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php_pcre.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2017 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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Andrei Zmievski <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "php_ini.h"
#include "php_globals.h"
#include "php_pcre.h"
#include "ext/standard/info.h"
#include "ext/standard/basic_functions.h"
#include "zend_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_UNMATCHED_AS_NULL (1<<9)
#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
/* not fully functional workaround for libpcre < 8.0, see bug #70232 */
#ifndef PCRE_NOTEMPTY_ATSTART
# define PCRE_NOTEMPTY_ATSTART PCRE_NOTEMPTY
#endif
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,
PHP_PCRE_JIT_STACKLIMIT_ERROR
};
PHPAPI ZEND_DECLARE_MODULE_GLOBALS(pcre)
#ifdef HAVE_PCRE_JIT_SUPPORT
#define PCRE_JIT_STACK_MIN_SIZE (32 * 1024)
#define PCRE_JIT_STACK_MAX_SIZE (64 * 1024)
ZEND_TLS pcre_jit_stack *jit_stack = NULL;
#endif
static void pcre_handle_exec_error(int pcre_code) /* {{{ */
{
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;
#ifdef HAVE_PCRE_JIT_SUPPORT
case PCRE_ERROR_JIT_STACKLIMIT:
preg_code = PHP_PCRE_JIT_STACKLIMIT_ERROR;
break;
#endif
default:
preg_code = PHP_PCRE_INTERNAL_ERROR;
break;
}
PCRE_G(error_code) = preg_code;
}
/* }}} */
static void php_free_pcre_cache(zval *data) /* {{{ */
{
pcre_cache_entry *pce = (pcre_cache_entry *) Z_PTR_P(data);
if (!pce) return;
pcre_free(pce->re);
if (pce->extra) {
pcre_free_study(pce->extra);
}
#if HAVE_SETLOCALE
if ((void*)pce->tables) pefree((void*)pce->tables, 1);
#endif
pefree(pce, 1);
}
/* }}} */
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);
#ifdef HAVE_PCRE_JIT_SUPPORT
/* Stack may only be destroyed when no cached patterns
possibly associated with it do exist. */
if (jit_stack) {
pcre_jit_stack_free(jit_stack);
jit_stack = NULL;
}
#endif
}
/* }}} */
PHP_INI_BEGIN()
STD_PHP_INI_ENTRY("pcre.backtrack_limit", "1000000", 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)
#ifdef HAVE_PCRE_JIT_SUPPORT
STD_PHP_INI_ENTRY("pcre.jit", "1", PHP_INI_ALL, OnUpdateBool, jit, zend_pcre_globals, pcre_globals)
#endif
PHP_INI_END()
/* {{{ PHP_MINFO_FUNCTION(pcre) */
static PHP_MINFO_FUNCTION(pcre)
{
#ifdef HAVE_PCRE_JIT_SUPPORT
int jit_yes = 0;
#endif
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() );
#ifdef HAVE_PCRE_JIT_SUPPORT
if (!pcre_config(PCRE_CONFIG_JIT, &jit_yes)) {
php_info_print_table_row(2, "PCRE JIT Support", jit_yes ? "enabled" : "disabled");
} else {
php_info_print_table_row(2, "PCRE JIT Support", "unknown" );
}
#else
php_info_print_table_row(2, "PCRE JIT Support", "not compiled in" );
#endif
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_UNMATCHED_AS_NULL", PREG_UNMATCHED_AS_NULL, 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_LONG_CONSTANT("PREG_JIT_STACKLIMIT_ERROR", PHP_PCRE_JIT_STACKLIMIT_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;
}
/* }}} */
#ifdef HAVE_PCRE_JIT_SUPPORT
/* {{{ PHP_RINIT_FUNCTION(pcre) */
static PHP_RINIT_FUNCTION(pcre)
{
if (PCRE_G(jit) && jit_stack == NULL) {
jit_stack = pcre_jit_stack_alloc(PCRE_JIT_STACK_MIN_SIZE,PCRE_JIT_STACK_MAX_SIZE);
}
return SUCCESS;
}
/* }}} */
#endif
/* {{{ static pcre_clean_cache */
static int pcre_clean_cache(zval *data, void *arg)
{
pcre_cache_entry *pce = (pcre_cache_entry *) Z_PTR_P(data);
int *num_clean = (int *)arg;
if (*num_clean > 0 && !pce->refcount) {
(*num_clean)--;
return ZEND_HASH_APPLY_REMOVE;
} else {
return ZEND_HASH_APPLY_KEEP;
}
}
/* }}} */
/* {{{ static make_subpats_table */
static char **make_subpats_table(int num_subpats, pcre_cache_entry *pce)
{
pcre_extra *extra = pce->extra;
int name_cnt = pce->name_count, name_size, ni = 0;
int rc;
char *name_table;
unsigned short name_idx;
