Line data Source code
1 : /* Checking macros for stdio functions.
2 : Copyright (C) 2004-2016 Free Software Foundation, Inc.
3 : This file is part of the GNU C Library.
4 :
5 : The GNU C Library is free software; you can redistribute it and/or
6 : modify it under the terms of the GNU Lesser General Public
7 : License as published by the Free Software Foundation; either
8 : version 2.1 of the License, or (at your option) any later version.
9 :
10 : The GNU C Library is distributed in the hope that it will be useful,
11 : but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 : Lesser General Public License for more details.
14 :
15 : You should have received a copy of the GNU Lesser General Public
16 : License along with the GNU C Library; if not, see
17 : <http://www.gnu.org/licenses/>. */
18 :
19 : #ifndef _STDIO_H
20 : # error "Never include <bits/stdio2.h> directly; use <stdio.h> instead."
21 : #endif
22 :
23 : extern int __sprintf_chk (char *__restrict __s, int __flag, size_t __slen,
24 : const char *__restrict __format, ...) __THROW;
25 : extern int __vsprintf_chk (char *__restrict __s, int __flag, size_t __slen,
26 : const char *__restrict __format,
27 : _G_va_list __ap) __THROW;
28 :
29 : #ifdef __va_arg_pack
30 : __fortify_function int
31 : __NTH (sprintf (char *__restrict __s, const char *__restrict __fmt, ...))
32 : {
33 : return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
34 : __bos (__s), __fmt, __va_arg_pack ());
35 : }
36 : #elif !defined __cplusplus
37 : # define sprintf(str, ...) \
38 : __builtin___sprintf_chk (str, __USE_FORTIFY_LEVEL - 1, __bos (str), \
39 : __VA_ARGS__)
40 : #endif
41 :
42 : __fortify_function int
43 : __NTH (vsprintf (char *__restrict __s, const char *__restrict __fmt,
44 : _G_va_list __ap))
45 : {
46 : return __builtin___vsprintf_chk (__s, __USE_FORTIFY_LEVEL - 1,
47 : __bos (__s), __fmt, __ap);
48 : }
49 :
50 : #if defined __USE_ISOC99 || defined __USE_UNIX98
51 :
52 : extern int __snprintf_chk (char *__restrict __s, size_t __n, int __flag,
53 : size_t __slen, const char *__restrict __format,
54 : ...) __THROW;
55 : extern int __vsnprintf_chk (char *__restrict __s, size_t __n, int __flag,
56 : size_t __slen, const char *__restrict __format,
57 : _G_va_list __ap) __THROW;
58 :
59 : # ifdef __va_arg_pack
60 : __fortify_function int
61 : __NTH (snprintf (char *__restrict __s, size_t __n,
62 : const char *__restrict __fmt, ...))
63 : {
64 : return __builtin___snprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
65 : __bos (__s), __fmt, __va_arg_pack ());
66 : }
67 : # elif !defined __cplusplus
68 : # define snprintf(str, len, ...) \
69 : __builtin___snprintf_chk (str, len, __USE_FORTIFY_LEVEL - 1, __bos (str), \
70 : __VA_ARGS__)
71 : # endif
72 :
73 : __fortify_function int
74 : __NTH (vsnprintf (char *__restrict __s, size_t __n,
75 : const char *__restrict __fmt, _G_va_list __ap))
76 : {
77 : return __builtin___vsnprintf_chk (__s, __n, __USE_FORTIFY_LEVEL - 1,
78 : __bos (__s), __fmt, __ap);
79 : }
80 :
81 : #endif
82 :
83 : #if __USE_FORTIFY_LEVEL > 1
84 :
85 : extern int __fprintf_chk (FILE *__restrict __stream, int __flag,
86 : const char *__restrict __format, ...);
87 : extern int __printf_chk (int __flag, const char *__restrict __format, ...);
88 : extern int __vfprintf_chk (FILE *__restrict __stream, int __flag,
89 : const char *__restrict __format, _G_va_list __ap);
90 : extern int __vprintf_chk (int __flag, const char *__restrict __format,
91 : _G_va_list __ap);
92 :
93 : # ifdef __va_arg_pack
94 : __fortify_function int
95 : fprintf (FILE *__restrict __stream, const char *__restrict __fmt, ...)
96 : {
97 0 : return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
98 : __va_arg_pack ());
99 : }
100 :
101 : __fortify_function int
102 : printf (const char *__restrict __fmt, ...)
