112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/*-
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* Copyright (c) 2015 M. Warner Losh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Note: some comments taken from lib/libc/uuid/uuid_to_string.c
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* Copyright (c) 2002,2005 Marcel Moolenaar
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* Copyright (c) 2002 Hiten Mahesh Pandya
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*/
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#include <stand.h>
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#include <uuid.h>
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/*
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* Dump len characters into *buf from val as hex and update *buf
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*/
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static void
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tohex(char **buf, int len, uint32_t val)
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{
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static const char *hexstr = "0123456789abcdef";
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char *walker = *buf;
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int i;
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for (i = len - 1; i >= 0; i--) {
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walker[i] = hexstr[val & 0xf];
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val >>= 4;
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}
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*buf = walker + len;
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}
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/*
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* uuid_to_string() - Convert a binary UUID into a string representation.
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm
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*
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* NOTE: The references given above do not have a status code for when
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* the string could not be allocated. The status code has been
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* taken from the Hewlett-Packard implementation.
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*
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* NOTE: we don't support u == NULL for a nil UUID, sorry.
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*
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* NOTE: The sequence field is in big-endian, while the time fields are in
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* native byte order.
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*
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* hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb
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* 01234567-89ab-cdef-0123-456789abcdef
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*/
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void
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uuid_to_string(const uuid_t *u, char **s, uint32_t *status)
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{
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uuid_t nil;
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char *w;
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if (status != NULL)
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*status = uuid_s_ok;
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if (s == NULL) /* Regular version does this odd-ball behavior too */
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return;
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w = *s = malloc(37);
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if (*s == NULL) {
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if (status != NULL)
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*status = uuid_s_no_memory;
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return;
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}
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if (u == NULL) {
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u = &nil;
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uuid_create_nil(&nil, NULL);
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}
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/* native */
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tohex(&w, 8, u->time_low);
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*w++ = '-';
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tohex(&w, 4, u->time_mid);
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*w++ = '-';
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tohex(&w, 4, u->time_hi_and_version);
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*w++ = '-';
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/* Big endian, so do a byte at a time */
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tohex(&w, 2, u->clock_seq_hi_and_reserved);
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tohex(&w, 2, u->clock_seq_low);
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*w++ = '-';
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tohex(&w, 2, u->node[0]);
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tohex(&w, 2, u->node[1]);
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tohex(&w, 2, u->node[2]);
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tohex(&w, 2, u->node[3]);
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tohex(&w, 2, u->node[4]);
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tohex(&w, 2, u->node[5]);
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*w++ = '\0';
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}
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