#ifndef COMPAT_H
#define COMPAT_H

#include <sys/types.h>
#include <limits.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

#ifndef __OpenBSD__
#ifndef __dead
#if defined(__GNUC__) || defined(__clang__)
#define __dead __attribute__((noreturn))
#else
#define __dead
#endif
#endif

#ifndef HOST_NAME_MAX
#ifdef _POSIX_HOST_NAME_MAX
#define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
#else
#define HOST_NAME_MAX 255
#endif
#endif

#ifndef LOGIN_NAME_MAX
#ifdef _POSIX_LOGIN_NAME_MAX
#define LOGIN_NAME_MAX _POSIX_LOGIN_NAME_MAX
#else
#define LOGIN_NAME_MAX 256
#endif
#endif

#ifndef HAVE_STRTONUM
#define HAVE_STRTONUM
long long strtonum(const char *numstr, long long minval, long long maxval,
    const char **errstrp);
#endif

#ifndef HAVE_STRLCPY
#define HAVE_STRLCPY
size_t strlcpy(char *dst, const char *src, size_t siz);
#endif

#ifndef HAVE_ERR
#define HAVE_ERR
void err(int eval, const char *fmt, ...);
void errx(int eval, const char *fmt, ...);
void warn(const char *fmt, ...);
void warnx(const char *fmt, ...);
#endif

#ifndef HAVE_TIMESPECADD
#define HAVE_TIMESPECADD
#define timespecadd(tsp, usp, vsp) \
	do { \
		(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec; \
		(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec; \
		if ((vsp)->tv_nsec >= 1000000000L) { \
			(vsp)->tv_sec++; \
			(vsp)->tv_nsec -= 1000000000L; \
		} \
	} while (0)
#define timespecsub(tsp, usp, vsp) \
	do { \
		(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec; \
		(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec; \
		if ((vsp)->tv_nsec < 0) { \
			(vsp)->tv_sec--; \
			(vsp)->tv_nsec += 1000000000L; \
		} \
	} while (0)
#endif

#ifndef HAVE_PLEDGE
#define HAVE_PLEDGE
static inline int pledge(const char *promises, const char *execpromises) {
	(void)promises;
	(void)execpromises;
	return 0;
}
#endif

#if !defined(__OpenBSD__)
#include <poll.h>
#include <time.h>
#include <signal.h>
int ppoll(struct pollfd *fds, nfds_t nfds, const struct timespec *timeout_ts,
    const sigset_t *sigmask);
#endif

#if defined(__APPLE__) && !defined(HAVE_STRNVIS)
#define HAVE_STRNVIS
#ifndef COMPAT_C_IMPL
int strnvis_openbsd(char *dst, const char *src, size_t dlen, int flags);
#define strnvis strnvis_openbsd
#endif
#endif

#ifndef HAVE_B64_NTOP
#define HAVE_B64_NTOP
#ifndef u_char
#define u_char unsigned char
#endif
int b64_ntop(u_char const *src, size_t srclength, char *target, size_t targsize);
#endif
#endif

#if defined(__linux__) && !defined(HAVE_FUNOPEN)
#define HAVE_FUNOPEN
#define _GNU_SOURCE
#include <stdio.h>
FILE *funopen(const void *cookie, 
    int (*readfn)(void *, char *, int),
    int (*writefn)(void *, const char *, int),
    fpos_t (*seekfn)(void *, fpos_t, int),
    int (*closefn)(void *));
#endif

#endif