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php-src/ext/ereg/ereg.c
Felipe Pena 8775a37559 - Year++
2012-01-01 13:15:04 +00:00

770 lines
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2012 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. |
+----------------------------------------------------------------------+
| Authors: Rasmus Lerdorf <rasmus@php.net> |
| Jim Winstead <jimw@php.net> |
| Jaakko Hyvätti <jaakko@hyvatti.iki.fi> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include <stdio.h>
#include <ctype.h>
#include "php.h"
#include "ext/standard/php_string.h"
#include "php_ereg.h"
#include "ext/standard/info.h"
/* {{{ arginfo */
ZEND_BEGIN_ARG_INFO_EX(arginfo_ereg, 0, 0, 2)
ZEND_ARG_INFO(0, pattern)
ZEND_ARG_INFO(0, string)
ZEND_ARG_INFO(1, registers) /* ARRAY_INFO(1, registers, 1) */
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_ereg_replace, 0)
ZEND_ARG_INFO(0, pattern)
ZEND_ARG_INFO(0, replacement)
ZEND_ARG_INFO(0, string)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO_EX(arginfo_split, 0, 0, 2)
ZEND_ARG_INFO(0, pattern)
ZEND_ARG_INFO(0, string)
ZEND_ARG_INFO(0, limit)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_INFO(arginfo_sql_regcase, 0)
ZEND_ARG_INFO(0, string)
ZEND_END_ARG_INFO()
/* }}} */
/* {{{ Function table */
const zend_function_entry ereg_functions[] = {
PHP_DEP_FE(ereg, arginfo_ereg)
PHP_DEP_FE(ereg_replace, arginfo_ereg_replace)
PHP_DEP_FE(eregi, arginfo_ereg)
PHP_DEP_FE(eregi_replace, arginfo_ereg_replace)
PHP_DEP_FE(split, arginfo_split)
PHP_DEP_FE(spliti, arginfo_split)
PHP_DEP_FE(sql_regcase, arginfo_sql_regcase)
PHP_FE_END
};
/* }}} */
/* {{{ reg_cache */
typedef struct {
regex_t preg;
int cflags;
unsigned long lastuse;
} reg_cache;
static int reg_magic = 0;
#define EREG_CACHE_SIZE 4096
/* }}} */
ZEND_DECLARE_MODULE_GLOBALS(ereg)
static PHP_GINIT_FUNCTION(ereg);
static PHP_GSHUTDOWN_FUNCTION(ereg);
/* {{{ Module entry */
zend_module_entry ereg_module_entry = {
STANDARD_MODULE_HEADER,
"ereg",
ereg_functions,
NULL,
NULL,
NULL,
NULL,
PHP_MINFO(ereg),
NO_VERSION_YET,
PHP_MODULE_GLOBALS(ereg),
PHP_GINIT(ereg),
PHP_GSHUTDOWN(ereg),
NULL,
STANDARD_MODULE_PROPERTIES_EX
};
/* }}} */
/* {{{ COMPILE_DL_EREG */
#ifdef COMPILE_DL_EREG
ZEND_GET_MODULE(ereg)
#endif
/* }}} */
/* {{{ ereg_lru_cmp */
static int ereg_lru_cmp(const void *a, const void *b TSRMLS_DC)
{
Bucket *f = *((Bucket **) a);
Bucket *s = *((Bucket **) b);
if (((reg_cache *)f->pData)->lastuse <
((reg_cache *)s->pData)->lastuse) {
return -1;
} else if (((reg_cache *)f->pData)->lastuse ==
((reg_cache *)s->pData)->lastuse) {
return 0;
} else {
return 1;
}
}
/* }}} */
/* {{{ static ereg_clean_cache */
static int ereg_clean_cache(void *data, void *arg TSRMLS_DC)
{
int *num_clean = (int *)arg;
if (*num_clean > 0) {
(*num_clean)--;
return ZEND_HASH_APPLY_REMOVE;
} else {
return ZEND_HASH_APPLY_STOP;
}
}
/* }}} */
/* {{{ _php_regcomp
*/
static int _php_regcomp(regex_t *preg, const char *pattern, int cflags TSRMLS_DC)
{
int r = 0;
int patlen = strlen(pattern);
reg_cache *rc = NULL;
if (zend_hash_num_elements(&EREG(ht_rc)) >= EREG_CACHE_SIZE) {
/* easier than dealing with overflow as it happens */
if (EREG(lru_counter) >= (1 << 31) || zend_hash_sort(&EREG(ht_rc), zend_qsort, ereg_lru_cmp, 0 TSRMLS_CC) == FAILURE) {
zend_hash_clean(&EREG(ht_rc));
EREG(lru_counter) = 0;
} else {
int num_clean = EREG_CACHE_SIZE / 4;
zend_hash_apply_with_argument(&EREG(ht_rc), ereg_clean_cache, &num_clean TSRMLS_CC);
}
}
if(zend_hash_find(&EREG(ht_rc), (char *) pattern, patlen+1, (void **) &rc) == SUCCESS
&& rc->cflags == cflags) {
#ifdef HAVE_REGEX_T_RE_MAGIC
/*
* We use a saved magic number to see whether cache is corrupted, and if it
* is, we flush it and compile the pattern from scratch.
