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php_pcre.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2016 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_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 PCRE_STUDY_JIT_COMPILE
#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 PCRE_STUDY_JIT_COMPILE
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);
if (pce->locale) {
zend_string_release(pce->locale);
}
#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 PCRE_STUDY_JIT_COMPILE
/* 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 PCRE_STUDY_JIT_COMPILE
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)
{
int jit_yes = 0;
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() );
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" );
}
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_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 PCRE_STUDY_JIT_COMPILE
/* {{{ 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;
/* 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), regex);
if (pce) {
#if HAVE_SETLOCALE
if (pce->locale == BG(locale_string) ||
(pce->locale && BG(locale_string) &&
ZSTR_LEN(pce->locale) == ZSTR_LEN(BG(locale_string)) &&
!memcmp(ZSTR_VAL(pce->locale), ZSTR_VAL(BG(locale_string)), ZSTR_LEN(pce->locale))) ||
(!pce->locale &&
ZSTR_LEN(BG(locale_string)) == 1 &&
ZSTR_VAL(BG(locale_string))[0] == 'C') ||
(!BG(locale_string) &&
ZSTR_LEN(pce->locale) == 1 &&
ZSTR_VAL(pce->locale)[0] == 'C')) {
return pce;
}
#else
return pce;
#endif
}
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) {
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 == '\\') {
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 (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);
return NULL;
}
}
#if HAVE_SETLOCALE
if (BG(locale_string) &&
(ZSTR_LEN(BG(locale_string)) != 1 || ZSTR_VAL(BG(locale_string))[0] != '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,E_WARNING, "Compilation failed: %s at offset %d", error, erroffset);
efree(pattern);
if (tables) {
pefree((void*)tables, 1);
}
return NULL;
}
#ifdef PCRE_STUDY_JIT_COMPILE
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 PCRE_STUDY_JIT_COMPILE
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 (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.locale = BG(locale_string) ?
((GC_FLAGS(BG(locale_string)) & IS_STR_PERSISTENT) ?
zend_string_copy(BG(locale_string)) :
zend_string_init(ZSTR_VAL(BG(locale_string)), ZSTR_LEN(BG(locale_string)), 1)) :
NULL;
new_entry.tables = tables;
#endif
new_entry.refcount = 0;
rc = pcre_fullinfo(re, extra, PCRE_INFO_CAPTURECOUNT, &new_entry.capture_count);
if (rc < 0) {
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) {
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(regex) || !(GC_FLAGS(regex) & IS_STR_PERMANENT)) {
zend_string *str = zend_string_init(ZSTR_VAL(regex), ZSTR_LEN(regex), 1);
GC_REFCOUNT(str) = 0; /* will be incremented by zend_hash_update_mem() */
ZSTR_H(str) = ZSTR_H(regex);
regex = str;
}
pce = zend_hash_update_mem(&PCRE_G(pcre_cache), regex, &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)
{
zval match_pair, tmp;
array_init_size(&match_pair, 2);
/* Add (match, offset) to the return value */
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_EX(subpats, 0, 1)
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 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 **subpat_names; /* Array for named subpatterns */
int i;
int subpats_order; /* Order of subpattern matches */
int offset_capture; /* Capture match offsets: 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_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, 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 = (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;
do {
/* Execute the regular expression. */
count = pcre_exec(pce->re, extra, subject, (int)subject_len, (int)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, 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) || pcre_get_substring_list(subject, offsets, count, &stringlist) < 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], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], NULL);
}
} else {
for (i = 0; i < count; i++) {
add_next_index_stringl(&match_sets[i], (char *)stringlist[i],
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 empty strings.
*/
if (count < num_subpats) {
for (; i < num_subpats; i++) {
add_next_index_string(&match_sets[i], "");
}
}
} 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, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], subpat_names[i]);
}
} else {
for (i = 0; i < count; i++) {
if (subpat_names[i]) {
add_assoc_stringl(&result_set, subpat_names[i], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1]);
}
add_next_index_stringl(&result_set, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
} else {
if (offset_capture) {
for (i = 0; i < count; i++) {
add_offset_pair(&result_set, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1], offsets[i<<1], NULL);
}
} else {
for (i = 0; i < count; i++) {
add_next_index_stringl(&result_set, (char *)stringlist[i],
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, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1],
offsets[i<<1], subpat_names[i]);
}
} else {
for (i = 0; i < count; i++) {
if (subpat_names[i]) {
add_assoc_stringl(subpats, subpat_names[i], (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1]);
}
add_next_index_stringl(subpats, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
} else {
if (offset_capture) {
for (i = 0; i < count; i++) {
add_offset_pair(subpats, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1],
offsets[i<<1], NULL);
}
} else {
for (i = 0; i < count; i++) {
add_next_index_stringl(subpats, (char *)stringlist[i],
offsets[(i<<1)+1] - offsets[i<<1]);
}
}
}
/* Add MARK, if available */
if (mark) {
add_assoc_string_ex(subpats, "MARK", sizeof("MARK") - 1, (char *)mark);
}
}
pcre_free((void *) stringlist);
}
} else if (count == PCRE_ERROR_NOMATCH) {
/* If we previously set PCRE_NOTEMPTY_ATSTART 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) {
int unit_len = calculate_unit_length(pce, subject + start_offset);
offsets[0] = (int)start_offset;
offsets[1] = (int)(start_offset + unit_len);
} else
break;
} else {
pcre_handle_exec_error(count);
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_ATSTART 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_ATSTART | 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 && subpats_order == PREG_PATTERN_ORDER) {
if (subpat_names) {
for (i = 0; i < num_subpats; i++) {
if (subpat_names[i]) {
zend_hash_str_update(Z_ARRVAL_P(subpats), subpat_names[i],
strlen(subpat_names[i]), &match_sets[i]);
Z_ADDREF(match_sets[i]);
}
zend_hash_next_index_insert(Z_ARRVAL_P(subpats), &match_sets[i]);
}
} else {
for (i = 0; i < num_subpats; i++) {
zend_hash_next_index_insert(Z_ARRVAL_P(subpats), &match_sets[i]);
}
}
efree(match_sets);
if (Z_TYPE(marks) != IS_UNDEF) {
add_assoc_zval(subpats, "MARK", &marks);
}
}
if (size_offsets <= 32) {
free_alloca(offsets, use_heap);
} else {
efree(offsets);
}
if (subpat_names) {
efree(subpat_names);
}
/* Did we encounter an error? */
if (PCRE_G(error_code) == PHP_PCRE_NO_ERROR) {
RETVAL_LONG(matched);
} else {
RETVAL_FALSE;
}
}
/* }}} */
/* {{{ 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
*/