src/systemd/sd-id128.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #ifndef fooid128hfoo
   4 #define fooid128hfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2011 Lennart Poettering
  10
  11   systemd is free software; you can redistribute it and/or modify it
  12   under the terms of the GNU Lesser General Public License as published by
  13   the Free Software Foundation; either version 2.1 of the License, or
  14   (at your option) any later version.
  15
  16   systemd is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   Lesser General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  23 ***/
  24
  25 #include <inttypes.h>
  26 #include <stdbool.h>
  27 #include <string.h>
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 typedef union sd_id128 sd_id128_t;
  34
  35 union sd_id128 {
  36         uint8_t bytes[16];
  37         uint64_t qwords[2];
  38 };
  39
  40 char *sd_id128_to_string(sd_id128_t id, char s[33]);
  41
  42 int sd_id128_from_string(const char s[33], sd_id128_t *ret);
  43
  44 int sd_id128_randomize(sd_id128_t *ret);
  45
  46 int sd_id128_get_machine(sd_id128_t *ret);
  47
  48 int sd_id128_get_boot(sd_id128_t *ret);
  49
  50 #define SD_ID128_MAKE(v0, v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v15) \
  51         ((sd_id128_t) { .bytes = { 0x##v0, 0x##v1, 0x##v2, 0x##v3, 0x##v4, 0x##v5, 0x##v6, 0x##v7, \
  52                                    0x##v8, 0x##v9, 0x##v10, 0x##v11, 0x##v12, 0x##v13, 0x##v14, 0x##v15 }})
  53
  54 /* Note that SD_ID128_FORMAT_VAL will evaluate the passed argument 16
  55  * times. It is hence not a good idea to call this macro with an
  56  * expensive function as paramater or an expression with side
  57  * effects */
  58 #define SD_ID128_FORMAT_STR "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
  59 #define SD_ID128_FORMAT_VAL(x) (x).bytes[0], (x).bytes[1], (x).bytes[2], (x).bytes[3], (x).bytes[4], (x).bytes[5], (x).bytes[6], (x).bytes[7], (x).bytes[8], (x).bytes[9], (x).bytes[10], (x).bytes[11], (x).bytes[12], (x).bytes[13], (x).bytes[14], (x).bytes[15]
  60
  61 static inline bool sd_id128_equal(sd_id128_t a, sd_id128_t b) {
  62         return memcmp(&a, &b, 16) == 0;
  63 }
  64
  65 #ifdef __cplusplus
  66 }
  67 #endif
  68
  69 #endif