1/*
2   +----------------------------------------------------------------------+
3   | PHP Version 5                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2014 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
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