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 #include <bits/seek_constants.h> 51 52 #if __ANDROID_API__ < __ANDROID_API_N__ 53 #include <bits/struct_file.h> 54 #endif 55 56 __BEGIN_DECLS 57 58 #if defined(__clang__) 59 #pragma clang diagnostic push 60 #pragma clang diagnostic ignored "-Wnullability-completeness" 61 #endif 62 63 typedef off_t fpos_t; 64 typedef off64_t fpos64_t; 65 66 struct __sFILE; 67 typedef struct __sFILE FILE; 68 69 #if __ANDROID_API__ >= __ANDROID_API_M__ 70 extern FILE* stdin __INTRODUCED_IN(23); 71 extern FILE* stdout __INTRODUCED_IN(23); 72 extern FILE* stderr __INTRODUCED_IN(23); 73 74 /* C99 and earlier plus current C++ standards say these must be macros. */ 75 #define stdin stdin 76 #define stdout stdout 77 #define stderr stderr 78 #else 79 /* Before M the actual symbols for stdin and friends had different names. */ 80 extern FILE __sF[] __REMOVED_IN(23); 81 82 #define stdin (&__sF[0]) 83 #define stdout (&__sF[1]) 84 #define stderr (&__sF[2]) 85 #endif 86 87 /* 88 * The following three definitions are for ANSI C, which took them 89 * from System V, which brilliantly took internal interface macros and 90 * made them official arguments to setvbuf(), without renaming them. 91 * Hence, these ugly _IOxxx names are *supposed* to appear in user code. 92 * 93 * Although numbered as their counterparts above, the implementation 94 * does not rely on this. 95 */ 96 #define _IOFBF 0 /* setvbuf should set fully buffered */ 97 #define _IOLBF 1 /* setvbuf should set line buffered */ 98 #define _IONBF 2 /* setvbuf should set unbuffered */ 99 100 #define BUFSIZ 1024 /* size of buffer used by setbuf */ 101 #define EOF (-1) 102 103 /* 104 * FOPEN_MAX is a minimum maximum, and is the number of streams that 105 * stdio can provide without attempting to allocate further resources 106 * (which could fail). Do not use this for anything. 107 */ 108 109 #define FOPEN_MAX 20 /* must be <= OPEN_MAX <sys/syslimits.h> */ 110 #define FILENAME_MAX 1024 /* must be <= PATH_MAX <sys/syslimits.h> */ 111 112 #define L_tmpnam 1024 /* XXX must be == PATH_MAX */ 113 #define TMP_MAX 308915776 114 115 /* 116 * Functions defined in ANSI C standard. 117 */ 118 void clearerr(FILE *); 119 int fclose(FILE *); 120 int feof(FILE *); 121 int ferror(FILE *); 122 int fflush(FILE *); 123 int fgetc(FILE *); 124 char *fgets(char * __restrict, int, FILE * __restrict) __overloadable 125 __RENAME_CLANG(fgets); 126 int fprintf(FILE * __restrict , const char * __restrict _Nonnull, ...) __printflike(2, 3); 127 int fputc(int, FILE *); 128 int fputs(const char * __restrict, FILE * __restrict); 129 size_t fread(void * __restrict, size_t, size_t, FILE * __restrict) 130 __overloadable __RENAME_CLANG(fread); 131 int fscanf(FILE * __restrict, const char * __restrict _Nonnull, ...) __scanflike(2, 3); 132 size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict) 133 __overloadable __RENAME_CLANG(fwrite); 134 int getc(FILE *); 135 int getchar(void); 136 ssize_t getdelim(char** __restrict, size_t* __restrict, int, FILE* __restrict) __INTRODUCED_IN(18); 137 ssize_t getline(char** __restrict, size_t* __restrict, FILE* __restrict) __INTRODUCED_IN(18); 138 139 void perror(const char *); 140 int printf(const char * __restrict _Nonnull, ...) __printflike(1, 2); 141 int putc(int, FILE *); 142 int putchar(int); 143 int puts(const char *); 144 int remove(const char *); 145 void rewind(FILE *); 146 int scanf(const char * __restrict _Nonnull, ...) __scanflike(1, 2); 147 void setbuf(FILE * __restrict, char * __restrict); 148 int setvbuf(FILE * __restrict, char * __restrict, int, size_t); 149 int sscanf(const char * __restrict, const char * __restrict _Nonnull, ...) __scanflike(2, 3); 150 int ungetc(int, FILE *); 151 int vfprintf(FILE * __restrict, const char * __restrict _Nonnull, __va_list) __printflike(2, 0); 152 int vprintf(const char * __restrict _Nonnull, __va_list) __printflike(1, 0); 153 154 int dprintf(int, const char* __restrict _Nonnull, ...) __printflike(2, 3) __INTRODUCED_IN(21); 155 int vdprintf(int, const char* __restrict _Nonnull, __va_list) __printflike(2, 0) __INTRODUCED_IN(21); 156 157 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ < 201112L) || \ 158 (defined(__cplusplus) && __cplusplus <= 201103L) 159 char* gets(char*) __attribute__((deprecated("gets is unsafe, use fgets instead"))); 160 #endif 161 int sprintf(char* __restrict, const char* __restrict _Nonnull, ...) 162 __printflike(2, 3) __warnattr_strict("sprintf is often misused; please use snprintf") 163 __overloadable __RENAME_CLANG(sprintf); 164 int vsprintf(char* __restrict, const char* __restrict _Nonnull, __va_list) 165 __overloadable __printflike(2, 0) __RENAME_CLANG(vsprintf) 166 __warnattr_strict("vsprintf is often misused; please use vsnprintf"); 167 char* tmpnam(char*) 168 __warnattr("tempnam is unsafe, use mkstemp or tmpfile instead"); 169 #define P_tmpdir "/tmp/" /* deprecated */ 170 char* tempnam(const char*, const char*) 171 __warnattr("tempnam is unsafe, use mkstemp or tmpfile instead"); 172 173 int rename(const char*, const char*); 174 int renameat(int, const char*, int, const char*); 175 176 int fseek(FILE*, long, int); 177 long ftell(FILE*); 178 179 #if defined(__USE_FILE_OFFSET64) && __ANDROID_API__ >= __ANDROID_API_N__ 180 int fgetpos(FILE*, fpos_t*) __RENAME(fgetpos64); 181 int fsetpos(FILE*, const fpos_t*) __RENAME(fsetpos64); 182 int fseeko(FILE*, off_t, int) __RENAME(fseeko64); 183 off_t ftello(FILE*) __RENAME(ftello64); 184 # if defined(__USE_BSD) 185 FILE* funopen(const void*, 186 int (*)(void*, char*, int), 187 int (*)(void*, const char*, int), 188 fpos_t (*)(void*, fpos_t, int), 189 int (*)(void*)) __RENAME(funopen64); 190 # endif 191 #else 192 int fgetpos(FILE*, fpos_t*); 193 int fsetpos(FILE*, const fpos_t*); 194 int fseeko(FILE*, off_t, int); 195 off_t ftello(FILE*); 196 # if defined(__USE_BSD) 197 FILE* funopen(const void*, 198 int (*)(void*, char*, int), 199 int (*)(void*, const char*, int), 200 fpos_t (*)(void*, fpos_t, int), 201 int (*)(void*)); 202 # endif 203 #endif 204 int fgetpos64(FILE*, fpos64_t*) __INTRODUCED_IN(24); 205 int fsetpos64(FILE*, const fpos64_t*) __INTRODUCED_IN(24); 206 int fseeko64(FILE*, off64_t, int) __INTRODUCED_IN(24); 207 off64_t ftello64(FILE*) __INTRODUCED_IN(24); 208 #if defined(__USE_BSD) 209 FILE* funopen64(const void*, int (*)(void*, char*, int), int (*)(void*, const char*, int), 210 fpos64_t (*)(void*, fpos64_t, int), int (*)(void*)) __INTRODUCED_IN(24); 211 #endif 212 213 FILE* fopen(const char* __restrict, const char* __restrict); 214 FILE* fopen64(const char* __restrict, const char* __restrict) __INTRODUCED_IN(24); 215 FILE* freopen(const char* __restrict, const char* __restrict, FILE* __restrict); 216 FILE* freopen64(const char* __restrict, const char* __restrict, FILE* __restrict) 217 __INTRODUCED_IN(24); 218 FILE* tmpfile(void); 219 FILE* tmpfile64(void) __INTRODUCED_IN(24); 220 221 int snprintf(char* __restrict, size_t, const char* __restrict _Nonnull, ...) 222 __printflike(3, 4) __overloadable __RENAME_CLANG(snprintf); 223 int vfscanf(FILE* __restrict, const char* __restrict _Nonnull, __va_list) __scanflike(2, 0); 224 int vscanf(const char* _Nonnull , __va_list) __scanflike(1, 0); 225 int vsnprintf(char* __restrict, size_t, const char* __restrict _Nonnull, __va_list) 226 __printflike(3, 0) __overloadable __RENAME_CLANG(vsnprintf); 227 int vsscanf(const char* __restrict _Nonnull, const char* __restrict _Nonnull, __va_list) __scanflike(2, 0); 228 229 #define L_ctermid 1024 /* size for ctermid() */ 230 char* ctermid(char*) __INTRODUCED_IN(26); 