/*	tiffcompat.h	1.8	90/05/18	*/

#ifndef _COMPAT_
#define	_COMPAT_

/*
 * Copyright (c) 1990 by Sam Leffler.
 * All rights reserved.
 *
 * This file is provided for unrestricted use provided that this
 * legend is included on all tape media and as a part of the
 * software program in whole or part.  Users may copy, modify or
 * distribute this file at will.
 */

/*
 * This file contains a hodgepodge of definitions and
 * declarations that are needed to provide compatibility
 * between the native system and the base UNIX implementation
 * that the library assumes (~4BSD).  In particular, you
 * can override the standard i/o interface (read/write/lseek)
 * by redefining the ReadOK/WriteOK/SeekOK macros to your
 * liking.
 *
 * NB: This file is a mess.
 */
#if defined(__STDC__) || USE_PROTOTYPES
#include <stdio.h>
#endif
#include <sys/types.h>
#include <fcntl.h>
#ifdef THINK_C
#include <stdlib.h>
#endif

#ifdef SYSV
#include <unistd.h>

#define	L_SET	SEEK_SET
#define	L_INCR	SEEK_CUR
#define	L_XTND	SEEK_END

#define	bzero(dst,len)		memset(dst, 0, len)
#define	bcopy(src,dst,len)	memcpy(dst, src, len)
#define	bcmp(src, dst, len)	memcmp(dst, src, len)
#endif

#ifdef BSDTYPES
typedef	unsigned char u_char;
typedef	unsigned short u_short;
typedef	unsigned int u_int;
typedef	unsigned long u_long;
#endif

/*
 * Return an open file descriptor or -1.
 */
#if defined(applec) || defined(THINK_C)
#define	TIFFOpenFile(name, mode, prot)	open(name, mode)
#else
#if defined(MSDOS)
#define	TIFFOpenFile(name, mode, prot)	open(name, mode|O_BINARY, prot)
#else
#define	TIFFOpenFile(name, mode, prot)	open(name, mode, prot)
#endif
#endif

/*
 * Return the size in bytes of the file
 * associated with the supplied file descriptor.
 */
extern	long TIFFGetFileSize();

#ifndef L_SET
#define L_SET	0
#define L_INCR	1
#define L_XTND	2
#endif

#ifdef notdef
#define lseek unix_lseek	/* Mac's Standard 'lseek' won't extend file */
#endif
extern	long lseek();

#ifndef ReadOK
#define	ReadOK(fd, buf, size)	(read(fd, (char *)buf, size) == size)
#endif
#ifndef SeekOK
#define	SeekOK(fd, off)	(lseek(fd, (long)off, L_SET) == (long)off)
#endif
#ifndef WriteOK
#define	WriteOK(fd, buf, size)	(write(fd, (char *)buf, size) == size)
#endif

#if defined(__MACH__) || defined(THINK_C)
extern	void *malloc(size_t size);
extern	void *realloc(void *ptr, size_t size);
#else
#if defined(MSDOS)
#include <malloc.h>
#else
extern	char *malloc();
extern	char *realloc();
#endif
#endif

/*
 * dblparam_t is the type that a double precision
 * floating point value will have on the parameter
 * stack (when coerced by the compiler).
 */
#ifdef applec
typedef extended dblparam_t;
#else
typedef double dblparam_t;
#endif

/*
 * Varargs parameter list handling...YECH!!!!
 */
#if defined(__STDC__) && !defined(USE_VARARGS)
#define	USE_VARARGS	0
#endif

#if defined(USE_VARARGS)
#if USE_VARARGS
#include <varargs.h>
#define	VA_START(ap, parmN)	va_start(ap)
#else
#include <stdarg.h>
#define	VA_START(ap, parmN)	va_start(ap, parmN)
#endif
#endif /* defined(USE_VARARGS) */

/*
 * How to concatenate lexical tokens with
 * the C preprocessor -- more YECH!
 */
#if defined(__STDC__) && !defined(apollo)
#define	CAT(a,b)	a##b
#else
#define	IDENT(x)	x
#define	CAT(a,b)	IDENT(a)b
#endif

#if defined(__STDC__) && !defined(USE_PROTOTYPES)
#define	USE_PROTOTYPES	1
#endif
#endif /* _COMPAT_ */