/*
 * Copyright © 2023 Nick Bowler
 *
 * License WTFPL2: Do What The Fuck You Want To Public License, version 2.
 * This is free software: you are free to do what the fuck you want to.
 * There is NO WARRANTY, to the extent permitted by law.
 */

#ifndef DX_XTRA_H_
#define DX_XTRA_H_

#define XTRA_PASTE(a, b) a ## b
#define XTRA_PASTE2(a, b) XTRA_PASTE(a, b)

#define XTRA_ARRAYSIZE(a) (sizeof (a) / sizeof (a)[0])

/*
 * This macro may be used to simplify construction of a 'struct option'
 * array from the packed format produced by gen-options.awk.
 *
 * Expanding this in a function will
 *
 *   (1) declare a constant array with static storage duration that
 *       contains the packed representation, and
 *   (2) declare an array of struct option of suitable length, with
 *       the given name, and
 *   (3) emit code to fill the struct option array from the packed
 *       representation.
 *
 * The uint_leastXX_t typedefs must be in scope in order to use this macro.
 */
#define XTRA_PACKED_LOPTS(name) \
	static const XTRA_PASTE2(XTRA_PASTE2(uint_least, LOPT_PACK_BITS2), _t) \
		name##_packed[] = { LOPTS_PACKED_INITIALIZER }; \
	struct option name[XTRA_ARRAYSIZE(name##_packed) + 1] = {0}; \
	do { \
		unsigned i; \
		for (i = 0; i < XTRA_ARRAYSIZE(name##_packed); i++) \
			LOPT_UNPACK(name[i], name##_packed[i]); \
	} while (0)

#endif