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15aa00d597
freebsd/include/stdio.h
Peter Wemm 15aa00d597 Add an implementation of the gnu-ish asprintf() and vasprintf(). They are 
not based on gpl'ed code, just prototype and usage.  I'm not 100% certain
they behave the same while the system is in trouble (eg: malloc() failing)
but in those circumstances all bets would be off anyway.

These routines work like sprintf() and vsprintf(), except that instead of
using a fixed buffer, they allocate memory and return it to the user
and it's the user's responsibility to free() it.  They have allocate as
much memory as they need (and can get), so the size of strings it can deal
with is limited only by the amount of memory it can malloc() on your
behalf.

There are a few gpl'ed programs starting to use this interface, and it's
becoming more common with the scares about security risks with sprintf().
I dont like the look of the code that the various programs (including
cvs, gdb, libg++, etc) provide if configure can't find it on the system.

It should be possible to modify the stdio core code to provide this
interface more efficiently, I was more worried about having something
that worked and was secure.  :-)  (I noticed that there was once intended
to be a smprintf() routine when our stdio was written for 4.4BSD, but it
looks pretty stillborn, and it's intended interface is not clear).  Since
Linux and gnu libc have this interface, it seemed silly to bring yet
another one onto the scene.
1996-05-27 10:49:43 +00:00

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/*-
* 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.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)stdio.h 8.4 (Berkeley) 1/4/94
*/
#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() optimization */
#define __SNPT 0x0800 /* do not do fseek() optimization */
#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 *, int, 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 __const 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
int asprintf __P((char **, const char *, ...));
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 vasprintf __P((char **, const char *, _BSD_VA_LIST_));
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_ */
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