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/* $Id$ */
/*
* Copyright (C)2003-2007 Benny Prijono <benny@prijono.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pj/guid.h>
#include <pj/os.h>
#include <pj/rand.h>
#include <pj/string.h>
const unsigned PJ_GUID_STRING_LENGTH=20;
static void init_mac_address(unsigned char mac_addr[16])
{
unsigned long *ulval1 = (unsigned long*) &mac_addr[0];
unsigned short *usval1 = (unsigned short*) &mac_addr[4];
*ulval1 = pj_rand();
*usval1 = (unsigned short) pj_rand();
}
PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str)
{
static int guid_initialized;
static unsigned pid;
static char str_pid[32];
static unsigned char mac_addr[32];
static char str_mac_addr[32];
static unsigned clock_seq;
PJ_CHECK_STACK();
if (guid_initialized == 0) {
pid = pj_getpid();
init_mac_address(mac_addr);
clock_seq = 0;
sprintf(str_pid, "%04x", pid);
sprintf(str_mac_addr, "%02x%02x%02x%02x%02x%02x",
mac_addr[0], mac_addr[1], mac_addr[2],
mac_addr[3], mac_addr[4], mac_addr[5]);
guid_initialized = 1;
}
strcpy(str->ptr, str_pid);
sprintf(str->ptr+4, "%04x", clock_seq++);
pj_memcpy(str->ptr+8, str_mac_addr, 12);
str->slen = 20;
return str;
}
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