blob: 90f595c9eef062f2aa4631fb4a55f2ccdd759cd0 [file] [log] [blame]
The Android Open Source Project1dc9e472009-03-03 19:28:35 -08001/* $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>
Elliott Hughes3975cec2012-11-29 17:25:23 -080042#include <sys/types.h>
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080043
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080044#include <stdarg.h>
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080045#include <stddef.h>
46
Elliott Hughes7d56ccb2012-10-01 17:56:58 -070047#define __need_NULL
48#include <stddef.h>
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080049
50#define _FSTDIO /* Define for new stdio with functions. */
51
52typedef 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 */
61struct __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.
Andy McFaddenc1202512009-11-25 14:16:53 -080089 *
90 * NOTE: if you change this structure, you also need to update the
91 * std() initializer in findfp.c.
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080092 */
93typedef 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
128extern 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 */
Elliott Hughesd04c1832013-05-14 16:08:43 -0700142#define __SOPT 0x0400 /* do fseek() optimization */
143#define __SNPT 0x0800 /* do not do fseek() optimization */
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800144#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 */
Kenny Rootf5823402011-02-12 07:13:44 -0800147#define __SIGN 0x8000 /* ignore this file in _fwalk */
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800148
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 */
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800163#define EOF (-1)
164
165/*
Elliott Hughesd04c1832013-05-14 16:08:43 -0700166 * 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.
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800169 */
Elliott Hughesd04c1832013-05-14 16:08:43 -0700170
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800171#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
Elliott Hughesd04c1832013-05-14 16:08:43 -0700181/* Always ensure that these are consistent with <fcntl.h> and <unistd.h>! */
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800182#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
200void clearerr(FILE *);
201int fclose(FILE *);
202int feof(FILE *);
203int ferror(FILE *);
204int fflush(FILE *);
205int fgetc(FILE *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700206char *fgets(char * __restrict, int, FILE * __restrict);
207FILE *fopen(const char * __restrict , const char * __restrict);
208int fprintf(FILE * __restrict , const char * __restrict, ...)
209 __printflike(2, 3);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800210int fputc(int, FILE *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700211int fputs(const char * __restrict, FILE * __restrict);
212size_t fread(void * __restrict, size_t, size_t, FILE * __restrict);
213FILE *freopen(const char * __restrict, const char * __restrict,
214 FILE * __restrict);
215int fscanf(FILE * __restrict, const char * __restrict, ...)
216 __scanflike(2, 3);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800217int fseek(FILE *, long, int);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800218long ftell(FILE *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700219size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800220int getc(FILE *);
221int getchar(void);
Irina Tirdeaeac9eb42012-09-08 09:28:30 +0300222ssize_t getdelim(char ** __restrict, size_t * __restrict, int,
223 FILE * __restrict);
224ssize_t getline(char ** __restrict, size_t * __restrict, FILE * __restrict);
Elliott Hughesc13fb752013-12-17 20:43:30 -0800225
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800226#if __BSD_VISIBLE && !defined(__SYS_ERRLIST)
227#define __SYS_ERRLIST
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800228extern int sys_nerr; /* perror(3) external variables */
229extern char *sys_errlist[];
230#endif
Elliott Hughesc13fb752013-12-17 20:43:30 -0800231
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800232void perror(const char *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700233int printf(const char * __restrict, ...)
234 __printflike(1, 2);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800235int putc(int, FILE *);
236int putchar(int);
237int puts(const char *);
238int remove(const char *);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800239void rewind(FILE *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700240int scanf(const char * __restrict, ...)
241 __scanflike(1, 2);
242void setbuf(FILE * __restrict, char * __restrict);
243int setvbuf(FILE * __restrict, char * __restrict, int, size_t);
244int sscanf(const char * __restrict, const char * __restrict, ...)
