6b841db2ba
Bug: 17164505 Change-Id: I59e28a08ff8b6ab632230b11a5807cfd5278aeb5
464 lines
15 KiB
C
464 lines
15 KiB
C
/* $OpenBSD: stdio.h,v 1.35 2006/01/13 18:10:09 miod Exp $ */
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/* $NetBSD: stdio.h,v 1.18 1996/04/25 18:29:21 jtc Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)stdio.h 5.17 (Berkeley) 6/3/91
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*/
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#ifndef _STDIO_H_
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#define _STDIO_H_
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/*
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* This file must contain a reference to __gnuc_va_list so that GCC's
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* fixincludes knows that that's what's being used for va_list, and so
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* to leave our <stdio.h> alone. (fixincludes gets in the way of pointing
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* one toolchain at various different sets of platform headers.)
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* If you alter this comment, be sure to keep "__gnuc_va_list" in it!
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <stdarg.h>
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#include <stddef.h>
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#define __need_NULL
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#include <stddef.h>
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#define _FSTDIO /* Define for new stdio with functions. */
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typedef off_t fpos_t; /* stdio file position type */
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/*
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* NB: to fit things in six character monocase externals, the stdio
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* code uses the prefix `__s' for stdio objects, typically followed
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* by a three-character attempt at a mnemonic.
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*/
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/* stdio buffers */
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struct __sbuf {
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unsigned char *_base;
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int _size;
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};
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/*
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* stdio state variables.
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*
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* The following always hold:
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*
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* if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
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* _lbfsize is -_bf._size, else _lbfsize is 0
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* if _flags&__SRD, _w is 0
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* if _flags&__SWR, _r is 0
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*
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* This ensures that the getc and putc macros (or inline functions) never
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* try to write or read from a file that is in `read' or `write' mode.
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* (Moreover, they can, and do, automatically switch from read mode to
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* write mode, and back, on "r+" and "w+" files.)
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*
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* _lbfsize is used only to make the inline line-buffered output stream
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* code as compact as possible.
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*
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* _ub, _up, and _ur are used when ungetc() pushes back more characters
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* than fit in the current _bf, or when ungetc() pushes back a character
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* that does not match the previous one in _bf. When this happens,
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* _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
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* _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
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*
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* NOTE: if you change this structure, you also need to update the
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* std() initializer in findfp.c.
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*/
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typedef struct __sFILE {
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unsigned char *_p; /* current position in (some) buffer */
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int _r; /* read space left for getc() */
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int _w; /* write space left for putc() */
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short _flags; /* flags, below; this FILE is free if 0 */
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short _file; /* fileno, if Unix descriptor, else -1 */
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struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
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int _lbfsize; /* 0 or -_bf._size, for inline putc */
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/* operations */
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void *_cookie; /* cookie passed to io functions */
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int (*_close)(void *);
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int (*_read)(void *, char *, int);
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fpos_t (*_seek)(void *, fpos_t, int);
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int (*_write)(void *, const char *, int);
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/* extension data, to avoid further ABI breakage */
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struct __sbuf _ext;
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/* data for long sequences of ungetc() */
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unsigned char *_up; /* saved _p when _p is doing ungetc data */
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int _ur; /* saved _r when _r is counting ungetc data */
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/* tricks to meet minimum requirements even when malloc() fails */
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unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
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unsigned char _nbuf[1]; /* guarantee a getc() buffer */
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/* separate buffer for fgetln() when line crosses buffer boundary */
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struct __sbuf _lb; /* buffer for fgetln() */
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/* Unix stdio files get aligned to block boundaries on fseek() */
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int _blksize; /* stat.st_blksize (may be != _bf._size) */
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fpos_t _offset; /* current lseek offset */
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} FILE;
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__BEGIN_DECLS
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extern FILE __sF[];
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__END_DECLS
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#define __SLBF 0x0001 /* line buffered */
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#define __SNBF 0x0002 /* unbuffered */
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#define __SRD 0x0004 /* OK to read */
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#define __SWR 0x0008 /* OK to write */
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/* RD and WR are never simultaneously asserted */
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#define __SRW 0x0010 /* open for reading & writing */
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#define __SEOF 0x0020 /* found EOF */
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#define __SERR 0x0040 /* found error */
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#define __SMBF 0x0080 /* _buf is from malloc */
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#define __SAPP 0x0100 /* fdopen()ed in append mode */
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#define __SSTR 0x0200 /* this is an sprintf/snprintf string */
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#define __SOPT 0x0400 /* do fseek() optimization */
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#define __SNPT 0x0800 /* do not do fseek() optimization */
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#define __SOFF 0x1000 /* set iff _offset is in fact correct */
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#define __SMOD 0x2000 /* true => fgetln modified _p text */
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#define __SALC 0x4000 /* allocate string space dynamically */
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#define __SIGN 0x8000 /* ignore this file in _fwalk */
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/*
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* The following three definitions are for ANSI C, which took them
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* from System V, which brilliantly took internal interface macros and
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* made them official arguments to setvbuf(), without renaming them.
