1 /* $OpenBSD: stdio.h,v 1.35 2006/01/13 18:10:09 miod Exp $ */ 2 /* $NetBSD: stdio.h,v 1.18 1996/04/25 18:29:21 jtc Exp $ */ 3 4 /*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Chris Torek. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)stdio.h 5.17 (Berkeley) 6/3/91 36 */ 37 38 #ifndef _STDIO_H_ 39 #define _STDIO_H_ 40 41 #include <sys/cdefs.h> 42 #include <sys/types.h> 43 44 #include <stdarg.h> 45 #include <stddef.h> 46 47 #define __need_NULL 48 #include <stddef.h> 49 50 #define _FSTDIO /* Define for new stdio with functions. */ 51 52 typedef off_t fpos_t; /* stdio file position type */ 53 54 /* 55 * NB: to fit things in six character monocase externals, the stdio 56 * code uses the prefix `__s' for stdio objects, typically followed 57 * by a three-character attempt at a mnemonic. 58 */ 59 60 /* stdio buffers */ 61 struct __sbuf { 62 unsigned char *_base; 63 int _size; 64 }; 65 66 /* 67 * stdio state variables. 68 * 69 * The following always hold: 70 * 71 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 72 * _lbfsize is -_bf._size, else _lbfsize is 0 73 * if _flags&__SRD, _w is 0 74 * if _flags&__SWR, _r is 0 75 * 76 * This ensures that the getc and putc macros (or inline functions) never 77 * try to write or read from a file that is in `read' or `write' mode. 78 * (Moreover, they can, and do, automatically switch from read mode to 79 * write mode, and back, on "r+" and "w+" files.) 80 * 81 * _lbfsize is used only to make the inline line-buffered output stream 82 * code as compact as possible. 83 * 84 * _ub, _up, and _ur are used when ungetc() pushes back more characters 85 * than fit in the current _bf, or when ungetc() pushes back a character 86 * that does not match the previous one in _bf. When this happens, 87 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 88 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 89 * 90 * NOTE: if you change this structure, you also need to update the 91 * std() initializer in findfp.c. 92 */ 93 typedef struct __sFILE { 94 unsigned char *_p; /* current position in (some) buffer */ 95 int _r; /* read space left for getc() */ 96 int _w; /* write space left for putc() */ 97 short _flags; /* flags, below; this FILE is free if 0 */ 98 short _file; /* fileno, if Unix descriptor, else -1 */ 99 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 100 int _lbfsize; /* 0 or -_bf._size, for inline putc */ 101 102 /* operations */ 103 void *_cookie; /* cookie passed to io functions */ 104 int (*_close)(void *); 105 int (*_read)(void *, char *, int); 106 fpos_t (*_seek)(void *, fpos_t, int); 107 int (*_write)(void *, const char *, int); 108 109 /* extension data, to avoid further ABI breakage */ 110 struct __sbuf _ext; 111 /* data for long sequences of ungetc() */ 112 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 113 int _ur; /* saved _r when _r is counting ungetc data */ 114 115 /* tricks to meet minimum requirements even when malloc() fails */ 116 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 117 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 118 119 /* separate buffer for fgetln() when line crosses buffer boundary */ 120 struct __sbuf _lb; /* buffer for fgetln() */ 121 122 /* Unix stdio files get aligned to block boundaries on fseek() */ 123 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 124 fpos_t _offset; /* current lseek offset */ 125 } FILE; 126 127 __BEGIN_DECLS 128 extern FILE __sF[]; 129 __END_DECLS 130 131 #define __SLBF 0x0001 /* line buffered */ 132 #define __SNBF 0x0002 /* unbuffered */ 133 #define __SRD 0x0004 /* OK to read */ 134 #define __SWR 0x0008 /* OK to write */ 135 /* RD and WR are never simultaneously asserted */ 136 #define __SRW 0x0010 /* open for reading & writing */ 137 #define __SEOF 0x0020 /* found EOF */ 138 #define __SERR 0x0040 /* found error */ 139 #define __SMBF 0x0080 /* _buf is from malloc */ 140 #define __SAPP 0x0100 /* fdopen()ed in append mode */ 141 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */ 142 #define __SOPT 0x0400 /* do fseek() optimization */ 143 #define __SNPT 0x0800 /* do not do fseek() optimization */ 144 #define __SOFF 0x1000 /* set iff _offset is in fact correct */ 145 #define __SMOD 0x2000 /* true => fgetln modified _p text */ 146 #define __SALC 0x4000 /* allocate string space dynamically */ 147 #define __SIGN 0x8000 /* ignore this file in _fwalk */ 148 149 /* 150 * The following three definitions are for ANSI C, which took them 151 * from System V, which brilliantly took internal interface macros and 152 * made them official arguments to setvbuf(), without renaming them. 153 * Hence, these ugly _IOxxx names are *supposed* to appear in user code. 154 * 155 * Although numbered as their counterparts above, the implementation 156 * does not rely on this. 157 */ 158 #define _IOFBF 0 /* setvbuf should set fully buffered */ 159 #define _IOLBF 1 /* setvbuf should set line buffered */ 160 #define _IONBF 2 /* setvbuf should set unbuffered */ 161 162 #define BUFSIZ 1024 /* size of buffer used by setbuf */ 163 #define EOF (-1) 164 165 /* 166 * FOPEN_MAX is a minimum maximum, and is the number of streams that 167 * stdio can provide without attempting to allocate further resources 168 * (which could fail). Do not use this for anything. 169 */ 170 171 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */ 172 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */ 173 174 /* System V/ANSI C; this is the wrong way to do this, do *not* use these. */ 175 #if __BSD_VISIBLE || __XPG_VISIBLE 176 #define P_tmpdir "/tmp/" 177 #endif 178 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 179 #define TMP_MAX 308915776 180 181 /* Always ensure that these are consistent with <fcntl.h> and <unistd.h>! */ 182 #ifndef SEEK_SET 183 #define SEEK_SET 0 /* set file offset to offset */ 184 #endif 185 #ifndef SEEK_CUR 186 #define SEEK_CUR 1 /* set file offset to current plus offset */ 187 #endif 188 #ifndef SEEK_END 189 #define SEEK_END 2 /* set file offset to EOF plus offset */ 190 #endif 191 192 #define stdin (&__sF[0]) 193 #define stdout (&__sF[1]) 194 #define stderr (&__sF[2]) 195 196 /* 197 * Functions defined in ANSI C standard. 198 */ 199 __BEGIN_DECLS 200 void clearerr(FILE *); 201 int fclose(FILE *); 202 int feof(FILE *); 203 int ferror(FILE *); 204 int fflush(FILE *); 205 int fgetc(FILE *); 206 char *fgets(char * __restrict, int, FILE * __restrict); 207 FILE *fopen(const char * __restrict , const char * __restrict); 208 int fprintf(FILE * __restrict , const char * __restrict, ...) 209 __printflike(2, 3); 210 int fputc(int, FILE *); 211 int fputs(const char * __restrict, FILE * __restrict); 212 size_t fread(void * __restrict, size_t, size_t, FILE * __restrict); 213 FILE *freopen(const char * __restrict, const char * __restrict, 214 FILE * __restrict); 215 int fscanf(FILE * __restrict, const char * __restrict, ...) 216 __scanflike(2, 3); 217 int fseek(FILE *, long, int); 218 long ftell(FILE *); 219 size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict); 220 int getc(FILE *); 221 int getchar(void); 222 ssize_t getdelim(char ** __restrict, size_t * __restrict, int, 223 FILE * __restrict); 224 ssize_t getline(char ** __restrict, size_t * __restrict, FILE * __restrict); 225 226 #if __BSD_VISIBLE && !defined(__SYS_ERRLIST) 227 #define __SYS_ERRLIST 228 extern int sys_nerr; /* perror(3) external variables */ 229 extern char *sys_errlist[]; 230 #endif 231 232 void perror(const char *); 233 int printf(const char * __restrict, ...) 