245 __scanflike(2, 3);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800246FILE *tmpfile(void);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800247int ungetc(int, FILE *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700248int vfprintf(FILE * __restrict, const char * __restrict, __va_list)
249 __printflike(2, 0);
250int vprintf(const char * __restrict, __va_list)
251 __printflike(1, 0);
252
Elliott Hughesfcac8ff2014-05-22 01:24:30 -0700253int dprintf(int, const char * __restrict, ...) __printflike(2, 3);
254int vdprintf(int, const char * __restrict, __va_list) __printflike(2, 0);
255
Elliott Hughesd04c1832013-05-14 16:08:43 -0700256#ifndef __AUDIT__
Elliott Hughesc13fb752013-12-17 20:43:30 -0800257char* gets(char*) __warnattr("gets is very unsafe; consider using fgets");
258int sprintf(char* __restrict, const char* __restrict, ...)
259 __printflike(2, 3) __warnattr("sprintf is often misused; please use snprintf");
260char* tmpnam(char*) __warnattr("tmpnam possibly used unsafely; consider using mkstemp");
261int vsprintf(char* __restrict, const char* __restrict, __va_list)
262 __printflike(2, 0) __warnattr("vsprintf is often misused; please use vsnprintf");
263#if __XPG_VISIBLE
264char* tempnam(const char*, const char*)
265 __warnattr("tempnam possibly used unsafely; consider using mkstemp");
266#endif
Elliott Hughesd04c1832013-05-14 16:08:43 -0700267#endif
268
Elliott Hughesf8fcfbc2013-10-22 13:28:46 -0700269extern int rename(const char*, const char*);
270extern int renameat(int, const char*, int, const char*);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700271
272int fgetpos(FILE * __restrict, fpos_t * __restrict);
273int fsetpos(FILE *, const fpos_t *);
274
275int fseeko(FILE *, off_t, int);
276off_t ftello(FILE *);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800277
278#if __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE
Elliott Hughesd04c1832013-05-14 16:08:43 -0700279int snprintf(char * __restrict, size_t, const char * __restrict, ...)
280 __printflike(3, 4);
281int vfscanf(FILE * __restrict, const char * __restrict, __va_list)
282 __scanflike(2, 0);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800283int vscanf(const char *, __va_list)
Elliott Hughesd04c1832013-05-14 16:08:43 -0700284 __scanflike(1, 0);
285int vsnprintf(char * __restrict, size_t, const char * __restrict, __va_list)
286 __printflike(3, 0);
287int vsscanf(const char * __restrict, const char * __restrict, __va_list)
288 __scanflike(2, 0);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800289#endif /* __ISO_C_VISIBLE >= 1999 || __BSD_VISIBLE */
290
291__END_DECLS
292
293
294/*
295 * Functions defined in POSIX 1003.1.
296 */
297#if __BSD_VISIBLE || __POSIX_VISIBLE || __XPG_VISIBLE
298#define L_ctermid 1024 /* size for ctermid(); PATH_MAX */
299#define L_cuserid 9 /* size for cuserid(); UT_NAMESIZE + 1 */
300
301__BEGIN_DECLS
David 'Digit' Turnerbb5581a2010-10-09 17:56:55 +0200302#if 0 /* MISSING FROM BIONIC */
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800303char *ctermid(char *);
304char *cuserid(char *);
David 'Digit' Turnerbb5581a2010-10-09 17:56:55 +0200305#endif /* MISSING */
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800306FILE *fdopen(int, const char *);
307int fileno(FILE *);
308
David 'Digit' Turner50ace4f2010-06-16 16:36:41 -0700309#if (__POSIX_VISIBLE >= 199209)
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800310int pclose(FILE *);
311FILE *popen(const char *, const char *);
312#endif
313
314#if __POSIX_VISIBLE >= 199506
315void flockfile(FILE *);
316int ftrylockfile(FILE *);
317void funlockfile(FILE *);
318
319/*
320 * These are normally used through macros as defined below, but POSIX
321 * requires functions as well.
322 */
323int getc_unlocked(FILE *);
324int getchar_unlocked(void);
325int putc_unlocked(int, FILE *);
326int putchar_unlocked(int);
327#endif /* __POSIX_VISIBLE >= 199506 */
328
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800329__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
Elliott Hughesd04c1832013-05-14 16:08:43 -0700338int asprintf(char ** __restrict, const char * __restrict, ...)
