char conv_ctoi (char c) { if (class_num (c)) { return c - '0'; } else if (class_upper (c)) { return c - 'A' + (char) 10; } return (char) (-1); }
bool class_alpha (char c) { return (class_lower (c) || class_upper (c)); }
static void MANGLE_LOWER_AT (char *arr, const int pos) { if (class_upper (arr[pos])) arr[pos] ^= 0x20; }