stdio.h revision 1.4
1/* $NetBSD: stdio.h,v 1.18 1996/04/25 18:29:21 jtc Exp $ */ 2 3/*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Chris Torek. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)stdio.h 5.17 (Berkeley) 6/3/91 39 */ 40 41#ifndef _STDIO_H_ 42#define _STDIO_H_ 43 44#if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__) 45#include <sys/types.h> 46#endif 47 48#include <sys/cdefs.h> 49 50#include <machine/ansi.h> 51#ifdef _BSD_SIZE_T_ 52typedef _BSD_SIZE_T_ size_t; 53#undef _BSD_SIZE_T_ 54#endif 55 56#ifndef NULL 57#define NULL 0 58#endif 59 60/* 61 * This is fairly grotesque, but pure ANSI code must not inspect the 62 * innards of an fpos_t anyway. The library internally uses off_t, 63 * which we assume is exactly as big as eight chars. 64 */ 65#if !defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__) 66typedef off_t fpos_t; 67#else 68typedef struct __sfpos { 69 /* LONGLONG */ 70 long long _pos; /* XXX must be the same as off_t */ 71} fpos_t; 72#endif 73 74#define _FSTDIO /* Define for new stdio with functions. */ 75 76/* 77 * NB: to fit things in six character monocase externals, the stdio 78 * code uses the prefix `__s' for stdio objects, typically followed 79 * by a three-character attempt at a mnemonic. 80 */ 81 82/* stdio buffers */ 83struct __sbuf { 84 unsigned char *_base; 85 int _size; 86}; 87 88/* 89 * stdio state variables. 90 * 91 * The following always hold: 92 * 93 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 94 * _lbfsize is -_bf._size, else _lbfsize is 0 95 * if _flags&__SRD, _w is 0 96 * if _flags&__SWR, _r is 0 97 * 98 * This ensures that the getc and putc macros (or inline functions) never 99 * try to write or read from a file that is in `read' or `write' mode. 100 * (Moreover, they can, and do, automatically switch from read mode to 101 * write mode, and back, on "r+" and "w+" files.) 102 * 103 * _lbfsize is used only to make the inline line-buffered output stream 104 * code as compact as possible. 105 * 106 * _ub, _up, and _ur are used when ungetc() pushes back more characters 107 * than fit in the current _bf, or when ungetc() pushes back a character 108 * that does not match the previous one in _bf. When this happens, 109 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 110 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 111 */ 112typedef struct __sFILE { 113 unsigned char *_p; /* current position in (some) buffer */ 114 int _r; /* read space left for getc() */ 115 int _w; /* write space left for putc() */ 116 short _flags; /* flags, below; this FILE is free if 0 */ 117 short _file; /* fileno, if Unix descriptor, else -1 */ 118 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 119 int _lbfsize; /* 0 or -_bf._size, for inline putc */ 120 121 /* operations */ 122 void *_cookie; /* cookie passed to io functions */ 123 int (*_close) __P((void *)); 124 int (*_read) __P((void *, char *, int)); 125 fpos_t (*_seek) __P((void *, fpos_t, int)); 126 int (*_write) __P((void *, const char *, int)); 127 128 /* separate buffer for long sequences of ungetc() */ 129 struct __sbuf _ub; /* ungetc buffer */ 130 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 131 int _ur; /* saved _r when _r is counting ungetc data */ 132 133 /* tricks to meet minimum requirements even when malloc() fails */ 134 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 135 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 136 137 /* separate buffer for fgetln() when line crosses buffer boundary */ 138 struct __sbuf _lb; /* buffer for fgetln() */ 139 140 /* Unix stdio files get aligned to block boundaries on fseek() */ 141 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 142 fpos_t _offset; /* current lseek offset */ 143} FILE; 144 145__BEGIN_DECLS 146extern FILE __sF[]; 147__END_DECLS 148 149#define __SLBF 0x0001 /* line buffered */ 