; i < count; i++) {
if (offset_capture) {
add_offset_pair(match_sets[i], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], NULL);
} else {
add_next_index_stringl(match_sets[i], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], 1);
}
}
/*
* If the number of captured subpatterns on this run is
* less than the total possible number, pad the result
* arrays with empty strings.
*/
if (count < num_subpats) {
for (; i < num_subpats; i++) {
add_next_index_string(match_sets[i], "", 1);
}
}
} else {
/* Allocate the result set array */
ALLOC_ZVAL(result_set);
array_init(result_set);
INIT_PZVAL(result_set);
/* Add all the subpatterns to it */
for (i = 0; i < count; i++) {
if (offset_capture) {
add_offset_pair(result_set, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], subpat_names[i]);
} else {
if (subpat_names[i]) {
add_assoc_stringl(result_set, subpat_names[i], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], 1);
}
add_next_index_stringl(result_set, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], 1);
}
}
/* And add it to the output array */
zend_hash_next_index_insert(Z_ARRVAL_P(subpats), &result_set, sizeof(zval *), NULL);
}
} else { /* single pattern matching */
/* For each subpattern, insert it into the subpatterns array. */
for (i = 0; i < count; i++) {
if (offset_capture) {
add_offset_pair(subpats, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1],
offsets[i<<1], subpat_names[i]);
} else {
if (subpat_names[i]) {
add_assoc_stringl(subpats, subpat_names[i], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], 1);
}
add_next_index_stringl(subpats, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], 1);
}
}
}
pcre_free((void *) stringlist);
}
} else if (count == PCRE_ERROR_NOMATCH) {
/* If we previously set PCRE_NOTEMPTY after a null match,
this is not necessarily the end. We need to advance
the start offset, and continue. Fudge the offset values
to achieve this, unless we're already at the end of the string. */
if (g_notempty != 0 && start_offset < subject_len) {
offsets[0] = start_offset;
offsets[1] = start_offset + 1;
} else
break;
} else {
pcre_handle_exec_error(count TSRMLS_CC);
break;
}
/* If we have matched an empty string, mimic what Perl's /g options does.
This turns out to be rather cunning. First we set PCRE_NOTEMPTY and try
the match again at the same point. If this fails (picked up above) we
advance to the next character. */
g_notempty = (offsets[1] == offsets[0])? PCRE_NOTEMPTY | PCRE_ANCHORED : 0;
/* Advance to the position right after the last full match */
start_offset = offsets[1];
} while (global);
/* Add the match sets to the output array and clean up */
if (global && subpats_order == PREG_PATTERN_ORDER) {
for (i = 0; i < num_subpats; i++) {
if (subpat_names[i]) {
zend_hash_update(Z_ARRVAL_P(subpats), subpat_names[i],
strlen(subpat_names[i])+1, &match_sets[i], sizeof(zval *), NULL);
Z_ADDREF_P(match_sets[i]);
}
zend_hash_next_index_insert(Z_ARRVAL_P(subpats), &match_sets[i], sizeof(zval *), NULL);
}
efree(match_sets);
}
efree(offsets);
efree(subpat_names);
RETVAL_LONG(matched);
}
/* }}} */
/* {{{ proto int preg_match(string pattern, string subject [, array &subpatterns [, int flags [, int offset]]])
Perform a Perl-style regular expression match */
static PHP_FUNCTION(preg_match)
{
php_do_pcre_match(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto int preg_match_all(string pattern, string subject, array &subpatterns [, int flags [, int offset]])
Perform a Perl-style global regular expression match */
static PHP_FUNCTION(preg_match_all)
{
php_do_pcre_match(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
/* {{{ preg_get_backref
*/
static int preg_get_backref(char **str, int *backref)
{
register char in_brace = 0;
register char *walk = *str;
if (walk[1] == 0)
return 0;
if (*walk == '$' && walk[1] == '{') {
in_brace = 1;
walk++;
}
walk++;
if (*walk >= '0' && *walk <= '9') {
*backref = *walk - '0';
walk++;
} else
return 0;
if (*walk && *walk >= '0' && *walk <= '9') {
*backref = *backref * 10 + *walk - '0';
walk++;
}
if (in_brace) {
if (*walk == 0 || *walk != '}')
return 0;
else
walk++;
}
*str = walk;
return 1;
}
/* }}} */
/* {{{ preg_do_repl_func
*/
static int preg_do_repl_func(zval *function, char *subject, int *offsets, char **subpat_names, int count, char **result TSRMLS_DC)
{
zval *retval_ptr; /* Function return value */
zval **args[1]; /* Argument to pass to function */
zval *subpats; /* Captured subpatterns */
int result_len; /* Return value length */
int i;
MAKE_STD_ZVAL(subpats);
array_init(subpats);
for (i = 0; i < count; i++) {
if (subpat_names[i]) {
add_assoc_stringl(subpats, subpat_names[i], &subject[offsets[i<<1]] , offsets[(i<<1)+1] - offsets[i<<1], 1);
}
add_next_index_stringl(subpats, &subject[offsets[i<<1]], offsets[(i<<1)+1] - offsets[i<<1], 1);
}
args[0] = &subpats;
if (call_user_function_ex(EG(function_table), NULL, function, &retval_ptr, 1, args, 0, NULL TSRMLS_CC) == SUCCESS && retval_ptr) {
convert_to_string_ex(&retval_ptr);
*result = estrndup(Z_STRVAL_P(retval_ptr), Z_STRLEN_P(retval_ptr));
result_len = Z_STRLEN_P(retval_ptr);
zval_ptr_dtor(&retval_ptr);