231 232 FILE* fdopen(int, const char*); 233 int fileno(FILE*); 234 int pclose(FILE*); 235 FILE* popen(const char*, const char*); 236 void flockfile(FILE*); 237 int ftrylockfile(FILE*); 238 void funlockfile(FILE*); 239 int getc_unlocked(FILE*); 240 int getchar_unlocked(void); 241 int putc_unlocked(int, FILE*); 242 int putchar_unlocked(int); 243 244 FILE* fmemopen(void*, size_t, const char*) __INTRODUCED_IN(23); 245 FILE* open_memstream(char**, size_t*) __INTRODUCED_IN(23); 246 247 #if defined(__USE_BSD) || defined(__BIONIC__) /* Historically bionic exposed these. */ 248 int asprintf(char** __restrict, const char* __restrict _Nonnull, ...) __printflike(2, 3); 249 char* fgetln(FILE* __restrict, size_t* __restrict); 250 int fpurge(FILE*); 251 void setbuffer(FILE*, char*, int); 252 int setlinebuf(FILE*); 253 int vasprintf(char** __restrict, const char* __restrict _Nonnull, __va_list) __printflike(2, 0); 254 void clearerr_unlocked(FILE*) __INTRODUCED_IN(23); 255 int feof_unlocked(FILE*) __INTRODUCED_IN(23); 256 int ferror_unlocked(FILE*) __INTRODUCED_IN(23); 257 int fileno_unlocked(FILE*) __INTRODUCED_IN(24); 258 #define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0) 259 #define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0) 260 #endif /* __USE_BSD */ 261 262 char* __fgets_chk(char*, int, FILE*, size_t) __INTRODUCED_IN(17); 263 size_t __fread_chk(void* __restrict, size_t, size_t, FILE* __restrict, size_t) 264 __INTRODUCED_IN(24); 265 size_t __fwrite_chk(const void* __restrict, size_t, size_t, FILE* __restrict, size_t) 266 __INTRODUCED_IN(24); 267 268 #if defined(__BIONIC_FORTIFY) && !defined(__BIONIC_NO_STDIO_FORTIFY) 269 270 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__ 271 __BIONIC_FORTIFY_INLINE __printflike(3, 0) 272 int vsnprintf(char *const __pass_object_size dest, size_t size, 273 const char *_Nonnull format, __va_list ap) __overloadable { 274 return __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, ap); 275 } 276 277 __BIONIC_FORTIFY_INLINE __printflike(2, 0) 278 int vsprintf(char *const __pass_object_size dest, const char *_Nonnull format, 279 __va_list ap) __overloadable { 280 return __builtin___vsprintf_chk(dest, 0, __bos(dest), format, ap); 281 } 282 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */ 283 284 #if defined(__clang__) 285 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__ 286 /* 287 * Simple case: `format` can't have format specifiers, so we can just compare 288 * its length to the length of `dest` 289 */ 290 __BIONIC_ERROR_FUNCTION_VISIBILITY 291 int snprintf(char *__restrict dest, size_t size, const char *__restrict format) 292 __overloadable 293 __enable_if(__bos(dest) != __BIONIC_FORTIFY_UNKNOWN_SIZE && 294 __bos(dest) < __builtin_strlen(format), 295 "format string will always overflow destination buffer") 296 __errorattr("format string will always overflow destination buffer"); 297 298 __BIONIC_FORTIFY_INLINE 299 __printflike(3, 4) 300 int snprintf(char *__restrict const __pass_object_size dest, 301 size_t size, const char *__restrict format, ...) __overloadable { 302 va_list va; 303 va_start(va, format); 304 int result = __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, va); 305 va_end(va); 306 return result; 307 } 308 309 __BIONIC_ERROR_FUNCTION_VISIBILITY 310 int sprintf(char *__restrict dest, const char *__restrict format) __overloadable 311 __enable_if(__bos(dest) != __BIONIC_FORTIFY_UNKNOWN_SIZE && 312 __bos(dest) < __builtin_strlen(format), 313 "format string will always overflow destination buffer") 314 __errorattr("format string will always overflow destination buffer"); 315 316 __BIONIC_FORTIFY_INLINE 317 __printflike(2, 3) 318 int sprintf(char *__restrict const __pass_object_size dest, 319 const char *__restrict