339 __printflike(2, 3);
340char *fgetln(FILE * __restrict, size_t * __restrict);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800341int fpurge(FILE *);
342int getw(FILE *);
343int putw(int, FILE *);
344void setbuffer(FILE *, char *, int);
345int setlinebuf(FILE *);
Elliott Hughesd04c1832013-05-14 16:08:43 -0700346int vasprintf(char ** __restrict, const char * __restrict,
347 __va_list)
348 __printflike(2, 0);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800349__END_DECLS
350
351/*
352 * Stdio function-access interface.
353 */
354__BEGIN_DECLS
355FILE *funopen(const void *,
356 int (*)(void *, char *, int),
357 int (*)(void *, const char *, int),
358 fpos_t (*)(void *, fpos_t, int),
359 int (*)(void *));
360__END_DECLS
361#define fropen(cookie, fn) funopen(cookie, fn, 0, 0, 0)
362#define fwopen(cookie, fn) funopen(cookie, 0, fn, 0, 0)
363#endif /* __BSD_VISIBLE */
364
Nick Kralevichc6eb9852013-06-24 11:44:00 -0700365#if defined(__BIONIC_FORTIFY)
Nick Kralevichcffdf662012-06-11 15:50:57 -0700366
Elliott Hughesce45fea2012-10-22 16:10:27 -0700367__BEGIN_DECLS
368
Nick Kralevichcffdf662012-06-11 15:50:57 -0700369__BIONIC_FORTIFY_INLINE
Elliott Hughesd04c1832013-05-14 16:08:43 -0700370__printflike(3, 0)
Nick Kralevich9b549c32012-06-12 15:59:04 -0700371int vsnprintf(char *dest, size_t size, const char *format, __va_list ap)
Nick Kralevichcffdf662012-06-11 15:50:57 -0700372{
Nick Kralevich9020fd52013-04-30 11:31:35 -0700373 return __builtin___vsnprintf_chk(dest, size, 0, __bos(dest), format, ap);
Nick Kralevichcffdf662012-06-11 15:50:57 -0700374}
375
Nick Kralevich9b549c32012-06-12 15:59:04 -0700376__BIONIC_FORTIFY_INLINE
Elliott Hughesd04c1832013-05-14 16:08:43 -0700377__printflike(2, 0)
Nick Kralevich9b549c32012-06-12 15:59:04 -0700378int vsprintf(char *dest, const char *format, __va_list ap)
379{
Nick Kralevich9020fd52013-04-30 11:31:35 -0700380 return __builtin___vsprintf_chk(dest, 0, __bos(dest), format, ap);
Nick Kralevich9b549c32012-06-12 15:59:04 -0700381}
382
Nick Kralevich621b19d2013-06-25 10:02:35 -0700383#if defined(__clang__)
Nick Kralevich7eb28b52014-03-18 17:03:38 -0700384 #if !defined(snprintf)
385 #define __wrap_snprintf(dest, size, ...) __builtin___snprintf_chk(dest, size, 0, __bos(dest), __VA_ARGS__)
386 #define snprintf(...) __wrap_snprintf(__VA_ARGS__)
387 #endif
Nick Kralevich621b19d2013-06-25 10:02:35 -0700388#else
Nick Kralevichcffdf662012-06-11 15:50:57 -0700389__BIONIC_FORTIFY_INLINE
Elliott Hughesd04c1832013-05-14 16:08:43 -0700390__printflike(3, 4)
Nick Kralevich621b19d2013-06-25 10:02:35 -0700391int snprintf(char *dest, size_t size, const char *format, ...)
