72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* $Id$ */
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/*
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* Copyright (C)2003-2007 Benny Prijono <benny@prijono.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <pj/guid.h>
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#include <pj/os.h>
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#include <pj/rand.h>
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#include <pj/string.h>
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PJ_DEF_DATA(const unsigned) PJ_GUID_STRING_LENGTH=20;
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PJ_DEF(unsigned) pj_GUID_STRING_LENGTH()
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{
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return PJ_GUID_STRING_LENGTH;
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}
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static void init_mac_address(unsigned char mac_addr[16])
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{
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unsigned long *ulval1 = (unsigned long*) &mac_addr[0];
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unsigned short *usval1 = (unsigned short*) &mac_addr[4];
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*ulval1 = pj_rand();
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*usval1 = (unsigned short) pj_rand();
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}
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PJ_DEF(pj_str_t*) pj_generate_unique_string(pj_str_t *str)
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{
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static int guid_initialized;
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static unsigned pid;
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static char str_pid[32];
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static unsigned char mac_addr[32];
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static char str_mac_addr[32];
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static unsigned clock_seq;
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PJ_CHECK_STACK();
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if (guid_initialized == 0) {
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pid = pj_getpid();
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init_mac_address(mac_addr);
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clock_seq = 0;
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sprintf(str_pid, "%04x", pid);
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sprintf(str_mac_addr, "%02x%02x%02x%02x%02x%02x",
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mac_addr[0], mac_addr[1], mac_addr[2],
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mac_addr[3], mac_addr[4], mac_addr[5]);
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guid_initialized = 1;
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}
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strcpy(str->ptr, str_pid);
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sprintf(str->ptr+4, "%08x", clock_seq++);
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pj_memcpy(str->ptr+12, str_mac_addr, 8);
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str->slen = 20;
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return str;
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}
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