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* Hence, these ugly _IOxxx names are *supposed* to appear in user code.
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*
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* Although numbered as their counterparts above, the implementation
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* does not rely on this.
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*/
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#define _IOFBF 0 /* setvbuf should set fully buffered */
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#define _IOLBF 1 /* setvbuf should set line buffered */
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#define _IONBF 2 /* setvbuf should set unbuffered */
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#define BUFSIZ 1024 /* size of buffer used by setbuf */
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#define EOF (-1)
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/*
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* FOPEN_MAX is a minimum maximum, and is the number of streams that
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* stdio can provide without attempting to allocate further resources
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* (which could fail). Do not use this for anything.
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*/
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#define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */
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#define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */
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/* System V/ANSI C; this is the wrong way to do this, do *not* use these. */
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#if __BSD_VISIBLE || __XPG_VISIBLE
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#define P_tmpdir "/tmp/"
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#endif
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#define L_tmpnam 1024 /* XXX must be == PATH_MAX */
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#define TMP_MAX 308915776
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/* Always ensure that these are consistent with <fcntl.h> and <unistd.h>! */
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#ifndef SEEK_SET
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#define SEEK_SET 0 /* set file offset to offset */
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#endif
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#ifndef SEEK_CUR
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#define SEEK_CUR 1 /* set file offset to current plus offset */
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#endif
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#ifndef SEEK_END
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#define SEEK_END 2 /* set file offset to EOF plus offset */
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#endif
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#define stdin (&__sF[0])
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#define stdout (&__sF[1])
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#define stderr (&__sF[2])
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/*
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* Functions defined in ANSI C standard.
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*/
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__BEGIN_DECLS
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void clearerr(FILE *);
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int fclose(FILE *);
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int feof(FILE *);
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int ferror(FILE *);
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int fflush(FILE *);
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int fgetc(FILE *);
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char *fgets(char * __restrict, int, FILE * __restrict);
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FILE *fopen(const char * __restrict , const char * __restrict);
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int fprintf(FILE * __restrict , const char * __restrict, ...)
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__printflike(2, 3);
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int fputc(int, FILE *);
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int fputs(const char * __restrict, FILE * __restrict);
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size_t fread(void * __restrict, size_t, size_t, FILE * __restrict);
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FILE *freopen(const char * __restrict, const char * __restrict,
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FILE * __restrict);
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int fscanf(FILE * __restrict, const char * __restrict, ...)
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__scanflike(2, 3);
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int fseek(FILE *, long, int);
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long ftell(FILE *);
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size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
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int getc(FILE *);
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int getchar(void);
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ssize_t getdelim(char ** __restrict, size_t * __restrict, int,
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FILE * __restrict);
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ssize_t getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
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void perror(const char *);
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int printf(const char * __restrict, ...)
