stdio.h revision 1.64
1 /* $NetBSD: stdio.h,v 1.64 2006/05/10 21:09:45 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)stdio.h 8.5 (Berkeley) 4/29/95 35 */ 36 37 #ifndef _STDIO_H_ 38 #define _STDIO_H_ 39 40 #include <sys/cdefs.h> 41 #include <sys/featuretest.h> 42 #include <sys/ansi.h> 43 44 #include <machine/ansi.h> 45 #ifdef _BSD_SIZE_T_ 46 typedef _BSD_SIZE_T_ size_t; 47 #undef _BSD_SIZE_T_ 48 #endif 49 50 #include <sys/null.h> 51 52 /* 53 * This is fairly grotesque, but pure ANSI code must not inspect the 54 * innards of an fpos_t anyway. The library internally uses off_t, 55 * which we assume is exactly as big as eight chars. 56 */ 57 #if (!defined(_ANSI_SOURCE) && !defined(__STRICT_ANSI__)) || defined(_LIBC) 58 typedef __off_t fpos_t; 59 #else 60 typedef struct __sfpos { 61 __off_t _pos; 62 } fpos_t; 63 #endif 64 65 #define _FSTDIO /* Define for new stdio with functions. */ 66 67 /* 68 * NB: to fit things in six character monocase externals, the stdio 69 * code uses the prefix `__s' for stdio objects, typically followed 70 * by a three-character attempt at a mnemonic. 71 */ 72 73 /* stdio buffers */ 74 struct __sbuf { 75 unsigned char *_base; 76 int _size; 77 }; 78 79 /* 80 * stdio state variables. 81 * 82 * The following always hold: 83 * 84 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 85 * _lbfsize is -_bf._size, else _lbfsize is 0 86 * if _flags&__SRD, _w is 0 87 * if _flags&__SWR, _r is 0 88 * 89 * This ensures that the getc and putc macros (or inline functions) never 90 * try to write or read from a file that is in `read' or `write' mode. 91 * (Moreover, they can, and do, automatically switch from read mode to 92 * write mode, and back, on "r+" and "w+" files.) 93 * 94 * _lbfsize is used only to make the inline line-buffered output stream 95 * code as compact as possible. 96 * 97 * _ub, _up, and _ur are used when ungetc() pushes back more characters 98 * than fit in the current _bf, or when ungetc() pushes back a character 99 * that does not match the previous one in _bf. When this happens, 100 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 101 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 102 * 103 * NB: see WARNING above before changing the layout of this structure! 104 */ 105 typedef struct __sFILE { 106 unsigned char *_p; /* current position in (some) buffer */ 107 int _r; /* read space left for getc() */ 108 int _w; /* write space left for putc() */ 109 short _flags; /* flags, below; this FILE is free if 0 */ 110 short _file; /* fileno, if Unix descriptor, else -1 */ 111 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 112 int _lbfsize; /* 0 or -_bf._size, for inline putc */ 113 114 /* operations */ 115 void *_cookie; /* cookie passed to io functions */ 116 int (*_close)(void *); 117 int (*_read) (void *, char *, int); 118 fpos_t (*_seek) (void *, fpos_t, int); 119 int (*_write)(void *, const char *, int); 120 121 /* file extension */ 122 struct __sbuf _ext; 123 124 /* separate buffer for long sequences of ungetc() */ 125 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 126 int _ur; /* saved _r when _r is counting ungetc data */ 127 128 /* tricks to meet minimum requirements even when malloc() fails */ 129 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 130 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 131 132 /* separate buffer for fgetln() when line crosses buffer boundary */ 133 struct __sbuf _lb; /* buffer for fgetln() */ 134 135 /* Unix stdio files get aligned to block boundaries on fseek() */ 136 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 137 fpos_t _offset; /* current lseek offset */ 138 } FILE; 139 140 __BEGIN_DECLS 141 extern FILE __sF[]; 142 __END_DECLS 143 144 #define __SLBF 0x0001 /* line buffered */ 145 #define __SNBF 0x0002 /* unbuffered */ 146 #define __SRD 0x0004 /* OK to read */ 147 #define __SWR 0x0008 /* OK to write */ 148 /* RD and WR are never simultaneously asserted */ 149 #define __SRW 0x0010 /* open for reading & writing */ 150 #define __SEOF 0x0020 /* found EOF */ 151 #define __SERR 0x0040 /* found error */ 152 #define __SMBF 0x0080 /* _buf is from malloc */ 153 #define __SAPP 0x0100 /* fdopen()ed in append mode */ 154 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */ 155 #define __SOPT 0x0400 /* do fseek() optimization */ 156 #define __SNPT 0x0800 /* do not do fseek() optimization */ 157 #define __SOFF 0x1000 /* set iff _offset is in fact correct */ 158 #define __SMOD 0x2000 /* true => fgetln modified _p text */ 159 #define __SALC 0x4000 /* allocate string space dynamically */ 160 161 /* 162 * The following three definitions are for ANSI C, which took them 163 * from System V, which brilliantly took internal interface macros and 164 * made them official arguments to setvbuf(), without renaming them. 165 * Hence, these ugly _IOxxx names are *supposed* to appear in user code. 166 * 167 * Although numbered as their counterparts above, the implementation 168 * does not rely on this. 169 */ 170 #define _IOFBF 0 /* setvbuf should set fully buffered */ 171 #define _IOLBF 1 /* setvbuf should set line buffered */ 172 #define _IONBF 2 /* setvbuf should set unbuffered */ 173 174 #define BUFSIZ 1024 /* size of buffer used by setbuf */ 175 #define EOF (-1) 176 177 /* 178 * FOPEN_MAX is a minimum maximum, and is the number of streams that 179 * stdio can provide without attempting to allocate further resources 180 * (which could fail). Do not use this for anything. 181 */ 182 /* must be == _POSIX_STREAM_MAX <limits.h> */ 183 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */ 184 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */ 185 186 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */ 187 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) 188 #define P_tmpdir "/var/tmp/" 189 #endif 190 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 191 /* Always ensure that this is consistent with <limits.h> */ 192 #ifndef TMP_MAX 193 #define TMP_MAX 308915776 /* Legacy */ 194 #endif 195 196 /* Always ensure that these are consistent with <fcntl.h> and <unistd.h>! */ 197 #ifndef SEEK_SET 198 #define SEEK_SET 0 /* set file offset to offset */ 199 #endif 200 #ifndef SEEK_CUR 201 #define SEEK_CUR 1 /* set file offset to current plus offset */ 202 #endif 203 #ifndef SEEK_END 204 #define SEEK_END 2 /* set file offset to EOF plus offset */ 205 #endif 206 207 #define stdin (&__sF[0]) 208 #define stdout (&__sF[1]) 209 #define stderr (&__sF[2]) 210 211 /* 212 * Functions defined in ANSI C standard. 213 */ 214 __BEGIN_DECLS 215 void clearerr(FILE *); 216 int fclose(FILE *); 217 int feof(FILE *); 218 int ferror(FILE *); 219 int fflush(FILE *); 220 int fgetc(FILE *); 221 int fgetpos(FILE * __restrict, fpos_t * __restrict); 222 char *fgets(char * __restrict, int, FILE * __restrict); 223 FILE *fopen(const char * __restrict , const char * __restrict); 224 int fprintf(FILE * __restrict , const char * __restrict, ...); 225 int fputc(int, FILE *); 226 int fputs(const char * __restrict, FILE * __restrict); 227 size_t fread(void * __restrict, size_t, size_t, FILE * __restrict); 228 FILE *freopen(const char * __restrict, const char * __restrict, 229 FILE * __restrict); 230 int fscanf(FILE * __restrict, const char * __restrict, ...); 231 int fseek(FILE *, long, int); 232 int fsetpos(FILE *, const fpos_t *); 233 long ftell(FILE *); 234 size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict); 235 int getc(FILE *); 236 int getchar(void); 237 void perror(const char *); 238 int printf(const char * __restrict, ...); 239 int putc(int, FILE *); 240 int putchar(int); 241 int puts(const char *); 242 int remove(const char *); 243 void rewind(FILE *); 244 int scanf(const char * __restrict, ...); 245 void setbuf(FILE * __restrict, char * __restrict); 246 int setvbuf(FILE * __restrict, char * __restrict, int, size_t); 247 int sscanf(const char * __restrict, const char * __restrict, ...); 248 FILE *tmpfile(void); 249 int ungetc(int, FILE *); 250 int vfprintf(FILE * __restrict, const char * __restrict, _BSD_VA_LIST_); 251 int vprintf(const char * __restrict, _BSD_VA_LIST_); 252 253 #ifndef __AUDIT__ 254 char *gets(char *); 255 int sprintf(char * __restrict, const char * __restrict, ...); 256 char *tmpnam(char *); 257 int vsprintf(char * __restrict, const char * __restrict, 258 _BSD_VA_LIST_); 259 #endif 260 261 #if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) 262 int rename (const char *, const char *) __RENAME(__posix_rename); 263 #else 264 int rename (const char *, const char *); 265 #endif 266 __END_DECLS 267 268 /* 269 * IEEE Std 1003.1-90 270 */ 271 #if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \ 272 defined(_NETBSD_SOURCE) 273 #define L_ctermid 1024 /* size for ctermid(); PATH_MAX */ 274 #define L_cuserid 9 /* size for cuserid(); UT_NAMESIZE + 1 */ 275 276 __BEGIN_DECLS 277 char *ctermid(char *); 278 #ifndef __CUSERID_DECLARED 279 #define __CUSERID_DECLARED 280 /* also declared in unistd.h */ 281 char *cuserid(char *); 282 #endif /* __CUSERID_DECLARED */ 283 FILE *fdopen(int, const char *); 284 int fileno(FILE *); 285 __END_DECLS 286 #endif /* not ANSI */ 287 288 /* 289 * IEEE Std 1003.1c-95, also adopted by X/Open CAE Spec Issue 5 Version 2 290 */ 291 #if (_POSIX_C_SOURCE - 0) >= 199506L || (_XOPEN_SOURCE - 0) >= 500 || \ 292 defined(_REENTRANT) || defined(_NETBSD_SOURCE) 293 __BEGIN_DECLS 294 void flockfile(FILE *); 295 int ftrylockfile(FILE *); 296 void funlockfile(FILE *); 297 int getc_unlocked(FILE *); 298 int getchar_unlocked(void); 299 int putc_unlocked(int, FILE *); 300 int putchar_unlocked(int); 301 __END_DECLS 302 #endif /* _POSIX_C_SOURCE >= 1995056 || _XOPEN_SOURCE >= 500 || ... */ 303 304 /* 305 * Functions defined in POSIX 1003.2 and XPG2 or later. 306 */ 307 #if (_POSIX_C_SOURCE - 0) >= 2 || (_XOPEN_SOURCE - 0) >= 2 || \ 308 defined(_NETBSD_SOURCE) 309 __BEGIN_DECLS 310 int pclose(FILE *); 311 FILE *popen(const char *, const char *); 312 __END_DECLS 313 #endif 314 315 /* 316 * Functions defined in ISO XPG4.2, ISO C99, POSIX 1003.1-2001 or later. 317 */ 318 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \ 319 !defined(_XOPEN_SOURCE) || \ 320 ((__STDC_VERSION__ - 0) >= 199901L) || \ 321 ((_POSIX_C_SOURCE - 0) >= 200112L) || \ 322 (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) || \ 323 ((_XOPEN_SOURCE - 0) >= 500) || \ 324 defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE) 325 __BEGIN_DECLS 326 int snprintf(char * __restrict, size_t, const char * __restrict, ...) 327 __attribute__((__format__(__printf__, 3, 4))); 328 int vsnprintf(char * __restrict, size_t, const char * __restrict, 329 _BSD_VA_LIST_) 330 __attribute__((__format__(__printf__, 3, 0))); 331 __END_DECLS 332 #endif 333 334 /* 335 * Functions defined in XPG4.2. 336 */ 337 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) 338 __BEGIN_DECLS 339 int getw(FILE *); 340 int putw(int, FILE *); 341 342 #ifndef __AUDIT__ 343 char *tempnam(const char *, const char *); 344 #endif 345 __END_DECLS 346 #endif 347 348 /* 349 * X/Open CAE Specification Issue 5 Version 2 350 */ 351 #if (_XOPEN_SOURCE - 0) >= 500 || defined(_LARGEFILE_SOURCE) || \ 352 defined(_NETBSD_SOURCE) 353 #ifndef off_t 354 typedef __off_t off_t; 355 #define off_t __off_t 356 #endif /* off_t */ 357 358 __BEGIN_DECLS 359 int fseeko(FILE *, off_t, int); 360 off_t ftello(FILE *); 361 __END_DECLS 362 #endif /* _XOPEN_SOURCE >= 500 || _LARGEFILE_SOURCE || _NETBSD_SOURCE */ 363 364 /* 365 * Routines that are purely local. 