234 __printflike(1, 2); 235 int putc(int, FILE *); 236 int putchar(int); 237 int puts(const char *); 238 int remove(const char *); 239 void rewind(FILE *); 240 int scanf(const char * __restrict, ...) 241 __scanflike(1, 2); 242 void setbuf(FILE * __restrict, char * __restrict); 243 int setvbuf(FILE * __restrict, char * __restrict, int, size_t); 244 int sscanf(const char * __restrict, const char * __restrict, ...) 245 __scanflike(2, 3); 246 FILE *tmpfile(void); 247 int ungetc(int, FILE *); 248 int vfprintf(FILE * __restrict, const char * __restrict, __va_list) 249 __printflike(2, 0); 250 int vprintf(const char * __restrict, __va_list) 251 __printflike(1, 0); 252 253 int dprintf(int, const char * __restrict, ...) __printflike(2, 3); 254 int vdprintf(int, const char * __restrict, __va_list) __printflike(2, 0); 255 256 #ifndef __AUDIT__ 257 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L 258 char* gets(char*) __warnattr("gets is very unsafe; consider using fgets"); 259 #endif 260 int sprintf(char* __restrict, const char* __restrict, ...) 261 __printflike(2, 3); //__warnattr("sprintf is often misused; please use snprintf"); 262 char* tmpnam(char*) __warnattr("tmpnam possibly used unsafely; consider using mkstemp"); 263 int vsprintf(char* __restrict, const char* __restrict, __va_list) 264 __printflike(2, 0); //__warnattr("vsprintf is often misused; please use vsnprintf"); 265 #if __XPG_VISIBLE 266 char* tempnam(const char*, const char*) 267 __warnattr("tempnam possibly used unsafely; consider using mkstemp"); 268 #endif 269 #endif 270 271 extern int rename(const char*, const char*); 272 extern int renameat(int, const char*, int, const char*); 273 274 int fgetpos(FILE * __restrict, fpos_t * __restrict); 275 int fsetpos(FILE *, const fpos_t *); 276 277 int fseeko(FILE *, off_t, int); 278 off_t ftello(FILE *); 279 280 #if __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE 281 int snprintf(char * __restrict, size_t, const char * __restrict, ...) 282 __printflike(3, 4); 283 int vfscanf(FILE * __restrict, const char * __restrict, __va_list) 284 __scanflike(2, 0); 285 int vscanf(const char *, __va_list) 286 __scanflike(1, 0); 287 int vsnprintf(char * __restrict, size_t, const char * __restrict, __va_list) 288 __printflike(3, 0); 289 int vsscanf(const char * __restrict, const char * __restrict, __va_list) 290 __scanflike(2, 0); 291 #endif /* __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE */ 292 293 __END_DECLS 294 295 296 /* 297 * Functions defined in POSIX 1003.1. 298 */ 299 #if __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE 300 #define L_ctermid 1024 /* size for ctermid(); PATH_MAX */ 301 302 __BEGIN_DECLS 303 #if 0 /* MISSING FROM BIONIC */ 304 char *ctermid(char *); 305 #endif /* MISSING */ 306 FILE *fdopen(int, const char *); 307 int fileno(FILE *); 308 309 #if (__POSIX_VISIBLE >= 199209) 310 int pclose(FILE *); 311 FILE *popen(const char *, const char *); 312 #endif 313 314 #if __POSIX_VISIBLE >= 199506 315 void flockfile(FILE *); 316 int ftrylockfile(FILE *); 317 void funlockfile(FILE *); 318 319 /* 320 * These are normally used through macros as defined below, but POSIX 321 * requires functions as well. 322 */ 323 int getc_unlocked(FILE *); 324 int getchar_unlocked(void); 325 int putc_unlocked(int, FILE *); 326 int putchar_unlocked(int); 327 #endif /* __POSIX_VISIBLE >= 199506 */ 328 329 __END_DECLS 330 331 #endif /* __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE */ 332 333 /* 334 * Routines that are purely local. 335 */ 336 #if __BSD_VISIBLE 337 __BEGIN_DECLS 338 int asprintf(char ** __restrict, const char * __restrict, ...) 