1/*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2015 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Author: Stig Sæther Bakken <ssb@php.net> |
16 +----------------------------------------------------------------------+
17 */
18
19/* $Id$ */
20
21#include "php.h"
22
23#include <stdlib.h>
24#if HAVE_UNISTD_H
25#include <unistd.h>
26#endif
27
28#include <string.h>
29#include <errno.h>
30
31#include <stdio.h>
32#ifdef PHP_WIN32
33#include "win32/time.h"
34#else
35#include <sys/time.h>
36#endif
37
38#include "php_lcg.h"
39#include "uniqid.h"
40
41/* {{{ proto string uniqid([string prefix [, bool more_entropy]])
42 Generates a unique ID */
43#ifdef HAVE_GETTIMEOFDAY
44PHP_FUNCTION(uniqid)
45{
46 char *prefix = "";
47#if defined(__CYGWIN__)
48 zend_bool more_entropy = 1;
49#else
50 zend_bool more_entropy = 0;
51#endif
52 char *uniqid;
53 int sec, usec, prefix_len = 0;
54 struct timeval tv;
55
56 if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|sb", &prefix, &prefix_len,
57 &more_entropy)) {
58 return;
59 }
60
61#if HAVE_USLEEP && !defined(PHP_WIN32)
62 if (!more_entropy) {
63#if defined(__CYGWIN__)
64 php_error_docref(NULL TSRMLS_CC, E_WARNING, "You must use 'more entropy' under CYGWIN");
65 RETURN_FALSE;
66#else
67 usleep(1);
68#endif
69 }
70#endif
71 gettimeofday((struct timeval *) &tv, (struct timezone *) NULL);
72 sec = (int) tv.tv_sec;
73 usec = (int) (tv.tv_usec % 0x100000);
74
75 /* The max value usec can have is 0xF423F, so we use only five hex
76 * digits for usecs.
77 */
78 if (more_entropy) {
79 spprintf(&uniqid, 0, "%s%08x%05x%.8F", prefix, sec, usec, php_combined_lcg(TSRMLS_C) * 10);
80 } else {
81 spprintf(&uniqid, 0, "%s%08x%05x", prefix, sec, usec);
82 }
83
84 RETURN_STRING(uniqid, 0);
85}
86#endif
87/* }}} */
88
89/*
90 * Local variables:
91 * tab-width: 4
92 * c-basic-offset: 4
93 * End:
94 * vim600: sw=4 ts=4 fdm=marker
95 * vim<600: sw=4 ts=4
96 */
97