lib/libc/uuid/uuid_to_string.c

   1 /*      $NetBSD: uuid_to_string.c,v 1.2 2008/04/23 07:52:32 plunky Exp $        */
   2
   3 /*-
   4  * Copyright (c) 2002 Marcel Moolenaar
   5  * Copyright (c) 2002 Hiten Mahesh Pandya
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/lib/libc/uuid/uuid_to_string.c,v 1.2 2003/08/08 19:18:43 marcel Exp $
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: uuid_to_string.c,v 1.2 2008/04/23 07:52:32 plunky Exp $");
  35 #endif
  36
  37 #include "namespace.h"
  38
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <uuid.h>
  42
  43 /*
  44  * uuid_to_string() - Convert a binary UUID into a string representation.
  45  * See also:
  46  *      http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm
  47  *
  48  * NOTE: The references given above do not have a status code for when
  49  *       the string could not be allocated. The status code has been
  50  *       taken from the Hewlett-Packard implementation.
  51  */
  52 void
  53 uuid_to_string(const uuid_t *u, char **s, uint32_t *status)
  54 {
  55         static const uuid_t nil = { .time_low = 0 };
  56
  57         if (status != NULL)
  58                 *status = uuid_s_ok;
  59
  60         /* Why allow a NULL-pointer here? */
  61         if (s == 0)
  62                 return;
  63
  64         if (u == NULL)
  65                 u = &nil;
  66
  67         asprintf(s, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
  68             u->time_low, u->time_mid, u->time_hi_and_version,
  69             u->clock_seq_hi_and_reserved, u->clock_seq_low, u->node[0],
  70             u->node[1], u->node[2], u->node[3], u->node[4], u->node[5]);
  71
  72         if (*s == NULL && status != NULL)
  73                 *status = uuid_s_no_memory;
  74 }