2 This file is part of elogind.
4 Copyright 2016 Lennart Poettering
6 elogind is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 elogind is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with elogind; If not, see <http://www.gnu.org/licenses/>.
23 #include "hexdecoct.h"
24 #include "id128-util.h"
26 #include "stdio-util.h"
28 char *id128_to_uuid_string(sd_id128_t id, char s[37]) {
33 /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */
35 for (n = 0; n < 16; n++) {
37 if (IN_SET(n, 4, 6, 8, 10))
40 s[k++] = hexchar(id.bytes[n] >> 4);
41 s[k++] = hexchar(id.bytes[n] & 0xF);
51 bool id128_is_valid(const char *s) {
59 /* Plain formatted 128bit hex string */
61 for (i = 0; i < l; i++) {
64 if (!(c >= '0' && c <= '9') &&
65 !(c >= 'a' && c <= 'z') &&
66 !(c >= 'A' && c <= 'Z'))
74 for (i = 0; i < l; i++) {
77 if ((i == 8 || i == 13 || i == 18 || i == 23)) {
81 if (!(c >= '0' && c <= '9') &&
82 !(c >= 'a' && c <= 'z') &&
83 !(c >= 'A' && c <= 'Z'))
94 int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
99 assert(f < _ID128_FORMAT_MAX);
101 /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both
102 * followed by a newline and nothing else. */
104 l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 33 or 37 chars */
107 if (l == 0) /* empty? */
114 if (buffer[32] != '\n')
119 } else if (l == 37) {
120 if (f == ID128_PLAIN)
123 if (buffer[36] != '\n')
130 return sd_id128_from_string(buffer, ret);
133 int id128_read(const char *p, Id128Format f, sd_id128_t *ret) {
134 _cleanup_close_ int fd = -1;
136 fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY);
140 return id128_read_fd(fd, f, ret);
143 int id128_write_fd(int fd, Id128Format f, sd_id128_t id) {
148 assert(f < _ID128_FORMAT_MAX);
150 if (f != ID128_UUID) {
151 sd_id128_to_string(id, buffer);
155 id128_to_uuid_string(id, buffer);
160 return loop_write(fd, buffer, sz, false);
163 int id128_write(const char *p, Id128Format f, sd_id128_t id) {
164 _cleanup_close_ int fd = -1;
166 fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
170 return id128_write_fd(fd, f, id);