Function is_hex_digit

app/redis-6.2.6/src/sds.c:953–956

Helper function for sdssplitargs() that returns non zero if 'c' * is a valid hex digit. */

/* Helper function for sdssplitargs() that returns non zero if 'c'
 * is a valid hex digit. */
int is_hex_digit(char c) {
    return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
           (c >= 'A' && c <= 'F');
}

/* Helper function for sdssplitargs() that converts a hex digit into an
 * integer from 0 to 15 */