1 /* $OpenBSD: uuid_from_string.c,v 1.3 2021/08/30 20:41:33 krw Exp $ */ 2 /* $NetBSD: uuid_from_string.c,v 1.1 2004/09/13 21:44:54 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 2002 Marcel Moolenaar 6 * Copyright (c) 2002 Hiten Mahesh Pandya 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: src/lib/libc/uuid/uuid_from_string.c,v 1.2 2003/08/08 19:18:43 marcel Exp $ 31 */ 32 33 #include <ctype.h> 34 #include <stdio.h> 35 #include <string.h> 36 #include <uuid.h> 37 38 /* 39 * uuid_from_string() - convert a string representation of an UUID into 40 * a binary representation. 41 * See also: 42 * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm 43 * 44 * NOTE: The sequence field is in big-endian, while the time fields are in 45 * native byte order. 46 */ 47 void 48 uuid_from_string(const char *s, uuid_t *u, uint32_t *status) 49 { 50 int n; 51 52 /* Short-circuit 2 special cases: NULL pointer and empty string. */ 53 if (s == NULL || *s == '\0') { 54 uuid_create_nil(u, status); 55 return; 56 } 57 58 /* Assume the worst. */ 59 if (status != NULL) 60 *status = uuid_s_invalid_string_uuid; 61 62 /* The UUID string representation has a fixed length. */ 63 if (strlen(s) != UUID_STR_LEN) 64 return; 65 66 /* 67 * We only work with "new" UUIDs. New UUIDs have the form: 68 * 01234567-89ab-cdef-0123-456789abcdef 69 * The so called "old" UUIDs, which we don't support, have the form: 70 * 0123456789ab.cd.ef.01.23.45.67.89.ab 71 */ 72 for (n = 0; n < UUID_STR_LEN; n++) { 73 switch (n) { 74 case 8: 75 case 13: 76 case 18: 77 case 23: 78 if (s[n] != '-') 79 return; 80 break; 81 default: 82 if (!isxdigit((unsigned char)(s[n]))) 83 return; 84 break; 85 } 86 } 87 88 n = sscanf(s, 89 "%8x-%4hx-%4hx-%2hhx%2hhx-%2hhx%2hhx%2hhx%2hhx%2hhx%2hhx", 90 &u->time_low, &u->time_mid, &u->time_hi_and_version, 91 &u->clock_seq_hi_and_reserved, &u->clock_seq_low, &u->node[0], 92 &u->node[1], &u->node[2], &u->node[3], &u->node[4], &u->node[5]); 93 94 /* Make sure we have all conversions. */ 95 if (n != 11) 96 return; 97 98 /* We have a successful scan. Check semantics... */ 99 n = u->clock_seq_hi_and_reserved; 100 if ((n & 0x80) != 0x00 && /* variant 0? */ 101 (n & 0xc0) != 0x80 && /* variant 1? */ 102 (n & 0xe0) != 0xc0) { /* variant 2? */ 103 if (status != NULL) 104 *status = uuid_s_bad_version; 105 } else { 106 if (status != NULL) 107 *status = uuid_s_ok; 108 } 109 } 110