xref: /csrg-svn/include/stdio.h (revision 69116)

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)stdio.h	8.5 (Berkeley) 04/29/95
 */

#ifndef	_STDIO_H_
#define	_STDIO_H_

#if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__)
#include <sys/types.h>
#endif

#include <sys/cdefs.h>

#include <machine/ansi.h>
#ifdef	_BSD_SIZE_T_
typedef	_BSD_SIZE_T_	size_t;
#undef	_BSD_SIZE_T_
#endif

#ifndef NULL
#define	NULL	0
#endif

/*
 * This is fairly grotesque, but pure ANSI code must not inspect the
 * innards of an fpos_t anyway.  The library internally uses off_t,
 * which we assume is exactly as big as eight chars.  (When we switch
 * to gcc 2.4 we will use __attribute__ here.)
 *
 * WARNING: the alignment constraints on an off_t and the struct below
 * differ on (e.g.) the SPARC.  Hence, the placement of an fpos_t object
 * in a structure will change if fpos_t's are not aligned on 8-byte
 * boundaries.  THIS IS A CROCK, but for now there is no way around it.
 */
#if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__)
typedef off_t fpos_t;
#else
typedef struct __sfpos {
	char	_pos[8];
} fpos_t;
#endif

#define	_FSTDIO			/* Define for new stdio with functions. */

/*
 * NB: to fit things in six character monocase externals, the stdio
 * code uses the prefix `__s' for stdio objects, typically followed
 * by a three-character attempt at a mnemonic.
 */

/* stdio buffers */
struct __sbuf {
	unsigned char *_base;
	int	_size;
};

/*
 * stdio state variables.
 *
 * The following always hold:
 *
 *	if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
 *		_lbfsize is -_bf._size, else _lbfsize is 0
 *	if _flags&__SRD, _w is 0
 *	if _flags&__SWR, _r is 0
 *
 * This ensures that the getc and putc macros (or inline functions) never
 * try to write or read from a file that is in `read' or `write' mode.
 * (Moreover, they can, and do, automatically switch from read mode to
 * write mode, and back, on "r+" and "w+" files.)
 *
 * _lbfsize is used only to make the inline line-buffered output stream
 * code as compact as possible.
 *
 * _ub, _up, and _ur are used when ungetc() pushes back more characters
 * than fit in the current _bf, or when ungetc() pushes back a character
 * that does not match the previous one in _bf.  When this happens,
 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
 *
 * NB: see WARNING above before changing the layout of this structure!
 */
typedef	struct __sFILE {
	unsigned char *_p;	/* current position in (some) buffer */
	int	_r;		/* read space left for getc() */
	int	_w;		/* write space left for putc() */
	short	_flags;		/* flags, below; this FILE is free if 0 */
	short	_file;		/* fileno, if Unix descriptor, else -1 */
	struct	__sbuf _bf;	/* the buffer (at least 1 byte, if !NULL) */
	int	_lbfsize;	/* 0 or -_bf._size, for inline putc */

	/* operations */
	void	*_cookie;	/* cookie passed to io functions */
	int	(*_close) __P((void *));
	int	(*_read)  __P((void *, char *, int));
	fpos_t	(*_seek)  __P((void *, fpos_t, int));
	int	(*_write) __P((void *, const char *, int));

	/* separate buffer for long sequences of ungetc() */
	struct	__sbuf _ub;	/* ungetc buffer */
	unsigned char *_up;	/* saved _p when _p is doing ungetc data */
	int	_ur;		/* saved _r when _r is counting ungetc data */

	/* tricks to meet minimum requirements even when malloc() fails */
	unsigned char _ubuf[3];	/* guarantee an ungetc() buffer */
	unsigned char _nbuf[1];	/* guarantee a getc() buffer */

	/* separate buffer for fgetln() when line crosses buffer boundary */
	struct	__sbuf _lb;	/* buffer for fgetln() */

	/* Unix stdio files get aligned to block boundaries on fseek() */
	int	_blksize;	/* stat.st_blksize (may be != _bf._size) */
	fpos_t	_offset;	/* current lseek offset (see WARNING) */
} FILE;

