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php_pcre.c
1403 lines (1196 loc) · 41.5 KB
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php_pcre.c
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/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2001 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.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. |
+----------------------------------------------------------------------+
| Authors: Andrei Zmievski <andrei@ispi.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "php_globals.h"
#include "php_pcre.h"
#include "ext/standard/info.h"
#if HAVE_PCRE || HAVE_BUNDLED_PCRE
#include "ext/standard/php_string.h"
#define PREG_PATTERN_ORDER 0
#define PREG_SET_ORDER 1
#define PREG_SPLIT_NO_EMPTY (1<<0)
#define PREG_SPLIT_DELIM_CAPTURE (1<<1)
#define PREG_REPLACE_EVAL (1<<0)
#ifdef ZTS
int pcre_globals_id;
#else
php_pcre_globals pcre_globals;
#endif
static void *php_pcre_malloc(size_t size)
{
return pemalloc(size, 1);
}
static void php_pcre_free(void *ptr)
{
pefree(ptr, 1);
}
static void php_free_pcre_cache(void *data)
{
pcre_cache_entry *pce = (pcre_cache_entry *) data;
pefree(pce->re, 1);
#if HAVE_SETLOCALE
pefree((void*)pce->tables, 1);
#endif
}
#ifdef ZTS
static void php_pcre_init_globals(php_pcre_globals *pcre_globals)
{
zend_hash_init(&PCRE_G(pcre_cache), 0, NULL, php_free_pcre_cache, 1);
}
static void php_pcre_shutdown_globals(php_pcre_globals *pcre_globals)
{
zend_hash_destroy(&PCRE_G(pcre_cache));
}
#endif
static /* {{{ PHP_MINFO_FUNCTION(pcre) */
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();
}
/* }}} */
/* {{{ PHP_MINIT_FUNCTION(pcre) */
static PHP_MINIT_FUNCTION(pcre)
{
#ifdef ZTS
pcre_globals_id = ts_allocate_id(
sizeof(php_pcre_globals),
(ts_allocate_ctor) php_pcre_init_globals,
(ts_allocate_dtor) php_pcre_shutdown_globals);
#else
zend_hash_init(&PCRE_G(pcre_cache), 0, NULL, php_free_pcre_cache, 1);
#endif
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_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);
return SUCCESS;
}
/* }}} */
/* {{{ PHP_MSHUTDOWN_FUNCTION(pcre) */
static PHP_MSHUTDOWN_FUNCTION(pcre)
{
#ifndef ZTS
zend_hash_destroy(&PCRE_G(pcre_cache));
#else
ts_free_id(pcre_globals_id);
#endif
return SUCCESS;
}
/* }}} */
/* {{{ PHP_RINIT_FUNCTION(pcre) */
static PHP_RINIT_FUNCTION(pcre)
{
pcre_malloc = php_pcre_malloc;
pcre_free = php_pcre_free;
return SUCCESS;
}
/* }}} */
static pcre* pcre_get_compiled_regex(char *regex, pcre_extra *extra, int *preg_options) {
pcre *re = NULL;
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 regex_len;
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;
PCRE_LS_FETCH();
/* Try to lookup the cached regex entry, and if successful, just pass
back the compiled pattern, otherwise go on and compile it. */
regex_len = strlen(regex);
if (zend_hash_find(&PCRE_G(pcre_cache), regex, regex_len+1, (void **)&pce) == SUCCESS) {
#if HAVE_SETLOCALE
if (!strcmp(pce->locale, locale)) {
#endif
extra = pce->extra;
*preg_options = pce->preg_options;
return pce->re;
#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)*p)) p++;
if (*p == 0) {
zend_error(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)delimiter) || delimiter == '\\') {
zend_error(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) {
zend_error(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) {
zend_error(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++;
/* Clear out preg options */
*preg_options = 0;
/* 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;
/* Custom preg options */
case 'e': poptions |= PREG_REPLACE_EVAL; break;
case ' ':
case '\n':
break;
default:
zend_error(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) {
zend_error(E_WARNING, "Compilation failed: %s at offset %d\n", error, erroffset);
efree(pattern);
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 (error != NULL) {
zend_error(E_WARNING, "Error while studying pattern");
}
}
*preg_options = poptions;
efree(pattern);
/* Store the compiled pattern and extra info in the cache. */
