DtMmdb: move to lib directory as a standalone library.
This commit is contained in:
Liang Chang
231
cde/lib/DtMmdb/misc/unique_id.c
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231
cde/lib/DtMmdb/misc/unique_id.c
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/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* Copyright (c) 1994 FUJITSU LIMITED */
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/* All Rights Reserved */
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/*
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* $XConsortium: unique_id.c /main/3 1996/06/11 17:40:45 cde-hal $
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*
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* Copyright (c) 1992 HAL Computer Systems International, Ltd.
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* All rights reserved. Unpublished -- rights reserved under
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* the Copyright Laws of the United States. USE OF A COPYRIGHT
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* NOTICE IS PRECAUTIONARY ONLY AND DOES NOT IMPLY PUBLICATION
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* OR DISCLOSURE.
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*
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* THIS SOFTWARE CONTAINS CONFIDENTIAL INFORMATION AND TRADE
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* SECRETS OF HAL COMPUTER SYSTEMS INTERNATIONAL, LTD. USE,
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* DISCLOSURE, OR REPRODUCTION IS PROHIBITED WITHOUT THE
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* PRIOR EXPRESS WRITTEN PERMISSION OF HAL COMPUTER SYSTEMS
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* INTERNATIONAL, LTD.
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*
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* RESTRICTED RIGHTS LEGEND
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* Use, duplication, or disclosure by the Government is subject
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* to the restrictions as set forth in subparagraph (c)(l)(ii)
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* of the Rights in Technical Data and Computer Software clause
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* at DFARS 252.227-7013.
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*
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* HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.
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* 1315 Dell Avenue
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* Campbell, CA 95008
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*
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#ifdef SVR4
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#include <sys/systeminfo.h>
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#endif
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/* **************************************************************
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* unique_id - generate a 15 character NULL terminated id
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* ************************************************************** */
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/* This code assumes:
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sizeof (time_t) == 4,
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sizeof (int) == 4,
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sizeof (short) == 2,
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sizeof ("hostid") == 4,
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sizeof ("pid") == 2,
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*/
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/* #define DEBUG */
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static char mapping[] =
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{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
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'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
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'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'.', '_' };
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static unsigned int mask[] =
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{ 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
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#define COPY_BITS(DEST,DPOS,SRC,SPOS,LEN) \
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DEST |= ((SRC & (mask[LEN] << SPOS)) >> SPOS) << DPOS;
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#define PRINT_BITS(BITS) \
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{ int i; unsigned long bits = BITS; printf (#BITS " = 0x%04x", BITS); \
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for (i = 0; i < sizeof(BITS) * 8; i++, bits <<= 1) { \
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if (!(i%4)) putchar (' '); \
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(bits & (1L << (sizeof(BITS) * 8)-1)) ? putchar('1') : putchar('0'); } \
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putchar ('\n'); }
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#if defined(hpux)
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#include <sys/utsname.h>
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static unsigned int
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gethostid()
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{
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struct utsname u;
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int i;
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i=uname(&u);
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if (i==-1)
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abort();
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if (u.idnumber[0])
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return atoi(u.idnumber);
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abort();
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}
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#elif defined(SVR4) && !defined(sun)
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static unsigned int
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gethostid()
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{
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char buffer[256];
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sysinfo (SI_HW_SERIAL, buffer, sizeof (buffer));
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return (atoi (buffer));
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}
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#endif
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const char *
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unique_id (void)
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{
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static char buf[16];
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static unsigned int hostid;
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static struct timeval cur_time, old_time;
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static unsigned short pid;
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static int i;
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/* -------- First get the information -------- */
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/* Loop until first char is alpha-numeric. */
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do
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{
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/* Loop over time until unique. */
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do
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{
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/* Failure of this call is catastrophic: */
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if (gettimeofday (&cur_time, NULL) == -1)
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{
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perror ("unique_id:gettimeofday");
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abort();
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}
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/* Truncate microseconds to milliseconds. */
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cur_time.tv_usec /= 1000;
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}
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while (cur_time.tv_usec == old_time.tv_usec &&
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cur_time.tv_sec == old_time.tv_sec);
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old_time.tv_usec = cur_time.tv_usec;
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old_time.tv_sec = cur_time.tv_sec;
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if (pid == 0)
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pid = getpid();
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if (hostid == 0)
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hostid = gethostid();
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#ifdef DEBUG
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PRINT_BITS ((unsigned int)cur_time.tv_usec);
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PRINT_BITS ((unsigned int)cur_time.tv_sec);
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PRINT_BITS (pid);
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PRINT_BITS (hostid);
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#endif
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for (i = 0; i < 15; i++)
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buf[i] = 0;
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COPY_BITS (buf[0], 0, cur_time.tv_usec, 0, 6);
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COPY_BITS (buf[1], 0, cur_time.tv_usec, 6, 4);
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COPY_BITS (buf[1], 4, cur_time.tv_sec, 0, 2);
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COPY_BITS (buf[2], 0, cur_time.tv_sec, 2, 6);
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COPY_BITS (buf[3], 0, cur_time.tv_sec, 8, 6);
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COPY_BITS (buf[4], 0, cur_time.tv_sec, 14, 6);
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COPY_BITS (buf[5], 0, cur_time.tv_sec, 20, 6);
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COPY_BITS (buf[6], 0, cur_time.tv_sec, 26, 6);
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COPY_BITS (buf[7], 0, pid, 0, 6);
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COPY_BITS (buf[8], 0, pid, 6, 6);
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COPY_BITS (buf[9], 0, pid, 12, 4);
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COPY_BITS (buf[9], 4, hostid, 0, 2);
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COPY_BITS (buf[10], 0, hostid, 2, 6);
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COPY_BITS (buf[11], 0, hostid, 8, 6);
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COPY_BITS (buf[12], 0, hostid, 14, 6);
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COPY_BITS (buf[13], 0, hostid, 20, 6);
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COPY_BITS (buf[14], 0, hostid, 26, 6);
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for (i = 0; i < 15; i++)
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{
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#ifdef DEBUG
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unsigned char ch = buf[i];
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printf ("%2d 0x%02x ", i, ch);
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PRINT_BITS (ch);
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#endif
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buf[i] = mapping[(int)buf[i]];
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}
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} while (!isalnum ((unsigned char) buf[0]));
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return (buf);
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}
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#ifdef TEST
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int
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main (int argc, char **argv)
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{
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int count = 0;
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int i;
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if (argc == 1)
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count = 1;
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else if (argc == 2)
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count = atoi (argv[1]);
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if (count == 0)
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{
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printf (stderr, "usage: uid [count]");
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exit (1);
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}
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printf ("Generating %d unique ids\n", count);
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for (i = 0; i < count; i++)
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puts (unique_id());
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}
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#endif /* TEST */
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