__BEGIN_DECLS
extern FILE __sF[];
__END_DECLS

#define	__SLBF	0x0001		/* line buffered */
#define	__SNBF	0x0002		/* unbuffered */
#define	__SRD	0x0004		/* OK to read */
#define	__SWR	0x0008		/* OK to write */
	/* RD and WR are never simultaneously asserted */
#define	__SRW	0x0010		/* open for reading & writing */
#define	__SEOF	0x0020		/* found EOF */
#define	__SERR	0x0040		/* found error */
#define	__SMBF	0x0080		/* _buf is from malloc */
#define	__SAPP	0x0100		/* fdopen()ed in append mode */
#define	__SSTR	0x0200		/* this is an sprintf/snprintf string */
#define	__SOPT	0x0400		/* do fseek() optimisation */
#define	__SNPT	0x0800		/* do not do fseek() optimisation */
#define	__SOFF	0x1000		/* set iff _offset is in fact correct */
#define	__SMOD	0x2000		/* true => fgetln modified _p text */

/*
 * The following three definitions are for ANSI C, which took them
 * from System V, which brilliantly took internal interface macros and
 * made them official arguments to setvbuf(), without renaming them.
 * Hence, these ugly _IOxxx names are *supposed* to appear in user code.
 *
 * Although numbered as their counterparts above, the implementation
 * does not rely on this.
 */
#define	_IOFBF	0		/* setvbuf should set fully buffered */
#define	_IOLBF	1		/* setvbuf should set line buffered */
#define	_IONBF	2		/* setvbuf should set unbuffered */

#define	BUFSIZ	1024		/* size of buffer used by setbuf */
#define	EOF	(-1)

/*
 * FOPEN_MAX is a minimum maximum, and is the number of streams that
 * stdio can provide without attempting to allocate further resources
 * (which could fail).  Do not use this for anything.
 */
				/* must be == _POSIX_STREAM_MAX <limits.h> */
#define	FOPEN_MAX	20	/* must be <= OPEN_MAX <sys/syslimits.h> */
#define	FILENAME_MAX	1024	/* must be <= PATH_MAX <sys/syslimits.h> */

/* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
#ifndef _ANSI_SOURCE
#define	P_tmpdir	"/var/tmp/"
#endif
#define	L_tmpnam	1024	/* XXX must be == PATH_MAX */
#define	TMP_MAX		308915776

#ifndef SEEK_SET
#define	SEEK_SET	0	/* set file offset to offset */
#endif
#ifndef SEEK_CUR
#define	SEEK_CUR	1	/* set file offset to current plus offset */
#endif
#ifndef SEEK_END
#define	SEEK_END	2	/* set file offset to EOF plus offset */
#endif

#define	stdin	(&__sF[0])
#define	stdout	(&__sF[1])
#define	stderr	(&__sF[2])

/*
 * Functions defined in ANSI C standard.
 */
__BEGIN_DECLS
void	 clearerr __P((FILE *));
int	 fclose __P((FILE *));
int	 feof __P((FILE *));
int	 ferror __P((FILE *));
int	 fflush __P((FILE *));
int	 fgetc __P((FILE *));
int	 fgetpos __P((FILE *, fpos_t *));
char	*fgets __P((char *, size_t, FILE *));
FILE	*fopen __P((const char *, const char *));
int	 fprintf __P((FILE *, const char *, ...));
int	 fputc __P((int, FILE *));
int	 fputs __P((const char *, FILE *));
size_t	 fread __P((void *, size_t, size_t, FILE *));
FILE	*freopen __P((const char *, const char *, FILE *));
int	 fscanf __P((FILE *, const char *, ...));
int	 fseek __P((FILE *, long, int));
int	 fsetpos __P((FILE *, const fpos_t *));
long	 ftell __P((FILE *));
size_t	 fwrite __P((const void *, size_t, size_t, FILE *));
int	 getc __P((FILE *));
int	 getchar __P((void));
char	*gets __P((char *));
#if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
extern int sys_nerr;			/* perror(3) external variables */
extern __const char *__const sys_errlist[];
#endif
void	 perror __P((const char *));
int	 printf __P((const char *, ...));
int	 putc __P((int, FILE *));
int	 putchar __P((int));
int	 puts __P((const char *));
int	 remove __P((const char *));
int	 rename  __P((const char *, const char *));
void	 rewind __P((FILE *));
int	 scanf __P((const char *, ...));
void	 setbuf __P((FILE *, char *));
int	 setvbuf __P((FILE *, char *, int, size_t));
int	 sprintf __P((char *, const char *, ...));
int	 sscanf __P((const char *, const char *, ...));
FILE	*tmpfile __P((void));
char	*tmpnam __P((char *));
int	 ungetc __P((int, FILE *));
int	 vfprintf __P((FILE *, const char *, _BSD_VA_LIST_));
int	 vprintf __P((const char *, _BSD_VA_LIST_));
int	 vsprintf __P((char *, const char *, _BSD_VA_LIST_));
__END_DECLS