Nick Kralevichcffdf662012-06-11 15:50:57 -0700392{
Nick Kralevich621b19d2013-06-25 10:02:35 -0700393 return __builtin___snprintf_chk(dest, size, 0,
394 __bos(dest), format, __builtin_va_arg_pack());
Nick Kralevich9b549c32012-06-12 15:59:04 -0700395}
Nick Kralevich621b19d2013-06-25 10:02:35 -0700396#endif
Nick Kralevich9b549c32012-06-12 15:59:04 -0700397
Nick Kralevichc6eb9852013-06-24 11:44:00 -0700398#if defined(__clang__)
Nick Kralevich7eb28b52014-03-18 17:03:38 -0700399 #if !defined(sprintf)
400 #define __wrap_sprintf(dest, ...) __builtin___sprintf_chk(dest, 0, __bos(dest), __VA_ARGS__)
401 #define sprintf(...) __wrap_sprintf(__VA_ARGS__)
402 #endif
Nick Kralevichc6eb9852013-06-24 11:44:00 -0700403#else
Nick Kralevich9b549c32012-06-12 15:59:04 -0700404__BIONIC_FORTIFY_INLINE
Elliott Hughesd04c1832013-05-14 16:08:43 -0700405__printflike(2, 3)
Nick Kralevich9b549c32012-06-12 15:59:04 -0700406int sprintf(char *dest, const char *format, ...)
407{
408 return __builtin___sprintf_chk(dest, 0,
Nick Kralevich78d6d982013-04-29 16:29:37 -0700409 __bos(dest), format, __builtin_va_arg_pack());
Nick Kralevichcffdf662012-06-11 15:50:57 -0700410}
Nick Kralevichc6eb9852013-06-24 11:44:00 -0700411#endif
Nick Kralevichcffdf662012-06-11 15:50:57 -0700412
Elliott Hughescd0609f2013-12-19 12:21:07 -0800413extern char* __fgets_chk(char*, int, FILE*, size_t);
414extern char* __fgets_real(char*, int, FILE*) __asm__(__USER_LABEL_PREFIX__ "fgets");
Nick Kralevichb24c0632013-06-18 10:46:02 -0700415__errordecl(__fgets_too_big_error, "fgets called with size bigger than buffer");
416__errordecl(__fgets_too_small_error, "fgets called with size less than zero");
Elliott Hughescd0609f2013-12-19 12:21:07 -0800417
418#if !defined(__clang__)
Nick Kralevich965dbc62012-07-03 11:45:31 -0700419
420__BIONIC_FORTIFY_INLINE
Elliott Hughescd0609f2013-12-19 12:21:07 -0800421char *fgets(char* dest, int size, FILE* stream) {
Nick Kralevich9020fd52013-04-30 11:31:35 -0700422 size_t bos = __bos(dest);
Nick Kralevich965dbc62012-07-03 11:45:31 -0700423
424 // Compiler can prove, at compile time, that the passed in size
425 // is always negative. Force a compiler error.
426 if (__builtin_constant_p(size) && (size < 0)) {
427 __fgets_too_small_error();
428 }
429
430 // Compiler doesn't know destination size. Don't call __fgets_chk
Nick Kralevich9b6cc222012-07-13 14:46:36 -0700431 if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
Nick Kralevich965dbc62012-07-03 11:45:31 -0700432 return __fgets_real(dest, size, stream);
433 }
434
435 // Compiler can prove, at compile time, that the passed in size
436 // is always <= the actual object size. Don't call __fgets_chk
Elliott Hughes41b31792013-01-28 10:36:31 -0800437 if (__builtin_constant_p(size) && (size <= (int) bos)) {
Nick Kralevich965dbc62012-07-03 11:45:31 -0700438 return __fgets_real(dest, size, stream);
439 }
440
441 // Compiler can prove, at compile time, that the passed in size
442 // is always > the actual object size. Force a compiler error.
Elliott Hughes41b31792013-01-28 10:36:31 -0800443 if (__builtin_constant_p(size) && (size > (int) bos)) {
Nick Kralevich965dbc62012-07-03 11:45:31 -0700444 __fgets_too_big_error();
445 }
446
447 return __fgets_chk(dest, size, stream, bos);
448}
449
Nick Kralevichc6eb9852013-06-24 11:44:00 -0700450#endif /* !defined(__clang__) */
451
Elliott Hughesce45fea2012-10-22 16:10:27 -0700452__END_DECLS
453
Nick Kralevichc6eb9852013-06-24 11:44:00 -0700454#endif /* defined(__BIONIC_FORTIFY) */
Nick Kralevichcffdf662012-06-11 15:50:57 -0700455
The Android Open Source Project1dc9e472009-03-03 19:28:35 -0800456#endif /* _STDIO_H_ */