lib/libc/uuid/uuid_to_string.c

   1 /*-
   2  * Copyright (c) 2002,2005 Marcel Moolenaar
   3  * Copyright (c) 2002 Hiten Mahesh Pandya
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/lib/libc/uuid/uuid_to_string.c,v 1.3 2005/01/03 02:56:15 marcel Exp $
  28  * $DragonFly: src/lib/libc/uuid/uuid_to_string.c,v 1.1 2007/06/16 19:57:14 dillon Exp $
  29  */
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <uuid.h>
  34
  35 /*
  36  * uuid_to_string() - Convert a binary UUID into a string representation.
  37  * See also:
  38  *      http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm
  39  *
  40  * NOTE: The references given above do not have a status code for when
  41  *       the string could not be allocated. The status code has been
  42  *       taken from the Hewlett-Packard implementation.
  43  */
  44 void
  45 uuid_to_string(const uuid_t *u, char **s, uint32_t *status)
  46 {
  47         uuid_t nil;
  48
  49         if (status != NULL)
  50                 *status = uuid_s_ok;
  51
  52         /* Why allow a NULL-pointer here? */
  53         if (s == 0)
  54                 return;
  55
  56         if (u == NULL) {
  57                 u = &nil;
  58                 uuid_create_nil(&nil, NULL);
  59         }
  60
  61         asprintf(s, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  62             u->time_low, u->time_mid, u->time_hi_and_version,
  63             u->clock_seq_hi_and_reserved, u->clock_seq_low, u->node[0],
  64             u->node[1], u->node[2], u->node[3], u->node[4], u->node[5]);
  65
  66         if (*s == NULL && status != NULL)
  67                 *status = uuid_s_no_memory;
  68 }