new_entry.re = re;
new_entry.extra = extra;
new_entry.preg_options = poptions;
#if HAVE_SETLOCALE
new_entry.locale = locale;
new_entry.tables = tables;
#endif
zend_hash_update(&PCRE_G(pcre_cache), regex, regex_len+1, (void *)&new_entry,
sizeof(pcre_cache_entry), NULL);
return re;
}
static void php_pcre_match(INTERNAL_FUNCTION_PARAMETERS, int global)
{
zval **regex, /* Regular expression */
**subject, /* String to match against */
**subpats = NULL, /* Array for subpatterns */
**subpats_order, /* Order of the results in the subpatterns
array for global match */
*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 *re = NULL; /* Compiled regular expression */
pcre_extra *extra = NULL; /* Holds results of studying */
int exoptions = 0; /* Execution options */
int preg_options = 0; /* Custom preg 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 start_offset; /* Where the new search starts */
int matched; /* Has anything matched */
int i;
int subpats_order_val = 0; /* Integer value of subpats_order */
int g_notempty = 0; /* If the match should not be empty */
const char **stringlist; /* Used to hold list of subpatterns */
char *match; /* The current match */
/* Get function parameters and do error-checking. */
switch(ZEND_NUM_ARGS()) {
case 2:
if (global || zend_get_parameters_ex(2, ®ex, &subject) == FAILURE) {
WRONG_PARAM_COUNT;
}
break;
case 3:
if (zend_get_parameters_ex(3, ®ex, &subject, &subpats) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (global)
subpats_order_val = PREG_PATTERN_ORDER;
if (!ParameterPassedByReference(ht, 3)) {
zend_error(E_WARNING, "Array to be filled with matches must be passed by reference.");
RETURN_FALSE;
}
break;
case 4:
if (zend_get_parameters_ex(4, ®ex, &subject, &subpats, &subpats_order) == FAILURE) {
WRONG_PARAM_COUNT;
}
if (!ParameterPassedByReference(ht, 3)) {
zend_error(E_WARNING, "Array to be filled with matches must be passed by reference.");
RETURN_FALSE;
}
/* Make sure subpats_order is a number */
convert_to_long_ex(subpats_order);
subpats_order_val = Z_LVAL_PP(subpats_order);
if (subpats_order_val < PREG_PATTERN_ORDER ||
subpats_order_val > PREG_SET_ORDER) {
zend_error(E_WARNING, "Wrong value for parameter 4 in call to preg_match_all()");
}
break;
default:
WRONG_PARAM_COUNT;
}
/* Make sure we're dealing with strings. */
convert_to_string_ex(regex);
convert_to_string_ex(subject);
/* Make sure to clean up the passed array and initialize it. */
if (subpats != NULL) {
zval_dtor(*subpats);
array_init(*subpats);
}
/* Compile regex or get it from cache. */
if ((re = pcre_get_compiled_regex(Z_STRVAL_PP(regex), extra, &preg_options)) == NULL) {
RETURN_FALSE;
}
/* Calculate the size of the offsets array, and allocate memory for it. */
num_subpats = pcre_info(re, NULL, NULL) + 1;
size_offsets = num_subpats * 3;
offsets = (int *)emalloc(size_offsets * sizeof(int));
/* Allocate match sets array and initialize the values */
if (global && subpats_order_val == PREG_PATTERN_ORDER) {
match_sets = (zval **)emalloc(num_subpats * sizeof(zval *));
for (i=0; i<num_subpats; i++) {
ALLOC_ZVAL(match_sets[i]);
array_init(match_sets[i]);
INIT_PZVAL(match_sets[i]);
}
}
/* Start from the beginning of the string */
start_offset = 0;
match = NULL;
matched = 0;
do {
/* Execute the regular expression. */
count = pcre_exec(re, extra, Z_STRVAL_PP(subject),
Z_STRLEN_PP(subject), start_offset,
exoptions|g_notempty, offsets, size_offsets);
/* Check for too many substrings condition. */
if (count == 0) {
zend_error(E_NOTICE, "Matched, but too many substrings\n");
count = size_offsets/3;
}
/* If something has matched */
if (count >= 0) {
matched++;
match = Z_STRVAL_PP(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(Z_STRVAL_PP(subject),
offsets, count, &stringlist) < 0) {
efree(offsets);
efree(re);
zend_error(E_WARNING, "Get subpatterns list failed");
return;
}
if (global) { /* global pattern matching */
if (subpats_order_val == PREG_PATTERN_ORDER) {
/* For each subpattern, insert it into the appropriate array */
for (i=0; i<count; i++) {