/*
 * Functions defined in POSIX 1003.1.
 */
#ifndef _ANSI_SOURCE
#define	L_cuserid	9	/* size for cuserid(); UT_NAMESIZE + 1 */
#define	L_ctermid	1024	/* size for ctermid(); PATH_MAX */

__BEGIN_DECLS
char	*ctermid __P((char *));
FILE	*fdopen __P((int, const char *));
int	 fileno __P((FILE *));
__END_DECLS
#endif /* not ANSI */

/*
 * Routines that are purely local.
 */
#if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
__BEGIN_DECLS
char	*fgetln __P((FILE *, size_t *));
int	 fpurge __P((FILE *));
int	 getw __P((FILE *));
int	 pclose __P((FILE *));
FILE	*popen __P((const char *, const char *));
int	 putw __P((int, FILE *));
void	 setbuffer __P((FILE *, char *, int));
int	 setlinebuf __P((FILE *));
char	*tempnam __P((const char *, const char *));
int	 snprintf __P((char *, size_t, const char *, ...));
int	 vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_));
int	 vscanf __P((const char *, _BSD_VA_LIST_));
int	 vsscanf __P((const char *, const char *, _BSD_VA_LIST_));
FILE	*zopen __P((const char *, const char *, int));
__END_DECLS

/*
 * This is a #define because the function is used internally and
 * (unlike vfscanf) the name __svfscanf is guaranteed not to collide
 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined.
 */
#define	 vfscanf	__svfscanf

/*
 * Stdio function-access interface.
 */
__BEGIN_DECLS
FILE	*funopen __P((const void *,
		int (*)(void *, char *, int),
		int (*)(void *, const char *, int),
		fpos_t (*)(void *, fpos_t, int),
		int (*)(void *)));
__END_DECLS
#define	fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
#define	fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */

/*
 * Functions internal to the implementation.
 */
__BEGIN_DECLS
int	__srget __P((FILE *));
int	__svfscanf __P((FILE *, const char *, _BSD_VA_LIST_));
int	__swbuf __P((int, FILE *));
__END_DECLS

/*
 * The __sfoo macros are here so that we can
 * define function versions in the C library.
 */
#define	__sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++))
#if defined(__GNUC__) && defined(__STDC__)
static __inline int __sputc(int _c, FILE *_p) {
	if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n'))
		return (*_p->_p++ = _c);
	else
		return (__swbuf(_c, _p));
}
#else
/*
 * This has been tuned to generate reasonable code on the vax using pcc.
 */
#define	__sputc(c, p) \
	(--(p)->_w < 0 ? \
		(p)->_w >= (p)->_lbfsize ? \
			(*(p)->_p = (c)), *(p)->_p != '\n' ? \
				(int)*(p)->_p++ : \
				__swbuf('\n', p) : \
			__swbuf((int)(c), p) : \
		(*(p)->_p = (c), (int)*(p)->_p++))
#endif

#define	__sfeof(p)	(((p)->_flags & __SEOF) != 0)
#define	__sferror(p)	(((p)->_flags & __SERR) != 0)
#define	__sclearerr(p)	((void)((p)->_flags &= ~(__SERR|__SEOF)))
#define	__sfileno(p)	((p)->_file)

#define	feof(p)		__sfeof(p)
#define	ferror(p)	__sferror(p)
#define	clearerr(p)	__sclearerr(p)

#ifndef _ANSI_SOURCE
#define	fileno(p)	__sfileno(p)
#endif

#ifndef lint
#define	getc(fp)	__sgetc(fp)
#define putc(x, fp)	__sputc(x, fp)
#endif /* lint */

#define	getchar()	getc(stdin)
#define	putchar(x)	putc(x, stdout)
#endif /* _STDIO_H_ */