format, ...) __overloadable { 320 va_list va; 321 va_start(va, format); 322 int result = __builtin___vsprintf_chk(dest, 0, __bos(dest), format, va); 323 va_end(va); 324 return result; 325 } 326 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */ 327 328 #if __ANDROID_API__ >= __ANDROID_API_N__ 329 __BIONIC_FORTIFY_INLINE 330 size_t fread(void *__restrict buf, size_t size, size_t count, 331 FILE *__restrict stream) __overloadable 332 __enable_if(__unsafe_check_mul_overflow(size, count), "size * count overflows") 333 __errorattr("size * count overflows"); 334 335 __BIONIC_FORTIFY_INLINE 336 size_t fread(void *__restrict buf, size_t size, size_t count, 337 FILE *__restrict stream) __overloadable 338 __enable_if(!__unsafe_check_mul_overflow(size, count), "no overflow") 339 __enable_if(__bos(buf) != __BIONIC_FORTIFY_UNKNOWN_SIZE && 340 size * count > __bos(buf), "size * count is too large") 341 __errorattr("size * count is too large"); 342 343 __BIONIC_FORTIFY_INLINE 344 size_t fread(void *__restrict const __pass_object_size0 buf, size_t size, 345 size_t count, FILE *__restrict stream) __overloadable { 346 size_t bos = __bos0(buf); 347 348 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 349 return __call_bypassing_fortify(fread)(buf, size, count, stream); 350 } 351 352 return __fread_chk(buf, size, count, stream, bos); 353 } 354 355 size_t fwrite(const void * __restrict buf, size_t size, 356 size_t count, FILE * __restrict stream) __overloadable 357 __enable_if(__unsafe_check_mul_overflow(size, count), 358 "size * count overflows") 359 __errorattr("size * count overflows"); 360 361 size_t fwrite(const void * __restrict buf, size_t size, 362 size_t count, FILE * __restrict stream) __overloadable 363 __enable_if(!__unsafe_check_mul_overflow(size, count), "no overflow") 364 __enable_if(__bos(buf) != __BIONIC_FORTIFY_UNKNOWN_SIZE && 365 size * count > __bos(buf), "size * count is too large") 366 __errorattr("size * count is too large"); 367 368 __BIONIC_FORTIFY_INLINE 369 size_t fwrite(const void * __restrict const __pass_object_size0 buf, 370 size_t size, size_t count, FILE * __restrict stream) 371 __overloadable { 372 size_t bos = __bos0(buf); 373 374 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 375 return __call_bypassing_fortify(fwrite)(buf, size, count, stream); 376 } 377 378 return __fwrite_chk(buf, size, count, stream, bos); 379 } 380 #endif /* __ANDROID_API__ >= __ANDROID_API_N__ */ 381 382 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__ 383 __BIONIC_ERROR_FUNCTION_VISIBILITY 384 char *fgets(char* __restrict dest, int size, FILE* stream) __overloadable 385 __enable_if(size < 0, "size is negative") 386 __errorattr("size is negative"); 387 388 __BIONIC_ERROR_FUNCTION_VISIBILITY 389 char *fgets(char* dest, int size, FILE* stream) __overloadable 390 __enable_if(size >= 0 && size > __bos(dest), 391 "size is larger than the destination buffer") 392 __errorattr("size is larger than the destination buffer"); 393 394 __BIONIC_FORTIFY_INLINE 395 char *fgets(char* __restrict const __pass_object_size dest, 396 int size, FILE* stream) __overloadable { 397 size_t bos = __bos(dest); 398 399 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 400 return __call_bypassing_fortify(fgets)(dest, size, stream); 401 } 402 403 return __fgets_chk(dest, size, stream, bos); 404 } 405 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */ 406 407 #else /* defined(__clang__) */ 408 409 size_t __fread_real(void * __restrict, size_t, size_t, FILE * __restrict) __RENAME(fread); 410 __errordecl(__fread_too_big_error, "fread called with size * count bigger than buffer"); 411 __errordecl(__fread_overflow, "fread called with overflowing size * count"); 412 413 char* __fgets_real(char*, int, FILE*) __RENAME(fgets); 414 __errordecl(__fgets_too_big_error, "fgets