add_next_index_string(match_sets[i], (char *)stringlist[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++) {
add_next_index_string(result_set, (char *)stringlist[i], 1);
}
/* And add it to the output array */
zend_hash_next_index_insert(Z_ARRVAL_PP(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++) {
add_next_index_string((*subpats), (char *)stringlist[i], 1);
}
}
php_pcre_free((void *) stringlist);
}
}
else { /* Failed to match */
/* 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 < Z_STRLEN_PP(subject)) {
offsets[0] = start_offset;
offsets[1] = start_offset + 1;
} else
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_val == PREG_PATTERN_ORDER) {
for (i=0; i<num_subpats; i++) {
zend_hash_next_index_insert(Z_ARRVAL_PP(subpats), &match_sets[i], sizeof(zval *), NULL);
}
efree(match_sets);
}
efree(offsets);
RETVAL_LONG(matched);
}
/* {{{ proto int preg_match(string pattern, string subject [, array subpatterns])
Perform a Perl-style regular expression match */
PHP_FUNCTION(preg_match)
{
php_pcre_match(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto int preg_match_all(string pattern, string subject, array subpatterns [, int order])
Perform a Perl-style global regular expression match */
PHP_FUNCTION(preg_match_all)
{
php_pcre_match(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
static inline int preg_get_backref(const char *walk, int *backref)
{
if (*walk && *walk >= '0' && *walk <= '9')
*backref = *walk - '0';
else
return 0;
if (walk[1] && walk[1] >= '0' && walk[1] <= '9')
*backref = *backref * 10 + walk[1] - '0';
return 1;
}
static int preg_do_repl_func(zval *function, char *subject, int *offsets, int count, char **result)
{
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;
ELS_FETCH();
MAKE_STD_ZVAL(subpats);
array_init(subpats);
for (i = 0; i < count; i++)
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) == 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 {
php_error(E_WARNING, "Unable to call custom replacement function");
result_len = offsets[1] - offsets[0];
*result = estrndup(&subject[offsets[0]], result_len);
}
zval_dtor(subpats);
FREE_ZVAL(subpats);
return result_len;
}
static int preg_do_eval(char *eval_str, int eval_str_len, char *subject,
int *offsets, int count, char **result)
{
zval retval; /* Return value from evaluation */
char backref_buf[4], /* Buffer for string version of backref */
*code, /* PHP code string */
*new_code, /* Code as result of substitution */
*match, /* Current match for a backref */
*esc_match, /* Quote-escaped match */
*walk, /* Used to walk the code string */
walk_last; /* Last walked character */
int code_len; /* Length of the code string */
int new_code_len; /* Length of the substituted code string */
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;
CLS_FETCH();
ELS_FETCH();
/* Save string to be evaluated, since we will be modifying it */
code = estrndup(eval_str, eval_str_len);
walk = code;
new_code_len = code_len = eval_str_len;
walk_last = 0;
while (*walk) {
/* If found a backreference.. */
if ('\\' == *walk || '$' == *walk) {
if (walk_last == '\\') {
memmove(walk-1, walk, code_len - (walk - code) + 1);
walk_last = 0;
continue;
}
if (preg_get_backref(walk+1, &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(match, match_len, &esc_match_len, 0);
else {
esc_match = match;
esc_match_len = 0;
}
} else {
esc_match = empty_string;
esc_match_len = 0;
match_len = 0;
}
sprintf(backref_buf, "%c%d", *walk, backref);
new_code = php_str_to_str(code, code_len,
backref_buf, (backref > 9) ? 3 : 2,
esc_match, esc_match_len, &new_code_len);
/* Adjust the walk pointer */
walk = new_code + (walk - code) + match_len;
/* Clean up and reassign */
if (esc_match_len)
efree(esc_match);
efree(code);
code = new_code;
code_len = new_code_len;
continue;
}
}
walk++;
walk_last = walk[-1];
}
compiled_string_description = zend_make_compiled_string_description("regexp code");
/* Run the code */
if (zend_eval_string(code, &retval, compiled_string_description CLS_CC ELS_CC) == FAILURE) {