103 : {
104 0 : return __printf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __va_arg_pack ());
105 : }
106 : # elif !defined __cplusplus
107 : # define printf(...) \
108 : __printf_chk (__USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
109 : # define fprintf(stream, ...) \
110 : __fprintf_chk (stream, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
111 : # endif
112 :
113 : __fortify_function int
114 : vprintf (const char *__restrict __fmt, _G_va_list __ap)
115 : {
116 : #ifdef __USE_EXTERN_INLINES
117 : return __vfprintf_chk (stdout, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
118 : #else
119 : return __vprintf_chk (__USE_FORTIFY_LEVEL - 1, __fmt, __ap);
120 : #endif
121 : }
122 :
123 : __fortify_function int
124 : vfprintf (FILE *__restrict __stream,
125 : const char *__restrict __fmt, _G_va_list __ap)
126 : {
127 : return __vfprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
128 : }
129 :
130 : # ifdef __USE_XOPEN2K8
131 : extern int __dprintf_chk (int __fd, int __flag, const char *__restrict __fmt,
132 : ...) __attribute__ ((__format__ (__printf__, 3, 4)));
133 : extern int __vdprintf_chk (int __fd, int __flag,
134 : const char *__restrict __fmt, _G_va_list __arg)
135 : __attribute__ ((__format__ (__printf__, 3, 0)));
136 :
137 : # ifdef __va_arg_pack
138 : __fortify_function int
139 : dprintf (int __fd, const char *__restrict __fmt, ...)
140 : {
141 : return __dprintf_chk (__fd, __USE_FORTIFY_LEVEL - 1, __fmt,
142 : __va_arg_pack ());
143 : }
144 : # elif !defined __cplusplus
145 : # define dprintf(fd, ...) \
146 : __dprintf_chk (fd, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
147 : # endif
148 :
149 : __fortify_function int
150 : vdprintf (int __fd, const char *__restrict __fmt, _G_va_list __ap)
151 : {
152 : return __vdprintf_chk (__fd, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
153 : }
154 : # endif
155 :
156 : # ifdef __USE_GNU
157 :
158 : extern int __asprintf_chk (char **__restrict __ptr, int __flag,
159 : const char *__restrict __fmt, ...)
160 : __THROW __attribute__ ((__format__ (__printf__, 3, 4))) __wur;
161 : extern int __vasprintf_chk (char **__restrict __ptr, int __flag,
162 : const char *__restrict __fmt, _G_va_list __arg)
163 : __THROW __attribute__ ((__format__ (__printf__, 3, 0))) __wur;
164 : extern int __obstack_printf_chk (struct obstack *__restrict __obstack,
165 : int __flag, const char *__restrict __format,
166 : ...)
167 : __THROW __attribute__ ((__format__ (__printf__, 3, 4)));
168 : extern int __obstack_vprintf_chk (struct obstack *__restrict __obstack,
169 : int __flag,
170 : const char *__restrict __format,
171 : _G_va_list __args)
172 : __THROW __attribute__ ((__format__ (__printf__, 3, 0)));
173 :
174 : # ifdef __va_arg_pack
175 : __fortify_function int
176 : __NTH (asprintf (char **__restrict __ptr, const char *__restrict __fmt, ...))
177 : {
178 : return __asprintf_chk (__ptr, __USE_FORTIFY_LEVEL - 1, __fmt,
179 : __va_arg_pack ());
180 : }
181 :
182 : __fortify_function int
183 : __NTH (__asprintf (char **__restrict __ptr, const char *__restrict __fmt,
184 : ...))
185 : {
186 : return __asprintf_chk (__ptr, __USE_FORTIFY_LEVEL - 1, __fmt,
187 : __va_arg_pack ());
188 : }
189 :
190 : __fortify_function int
191 : __NTH (obstack_printf (struct obstack *__restrict __obstack,
192 : const char *__restrict __fmt, ...))
193 : {
194 : return __obstack_printf_chk (__obstack, __USE_FORTIFY_LEVEL - 1, __fmt,
195 : __va_arg_pack ());
196 : }
197 : # elif !defined __cplusplus
198 : # define asprintf(ptr, ...) \
199 : __asprintf_chk (ptr, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
200 : # define __asprintf(ptr, ...) \
201 : __asprintf_chk (ptr, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
202 : # define obstack_printf(obstack, ...) \
203 : __obstack_printf_chk (obstack, __USE_FORTIFY_LEVEL - 1, __VA_ARGS__)
204 : # endif
205 :
206 : __fortify_function int
207 : __NTH (vasprintf (char **__restrict __ptr, const char *__restrict __fmt,
208 : _G_va_list __ap))
209 : {
210 : return __vasprintf_chk (__ptr, __USE_FORTIFY_LEVEL - 1, __fmt, __ap);
211 : }
212 :
213 : __fortify_function int
214 : __NTH (obstack_vprintf (struct obstack *__restrict __obstack,
215 : const char *__restrict __fmt, _G_va_list __ap))
216 : {
217 : return __obstack_vprintf_chk (__obstack, __USE_FORTIFY_LEVEL - 1, __fmt,
218 : __ap);
219 : }
220 :
221 : # endif
222 :
223 : #endif
224 :
225 : #if !defined __USE_ISOC11 \
