File: scan_fromhex.c

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#include "scan.h"

int scan_fromhex(unsigned char c) {
  c-='0';
  if (c<=9) return c;
  c&=~0x20;
  c-='A'-'0';
  if (c<6) return c+10;
  return -1;
/* more readable but creates worse code:
  if (c>='0' && c<='9')
    return c-'0';
  else if (c>='A' && c<='F')
    return c-'A'+10;
  else if (c>='a' && c<='f')
    return c-'a'+10;
  return -1;
*/
}