1 /*- 2 * Copyright (c) 2002 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_from_string.c,v 1.2 2003/08/08 19:18:43 marcel Exp $ 28 * $DragonFly: src/lib/libc/uuid/uuid_from_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_from_string() - convert a string representation of an UUID into 37 * a binary representation. 38 * See also: 39 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm 40 * 41 * NOTE: The sequence field is in big-endian, while the time fields are in 42 * native byte order. 43 */ 44 void 45 uuid_from_string(const char *s, uuid_t *u, uint32_t *status) 46 { 47 int n; 48 49 /* Short-circuit 2 special cases: NULL pointer and empty string. */ 50 if (s == NULL || *s == '\0') { 51 uuid_create_nil(u, status); 52 return; 53 } 54 55 /* Assume the worst. */ 56 if (status != NULL) 57 *status = uuid_s_invalid_string_uuid; 58 59 /* The UUID string representation has a fixed length. */ 60 if (strlen(s) != 36) 61 return; 62 63 /* 64 * We only work with "new" UUIDs. New UUIDs have the form: 65 * 01234567-89ab-cdef-0123-456789abcdef 66 * The so called "old" UUIDs, which we don't support, have the form: 67 * 0123456789ab.cd.ef.01.23.45.67.89.ab 68 */ 69 if (s[8] != '-') 70 return; 71 72 n = sscanf(s, 73 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx", 74 &u->time_low, &u->time_mid, &u->time_hi_and_version, 75 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0], 76 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]); 77 78 /* Make sure we have all conversions. */ 79 if (n != 11) 80 return; 81 82 /* We have a successful scan. Check semantics... */ 83 n = u->clock_seq_hi_and_reserved; 84 if ((n & 0x80) != 0x00 && /* variant 0? */ 85 (n & 0xc0) != 0x80 && /* variant 1? */ 86 (n & 0xe0) != 0xc0) { /* variant 2? */ 87 if (status != NULL) 88 *status = uuid_s_bad_version; 89 } else { 90 if (status != NULL) 91 *status = uuid_s_ok; 92 } 93 } 94