php-src/ext/standard/uniqid.c

86 lines
2.4 KiB
C

/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997, 1998, 1999 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.0 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_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Stig Sæther Bakken <ssb@guardian.no> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#include <errno.h>
#include <stdio.h>
#if MSVC5
#include "win32/time.h"
#else
#include <sys/time.h>
#endif
#include "../lcg/php_lcg.h"
#include "uniqid.h"
/* {{{ proto string uniqid(string prefix)
Generate a unique id */
PHP_FUNCTION(uniqid)
{
#ifdef HAVE_GETTIMEOFDAY
pval *prefix;
char uniqid[138];
int sec, usec;
struct timeval tv;
if (ARG_COUNT(ht) != 1 || getParameters(ht,1,&prefix)==FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string(prefix);
/* Do some bounds checking since we are using a char array. */
if (strlen(prefix->value.str.val) > 114) {
php_error(E_WARNING, "The prefix to uniqid should not be more than 114 characters.");
return;
}
gettimeofday((struct timeval *) &tv, (struct timezone *) NULL);
sec = (int) tv.tv_sec;
usec = (int) (tv.tv_usec % 1000000);
/* The max value usec can have is 0xF423F, so we use only five hex
* digits for usecs:
*/
sprintf(uniqid, "%s%08x%05x%.8f", prefix->value.str.val, sec, usec, php_combined_lcg() * 10);
RETURN_STRING(uniqid,1);
#endif
}
/* }}} */
function_entry uniqid_functions[] = {
{"uniqid", php3_uniqid, NULL},
{NULL, NULL, NULL}
};
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/