1                 : /*
       2                 :    +----------------------------------------------------------------------+
       3                 :    | PHP Version 6                                                        |
       4                 :    +----------------------------------------------------------------------+
       5                 :    | Copyright (c) 1997-2009 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: uniqid.c 279029 2009-04-20 06:55:11Z pajoye $ */
      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                 : #include <unicode/ustdio.h>
      31                 : 
      32                 : #include <stdio.h>
      33                 : #ifdef PHP_WIN32
      34                 : #include "win32/time.h"
      35                 : #else
      36                 : #include <sys/time.h>
      37                 : #endif
      38                 : 
      39                 : #include "php_lcg.h"
      40                 : #include "uniqid.h"
      41                 : 
      42                 : /* {{{ proto string uniqid([string prefix [, bool more_entropy]]) U
      43                 :    Generates a unique ID */
      44                 : #ifdef HAVE_GETTIMEOFDAY
      45                 : PHP_FUNCTION(uniqid)
      46           10970 : {
      47           10970 :         zstr prefix = EMPTY_ZSTR;
      48           10970 :         int prefix_len = 0;
      49           10970 :         zend_uchar str_type = IS_UNICODE;
      50                 : #if defined(__CYGWIN__)
      51                 :         zend_bool more_entropy = 1;
      52                 : #else
      53           10970 :         zend_bool more_entropy = 0;
      54                 : #endif
      55                 :         char *uniqid;
      56                 :         UChar *u_uniqid;
      57                 :         int sec, usec;
      58                 :         struct timeval tv;
      59                 : 
      60           10970 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|tb", &prefix,
      61                 :                                                           &prefix_len, &str_type, &more_entropy) == FAILURE) {
      62               4 :                 return;
      63                 :         }
      64                 : 
      65                 : #if HAVE_USLEEP && !defined(PHP_WIN32)
      66           10966 :         if (!more_entropy) {
      67                 : #if defined(__CYGWIN__)
      68                 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "You must use 'more entropy' under CYGWIN");
      69                 :                 RETURN_FALSE;
      70                 : #else
      71           10959 :                 usleep(1);
      72                 : #endif
      73                 :         }
      74                 : #endif
      75           10966 :         gettimeofday((struct timeval *) &tv, (struct timezone *) NULL);
      76           10966 :         sec = (int) tv.tv_sec;
      77           10966 :         usec = (int) (tv.tv_usec % 0x100000);
      78                 : 
      79                 :         /* The max value usec can have is 0xF423F, so we use only five hex
      80                 :          * digits for usecs.
      81                 :          */
      82           10966 :         if (str_type == IS_UNICODE) {
      83                 :                 /* prefix + 8 (sec) + 5 (usec) + 10 (lcg) */
      84           10966 :                 int buf_len = prefix_len + 8 + 5 + 10 + 1;
      85                 :                 int written;
      86                 : 
      87           10966 :                 u_uniqid = eumalloc(buf_len + 1);
      88           10966 :                 if (more_entropy) {
      89               7 :                         written = u_sprintf(u_uniqid, "%S%08x%05x%.8f", prefix.u, sec, usec, php_combined_lcg(TSRMLS_C) * 10);
      90                 :                 } else {
      91           10959 :                         written = u_sprintf(u_uniqid, "%S%08x%05x", prefix.u, sec, usec);
      92                 :                 }
      93           10966 :                 u_uniqid[written] = 0;
      94           10966 :                 RETURN_UNICODEL(u_uniqid, written, 0);
      95                 :         } else {
      96               0 :                 if (more_entropy) {
      97               0 :                         spprintf(&uniqid, 0, "%s%08x%05x%.8f", prefix.s, sec, usec, php_combined_lcg(TSRMLS_C) * 10);
      98                 :                 } else {
      99               0 :                         spprintf(&uniqid, 0, "%s%08x%05x", prefix.s, sec, usec);
     100                 :                 }
     101                 : 
     102               0 :                 RETURN_STRING(uniqid, 0);
     103                 :         }
     104                 : }
     105                 : #endif
     106                 : /* }}} */
     107                 : 
     108                 : /*
     109                 :  * Local variables:
     110                 :  * tab-width: 4
     111                 :  * c-basic-offset: 4
     112                 :  * End:
     113                 :  * vim600: sw=4 ts=4 fdm=marker
     114                 :  * vim<600: sw=4 ts=4
     115                 :  */