Function hexDigitValue

ThirdParty/sqlite/vtksqlite/shell.c:1356–1361

** Return the value of a hexadecimal digit. Return -1 if the input ** is not a hex digit. */

** is not a hex digit.
*/
static int hexDigitValue(char c){
  if( c>='0' && c<='9' ) return c - '0';
  if( c>='a' && c<='f' ) return c - 'a' + 10;
  if( c>='A' && c<='F' ) return c - 'A' + 10;
  return -1;
}

/*
** Interpret zArg as an integer value, possibly with suffixes.