char **subpat_names;
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, E_WARNING, "Internal pcre_fullinfo() error %d", rc);
return NULL;
}
subpat_names = (char **)ecalloc(num_subpats, sizeof(char *));
while (ni++ < name_cnt) {
name_idx = 0x100 * (unsigned char)name_table[0] + (unsigned char)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, E_WARNING, "Numeric named subpatterns are not allowed");
efree(subpat_names);
return NULL;
}
name_table += name_size;
}
return subpat_names;
}
/* }}} */
/* {{{ static calculate_unit_length */
/* Calculates the byte length of the next character. Assumes valid UTF-8 for PCRE_UTF8. */
static zend_always_inline int calculate_unit_length(pcre_cache_entry *pce, char *start)
{
int unit_len;
if (pce->compile_options & PCRE_UTF8) {
char *end = start;
/* skip continuation bytes */
while ((*++end & 0xC0) == 0x80);
unit_len = end - start;
} else {
unit_len = 1;
}
return unit_len;
}
/* }}} */
/* {{{ pcre_get_compiled_regex_cache
*/
PHPAPI pcre_cache_entry* pcre_get_compiled_regex_cache(zend_string *regex)
{
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;
pcre_cache_entry *pce;
pcre_cache_entry new_entry;
int rc;
zend_string *key;
#if HAVE_SETLOCALE
if (BG(locale_string) &&
(ZSTR_LEN(BG(locale_string)) != 1 && ZSTR_VAL(BG(locale_string))[0] != 'C')) {
key = zend_string_alloc(ZSTR_LEN(regex) + ZSTR_LEN(BG(locale_string)) + 1, 0);
memcpy(ZSTR_VAL(key), ZSTR_VAL(BG(locale_string)), ZSTR_LEN(BG(locale_string)) + 1);
memcpy(ZSTR_VAL(key) + ZSTR_LEN(BG(locale_string)), ZSTR_VAL(regex), ZSTR_LEN(regex) + 1);
} else
#endif
{
key = regex;
}
/* Try to lookup the cached regex entry, and if successful, just pass
back the compiled pattern, otherwise go on and compile it. */
pce = zend_hash_find_ptr(&PCRE_G(pcre_cache), key);
if (pce) {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
return pce;
}
p = ZSTR_VAL(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) {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
php_error_docref(NULL, E_WARNING,
p < ZSTR_VAL(regex) + ZSTR_LEN(regex) ? "Null byte in regex" : "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 == '\\') {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
php_error_docref(NULL,E_WARNING, "Delimiter must not be alphanumeric or backslash");
return NULL;
}
start_delimiter = delimiter;
if ((pp = strchr("([{< )]}> )]}>", delimiter)))
delimiter = pp[5];
end_delimiter = delimiter;
pp = p;
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. */
while (*pp != 0) {
if (*pp == '\\' && pp[1] != 0) pp++;
else if (*pp == delimiter)
break;
pp++;
}
} 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 */
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) {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
if (pp < ZSTR_VAL(regex) + ZSTR_LEN(regex)) {
php_error_docref(NULL,E_WARNING, "Null byte in regex");
} else if (start_delimiter == end_delimiter) {
php_error_docref(NULL,E_WARNING, "No ending delimiter '%c' found", delimiter);
} else {
php_error_docref(NULL,E_WARNING, "No ending matching delimiter '%c' found", 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 < ZSTR_VAL(regex) + ZSTR_LEN(regex)) {
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;
/* In PCRE, by default, \d, \D, \s, \S, \w, and \W recognize only ASCII
characters, even in UTF-8 mode. However, this can be changed by setting
the PCRE_UCP option. */
#ifdef PCRE_UCP
coptions |= PCRE_UCP;
#endif
break;
case 'J': coptions |= PCRE_DUPNAMES; break;
/* Custom preg options */
case 'e': poptions |= PREG_REPLACE_EVAL; break;
case ' ':
case '\n':
break;
default:
if (pp[-1]) {
php_error_docref(NULL,E_WARNING, "Unknown modifier '%c'", pp[-1]);
} else {
php_error_docref(NULL,E_WARNING, "Null byte in regex");
}
efree(pattern);
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
return NULL;