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__printflike(1, 2);
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int putc(int, FILE *);
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int putchar(int);
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int puts(const char *);
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int remove(const char *);
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void rewind(FILE *);
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int scanf(const char * __restrict, ...)
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__scanflike(1, 2);
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void setbuf(FILE * __restrict, char * __restrict);
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int setvbuf(FILE * __restrict, char * __restrict, int, size_t);
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int sscanf(const char * __restrict, const char * __restrict, ...)
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__scanflike(2, 3);
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FILE *tmpfile(void);
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int ungetc(int, FILE *);
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int vfprintf(FILE * __restrict, const char * __restrict, __va_list)
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__printflike(2, 0);
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int vprintf(const char * __restrict, __va_list)
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__printflike(1, 0);
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int dprintf(int, const char * __restrict, ...) __printflike(2, 3);
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int vdprintf(int, const char * __restrict, __va_list) __printflike(2, 0);
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#ifndef __AUDIT__
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#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
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char* gets(char*) __warnattr("gets is very unsafe; consider using fgets");
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#endif
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int sprintf(char* __restrict, const char* __restrict, ...)
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__printflike(2, 3) __warnattr("sprintf is often misused; please use snprintf");
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char* tmpnam(char*) __warnattr("tmpnam possibly used unsafely; consider using mkstemp");
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int vsprintf(char* __restrict, const char* __restrict, __va_list)
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__printflike(2, 0) __warnattr("vsprintf is often misused; please use vsnprintf");
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#if __XPG_VISIBLE
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char* tempnam(const char*, const char*)
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__warnattr("tempnam possibly used unsafely; consider using mkstemp");
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#endif
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#endif
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extern int rename(const char*, const char*);
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extern int renameat(int, const char*, int, const char*);
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int fgetpos(FILE * __restrict, fpos_t * __restrict);
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int fsetpos(FILE *, const fpos_t *);
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int fseeko(FILE *, off_t, int);
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off_t ftello(FILE *);
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#if __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE
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int snprintf(char * __restrict, size_t, const char * __restrict, ...)
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__printflike(3, 4);
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int vfscanf(FILE * __restrict, const char * __restrict, __va_list)
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__scanflike(2, 0);
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int vscanf(const char *, __va_list)
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__scanflike(1, 0);
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int vsnprintf(char * __restrict, size_t, const char * __restrict, __va_list)
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__printflike(3, 0);
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int vsscanf(const char * __restrict, const char * __restrict, __va_list)
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__scanflike(2, 0);
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#endif /* __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE */
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__END_DECLS
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/*
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* Functions defined in POSIX 1003.1.
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*/
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#if __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE
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#define L_ctermid 1024 /* size for ctermid(); PATH_MAX */
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__BEGIN_DECLS
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FILE *fdopen(int, const char *);
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int fileno(FILE *);
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#if (__POSIX_VISIBLE >= 199209)
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int pclose(FILE *);
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FILE *popen(const char *, const char *);
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#endif
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#if __POSIX_VISIBLE >= 199506
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void flockfile(FILE *);
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int ftrylockfile(FILE *);
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void funlockfile(FILE *);
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/*
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* These are normally used through macros as defined below, but POSIX
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* requires functions as well.
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*/
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int getc_unlocked(FILE *);
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int getchar_unlocked(void);
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int putc_unlocked(int, FILE *);
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int putchar_unlocked(int);
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#endif /* __POSIX_VISIBLE >= 199506 */
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#if __POSIX_VISIBLE >= 200809
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FILE* fmemopen(void*, size_t, const char*);
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FILE* open_memstream(char**, size_t*);
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#endif /* __POSIX_VISIBLE >= 200809 */
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__END_DECLS
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#endif /* __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE */
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/*
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* Routines that are purely local.
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*/
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#if __BSD_VISIBLE
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__BEGIN_DECLS
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int asprintf(char ** __restrict, const char * __restrict, ...)