*/
if (rc->preg.re_magic != reg_magic) {
zend_hash_clean(&EREG(ht_rc));
EREG(lru_counter) = 0;
} else {
memcpy(preg, &rc->preg, sizeof(*preg));
return r;
}
}
r = regcomp(preg, pattern, cflags);
if(!r) {
reg_cache rcp;
rcp.cflags = cflags;
rcp.lastuse = ++(EREG(lru_counter));
memcpy(&rcp.preg, preg, sizeof(*preg));
/*
* Since we don't have access to the actual MAGIC1 definition in the private
* header file, we save the magic value immediately after compilation. Hopefully,
* it's good.
*/
if (!reg_magic) reg_magic = preg->re_magic;
zend_hash_update(&EREG(ht_rc), (char *) pattern, patlen+1,
(void *) &rcp, sizeof(rcp), NULL);
}
#else
memcpy(preg, &rc->preg, sizeof(*preg));
} else {
r = regcomp(preg, pattern, cflags);
if(!r) {
reg_cache rcp;
rcp.cflags = cflags;
rcp.lastuse = ++(EREG(lru_counter));
memcpy(&rcp.preg, preg, sizeof(*preg));
zend_hash_update(&EREG(ht_rc), (char *) pattern, patlen+1,
(void *) &rcp, sizeof(rcp), NULL);
}
}
#endif
return r;
}
/* }}} */
static void _free_ereg_cache(reg_cache *rc)
{
regfree(&rc->preg);
}
#undef regfree
#define regfree(a);
#undef regcomp
#define regcomp(a, b, c) _php_regcomp(a, b, c TSRMLS_CC)
/* {{{ PHP_GINIT_FUNCTION
*/
static PHP_GINIT_FUNCTION(ereg)
{
zend_hash_init(&ereg_globals->ht_rc, 0, NULL, (void (*)(void *)) _free_ereg_cache, 1);
ereg_globals->lru_counter = 0;
}
/* }}} */
/* {{{ PHP_GSHUTDOWN_FUNCTION
*/
static PHP_GSHUTDOWN_FUNCTION(ereg)
{
zend_hash_destroy(&ereg_globals->ht_rc);
}
/* }}} */
PHP_MINFO_FUNCTION(ereg)
{
php_info_print_table_start();
#if HSREGEX
php_info_print_table_row(2, "Regex Library", "Bundled library enabled");
#else
php_info_print_table_row(2, "Regex Library", "System library enabled");
#endif
php_info_print_table_end();
}
/* {{{ php_ereg_eprint
* php_ereg_eprint - convert error number to name
*/
static void php_ereg_eprint(int err, regex_t *re TSRMLS_DC) {
char *buf = NULL, *message = NULL;
size_t len;
size_t buf_len;
#ifdef REG_ITOA
/* get the length of the message */
buf_len = regerror(REG_ITOA | err, re, NULL, 0);
if (buf_len) {
buf = (char *)safe_emalloc(buf_len, sizeof(char), 0);
if (!buf) return; /* fail silently */
/* finally, get the error message */
regerror(REG_ITOA | err, re, buf, buf_len);
}
#else
buf_len = 0;
#endif
len = regerror(err, re, NULL, 0);
if (len) {
message = (char *)safe_emalloc((buf_len + len + 2), sizeof(char), 0);
if (!message) {
return; /* fail silently */
}
if (buf_len) {
snprintf(message, buf_len, "%s: ", buf);
buf_len += 1; /* so pointer math below works */
}
/* drop the message into place */
regerror(err, re, message + buf_len, len);
php_error_docref(NULL TSRMLS_CC, E_WARNING, "%s", message);
}
STR_FREE(buf);
STR_FREE(message);
}
/* }}} */
/* {{{ php_ereg
*/
static void php_ereg(INTERNAL_FUNCTION_PARAMETERS, int icase)
{
zval **regex, /* Regular expression */
**array = NULL; /* Optional register array */
char *findin; /* String to apply expression to */
int findin_len;
regex_t re;
regmatch_t *subs;
int err, match_len, string_len;
uint i;
int copts = 0;
off_t start, end;
char *buf = NULL;
char *string = NULL;
int argc = ZEND_NUM_ARGS();
if (zend_parse_parameters(argc TSRMLS_CC, "Zs|Z", &regex, &findin, &findin_len, &array) == FAILURE) {
return;
}
if (icase) {
copts |= REG_ICASE;
}
if (argc == 2) {
copts |= REG_NOSUB;
}
/* compile the regular expression from the supplied regex */
if (Z_TYPE_PP(regex) == IS_STRING) {
err = regcomp(&re, Z_STRVAL_PP(regex), REG_EXTENDED | copts);
} else {