efree(compiled_string_description);
zend_error(E_ERROR, "Failed evaluating code:\n%s\n", code);
/* 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);
efree(code);
return result_len;
}
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)
{
pcre *re = NULL; /* Compiled regular expression */
pcre_extra *extra = NULL; /* Holds results of studying */
int exoptions = 0; /* Execution options */
int preg_options = 0; /* Custom preg options */
int count = 0; /* Count of matched subpatterns */
int *offsets; /* Array of subpattern offsets */
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; /* Length of replacement string */
char *result, /* Result of replacement */
*replace, /* 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, /* End of replacement string */
*eval_result, /* Result of eval or custom function */
walk_last; /* Last walked character */
/* Compile regex or get it from cache. */
if ((re = pcre_get_compiled_regex(regex, extra, &preg_options)) == NULL) {
return NULL;
}
eval = preg_options & PREG_REPLACE_EVAL;
if (is_callable_replace) {
if (eval) {
php_error(E_WARNING, "/e modifier cannot be used with replacement callback");
return NULL;
}
} else {
convert_to_string(replace_val);
replace = Z_STRVAL_P(replace_val);
replace_len = Z_STRLEN_P(replace_val);
replace_end = replace + replace_len;
}
/* Calculate the size of the offsets array, and allocate memory for it. */
size_offsets = (pcre_info(re, NULL, NULL) + 1) * 3;
offsets = (int *)emalloc(size_offsets * sizeof(int));
alloc_len = 2 * subject_len + 1;
result = emalloc(alloc_len * sizeof(char));
/* Initialize */
match = NULL;
*result_len = 0;
start_offset = 0;
while (1) {
/* Execute the regular expression. */
count = pcre_exec(re, extra, subject, subject_len, start_offset,
exoptions|g_notempty, offsets, size_offsets);
/* Check for too many substrings condition. */
if (count == 0) {
zend_error(E_NOTICE, "Matched, but too many substrings\n");
count = size_offsets/3;
}
piece = subject + start_offset;
if (count > 0 && (limit == -1 || limit > 0)) {
/* Set the match location in subject */
match = subject + offsets[0];
new_len = *result_len + offsets[0] - start_offset; /* part before the match */
/* If evaluating, do it and add the return string's length */
if (eval) {
eval_result_len = preg_do_eval(replace, replace_len, subject,
offsets, count, &eval_result);
new_len += eval_result_len;
} else if (is_callable_replace) {
/* Use custom function to get replacement string and its length. */
eval_result_len = preg_do_repl_func(replace_val, subject, offsets,
count, &eval_result);
new_len += eval_result_len;
} else { /* do regular substitution */
walk = replace;
walk_last = 0;
while (walk < replace_end) {
if ('\\' == *walk || '$' == *walk) {
if (walk_last == '\\') {
walk++;
walk_last = 0;
continue;
}
if (preg_get_backref(walk+1, &backref)) {
if (backref < count)
new_len += offsets[(backref<<1)+1] - offsets[backref<<1];
walk += (backref > 9) ? 3 : 2;
continue;
}
}
new_len++;
walk++;
walk_last = walk[-1];
}
}
if (new_len + 1 > alloc_len) {
alloc_len = 1 + alloc_len + 2 * new_len;
new_buf = emalloc(alloc_len);
memcpy(new_buf, result, *result_len);
efree(result);
result = new_buf;
}
/* copy the part of the string before the match */
memcpy(&result[*result_len], piece, match-piece);
*result_len += match-piece;
/* copy replacement and backrefs */
walkbuf = result + *result_len;
/* If evaluating or using custom function, copy result to the buffer
* and clean up. */
if (eval || is_callable_replace) {
memcpy(walkbuf, eval_result, eval_result_len);
*result_len += eval_result_len;
STR_FREE(eval_result);
} else { /* do regular backreference copying */
walk = replace;
walk_last = 0;
while (walk < replace_end) {
if ('\\' == *walk || '$' == *walk) {
if (walk_last == '\\') {
*(walkbuf-1) = *walk++;
walk_last = 0;
continue;
}
if (preg_get_backref(walk+1, &backref)) {
if (backref < count) {
match_len = offsets[(backref<<1)+1] - offsets[backref<<1];
memcpy(walkbuf, subject + offsets[backref<<1], match_len);
