/* $OpenBSD: _stdio.h,v 1.4 2025/08/08 15:58:53 yasuoka Exp $ */ /* $NetBSD: stdio.h,v 1.18 1996/04/25 18:29:21 jtc Exp $ */ /*- * Copyright (c) 1990 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. 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 5.17 (Berkeley) 6/3/91 */ #ifndef _LIBC__STDIO_H_ #define _LIBC__STDIO_H_ #include "thread_private.h" /* * 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. * XXX With this all strictly inside libc, the naming rules are no * XXX longer necessary. */ /* 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() or ungetwc() push back more * characters than fit in the current _bf, or when ungetc() or ungetwc() push * 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. */ struct __sFILE { int _flags; /* flags, below; this FILE is free if 0 */ int _file; /* fileno, if Unix descriptor, else -1 */ unsigned char *_p; /* current position in (some) buffer */ int _r; /* read space left for getc() */ int _w; /* write space left for putc() */ struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ int _lbfsize; /* 0 or -_bf._size, for inline putc */ struct __rcmtx _lock; /* operations */ void *_cookie; /* cookie passed to io functions */ int (*_close)(void *); int (*_read)(void *, char *, int); __off_t (*_seek)(void *, __off_t, int); int (*_write)(void *, const char *, int); struct __sbuf _ub; /* ungetc buffer */ /* data for long sequences of ungetc() */ 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) */ __off_t _offset; /* current lseek offset */ /* minimal requirement of SUSv2 */ /* XXX switch to (re)using _ub */ #define FILE_UNGETWC_BUFSIZE 1 __wchar_t _ungetwc_buf[FILE_UNGETWC_BUFSIZE]; size_t _ungetwc_inbuf; /* conversion state for wide-oriented streams */ /* XXX should only need one; clear when switching mode */ __mbstate_t _mbstate_in; __mbstate_t _mbstate_out; }; #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 */ #define __SALC 0x4000 /* allocate string space dynamically */ #define __SIGN 0x8000 /* ignore this file in _fwalk */ #define __SONW 0x10000 /* orientation set to narrow */ #define __SOWD 0x20000 /* orientation set to wide */ /* ONW and OWD are never simultaneously asserted */ __BEGIN_DECLS extern FILE __stdin[]; extern FILE __stdout[]; extern FILE __stderr[]; __END_DECLS #endif /* _LIBC__STDIO_H_ */