called with size bigger than buffer"); 415 __errordecl(__fgets_too_small_error, "fgets called with size less than zero"); 416 417 size_t __fwrite_real(const void * __restrict, size_t, size_t, FILE * __restrict) __RENAME(fwrite); 418 __errordecl(__fwrite_too_big_error, "fwrite called with size * count bigger than buffer"); 419 __errordecl(__fwrite_overflow, "fwrite called with overflowing size * count"); 420 421 422 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__ 423 __BIONIC_FORTIFY_INLINE __printflike(3, 4) 424 int snprintf(char *__restrict dest, size_t size, const char* _Nonnull format, ...) 425 { 426 return __builtin___snprintf_chk(dest, size, 0, __bos(dest), format, 427 __builtin_va_arg_pack()); 428 } 429 430 __BIONIC_FORTIFY_INLINE __printflike(2, 3) 431 int sprintf(char *__restrict dest, const char* _Nonnull format, ...) { 432 return __builtin___sprintf_chk(dest, 0, __bos(dest), format, 433 __builtin_va_arg_pack()); 434 } 435 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */ 436 437 #if __ANDROID_API__ >= __ANDROID_API_N__ 438 __BIONIC_FORTIFY_INLINE 439 size_t fread(void *__restrict buf, size_t size, size_t count, FILE * __restrict stream) { 440 size_t bos = __bos0(buf); 441 442 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 443 return __fread_real(buf, size, count, stream); 444 } 445 446 if (__builtin_constant_p(size) && __builtin_constant_p(count)) { 447 size_t total; 448 if (__size_mul_overflow(size, count, &total)) { 449 __fread_overflow(); 450 } 451 452 if (total > bos) { 453 __fread_too_big_error(); 454 } 455 456 return __fread_real(buf, size, count, stream); 457 } 458 459 return __fread_chk(buf, size, count, stream, bos); 460 } 461 462 __BIONIC_FORTIFY_INLINE 463 size_t fwrite(const void * __restrict buf, size_t size, size_t count, FILE * __restrict stream) { 464 size_t bos = __bos0(buf); 465 466 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 467 return __fwrite_real(buf, size, count, stream); 468 } 469 470 if (__builtin_constant_p(size) && __builtin_constant_p(count)) { 471 size_t total; 472 if (__size_mul_overflow(size, count, &total)) { 473 __fwrite_overflow(); 474 } 475 476 if (total > bos) { 477 __fwrite_too_big_error(); 478 } 479 480 return __fwrite_real(buf, size, count, stream); 481 } 482 483 return __fwrite_chk(buf, size, count, stream, bos); 484 } 485 #endif /* __ANDROID_API__ >= __ANDROID_API_N__ */ 486 487 #if __ANDROID_API__ >= __ANDROID_API_J_MR1__ 488 __BIONIC_FORTIFY_INLINE 489 char *fgets(char* dest, int size, FILE* stream) { 490 size_t bos = __bos(dest); 491 492 // Compiler can prove, at compile time, that the passed in size 493 // is always negative. Force a compiler error. 494 if (__builtin_constant_p(size) && (size < 0)) { 495 __fgets_too_small_error(); 496 } 497 498 // Compiler doesn't know destination size. Don't call __fgets_chk 499 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) { 500 return __fgets_real(dest, size, stream); 501 } 502 503 // Compiler can prove, at compile time, that the passed in size 504 // is always <= the actual object size. Don't call __fgets_chk 505 if (__builtin_constant_p(size) && (size <= (int) bos)) { 506 return __fgets_real(dest, size, stream); 507 } 508 509 // Compiler can prove, at compile time, that the passed in size 510 // is always > the actual object size. Force a compiler error. 511 if (__builtin_constant_p(size) && (size > (int) bos)) { 512 __fgets_too_big_error(); 513 } 514 515 return __fgets_chk(dest, size, stream, bos); 516 } 517 #endif /* __ANDROID_API__ >= __ANDROID_API_J_MR1__ */ 518 519 #endif /* defined(__clang__) */ 520 #endif /* defined(__BIONIC_FORTIFY) */ 521 522 #if defined(__clang__) 523 #pragma clang diagnostic pop 524 #endif 525 526 __END_DECLS 527 528 #endif /* _STDIO_H_ */ 529