}
}
#if HAVE_SETLOCALE
if (key != regex) {
tables = pcre_maketables();
}
#endif
/* Compile pattern and display a warning if compilation failed. */
re = pcre_compile(pattern,
coptions,
&error,
&erroffset,
tables);
if (re == NULL) {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
php_error_docref(NULL,E_WARNING, "Compilation failed: %s at offset %d", error, erroffset);
efree(pattern);
if (tables) {
pefree((void*)tables, 1);
}
return NULL;
}
#ifdef HAVE_PCRE_JIT_SUPPORT
if (PCRE_G(jit)) {
/* Enable PCRE JIT compiler */
do_study = 1;
soptions |= PCRE_STUDY_JIT_COMPILE;
}
#endif
/* 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;
extra->match_limit = (unsigned long)PCRE_G(backtrack_limit);
extra->match_limit_recursion = (unsigned long)PCRE_G(recursion_limit);
#ifdef HAVE_PCRE_JIT_SUPPORT
if (PCRE_G(jit) && jit_stack) {
pcre_assign_jit_stack(extra, NULL, jit_stack);
}
#endif
}
if (error != NULL) {
php_error_docref(NULL, 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 (!pce && 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);
}
/* 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.tables = tables;
#endif
new_entry.refcount = 0;
rc = pcre_fullinfo(re, extra, PCRE_INFO_CAPTURECOUNT, &new_entry.capture_count);
if (rc < 0) {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
php_error_docref(NULL, E_WARNING, "Internal pcre_fullinfo() error %d", rc);
return NULL;
}
rc = pcre_fullinfo(re, extra, PCRE_INFO_NAMECOUNT, &new_entry.name_count);
if (rc < 0) {
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
php_error_docref(NULL, E_WARNING, "Internal pcre_fullinfo() error %d", rc);
return NULL;
}
/*
* Interned strings are not duplicated when stored in HashTable,
* but all the interned strings created during HTTP request are removed
* at end of request. However PCRE_G(pcre_cache) must be consistent
* on the next request as well. So we disable usage of interned strings
* as hash keys especually for this table.
* See bug #63180
*/
if (!ZSTR_IS_INTERNED(key) || !(GC_FLAGS(key) & IS_STR_PERMANENT)) {
pce = zend_hash_str_update_mem(&PCRE_G(pcre_cache),
ZSTR_VAL(key), ZSTR_LEN(key), &new_entry, sizeof(pcre_cache_entry));
#if HAVE_SETLOCALE
if (key != regex) {
zend_string_release(key);
}
#endif
} else {
pce = zend_hash_update_mem(&PCRE_G(pcre_cache), key, &new_entry, sizeof(pcre_cache_entry));
}
return pce;
}
/* }}} */
/* {{{ pcre_get_compiled_regex
*/
PHPAPI pcre* pcre_get_compiled_regex(zend_string *regex, pcre_extra **extra, int *preg_options)
{
pcre_cache_entry * pce = pcre_get_compiled_regex_cache(regex);
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(zend_string *regex, pcre_extra **extra, int *preg_options, int *compile_options)
{
pcre_cache_entry * pce = pcre_get_compiled_regex_cache(regex);
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, int unmatched_as_null)
{
zval match_pair, tmp;
array_init_size(&match_pair, 2);
/* Add (match, offset) to the return value */
if (offset < 0) {
if (unmatched_as_null) {
ZVAL_NULL(&tmp);
} else {
ZVAL_EMPTY_STRING(&tmp);
}
} else {
ZVAL_STRINGL(&tmp, str, len);
}
zend_hash_next_index_insert_new(Z_ARRVAL(match_pair), &tmp);
ZVAL_LONG(&tmp, offset);
zend_hash_next_index_insert_new(Z_ARRVAL(match_pair), &tmp);
if (name) {
Z_ADDREF(match_pair);
zend_hash_str_update(Z_ARRVAL_P(result), name, strlen(name), &match_pair);
}
zend_hash_next_index_insert(Z_ARRVAL_P(result), &match_pair);
}
/* }}} */
static void php_do_pcre_match(INTERNAL_FUNCTION_PARAMETERS, int global) /* {{{ */
{
/* parameters */
zend_string *regex; /* Regular expression */
zend_string *subject; /* String to match against */
pcre_cache_entry *pce; /* Compiled regular expression */
zval *subpats = NULL; /* Array for subpatterns */
zend_long flags = 0; /* Match control flags */
zend_long start_offset = 0; /* Where the new search starts */