150#define __SNBF 0x0002 /* unbuffered */ 151#define __SRD 0x0004 /* OK to read */ 152#define __SWR 0x0008 /* OK to write */ 153 /* RD and WR are never simultaneously asserted */ 154#define __SRW 0x0010 /* open for reading & writing */ 155#define __SEOF 0x0020 /* found EOF */ 156#define __SERR 0x0040 /* found error */ 157#define __SMBF 0x0080 /* _buf is from malloc */ 158#define __SAPP 0x0100 /* fdopen()ed in append mode */ 159#define __SSTR 0x0200 /* this is an sprintf/snprintf string */ 160#define __SOPT 0x0400 /* do fseek() optimisation */ 161#define __SNPT 0x0800 /* do not do fseek() optimisation */ 162#define __SOFF 0x1000 /* set iff _offset is in fact correct */ 163#define __SMOD 0x2000 /* true => fgetln modified _p text */ 164 165/* 166 * The following three definitions are for ANSI C, which took them 167 * from System V, which brilliantly took internal interface macros and 168 * made them official arguments to setvbuf(), without renaming them. 169 * Hence, these ugly _IOxxx names are *supposed* to appear in user code. 170 * 171 * Although numbered as their counterparts above, the implementation 172 * does not rely on this. 173 */ 174#define _IOFBF 0 /* setvbuf should set fully buffered */ 175#define _IOLBF 1 /* setvbuf should set line buffered */ 176#define _IONBF 2 /* setvbuf should set unbuffered */ 177 178#define BUFSIZ 1024 /* size of buffer used by setbuf */ 179#define EOF (-1) 180 181/* 182 * FOPEN_MAX is a minimum maximum, and should be the number of descriptors 183 * that the kernel can provide without allocation of a resource that can 184 * fail without the process sleeping. Do not use this for anything. 185 */ 186#define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */ 187#define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */ 188 189/* System V/ANSI C; this is the wrong way to do this, do *not* use these. */ 190#ifndef _ANSI_SOURCE 191#define P_tmpdir "/var/tmp/" 192#endif 193#define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 194#define TMP_MAX 308915776 195 196#ifndef SEEK_SET 197#define SEEK_SET 0 /* set file offset to offset */ 198#endif 199#ifndef SEEK_CUR 200#define SEEK_CUR 1 /* set file offset to current plus offset */ 201#endif 202#ifndef SEEK_END 203#define SEEK_END 2 /* set file offset to EOF plus offset */ 204#endif 205 206#define stdin (&__sF[0]) 207#define stdout (&__sF[1]) 208#define stderr (&__sF[2]) 209 210/* 211 * Functions defined in ANSI C standard. 212 */ 213__BEGIN_DECLS 214void clearerr __P((FILE *)); 215int fclose __P((FILE *)); 216int feof __P((FILE *)); 217int ferror __P((FILE *)); 218int fflush __P((FILE *)); 219int fgetc __P((FILE *)); 220int fgetpos __P((FILE *, fpos_t *)); 221char *fgets __P((char *, int, FILE *)); 222FILE *fopen __P((const char *, const char *)); 223int fprintf __P((FILE *, const char *, ...)); 224int fputc __P((int, FILE *)); 225int fputs __P((const char *, FILE *)); 226size_t fread __P((void *, size_t, size_t, FILE *)); 227FILE *freopen __P((const char *, const char *, FILE *)); 228int fscanf __P((FILE *, const char *, ...)); 229int fseek __P((FILE *, long, int)); 230int fsetpos __P((FILE *, const fpos_t *)); 231long ftell __P((FILE *)); 232size_t fwrite __P((const void *, size_t, size_t, FILE *)); 233int getc __P((FILE *)); 234int getchar __P((void)); 235char *gets __P((char *)); 236void perror __P((const char *)); 237int printf __P((const char *, ...)); 238int putc __P((int, FILE *)); 239int putchar __P((int)); 240int puts __P((const char *)); 241int remove __P((const char *)); 242int rename __P((const char *, const char *)); 243void rewind __P((FILE *)); 244int scanf __P((const char *, ...)); 245void setbuf __P((FILE *, char *)); 246int setvbuf __P((FILE *, char *, int, size_t)); 247int sprintf __P((char *, const char *, ...)); 248int sscanf __P((const char *, const char *, ...)); 249FILE *tmpfile __P((void)); 250char *tmpnam __P((char *)); 251int ungetc __P((int, FILE *)); 252int vfprintf __P((FILE *, const char *, _BSD_VA_LIST_)); 253int vprintf __P((const char *, _BSD_VA_LIST_)); 254int vsprintf __P((char *, const char *, _BSD_VA_LIST_)); 255__END_DECLS 256 257/* 258 * Functions defined in POSIX 1003.1. 