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      1 /*	$NetBSD: uuid_from_string.c,v 1.1 2004/09/13 21:44:54 thorpej 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_from_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_from_string.c,v 1.1 2004/09/13 21:44:54 thorpej 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_from_string() - convert a string representation of an UUID into
     45  *			a binary representation.
     46  * See also:
     47  *	http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
     48  *
     49  * NOTE: The sequence field is in big-endian, while the time fields are in
     50  *	 native byte order.
     51  */
     52 void
     53 uuid_from_string(const char *s, uuid_t *u, uint32_t *status)
     54 {
     55 	int n;
     56 
     57 	/* Short-circuit 2 special cases: NULL pointer and empty string. */
     58 	if (s == NULL || *s == '\0') {
     59 		uuid_create_nil(u, status);
     60 		return;
     61 	}
     62 
     63 	/* Assume the worst. */
     64 	if (status != NULL)
     65 		*status = uuid_s_invalid_string_uuid;
     66 
     67 	/* The UUID string representation has a fixed length. */
     68 	if (strlen(s) != 36)
     69 		return;
     70 
     71 	/*
     72 	 * We only work with "new" UUIDs. New UUIDs have the form:
     73 	 *	01234567-89ab-cdef-0123-456789abcdef
     74 	 * The so called "old" UUIDs, which we don't support, have the form:
     75 	 *	0123456789ab.cd.ef.01.23.45.67.89.ab
     76 	 */
     77 	if (s[8] != '-')
     78 		return;
     79 
     80 	n = sscanf(s,
     81 	    "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx",
     82 	    &u->time_low, &u->time_mid, &u->time_hi_and_version,
     83 	    &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0],
     84 	    &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]);
     85 
     86 	/* Make sure we have all conversions. */
     87 	if (n != 11)
     88 		return;
     89 
     90 	/* We have a successful scan. Check semantics... */
     91 	n = u->clock_seq_hi_and_reserved;
     92 	if ((n & 0x80) != 0x00 &&			/* variant 0? */
     93 	    (n & 0xc0) != 0x80 &&			/* variant 1? */
     94 	    (n & 0xe0) != 0xc0) {			/* variant 2? */
     95 		if (status != NULL)
     96 			*status = uuid_s_bad_version;
     97 	} else {
     98 		if (status != NULL)
     99 			*status = uuid_s_ok;
    100 	}
    101 }
    102