hexdigit2bin.c

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/******************************************************************/
/******************************************************************/
signed char hexdigit2bin (
  unsigned char hexdigit
  )
{
  switch(hexdigit) {
    case '0' ... '9':
      return hexdigit - '0';
 
    case 'a' ... 'f':
    case 'A' ... 'F':
      return (hexdigit & ~0x20) - 'A' + 10;  //convert lower to upper
  }
  return -1;
}