1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 30 #include <stdio.h> 31 #include <string.h> 32 #include <uuid.h> 33 34 /* 35 * uuid_from_string() - convert a string representation of an UUID into 36 * a binary representation. 37 * See also: 38 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm 39 * 40 * NOTE: The sequence field is in big-endian, while the time fields are in 41 * native byte order. 42 */ 43 void 44 uuid_from_string(const char *s, uuid_t *u, uint32_t *status) 45 { 46 int n; 47 48 /* Short-circuit 2 special cases: NULL pointer and empty string. */ 49 if (s == NULL || *s == '\0') { 50 uuid_create_nil(u, status); 51 return; 52 } 53 54 /* Assume the worst. */ 55 if (status != NULL) 56 *status = uuid_s_invalid_string_uuid; 57 58 /* The UUID string representation has a fixed length. */ 59 if (strlen(s) != 36) 60 return; 61 62 /* 63 * We only work with "new" UUIDs. New UUIDs have the form: 64 * 01234567-89ab-cdef-0123-456789abcdef 65 * The so called "old" UUIDs, which we don't support, have the form: 66 * 0123456789ab.cd.ef.01.23.45.67.89.ab 67 */ 68 if (s[8] != '-') 69 return; 70 71 n = sscanf(s, 72 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx", 73 &u->time_low, &u->time_mid, &u->time_hi_and_version, 74 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0], 75 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]); 76 77 /* Make sure we have all conversions. */ 78 if (n != 11) 79 return; 80 81 /* We have a successful scan. Check semantics... */ 82 n = u->clock_seq_hi_and_reserved; 83 if ((n & 0x80) != 0x00 && /* variant 0? */ 84 (n & 0xc0) != 0x80 && /* variant 1? */ 85 (n & 0xe0) != 0xc0) { /* variant 2? */ 86 if (status != NULL) 87 *status = uuid_s_bad_version; 88 } else { 89 if (status != NULL) 90 *status = uuid_s_ok; 91 } 92 } 93