/* util.h
 *
 * Copyright (c) 2014 Tharre
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

#ifndef __RUTIL_H__
#define __RUTIL_H__

#include <stddef.h>
#include <stdint.h>
#include <stdio.h>

extern void *xmalloc(size_t size);
extern void *xrealloc(void *ptr, size_t size);
extern char *xstrdup(const char *str);
extern unsigned char *hash_file(FILE *fp);
extern void sha1_to_hex(const unsigned char *sha1, char *buf);
extern void hex_to_sha1(const char *s, unsigned char *sha1);
extern uint32_t generate_seed();

/* crazy macros for returning the number of arguments in __VA_ARGS__ */
/* See https://stackoverflow.com/questions/2308243/ */
#define PP_NARG(...) __PP_NARG(__VA_ARGS__, __PP_RSEQ_N())
#define __PP_NARG(...) __PP_ARG_N(__VA_ARGS__)
#define __PP_ARG_N(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13,     \
                   _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, \
                   _26, _27, _28, _29, _30, _31, _32, _33, _34, _35, _36, _37, \
                   _38, _39, _40, _41, _42, _43, _44, _45, _46, _47, _48, _49, \
                   _50, _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, _61, \
                   _62, _63, N, ...) N

#define __PP_RSEQ_N()                                                          \
	63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47,    \
	        46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32,    \
	        31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17,    \
	        16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0

#define concat(...) concat_(PP_NARG(__VA_ARGS__), __VA_ARGS__)

extern char *concat_(size_t count, ...);

#endif