thodg/ext4fs/uuid.c

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• Hash : 869bc2b9
  Author : Thomas de Grivel
  Date : 2025-06-30T02:03:02
  

  fix uuid print
  

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• uuid.c

• /* ext4fs
   * Copyright 2025 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include <stdio.h>
  
  #include <uuid.h>
  
  void arc4random_buf(void *buf, size_t n);
  
  void uuid_print(const uint8_t uuid[16]) {
    printf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-"
           "%02x%02x%02x%02x%02x%02x",
           uuid[0], uuid[1], uuid[2], uuid[3],
           uuid[4], uuid[5],
           uuid[6], uuid[7],
           uuid[8], uuid[9],
           uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
  }
  
  void uuid_v4_gen(uint8_t uuid[16]) {
    arc4random_buf(uuid, 16);
    uuid[6] = (uuid[6] & 0x0F) | 0x40; // version 4 (0100xxxx)
    uuid[8] = (uuid[8] & 0x3F) | 0x80; // RFC 4122  (10xxxxxx)
  }
  

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