/* we convert numbers to integers and treat them as a string */
if (Z_TYPE_PP(regex) == IS_DOUBLE) {
convert_to_long_ex(regex); /* get rid of decimal places */
}
convert_to_string_ex(regex);
/* don't bother doing an extended regex with just a number */
err = regcomp(&re, Z_STRVAL_PP(regex), copts);
}
if (err) {
php_ereg_eprint(err, &re TSRMLS_CC);
RETURN_FALSE;
}
/* make a copy of the string we're looking in */
string = estrndup(findin, findin_len);
/* allocate storage for (sub-)expression-matches */
subs = (regmatch_t *)ecalloc(sizeof(regmatch_t),re.re_nsub+1);
/* actually execute the regular expression */
err = regexec(&re, string, re.re_nsub+1, subs, 0);
if (err && err != REG_NOMATCH) {
php_ereg_eprint(err, &re TSRMLS_CC);
regfree(&re);
efree(subs);
RETURN_FALSE;
}
match_len = 1;
if (array && err != REG_NOMATCH) {
match_len = (int) (subs[0].rm_eo - subs[0].rm_so);
string_len = findin_len + 1;
buf = emalloc(string_len);
zval_dtor(*array); /* start with clean array */
array_init(*array);
for (i = 0; i <= re.re_nsub; i++) {
start = subs[i].rm_so;
end = subs[i].rm_eo;
if (start != -1 && end > 0 && start < string_len && end < string_len && start < end) {
add_index_stringl(*array, i, string+start, end-start, 1);
} else {
add_index_bool(*array, i, 0);
}
}
efree(buf);
}
efree(subs);
efree(string);
if (err == REG_NOMATCH) {
RETVAL_FALSE;
} else {
if (match_len == 0)
match_len = 1;
RETVAL_LONG(match_len);
}
regfree(&re);
}
/* }}} */
/* {{{ proto int ereg(string pattern, string string [, array registers])
Regular expression match */
PHP_FUNCTION(ereg)
{
php_ereg(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto int eregi(string pattern, string string [, array registers])
Case-insensitive regular expression match */
PHP_FUNCTION(eregi)
{
php_ereg(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
/* {{{ php_ereg_replace
* this is the meat and potatoes of regex replacement! */
PHP_EREG_API char *php_ereg_replace(const char *pattern, const char *replace, const char *string, int icase, int extended TSRMLS_DC)
{
regex_t re;
regmatch_t *subs;
char *buf, /* buf is where we build the replaced string */
*nbuf, /* nbuf is used when we grow the buffer */
*walkbuf; /* used to walk buf when replacing backrefs */
const char *walk; /* used to walk replacement string for backrefs */
int buf_len;
int pos, tmp, string_len, new_l;
int err, copts = 0;
string_len = strlen(string);
if (icase) {
copts = REG_ICASE;
}
if (extended) {
copts |= REG_EXTENDED;
}
err = regcomp(&re, pattern, copts);
if (err) {
php_ereg_eprint(err, &re TSRMLS_CC);
return ((char *) -1);
}
/* allocate storage for (sub-)expression-matches */
subs = (regmatch_t *)ecalloc(sizeof(regmatch_t),re.re_nsub+1);
/* start with a buffer that is twice the size of the stringo
we're doing replacements in */
buf_len = 2 * string_len + 1;
buf = safe_emalloc(buf_len, sizeof(char), 0);
err = pos = 0;
buf[0] = '\0';
while (!err) {
err = regexec(&re, &string[pos], re.re_nsub+1, subs, (pos ? REG_NOTBOL : 0));
if (err && err != REG_NOMATCH) {
php_ereg_eprint(err, &re TSRMLS_CC);
efree(subs);
efree(buf);
regfree(&re);
return ((char *) -1);
}
if (!err) {
/* backref replacement is done in two passes:
1) find out how long the string will be, and allocate buf
2) copy the part before match, replacement and backrefs to buf
Jaakko Hyvätti <Jaakko.Hyvatti@iki.fi>
*/
new_l = strlen(buf) + subs[0].rm_so; /* part before the match */
walk = replace;
while (*walk) {