ZEND_PARSE_PARAMETERS_START(2, 5)
Z_PARAM_STR(regex)
Z_PARAM_STR(subject)
Z_PARAM_OPTIONAL
Z_PARAM_ZVAL_DEREF(subpats)
Z_PARAM_LONG(flags)
Z_PARAM_LONG(start_offset)
ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
if (ZEND_SIZE_T_INT_OVFL(ZSTR_LEN(subject))) {
php_error_docref(NULL, E_WARNING, "Subject is too long");
RETURN_FALSE;
}
/* Compile regex or get it from cache. */
if ((pce = pcre_get_compiled_regex_cache(regex)) == NULL) {
RETURN_FALSE;
}
pce->refcount++;
php_pcre_match_impl(pce, ZSTR_VAL(subject), (int)ZSTR_LEN(subject), return_value, subpats,
global, ZEND_NUM_ARGS() >= 4, flags, start_offset);
pce->refcount--;
}
/* }}} */
/* {{{ 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, zend_long flags, zend_long start_offset)
{
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 no_utf_check = 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 */
char **subpat_names; /* Array for named subpatterns */
int i;
int subpats_order; /* Order of subpattern matches */
int offset_capture; /* Capture match offsets: yes/no */
int unmatched_as_null; /* Null non-matches: yes/no */
unsigned char *mark = NULL; /* Target for MARK name */
zval marks; /* Array of marks for PREG_PATTERN_ORDER */
ALLOCA_FLAG(use_heap);
ZVAL_UNDEF(&marks);
/* Overwrite the passed-in value for subpatterns with an empty array. */
if (subpats != NULL) {
zval_ptr_dtor(subpats);
array_init(subpats);
}
subpats_order = global ? PREG_PATTERN_ORDER : 0;
if (use_flags) {
offset_capture = flags & PREG_OFFSET_CAPTURE;
unmatched_as_null = flags & PREG_UNMATCHED_AS_NULL;
/*
* 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, E_WARNING, "Invalid flags specified");
return;
}
} else {
offset_capture = 0;
unmatched_as_null = 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 = (unsigned long)PCRE_G(backtrack_limit);
extra->match_limit_recursion = (unsigned long)PCRE_G(recursion_limit);
#ifdef PCRE_EXTRA_MARK
extra->mark = &mark;
extra->flags |= PCRE_EXTRA_MARK;
#endif
/* Calculate the size of the offsets array, and allocate memory for it. */
num_subpats = pce->capture_count + 1;
size_offsets = num_subpats * 3;
/*
* Build a mapping from subpattern numbers to their names. We will
* allocate the table only if there are any named subpatterns.
*/
subpat_names = NULL;
if (pce->name_count > 0) {
subpat_names = make_subpats_table(num_subpats, pce);
if (!subpat_names) {
RETURN_FALSE;
}
}
if (size_offsets <= 32) {
offsets = (int *)do_alloca(size_offsets * sizeof(int), use_heap);
} else {
offsets = (int *)safe_emalloc(size_offsets, sizeof(int), 0);
}
memset(offsets, 0, size_offsets*sizeof(int));
/* Allocate match sets array and initialize the values. */
if (global && subpats && subpats_order == PREG_PATTERN_ORDER) {
match_sets = (zval *)safe_emalloc(num_subpats, sizeof(zval), 0);
for (i=0; i<num_subpats; i++) {
array_init(&match_sets[i]);
}
}
matched = 0;
PCRE_G(error_code) = PHP_PCRE_NO_ERROR;
#ifdef HAVE_PCRE_JIT_SUPPORT
if (!(pce->compile_options & PCRE_UTF8)) {
no_utf_check = PCRE_NO_UTF8_CHECK;
}
#endif
do {
/* Execute the regular expression. */
#ifdef HAVE_PCRE_JIT_SUPPORT
if ((extra->flags & PCRE_EXTRA_EXECUTABLE_JIT)
&& no_utf_check && !g_notempty) {
count = pcre_jit_exec(pce->re, extra, subject, (int)subject_len, (int)start_offset,
no_utf_check|g_notempty, offsets, size_offsets, jit_stack);
} else
#endif
count = pcre_exec(pce->re, extra, subject, (int)subject_len, (int)start_offset,
no_utf_check|g_notempty, offsets, size_offsets);
/* the string was already proved to be valid UTF-8 */
no_utf_check = PCRE_NO_UTF8_CHECK;
/* Check for too many substrings condition. */
if (count == 0) {
php_error_docref(NULL, E_NOTICE, "Matched, but too many substrings");
count = size_offsets/3;
}
/* If something has matched */
if (count > 0) {
matched++;
