1
/* $Id: guid_simple.c 3553 2011-05-05 06:14:19Z nanang $ */
3
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
4
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
6
* This program is free software; you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation; either version 2 of the License, or
9
* (at your option) any later version.
11
* This program is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
16
* You should have received a copy of the GNU General Public License
17
* along with this program; if not, write to the Free Software
18
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
#include <pj/assert.h>
24
#include <pj/string.h>
26
PJ_DEF_DATA(const unsigned) PJ_GUID_STRING_LENGTH=32;
28
static char guid_chars[64];
30
PJ_DEF(unsigned) pj_GUID_STRING_LENGTH()
32
return PJ_GUID_STRING_LENGTH;
35
static void init_guid_chars(void)
43
for (i=0; i<26; ++i) {
52
PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str)
58
if (guid_chars[0] == '\0') {
59
pj_enter_critical_section();
60
if (guid_chars[0] == '\0') {
63
pj_leave_critical_section();
66
/* This would only work if PJ_GUID_STRING_LENGTH is multiple of 2 bytes */
67
pj_assert(PJ_GUID_STRING_LENGTH % 2 == 0);
69
for (p=str->ptr, end=p+PJ_GUID_STRING_LENGTH; p<end; ) {
70
pj_uint32_t rand_val = pj_rand();
71
pj_uint32_t rand_idx = RAND_MAX;
73
for ( ; rand_idx>0 && p<end; rand_idx>>=8, rand_val>>=8, p++) {
74
*p = guid_chars[(rand_val & 0xFF) & 63];
78
str->slen = PJ_GUID_STRING_LENGTH;