259 */ 260#ifndef _ANSI_SOURCE 261#define L_ctermid 1024 /* size for ctermid(); PATH_MAX */ 262#define L_cuserid 9 /* size for cuserid(); UT_NAMESIZE + 1 */ 263 264__BEGIN_DECLS 265char *ctermid __P((char *)); 266char *cuserid __P((char *)); 267FILE *fdopen __P((int, const char *)); 268int fileno __P((FILE *)); 269__END_DECLS 270#endif /* not ANSI */ 271 272/* 273 * Routines that are purely local. 274 */ 275#if !defined (_ANSI_SOURCE) && !defined(_POSIX_SOURCE) 276__BEGIN_DECLS 277char *fgetln __P((FILE *, size_t *)); 278int fpurge __P((FILE *)); 279int getw __P((FILE *)); 280int pclose __P((FILE *)); 281FILE *popen __P((const char *, const char *)); 282int putw __P((int, FILE *)); 283void setbuffer __P((FILE *, char *, int)); 284int setlinebuf __P((FILE *)); 285char *tempnam __P((const char *, const char *)); 286int snprintf __P((char *, size_t, const char *, ...)) 287 __attribute__((format (printf, 3, 4))); 288int vsnprintf __P((char *, size_t, const char *, _BSD_VA_LIST_)) 289 __attribute__((format (printf, 3, 0))); 290int vscanf __P((const char *, _BSD_VA_LIST_)) 291 __attribute__((format (scanf, 1, 0))); 292int vsscanf __P((const char *, const char *, _BSD_VA_LIST_)) 293 __attribute__((format (scanf, 2, 0))); 294__END_DECLS 295 296/* 297 * This is a #define because the function is used internally and 298 * (unlike vfscanf) the name __svfscanf is guaranteed not to collide 299 * with a user function when _ANSI_SOURCE or _POSIX_SOURCE is defined. 300 */ 301#define vfscanf __svfscanf 302 303/* 304 * Stdio function-access interface. 305 */ 306__BEGIN_DECLS 307FILE *funopen __P((const void *, 308 int (*)(void *, char *, int), 309 int (*)(void *, const char *, int), 310 fpos_t (*)(void *, fpos_t, int), 311 int (*)(void *))); 312__END_DECLS 313#define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 314#define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 315#endif /* !_ANSI_SOURCE && !_POSIX_SOURCE */ 316 317/* 318 * Functions internal to the implementation. 319 */ 320__BEGIN_DECLS 321int __srget __P((FILE *)); 322int __svfscanf __P((FILE *, const char *, _BSD_VA_LIST_)); 323int __swbuf __P((int, FILE *)); 324__END_DECLS 325 326/* 327 * The __sfoo macros are here so that we can 328 * define function versions in the C library. 329 */ 330#define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++)) 331#if defined(__GNUC__) && defined(__STDC__) 332static __inline int __sputc(int _c, FILE *_p) { 333 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n')) 334 return (*_p->_p++ = _c); 335 else 336 return (__swbuf(_c, _p)); 337} 338#else 339/* 340 * This has been tuned to generate reasonable code on the vax using pcc. 341 */ 342#define __sputc(c, p) \ 343 (--(p)->_w < 0 ? \ 344 (p)->_w >= (p)->_lbfsize ? \ 345 (*(p)->_p = (c)), *(p)->_p != '\n' ? \ 346 (int)*(p)->_p++ : \ 347 __swbuf('\n', p) : \ 348 __swbuf((int)(c), p) : \ 349 (*(p)->_p = (c), (int)*(p)->_p++)) 350#endif 351 352#define __sfeof(p) (((p)->_flags & __SEOF) != 0) 353#define __sferror(p) (((p)->_flags & __SERR) != 0) 354#define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF))) 355#define __sfileno(p) ((p)->_file) 356 357#define feof(p) __sfeof(p) 358#define ferror(p) __sferror(p) 359#define clearerr(p) __sclearerr(p) 360 361#ifndef _ANSI_SOURCE 362#define fileno(p) __sfileno(p) 363#endif 364 365#ifndef lint 366#define getc(fp) __sgetc(fp) 367#define putc(x, fp) __sputc(x, fp) 368#endif /* lint */ 369 370#define getchar() getc(stdin) 371#define putchar(x) putc(x, stdout) 372#endif /* _STDIO_H_ */ 373