/* 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 (offsets[1] - offsets[0] < 0) {
if (subpat_names) {
efree(subpat_names);
}
if (size_offsets <= 32) {
free_alloca(offsets, use_heap);
} else {
efree(offsets);
}
if (match_sets) efree(match_sets);
php_error_docref(NULL, E_WARNING, "Get subpatterns list failed");
RETURN_FALSE;
}
if (global) { /* global pattern matching */
if (subpats && subpats_order == PREG_PATTERN_ORDER) {
/* For each subpattern, insert it into the appropriate array. */
if (offset_capture) {
for (i = 0; i < count; i++) {
add_offset_pair(&match_sets[i], subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], NULL, unmatched_as_null);
}
} else {
for (i = 0; i < count; i++) {
if (offsets[i<<1] < 0) {
if (unmatched_as_null) {
add_next_index_null(&match_sets[i]);
} else {
add_next_index_str(&match_sets[i], ZSTR_EMPTY_ALLOC());
}
} else {
add_next_index_stringl(&match_sets[i], subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
}
/* Add MARK, if available */
if (mark) {
if (Z_TYPE(marks) == IS_UNDEF) {
array_init(&marks);
}
add_index_string(&marks, matched - 1, (char *) mark);
}
/*
* If the number of captured subpatterns on this run is
* less than the total possible number, pad the result
* arrays with NULLs or empty strings.
*/
if (count < num_subpats) {
for (; i < num_subpats; i++) {
if (unmatched_as_null) {
add_next_index_null(&match_sets[i]);
} else {
add_next_index_str(&match_sets[i], ZSTR_EMPTY_ALLOC());
}
}
}
} else {
/* Allocate the result set array */
array_init_size(&result_set, count + (mark ? 1 : 0));
/* Add all the subpatterns to it */
if (subpat_names) {
if (offset_capture) {
for (i = 0; i < count; i++) {
add_offset_pair(&result_set, subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], subpat_names[i], unmatched_as_null);
}
} else {
for (i = 0; i < count; i++) {
if (subpat_names[i]) {
if (offsets[i<<1] < 0) {
if (unmatched_as_null) {
add_assoc_null(&result_set, subpat_names[i]);
} else {
add_assoc_str(&result_set, subpat_names[i], ZSTR_EMPTY_ALLOC());
}
} else {
add_assoc_stringl(&result_set, subpat_names[i], subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
if (offsets[i<<1] < 0) {
if (unmatched_as_null) {
add_next_index_null(&result_set);
} else {
add_next_index_str(&result_set, ZSTR_EMPTY_ALLOC());
}
} else {
add_next_index_stringl(&result_set, subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
}
} else {
if (offset_capture) {
for (i = 0; i < count; i++) {
add_offset_pair(&result_set, subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], NULL, unmatched_as_null);
}
} else {
for (i = 0; i < count; i++) {
if (offsets[i<<1] < 0) {
if (unmatched_as_null) {
add_next_index_null(&result_set);
} else {
add_next_index_str(&result_set, ZSTR_EMPTY_ALLOC());
}
} else {
add_next_index_stringl(&result_set, subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
}
}
/* Add MARK, if available */
if (mark) {
add_assoc_string_ex(&result_set, "MARK", sizeof("MARK") - 1, (char *)mark);
}
/* And add it to the output array */
zend_hash_next_index_insert(Z_ARRVAL_P(subpats), &result_set);
}
} else { /* single pattern matching */
/* For each subpattern, insert it into the subpatterns array. */
if (subpat_names) {
if (offset_capture) {
for (i = 0; i < count; i++) {
add_offset_pair(subpats, subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1],
offsets[i<<1], subpat_names[i], unmatched_as_null);
}
} else {
for (i = 0; i < count; i++) {
if (subpat_names[i]) {
if (offsets[i<<1] < 0) {
if (unmatched_as_null) {
add_assoc_null(subpats, subpat_names[i]);
} else {
add_assoc_str(subpats, subpat_names[i], ZSTR_EMPTY_ALLOC());
}
} else {
add_assoc_stringl(subpats, subpat_names[i], subject + offsets[i<<1],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
if (offsets[i<<1] < 0) {
if (unmatched_as_null) {
add_next_index_null(subpats);
} else {