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)
180 int fgetpos(FILE*, fpos_t*) __RENAME(fgetpos64) __INTRODUCED_IN(24);
181 int fsetpos(FILE*, const fpos_t*) __RENAME(fsetpos64) __INTRODUCED_IN(24);
182 int fseeko(FILE*, off_t, int) __RENAME(fseeko64) __INTRODUCED_IN(24);
183 off_t ftello(FILE*) __RENAME(ftello64) __INTRODUCED_IN(24);
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) __INTRODUCED_IN(24);
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)
vsnprintf(char * const __pass_object_size dest,size_t size,const char * _Nonnull format,__va_list ap)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)
vsprintf(char * const __pass_object_size dest,const char * _Nonnull format,__va_list ap)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)
snprintf(char * __restrict const __pass_object_size dest,size_t size,const char * __restrict format,...)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)
sprintf(char * __restrict const __pass_object_size dest,const char * __restrict format,...)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
fread(void * __restrict const __pass_object_size0 buf,size_t size,size_t count,FILE * __restrict stream)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
fwrite(const void * __restrict const __pass_object_size0 buf,size_t size,size_t count,FILE * __restrict stream)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
fgets(char * __restrict const __pass_object_size dest,int size,FILE * stream)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)
snprintf(char * __restrict dest,size_t size,const char * _Nonnull format,...)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)
sprintf(char * __restrict dest,const char * _Nonnull format,...)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
fread(void * __restrict buf,size_t size,size_t count,FILE * __restrict stream)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
fwrite(const void * __restrict buf,size_t size,size_t count,FILE * __restrict stream)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
fgets(char * dest,int size,FILE * stream)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