if ('\\' == *walk && isdigit((unsigned char)walk[1]) && ((unsigned char)walk[1]) - '0' <= (int)re.re_nsub) {
if (subs[walk[1] - '0'].rm_so > -1 && subs[walk[1] - '0'].rm_eo > -1) {
new_l += subs[walk[1] - '0'].rm_eo - subs[walk[1] - '0'].rm_so;
}
walk += 2;
} else {
new_l++;
walk++;
}
}
if (new_l + 1 > buf_len) {
buf_len = 1 + buf_len + 2 * new_l;
nbuf = emalloc(buf_len);
strncpy(nbuf, buf, buf_len - 1);
nbuf[buf_len - 1] = '\0';
efree(buf);
buf = nbuf;
}
tmp = strlen(buf);
/* copy the part of the string before the match */
strncat(buf, &string[pos], subs[0].rm_so);
/* copy replacement and backrefs */
walkbuf = &buf[tmp + subs[0].rm_so];
walk = replace;
while (*walk) {
if ('\\' == *walk && isdigit((unsigned char)walk[1]) && (unsigned char)walk[1] - '0' <= (int)re.re_nsub) {
if (subs[walk[1] - '0'].rm_so > -1 && subs[walk[1] - '0'].rm_eo > -1
/* this next case shouldn't happen. it does. */
&& subs[walk[1] - '0'].rm_so <= subs[walk[1] - '0'].rm_eo) {
tmp = subs[walk[1] - '0'].rm_eo - subs[walk[1] - '0'].rm_so;
memcpy (walkbuf, &string[pos + subs[walk[1] - '0'].rm_so], tmp);
walkbuf += tmp;
}
walk += 2;
} else {
*walkbuf++ = *walk++;
}
}
*walkbuf = '\0';
/* and get ready to keep looking for replacements */
if (subs[0].rm_so == subs[0].rm_eo) {
if (subs[0].rm_so + pos >= string_len) {
break;
}
new_l = strlen (buf) + 1;
if (new_l + 1 > buf_len) {
buf_len = 1 + buf_len + 2 * new_l;
nbuf = safe_emalloc(buf_len, sizeof(char), 0);
strncpy(nbuf, buf, buf_len-1);
efree(buf);
buf = nbuf;
}
pos += subs[0].rm_eo + 1;
buf [new_l-1] = string [pos-1];
buf [new_l] = '\0';
} else {
pos += subs[0].rm_eo;
}
} else { /* REG_NOMATCH */
new_l = strlen(buf) + strlen(&string[pos]);
if (new_l + 1 > buf_len) {
buf_len = new_l + 1; /* now we know exactly how long it is */
nbuf = safe_emalloc(buf_len, sizeof(char), 0);
strncpy(nbuf, buf, buf_len-1);
efree(buf);
buf = nbuf;
}
/* stick that last bit of string on our output */
strlcat(buf, &string[pos], buf_len);
}
}
/* don't want to leak memory .. */
efree(subs);
regfree(&re);
/* whew. */
return (buf);
}
/* }}} */
/* {{{ php_do_ereg_replace
*/
static void php_do_ereg_replace(INTERNAL_FUNCTION_PARAMETERS, int icase)
{
zval **arg_pattern,
**arg_replace;
char *pattern, *arg_string;
char *string;
char *replace;
char *ret;
int arg_string_len;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ZZs", &arg_pattern, &arg_replace, &arg_string, &arg_string_len) == FAILURE) {
return;
}
if (Z_TYPE_PP(arg_pattern) == IS_STRING) {
if (Z_STRVAL_PP(arg_pattern) && Z_STRLEN_PP(arg_pattern)) {
pattern = estrndup(Z_STRVAL_PP(arg_pattern), Z_STRLEN_PP(arg_pattern));
} else {
pattern = STR_EMPTY_ALLOC();
}
} else {
convert_to_long_ex(arg_pattern);
pattern = emalloc(2);
pattern[0] = (char) Z_LVAL_PP(arg_pattern);
pattern[1] = '\0';
}
if (Z_TYPE_PP(arg_replace) == IS_STRING) {
if (Z_STRVAL_PP(arg_replace) && Z_STRLEN_PP(arg_replace)) {
replace = estrndup(Z_STRVAL_PP(arg_replace), Z_STRLEN_PP(arg_replace));
} else {
replace = STR_EMPTY_ALLOC();
}
} else {
convert_to_long_ex(arg_replace);
replace = emalloc(2);
replace[0] = (char) Z_LVAL_PP(arg_replace);
replace[1] = '\0';
}
if (arg_string && arg_string_len) {
string = estrndup(arg_string, arg_string_len);
} else {
string = STR_EMPTY_ALLOC();
}
/* do the actual work */
ret = php_ereg_replace(pattern, replace, string, icase, 1 TSRMLS_CC);
if (ret == (char *) -1) {
RETVAL_FALSE;
} else {
RETVAL_STRING(ret, 1);
STR_FREE(ret);
}
STR_FREE(string);
STR_FREE(replace);
STR_FREE(pattern);
}
/* }}} */
