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Annotation of embedaddon/php/ext/standard/uniqid.c, revision 1.1.1.3

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | PHP Version 5                                                        |
                      4:    +----------------------------------------------------------------------+
1.1.1.3 ! misho       5:    | Copyright (c) 1997-2013 The PHP Group                                |
1.1       misho       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: 
1.1.1.2   misho      19: /* $Id$ */
1.1       misho      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
                     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:  */