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|
/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2017 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. |
+----------------------------------------------------------------------+
| Author: Stig Sæther Bakken <ssb@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#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"
#ifdef HAVE_GETTIMEOFDAY
ZEND_TLS struct timeval prev_tv = { 0, 0 };
/* {{{ proto string uniqid([string prefix [, bool more_entropy]])
Generates a unique ID */
PHP_FUNCTION(uniqid)
{
char *prefix = "";
zend_bool more_entropy = 0;
zend_string *uniqid;
int sec, usec;
size_t prefix_len = 0;
struct timeval tv;
ZEND_PARSE_PARAMETERS_START(0, 2)
Z_PARAM_OPTIONAL
Z_PARAM_STRING(prefix, prefix_len)
Z_PARAM_BOOL(more_entropy)
ZEND_PARSE_PARAMETERS_END();
/* This implementation needs current microsecond to change,
* hence we poll time until it does. This is much faster than
* calling usleep(1) which may cause the kernel to schedule
* another process, causing a pause of around 10ms.
*/
do {
(void)gettimeofday((struct timeval *) &tv, (struct timezone *) NULL);
} while (tv.tv_sec == prev_tv.tv_sec && tv.tv_usec == prev_tv.tv_usec);
prev_tv.tv_sec = tv.tv_sec;
prev_tv.tv_usec = tv.tv_usec;
sec = (int) tv.tv_sec;
usec = (int) (tv.tv_usec % 0x100000);
/* The max value usec can have is 0xF423F, so we use only five hex
* digits for usecs.
*/
if (more_entropy) {
uniqid = strpprintf(0, "%s%08x%05x%.8F", prefix, sec, usec, php_combined_lcg() * 10);
} else {
uniqid = strpprintf(0, "%s%08x%05x", prefix, sec, usec);
}
RETURN_STR(uniqid);
}
#endif
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