/* {{{ proto string ereg_replace(string pattern, string replacement, string string)
Replace regular expression */
PHP_FUNCTION(ereg_replace)
{
php_do_ereg_replace(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto string eregi_replace(string pattern, string replacement, string string)
Case insensitive replace regular expression */
PHP_FUNCTION(eregi_replace)
{
php_do_ereg_replace(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
/* {{{ php_split
*/
static void php_split(INTERNAL_FUNCTION_PARAMETERS, int icase)
{
long count = -1;
regex_t re;
regmatch_t subs[1];
char *spliton, *str, *strp, *endp;
int spliton_len, str_len;
int err, size, copts = 0;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ss|l", &spliton, &spliton_len, &str, &str_len, &count) == FAILURE) {
return;
}
if (icase) {
copts = REG_ICASE;
}
strp = str;
endp = strp + str_len;
err = regcomp(&re, spliton, REG_EXTENDED | copts);
if (err) {
php_ereg_eprint(err, &re TSRMLS_CC);
RETURN_FALSE;
}
array_init(return_value);
/* churn through str, generating array entries as we go */
while ((count == -1 || count > 1) && !(err = regexec(&re, strp, 1, subs, 0))) {
if (subs[0].rm_so == 0 && subs[0].rm_eo) {
/* match is at start of string, return empty string */
add_next_index_stringl(return_value, "", 0, 1);
/* skip ahead the length of the regex match */
strp += subs[0].rm_eo;
} else if (subs[0].rm_so == 0 && subs[0].rm_eo == 0) {
/* No more matches */
regfree(&re);
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid Regular Expression");
zend_hash_destroy(Z_ARRVAL_P(return_value));
efree(Z_ARRVAL_P(return_value));
RETURN_FALSE;
} else {
/* On a real match */
/* make a copy of the substring */
size = subs[0].rm_so;
/* add it to the array */
add_next_index_stringl(return_value, strp, size, 1);
/* point at our new starting point */
strp = strp + subs[0].rm_eo;
}
/* if we're only looking for a certain number of points,
stop looking once we hit it */
if (count != -1) {
count--;
}
}
/* see if we encountered an error */
if (err && err != REG_NOMATCH) {
php_ereg_eprint(err, &re TSRMLS_CC);
regfree(&re);
zend_hash_destroy(Z_ARRVAL_P(return_value));
efree(Z_ARRVAL_P(return_value));
RETURN_FALSE;
}
/* otherwise we just have one last element to add to the array */
size = endp - strp;
add_next_index_stringl(return_value, strp, size, 1);
regfree(&re);
}
/* }}} */
/* {{{ proto array split(string pattern, string string [, int limit])
Split string into array by regular expression */
PHP_FUNCTION(split)
{
php_split(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ proto array spliti(string pattern, string string [, int limit])
Split string into array by regular expression case-insensitive */
PHP_FUNCTION(spliti)
{
php_split(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
/* }}} */
/* {{{ proto string sql_regcase(string string)
Make regular expression for case insensitive match */
PHP_EREG_API PHP_FUNCTION(sql_regcase)
{
char *string, *tmp;
int string_len;
unsigned char c;
register int i, j;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &string, &string_len) == FAILURE) {
return;
}
tmp = safe_emalloc(string_len, 4, 1);
for (i = j = 0; i < string_len; i++) {
c = (unsigned char) string[i];
if (isalpha(c)) {
tmp[j++] = '[';
tmp[j++] = toupper(c);
tmp[j++] = tolower(c);
tmp[j++] = ']';
} else {
tmp[j++] = c;
}
}
tmp[j] = 0;
RETVAL_STRINGL(tmp, j, 1);
efree(tmp);
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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