1 /*- 2 * Copyright (c) 2015 M. Warner Losh <imp@FreeBSD.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 29 /* 30 * Note: some comments taken from lib/libc/uuid/uuid_to_string.c 31 * Copyright (c) 2002,2005 Marcel Moolenaar 32 * Copyright (c) 2002 Hiten Mahesh Pandya 33 */ 34 35 #include <stand.h> 36 #include <uuid.h> 37 38 /* 39 * Dump len characters into *buf from val as hex and update *buf 40 */ 41 static void 42 tohex(char **buf, int len, uint32_t val) 43 { 44 static const char *hexstr = "0123456789abcdef"; 45 char *walker = *buf; 46 int i; 47 48 for (i = len - 1; i >= 0; i--) { 49 walker[i] = hexstr[val & 0xf]; 50 val >>= 4; 51 } 52 *buf = walker + len; 53 } 54 55 /* 56 * uuid_to_string() - Convert a binary UUID into a string representation. 57 * See also: 58 * http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm 59 * 60 * NOTE: The references given above do not have a status code for when 61 * the string could not be allocated. The status code has been 62 * taken from the Hewlett-Packard implementation. 63 * 64 * NOTE: we don't support u == NULL for a nil UUID, sorry. 65 * 66 * NOTE: The sequence field is in big-endian, while the time fields are in 67 * native byte order. 68 * 69 * hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb 70 * 01234567-89ab-cdef-0123-456789abcdef 71 */ 72 void 73 uuid_to_string(const uuid_t *u, char **s, uint32_t *status) 74 { 75 uuid_t nil; 76 char *w; 77 78 if (status != NULL) 79 *status = uuid_s_ok; 80 if (s == NULL) /* Regular version does this odd-ball behavior too */ 81 return; 82 w = *s = malloc(37); 83 if (*s == NULL) { 84 if (status != NULL) 85 *status = uuid_s_no_memory; 86 return; 87 } 88 if (u == NULL) { 89 u = &nil; 90 uuid_create_nil(&nil, NULL); 91 } 92 /* native */ 93 tohex(&w, 8, u->time_low); 94 *w++ = '-'; 95 tohex(&w, 4, u->time_mid); 96 *w++ = '-'; 97 tohex(&w, 4, u->time_hi_and_version); 98 *w++ = '-'; 99 /* Big endian, so do a byte at a time */ 100 tohex(&w, 2, u->clock_seq_hi_and_reserved); 101 tohex(&w, 2, u->clock_seq_low); 102 *w++ = '-'; 103 tohex(&w, 2, u->node[0]); 104 tohex(&w, 2, u->node[1]); 105 tohex(&w, 2, u->node[2]); 106 tohex(&w, 2, u->node[3]); 107 tohex(&w, 2, u->node[4]); 108 tohex(&w, 2, u->node[5]); 109 *w++ = '\0'; 110 } 111