} else {
if (!EG(exception)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to call custom replacement function");
}
result_len = offsets[1] - offsets[0];
*result = estrndup(&subject[offsets[0]], result_len);
}
zval_ptr_dtor(&subpats);
return result_len;
}
/* }}} */
/* {{{ preg_do_eval
*/
static int preg_do_eval(char *eval_str, int eval_str_len, char *subject,
int *offsets, int count, char **result TSRMLS_DC)
{
zval retval; /* Return value from evaluation */
char *eval_str_end, /* End of eval string */
*match, /* Current match for a backref */
*esc_match, /* Quote-escaped match */
*walk, /* Used to walk the code string */
*segment, /* Start of segment to append while walking */
walk_last; /* Last walked character */
int match_len; /* Length of the match */
int esc_match_len; /* Length of the quote-escaped match */
int result_len; /* Length of the result of the evaluation */
int backref; /* Current backref */
char *compiled_string_description;
smart_str code = {0};
eval_str_end = eval_str + eval_str_len;
walk = segment = eval_str;
walk_last = 0;
while (walk < eval_str_end) {
/* If found a backreference.. */
if ('\\' == *walk || '$' == *walk) {
smart_str_appendl(&code, segment, walk - segment);
if (walk_last == '\\') {
code.c[code.len-1] = *walk++;
segment = walk;
walk_last = 0;
continue;
}
segment = walk;
if (preg_get_backref(&walk, &backref)) {
if (backref < count) {
/* Find the corresponding string match and substitute it
in instead of the backref */
match = subject + offsets[backref<<1];
match_len = offsets[(backref<<1)+1] - offsets[backref<<1];
if (match_len) {
esc_match = php_addslashes_ex(match, match_len, &esc_match_len, 0, 1 TSRMLS_CC);
} else {
esc_match = match;
esc_match_len = 0;
}
} else {
esc_match = "";
esc_match_len = 0;
match_len = 0;
}
smart_str_appendl(&code, esc_match, esc_match_len);
segment = walk;
/* Clean up and reassign */
if (esc_match_len)
efree(esc_match);
continue;
}
}
walk++;
walk_last = walk[-1];
}
smart_str_appendl(&code, segment, walk - segment);
smart_str_0(&code);
compiled_string_description = zend_make_compiled_string_description("regexp code" TSRMLS_CC);
/* Run the code */
if (zend_eval_string(code.c, &retval, compiled_string_description TSRMLS_CC) == FAILURE) {
efree(compiled_string_description);
php_error_docref(NULL TSRMLS_CC,E_ERROR, "Failed evaluating code: %s%s", PHP_EOL, code.c);
/* zend_error() does not return in this case */
}
efree(compiled_string_description);
convert_to_string(&retval);
/* Save the return value and its length */
*result = estrndup(Z_STRVAL(retval), Z_STRLEN(retval));
result_len = Z_STRLEN(retval);
/* Clean up */
zval_dtor(&retval);
smart_str_free(&code);
return result_len;
}
/* }}} */
/* {{{ php_pcre_replace
*/
PHPAPI char *php_pcre_replace(char *regex, int regex_len,
char *subject, int subject_len,
zval *replace_val, int is_callable_replace,
int *result_len, int limit, int *replace_count TSRMLS_DC)
{
pcre_cache_entry *pce; /* Compiled regular expression */
/* Compile regex or get it from cache. */
if ((pce = pcre_get_compiled_regex_cache(regex, regex_len TSRMLS_CC)) == NULL) {
return NULL;
}
return php_pcre_replace_impl(pce, subject, subject_len, replace_val,
is_callable_replace, result_len, limit, replace_count TSRMLS_CC);
}
/* }}} */
/* {{{ php_pcre_replace_impl() */
PHPAPI char *php_pcre_replace_impl(pcre_cache_entry *pce, char *subject, int subject_len, zval *replace_val,
int is_callable_replace, int *result_len, int limit, int *replace_count TSRMLS_DC)
{
pcre_extra *extra = pce->extra;/* Holds results of studying */
pcre_extra extra_data; /* Used locally for exec options */
int exoptions = 0; /* Execution options */
int count = 0; /* Count of matched subpatterns */
int *offsets; /* Array of subpattern offsets */
char **subpat_names; /* Array for named subpatterns */
int num_subpats; /* Number of captured subpatterns */
int size_offsets; /* Size of the offsets array */
int new_len; /* Length of needed storage */
int alloc_len; /* Actual allocated length */
int eval_result_len=0; /* Length of the eval'ed or
function-returned string */
int match_len; /* Length of the current match */
int backref; /* Backreference number */
int eval; /* If the replacement string should be eval'ed */
int start_offset; /* Where the new search starts */
int g_notempty=0; /* If the match should not be empty */
int replace_len=0; /* Length of replacement string */
char *result, /* Result of replacement */
*replace=NULL, /* Replacement string */
*new_buf, /* Temporary buffer for re-allocation */
*walkbuf, /* Location of current replacement in the result */
*walk, /* Used to walk the replacement string */
*match, /* The current match */
*piece, /* The current piece of subject */
*replace_end=NULL, /* End of replacement string */
*eval_result, /* Result of eval or custom function */
walk_last; /* Last walked character */
int rc;
if (extra == NULL) {
extra_data.flags = PCRE_EXTRA_MATCH_LIMIT | PCRE_EXTRA_MATCH_LIMIT_RECURSION;
extra = &extra_data;
}
extra->match_limit = PCRE_G(backtrack_limit);
extra->match_limit_recursion = PCRE_G(recursion_limit);
eval = pce->preg_options & PREG_REPLACE_EVAL;