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__printflike(2, 3);
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char *fgetln(FILE * __restrict, size_t * __restrict);
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int fpurge(FILE *);
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void setbuffer(FILE *, char *, int);
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int setlinebuf(FILE *);
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int vasprintf(char ** __restrict, const char * __restrict,
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__va_list)
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__printflike(2, 0);
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void clearerr_unlocked(FILE*);
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int feof_unlocked(FILE*);
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int ferror_unlocked(FILE*);
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__END_DECLS
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/*
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* Stdio function-access interface.
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*/
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__BEGIN_DECLS
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FILE *funopen(const void *,
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int (*)(void *, char *, int),
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int (*)(void *, const char *, int),
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fpos_t (*)(void *, fpos_t, int),
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int (*)(void *));
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__END_DECLS
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#define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
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#define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
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#endif /* __BSD_VISIBLE */
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#if defined(__BIONIC_FORTIFY)
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__BEGIN_DECLS
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__BIONIC_FORTIFY_INLINE
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__printflike(3, 0)
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int vsnprintf(char *dest, size_t size, const char *format, __va_list ap)
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{
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return __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, ap);
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}
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__BIONIC_FORTIFY_INLINE
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__printflike(2, 0)
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int vsprintf(char *dest, const char *format, __va_list ap)
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{
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return __builtin___vsprintf_chk(dest, 0, __bos(dest), format, ap);
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}
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#if defined(__clang__)
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#if !defined(snprintf)
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#define __wrap_snprintf(dest, size, ...) __builtin___snprintf_chk(dest, size, 0, __bos(dest), __VA_ARGS__)
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#define snprintf(...) __wrap_snprintf(__VA_ARGS__)
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#endif
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#else
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__BIONIC_FORTIFY_INLINE
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__printflike(3, 4)
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int snprintf(char *dest, size_t size, const char *format, ...)
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{
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return __builtin___snprintf_chk(dest, size, 0,
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__bos(dest), format, __builtin_va_arg_pack());
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}
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#endif
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#if defined(__clang__)
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#if !defined(sprintf)
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#define __wrap_sprintf(dest, ...) __builtin___sprintf_chk(dest, 0, __bos(dest), __VA_ARGS__)
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#define sprintf(...) __wrap_sprintf(__VA_ARGS__)
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#endif
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#else
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__BIONIC_FORTIFY_INLINE
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__printflike(2, 3)
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int sprintf(char *dest, const char *format, ...)
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{
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return __builtin___sprintf_chk(dest, 0,
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__bos(dest), format, __builtin_va_arg_pack());
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}
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#endif
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extern char* __fgets_chk(char*, int, FILE*, size_t);
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extern char* __fgets_real(char*, int, FILE*) __RENAME(fgets);
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__errordecl(__fgets_too_big_error, "fgets called with size bigger than buffer");
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__errordecl(__fgets_too_small_error, "fgets called with size less than zero");
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#if !defined(__clang__)
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__BIONIC_FORTIFY_INLINE
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char *fgets(char* dest, int size, FILE* stream) {
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size_t bos = __bos(dest);
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// Compiler can prove, at compile time, that the passed in size
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// is always negative. Force a compiler error.
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if (__builtin_constant_p(size) && (size < 0)) {
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__fgets_too_small_error();
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}
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// Compiler doesn't know destination size. Don't call __fgets_chk
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if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
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return __fgets_real(dest, size, stream);
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}
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// Compiler can prove, at compile time, that the passed in size
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// is always <= the actual object size. Don't call __fgets_chk
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if (__builtin_constant_p(size) && (size <= (int) bos)) {
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return __fgets_real(dest, size, stream);
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}
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// Compiler can prove, at compile time, that the passed in size
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// is always > the actual object size. Force a compiler error.
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if (__builtin_constant_p(size) && (size > (int) bos)) {
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__fgets_too_big_error();
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}
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return __fgets_chk(dest, size, stream, bos);
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}
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#endif /* !defined(__clang__) */
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__END_DECLS
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#endif /* defined(__BIONIC_FORTIFY) */
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#endif /* _STDIO_H_ */
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