366 */ 367 #if defined(_NETBSD_SOURCE) 368 369 #define FPARSELN_UNESCESC 0x01 370 #define FPARSELN_UNESCCONT 0x02 371 #define FPARSELN_UNESCCOMM 0x04 372 #define FPARSELN_UNESCREST 0x08 373 #define FPARSELN_UNESCALL 0x0f 374 375 __BEGIN_DECLS 376 int asprintf(char ** __restrict, const char * __restrict, ...) 377 __attribute__((__format__(__printf__, 2, 3))); 378 char *fgetln(FILE * __restrict, size_t * __restrict); 379 char *fparseln(FILE *, size_t *, size_t *, const char[3], int); 380 int fpurge(FILE *); 381 void setbuffer(FILE *, char *, int); 382 int setlinebuf(FILE *); 383 int vasprintf(char ** __restrict, const char * __restrict, 384 _BSD_VA_LIST_) 385 __attribute__((__format__(__printf__, 2, 0))); 386 int vscanf(const char * __restrict, _BSD_VA_LIST_) 387 __attribute__((__format__(__scanf__, 1, 0))); 388 int vfscanf(FILE * __restrict, const char * __restrict, 389 _BSD_VA_LIST_) 390 __attribute__((__format__(__scanf__, 2, 0))); 391 int vsscanf(const char * __restrict, const char * __restrict, 392 _BSD_VA_LIST_) 393 __attribute__((__format__(__scanf__, 2, 0))); 394 const char *fmtcheck(const char *, const char *) 395 __attribute__((__format_arg__(2))); 396 __END_DECLS 397 398 /* 399 * Stdio function-access interface. 400 */ 401 __BEGIN_DECLS 402 FILE *funopen(const void *, 403 int (*)(void *, char *, int), 404 int (*)(void *, const char *, int), 405 fpos_t (*)(void *, fpos_t, int), 406 int (*)(void *)); 407 __END_DECLS 408 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 409 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 410 #endif /* _NETBSD_SOURCE */ 411 412 /* 413 * Functions internal to the implementation. 414 */ 415 __BEGIN_DECLS 416 int __srget(FILE *); 417 int __swbuf(int, FILE *); 418 __END_DECLS 419 420 /* 421 * The __sfoo macros are here so that we can 422 * define function versions in the C library. 423 */ 424 #define __sgetc(p) (--(p)->_r < 0 ? __srget(p) : (int)(*(p)->_p++)) 425 #if defined(__GNUC__) && defined(__STDC__) 426 static __inline int __sputc(int _c, FILE *_p) { 427 if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != '\n')) 428 return (*_p->_p++ = _c); 429 else 430 return (__swbuf(_c, _p)); 431 } 432 #else 433 /* 434 * This has been tuned to generate reasonable code on the vax using pcc. 435 */ 436 #define __sputc(c, p) \ 437 (--(p)->_w < 0 ? \ 438 (p)->_w >= (p)->_lbfsize ? \ 439 (*(p)->_p = (c)), *(p)->_p != '\n' ? \ 440 (int)*(p)->_p++ : \ 441 __swbuf('\n', p) : \ 442 __swbuf((int)(c), p) : \ 443 (*(p)->_p = (c), (int)*(p)->_p++)) 444 #endif 445 446 #define __sfeof(p) (((p)->_flags & __SEOF) != 0) 447 #define __sferror(p) (((p)->_flags & __SERR) != 0) 448 #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF))) 449 #define __sfileno(p) ((p)->_file) 450 451 #ifndef __lint__ 452 #if !defined(_REENTRANT) && !defined(_PTHREADS) 453 #define feof(p) __sfeof(p) 454 #define ferror(p) __sferror(p) 455 #define clearerr(p) __sclearerr(p) 456 457 #define getc(fp) __sgetc(fp) 458 #define putc(x, fp) __sputc(x, fp) 459 #endif /* !_REENTRANT && !_PTHREADS */ 460 #endif /* __lint__ */ 461 462 #define getchar() getc(stdin) 463 #define putchar(x) putc(x, stdout) 464 465 #if defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \ 466 defined(_NETBSD_SOURCE) 467 #if !defined(_REENTRANT) && !defined(_PTHREADS) 468 #define fileno(p) __sfileno(p) 469 #endif /* !_REENTRANT && !_PTHREADS */ 470 #endif /* !_ANSI_SOURCE */ 471 472 #if (_POSIX_C_SOURCE - 0) >= 199506L || (_XOPEN_SOURCE - 0) >= 500 || \ 473 defined(_REENTRANT) || defined(_NETBSD_SOURCE) 474 #define getc_unlocked(fp) __sgetc(fp) 475 #define putc_unlocked(x, fp) __sputc(x, fp) 476 477 #define getchar_unlocked() getc_unlocked(stdin) 478 #define putchar_unlocked(x) putc_unlocked(x, stdout) 479 #endif /* _POSIX_C_SOURCE >= 199506 || _XOPEN_SOURCE >= 500 || _REENTRANT... */ 480 481 #endif /* _STDIO_H_ */ 482
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