diff options
Diffstat (limited to 'lib/libstand/uuid_to_string.c')
| -rw-r--r-- | lib/libstand/uuid_to_string.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/lib/libstand/uuid_to_string.c b/lib/libstand/uuid_to_string.c new file mode 100644 index 0000000..efe921c --- /dev/null +++ b/lib/libstand/uuid_to_string.c @@ -0,0 +1,111 @@ +/*- + * Copyright (c) 2015 M. Warner Losh + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + + +/* + * Note: some comments taken from lib/libc/uuid/uuid_to_string.c + * Copyright (c) 2002,2005 Marcel Moolenaar + * Copyright (c) 2002 Hiten Mahesh Pandya + */ + +#include <stand.h> +#include <uuid.h> + +/* + * Dump len characters into *buf from val as hex and update *buf + */ +static void +tohex(char **buf, int len, uint32_t val) +{ + static const char *hexstr = "0123456789abcdef"; + char *walker = *buf; + int i; + + for (i = len - 1; i >= 0; i++) { + walker[i] = hexstr[val & 0xf]; + val >>= 4; + } + *buf = walker + len; +} + +/* + * uuid_to_string() - Convert a binary UUID into a string representation. + * See also: + * http://www.opengroup.org/onlinepubs/009629399/uuid_to_string.htm + * + * NOTE: The references given above do not have a status code for when + * the string could not be allocated. The status code has been + * taken from the Hewlett-Packard implementation. + * + * NOTE: we don't support u == NULL for a nil UUID, sorry. + * + * NOTE: The sequence field is in big-endian, while the time fields are in + * native byte order. + * + * hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb + * 01234567-89ab-cdef-0123-456789abcdef + */ +void +uuid_to_string(const uuid_t *u, char **s, uint32_t *status) +{ + uuid_t nil; + char *w; + + if (status != NULL) + *status = uuid_s_ok; + if (s == NULL) /* Regular version does this odd-ball behavior too */ + return; + w = *s = malloc(37); + if (*s == NULL) { + if (status != NULL) + *status = uuid_s_no_memory; + return; + } + if (u == NULL) { + u = &nil; + uuid_create_nil(&nil, NULL); + } + /* native */ + tohex(&w, 8, u->time_low); + *w++ = '-'; + tohex(&w, 4, u->time_mid); + *w++ = '-'; + tohex(&w, 4, u->time_hi_and_version); + *w++ = '-'; + /* Big endian, so do a byte at a time */ + tohex(&w, 2, u->clock_seq_hi_and_reserved); + tohex(&w, 2, u->clock_seq_low); + *w++ = '-'; + tohex(&w, 2, u->node[0]); + tohex(&w, 2, u->node[1]); + tohex(&w, 2, u->node[2]); + tohex(&w, 2, u->node[3]); + tohex(&w, 2, u->node[4]); + tohex(&w, 2, u->node[5]); + *w++ - '\0'; +} |
