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|
/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2002 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. |
+----------------------------------------------------------------------+
| Author: Stig Sæther Bakken <ssb@fast.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>
#ifdef PHP_WIN32
#include "win32/time.h"
#else
#include <sys/time.h>
#endif
#include "php_lcg.h"
#include "uniqid.h"
/* {{{ proto string uniqid(string prefix [, bool more_entropy])
Generates a unique ID */
PHP_FUNCTION(uniqid)
{
#ifdef HAVE_GETTIMEOFDAY
char *prefix;
zend_bool more_entropy = 0;
char uniqid[138];
int sec, usec, argc, prefix_len;
struct timeval tv;
argc = ZEND_NUM_ARGS();
if (zend_parse_parameters(argc TSRMLS_CC, "s|b", &prefix, &prefix_len,
&more_entropy)) {
return;
}
/* Do some bounds checking since we are using a char array. */
if (prefix_len > 114) {
php_error(E_WARNING, "The prefix to uniqid should not be more than 114 characters.");
return;
}
#if HAVE_USLEEP && !defined(PHP_WIN32)
if (!more_entropy) {
usleep(1);
}
#endif
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.
*/
if (more_entropy) {
sprintf(uniqid, "%s%08x%05x%.8f", prefix, sec, usec, php_combined_lcg(TSRMLS_C) * 10);
} else {
sprintf(uniqid, "%s%08x%05x", prefix, sec, usec);
}
RETURN_STRING(uniqid, 1);
#endif
}
/* }}} */
function_entry uniqid_functions[] = {
PHP_FE(uniqid, NULL)
{NULL, NULL, NULL}
};
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