walkbuf += match_len;
}
walk += (backref > 9) ? 3 : 2;
continue;
}
}
*walkbuf++ = *walk++;
walk_last = walk[-1];
}
*walkbuf = '\0';
/* increment the result length by how much we've added to the string */
*result_len += walkbuf - (result + *result_len);
}
if (limit != -1)
limit--;
} else { /* Failed to match */
/* 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;
memcpy(&result[*result_len], piece, 1);
(*result_len)++;
} else {
new_len = *result_len + subject_len - start_offset;
if (new_len + 1 > alloc_len) {
alloc_len = new_len + 1; /* now we know exactly how long it is */
new_buf = emalloc(alloc_len * sizeof(char));
memcpy(new_buf, result, *result_len);
efree(result);
result = new_buf;
}
/* stick that last bit of string on our output */
memcpy(&result[*result_len], piece, subject_len - start_offset);
*result_len += subject_len - start_offset;
result[*result_len] = '\0';
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 next piece. */
start_offset = offsets[1];
}
efree(offsets);
return result;
}
static char *php_replace_in_subject(zval *regex, zval *replace, zval **subject, int *result_len, int limit, zend_bool is_callable_replace)
{
zval **regex_entry,
**replace_entry = NULL,
*replace_value,
empty_replace;
char *subject_value,
*result;
int subject_len;
/* Make sure we're dealing with strings. */
convert_to_string_ex(subject);
ZVAL_STRINGL(&empty_replace, empty_string, 0, 0);
/* If regex is an array */
if (Z_TYPE_P(regex) == IS_ARRAY) {
/* Duplicate subject string for repeated replacement */
subject_value = estrndup(Z_STRVAL_PP(subject), Z_STRLEN_PP(subject));
subject_len = Z_STRLEN_PP(subject);
*result_len = subject_len;
zend_hash_internal_pointer_reset(Z_ARRVAL_P(regex));
replace_value = replace;
if (Z_TYPE_P(replace) == IS_ARRAY && !is_callable_replace)
zend_hash_internal_pointer_reset(Z_ARRVAL_P(replace));
/* For each entry in the regex array, get the entry */
while (zend_hash_get_current_data(Z_ARRVAL_P(regex), (void **)®ex_entry) == SUCCESS) {
/* Make sure we're dealing with strings. */
convert_to_string_ex(regex_entry);
/* If replace is an array and not a callable construct */
if (Z_TYPE_P(replace) == IS_ARRAY && !is_callable_replace) {
/* Get current entry */
if (zend_hash_get_current_data(Z_ARRVAL_P(replace), (void **)&replace_entry) == SUCCESS) {
replace_value = *replace_entry;
zend_hash_move_forward(Z_ARRVAL_P(replace));
} else {
/* We've run out of replacement strings, so use an empty one */
replace_value = &empty_replace;
}
}
/* Do the actual replacement and put the result back into subject_value
for further replacements. */
if ((result = php_pcre_replace(Z_STRVAL_PP(regex_entry),
Z_STRLEN_PP(regex_entry),
subject_value,
subject_len,
replace_value,
is_callable_replace,
result_len,
limit)) != NULL) {
efree(subject_value);
subject_value = result;
subject_len = *result_len;
}
zend_hash_move_forward(Z_ARRVAL_P(regex));
}
return subject_value;
} else {
result = php_pcre_replace(Z_STRVAL_P(regex),
Z_STRLEN_P(regex),
Z_STRVAL_PP(subject),
Z_STRLEN_PP(subject),
replace,
is_callable_replace,
result_len,
limit);
return result;
}
}
static void preg_replace_impl(INTERNAL_FUNCTION_PARAMETERS, int is_callable_replace)
{
zval **regex,
**replace,
**subject,
**limit,
**subject_entry;
char *result;
int result_len;
int limit_val = -1;
char *string_key;
ulong num_key;
char *callback_name;
/* Get function parameters and do error-checking. */
if (ZEND_NUM_ARGS() < 3 || ZEND_NUM_ARGS() > 4 ||
zend_get_parameters_ex(ZEND_NUM_ARGS(), ®ex, &replace, &subject, &limit) == FAILURE) {
WRONG_PARAM_COUNT;
}
SEPARATE_ZVAL(replace);
if (Z_TYPE_PP(replace) != IS_ARRAY)
convert_to_string_ex(replace);
if (is_callable_replace && !zend_is_callable(*replace, 0, &callback_name)) {
php_error(E_WARNING, "%s() requires argument 2, '%s', to be a valid callback",
get_active_function_name(), callback_name);
efree(callback_name);
*return_value = **subject;
zval_copy_ctor(return_value);
return;
}
SEPARATE_ZVAL(regex);
SEPARATE_ZVAL(subject);
if (ZEND_NUM_ARGS() > 3) {
convert_to_long_ex(limit);