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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. uint8_t * hexstr_to_bin(
  5.     char const * str) {
  6.  size_t const length = strlen(str);
  7.  uint8_t * result =
  8.     malloc((length + 1) / 2);
  9.  size_t it;
  10.  for (it = 0; it < length; ++it) {
  11.   char const c = str[it];
  12.   uint8_t const bin =
  13.      (c > '9') ?
  14.        (tolower(c) - 'a' + 10) : (c - '0');
  15.   if (it % 2 == 0) {
  16.    result[it / 2] = bin << 4;
  17.   } else {
  18.    result[it / 2] |= bin;
  19.   }
  20.  }
  21.  return result;
  22. }
  23.  
  24. int main(void) {
  25.  free(hexstr_to_bin("a9"));
  26.  return 0;
  27. }
Success #stdin #stdout 0s 2180KB
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https://ideone.com/fqlWnx
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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