git.zerfleddert.de Git - hmcfgusb/blob - util.c

   1 /* utility functions
   2  *
   3  * Copyright (c) 2014 Michael Gernoth <michael@gernoth.net>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to
   7  * deal in the Software without restriction, including without limitation the
   8  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   9  * sell copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include <inttypes.h>
  25
  26 uint8_t ascii_to_nibble(uint8_t a)
  27 {
  28         uint8_t c = 0x00;
  29
  30         if ((a >= '0') && (a <= '9')) {
  31                 c = a - '0';
  32         } else if ((a >= 'A') && (a <= 'F')) {
  33                 c = (a - 'A') + 10;
  34         } else if ((a >= 'a') && (a <= 'f')) {
  35                 c = (a - 'a') + 10;
  36         }
  37
  38         return c;
  39 }
  40
  41 int validate_nibble(uint8_t a)
  42 {
  43         if (((a >= '0') && (a <= '9')) ||
  44             ((a >= 'A') && (a <= 'F')) ||
  45             ((a >= 'a') && (a <= 'f')))
  46                 return 1;
  47
  48         return 0;
  49 }
  50
  51 char nibble_to_ascii(uint8_t n)
  52 {
  53         const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
  54                 'A', 'B', 'C', 'D', 'E', 'F'};
  55
  56         return nibble[n];
  57 }