339 __printflike(2, 3); 340 char *fgetln(FILE * __restrict, size_t * __restrict); 341 int fpurge(FILE *); 342 void setbuffer(FILE *, char *, int); 343 int setlinebuf(FILE *); 344 int vasprintf(char ** __restrict, const char * __restrict, 345 __va_list) 346 __printflike(2, 0); 347 __END_DECLS 348 349 /* 350 * Stdio function-access interface. 351 */ 352 __BEGIN_DECLS 353 FILE *funopen(const void *, 354 int (*)(void *, char *, int), 355 int (*)(void *, const char *, int), 356 fpos_t (*)(void *, fpos_t, int), 357 int (*)(void *)); 358 __END_DECLS 359 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 360 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 361 #endif /* __BSD_VISIBLE */ 362 363 #if defined(__BIONIC_FORTIFY) 364 365 __BEGIN_DECLS 366 367 __BIONIC_FORTIFY_INLINE 368 __printflike(3, 0) 369 int vsnprintf(char *dest, size_t size, const char *format, __va_list ap) 370 { 371 return __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, ap); 372 } 373 374 __BIONIC_FORTIFY_INLINE 375 __printflike(2, 0) 376 int vsprintf(char *dest, const char *format, __va_list ap) 377 { 378 return __builtin___vsprintf_chk(dest, 0, __bos(dest), format, ap); 379 } 380 381 #if defined(__clang__) 382 #if !defined(snprintf) 383 #define __wrap_snprintf(dest, size, ...) __builtin___snprintf_chk(dest, size, 0, __bos(dest), __VA_ARGS__) 384 #define snprintf(...) __wrap_snprintf(__VA_ARGS__) 385 #endif 386 #else 387 __BIONIC_FORTIFY_INLINE 388 __printflike(3, 4) 389 int snprintf(char *dest, size_t size, const char *format, ...) 390 { 391 return __builtin___snprintf_chk(dest, size, 0, 392 __bos(dest), format, __builtin_va_arg_pack()); 393 } 394 #endif 395 396 #if defined(__clang__) 397 #if !defined(sprintf) 398 #define __wrap_sprintf(dest, ...) __builtin___sprintf_chk(dest, 0, __bos(dest), __VA_ARGS__) 399 #define sprintf(...) __wrap_sprintf(__VA_ARGS__) 400 #endif 401 #else 402 __BIONIC_FORTIFY_INLINE 403 __printflike(2, 3) 404 int sprintf(char *dest, const char *format, ...) 405 { 406 return __builtin___sprintf_chk(dest, 0, 407 __bos(dest), format, __builtin_va_arg_pack()); 408 } 409 #endif 410 411 extern char* __fgets_chk(char*, int, FILE*, size_t); 412 extern char* __fgets_real(char*, int, FILE*) __asm__(__USER_LABEL_PREFIX__ "fgets"); 413 __errordecl(__fgets_too_big_error, "fgets called with size bigger than buffer"); 414 __errordecl(__fgets_too_small_error, "fgets called with size less than zero"); 415 416 #if !defined(__clang__) 417 418 __BIONIC_FORTIFY_INLINE 419 char *fgets(char* dest, int size, FILE* stream) { 420 size_t bos = __bos(dest); 421 422 // Compiler can prove, at compile time, that the passed in size 423 // is always negative. Force a compiler error. 424 if (__builtin_constant_p(size) && (size < 0)) { 425 __fgets_too_small_error(); 426 } 427 428 // Compiler doesn't know destination size. Don't call __fgets_chk 429 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 430 return __fgets_real(dest, size, stream); 431 } 432 433 // Compiler can prove, at compile time, that the passed in size 434 // is always <= the actual object size. Don't call __fgets_chk 435 if (__builtin_constant_p(size) && (size <= (int) bos)) { 436 return __fgets_real(dest, size, stream); 437 } 438 439 // Compiler can prove, at compile time, that the passed in size 440 // is always > the actual object size. Force a compiler error. 441 if (__builtin_constant_p(size) && (size > (int) bos)) { 442 __fgets_too_big_error(); 443 } 444 445 return __fgets_chk(dest, size, stream, bos); 446 } 447 448 #endif /* !defined(__clang__) */ 449 450 __END_DECLS 451 452 #endif /* defined(__BIONIC_FORTIFY) */ 453 454 #endif /* _STDIO_H_ */ 455
