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RIOT/tests/lwip/common.c 1.07 KB
a752c7ab   elopes   add first test an...
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  /*
   * Copyright (C) Freie Universitรคt Berlin
   *
   * This file is subject to the terms and conditions of the GNU Lesser
   * General Public License v2.1. See the file LICENSE in the top level
   * directory for more details.
   */
  
  /**
   * @{
   *
   * @file
   * @author Martine Lenders <mlenders@inf.fu-berlin.de>
   */
  
  #include <stdbool.h>
  
  #include "common.h"
  
  size_t hex2ints(uint8_t *out, const char *in)
  {
      bool upper = true;
      size_t out_size = 0;
  
      while (*in != '\0') {
          char c;
          if ((*in >= '0') && (*in <= '9')) {
              c = '0';
          }
          else if ((*in >= 'a') && (*in <= 'f')) {
              c = 'a' - 10;
          }
          else if ((*in >= 'A') && (*in <= 'F')) {
              c = 'A' - 10;
          }
          else {
              in++;
              continue;
          }
          if (upper) {
              *out = (char)(*in - c) << 4;
          }
          else {
              *out |= (char)(*in - c);
              out++;
              out_size++;
          }
          upper = !upper;
          in++;
      }
      if (!upper) {
          out_size++;
      }
      return out_size;
  }
  
  /** @} */