1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 5 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2016 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 S�ther 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
PHP_FUNCTION(uniqid)44 PHP_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