226 : || (defined __cplusplus && __cplusplus <= 201103L && !defined __USE_GNU)
227 : extern char *__gets_chk (char *__str, size_t) __wur;
228 : extern char *__REDIRECT (__gets_warn, (char *__str), gets)
229 : __wur __warnattr ("please use fgets or getline instead, gets can't "
230 : "specify buffer size");
231 :
232 : __fortify_function __wur char *
233 : gets (char *__str)
234 : {
235 : if (__bos (__str) != (size_t) -1)
236 : return __gets_chk (__str, __bos (__str));
237 : return __gets_warn (__str);
238 : }
239 : #endif
240 :
241 : extern char *__fgets_chk (char *__restrict __s, size_t __size, int __n,
242 : FILE *__restrict __stream) __wur;
243 : extern char *__REDIRECT (__fgets_alias,
244 : (char *__restrict __s, int __n,
245 : FILE *__restrict __stream), fgets) __wur;
246 : extern char *__REDIRECT (__fgets_chk_warn,
247 : (char *__restrict __s, size_t __size, int __n,
248 : FILE *__restrict __stream), __fgets_chk)
249 : __wur __warnattr ("fgets called with bigger size than length "
250 : "of destination buffer");
251 :
252 : __fortify_function __wur char *
253 : fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
254 : {
255 : if (__bos (__s) != (size_t) -1)
256 : {
257 : if (!__builtin_constant_p (__n) || __n <= 0)
258 : return __fgets_chk (__s, __bos (__s), __n, __stream);
259 :
260 : if ((size_t) __n > __bos (__s))
261 : return __fgets_chk_warn (__s, __bos (__s), __n, __stream);
262 : }
263 : return __fgets_alias (__s, __n, __stream);
264 : }
265 :
266 : extern size_t __fread_chk (void *__restrict __ptr, size_t __ptrlen,
267 : size_t __size, size_t __n,
268 : FILE *__restrict __stream) __wur;
269 : extern size_t __REDIRECT (__fread_alias,
270 : (void *__restrict __ptr, size_t __size,
271 : size_t __n, FILE *__restrict __stream),
272 : fread) __wur;
273 : extern size_t __REDIRECT (__fread_chk_warn,
274 : (void *__restrict __ptr, size_t __ptrlen,
275 : size_t __size, size_t __n,
276 : FILE *__restrict __stream),
277 : __fread_chk)
278 : __wur __warnattr ("fread called with bigger size * nmemb than length "
279 : "of destination buffer");
280 :
281 : __fortify_function __wur size_t
282 : fread (void *__restrict __ptr, size_t __size, size_t __n,
283 : FILE *__restrict __stream)
284 : {
285 : if (__bos0 (__ptr) != (size_t) -1)
286 : {
287 : if (!__builtin_constant_p (__size)
288 : || !__builtin_constant_p (__n)
289 : || (__size | __n) >= (((size_t) 1) << (8 * sizeof (size_t) / 2)))
290 : return __fread_chk (__ptr, __bos0 (__ptr), __size, __n, __stream);
291 :
292 : if (__size * __n > __bos0 (__ptr))
293 : return __fread_chk_warn (__ptr, __bos0 (__ptr), __size, __n, __stream);
294 : }
295 : return __fread_alias (__ptr, __size, __n, __stream);
296 : }
297 :
298 : #ifdef __USE_GNU
299 : extern char *__fgets_unlocked_chk (char *__restrict __s, size_t __size,
300 : int __n, FILE *__restrict __stream) __wur;
301 : extern char *__REDIRECT (__fgets_unlocked_alias,
302 : (char *__restrict __s, int __n,
303 : FILE *__restrict __stream), fgets_unlocked) __wur;
304 : extern char *__REDIRECT (__fgets_unlocked_chk_warn,
305 : (char *__restrict __s, size_t __size, int __n,
306 : FILE *__restrict __stream), __fgets_unlocked_chk)
307 : __wur __warnattr ("fgets_unlocked called with bigger size than length "
308 : "of destination buffer");
309 :
310 : __fortify_function __wur char *
311 : fgets_unlocked (char *__restrict __s, int __n, FILE *__restrict __stream)
312 : {
313 : if (__bos (__s) != (size_t) -1)
314 : {
315 : if (!__builtin_constant_p (__n) || __n <= 0)
316 : return __fgets_unlocked_chk (__s, __bos (__s), __n, __stream);
317 :
318 : if ((size_t) __n > __bos (__s))
319 : return __fgets_unlocked_chk_warn (__s, __bos (__s), __n, __stream);
320 : }
321 : return __fgets_unlocked_alias (__s, __n, __stream);
322 : }
323 : #endif
324 :
325 : #ifdef __USE_MISC
326 : # undef fread_unlocked
327 : extern size_t __fread_unlocked_chk (void *__restrict __ptr, size_t __ptrlen,
328 : size_t __size, size_t __n,
329 : FILE *__restrict __stream) __wur;
330 : extern size_t __REDIRECT (__fread_unlocked_alias,
331 : (void *__restrict __ptr, size_t __size,
332 : size_t __n, FILE *__restrict __stream),
333 : fread_unlocked) __wur;
334 : extern size_t __REDIRECT (__fread_unlocked_chk_warn,
335 : (void *__restrict __ptr, size_t __ptrlen,
336 : size_t __size, size_t __n,
337 : FILE *__restrict __stream),
338 : __fread_unlocked_chk)
339 : __wur __warnattr ("fread_unlocked called with bigger size * nmemb than "
340 : "length of destination buffer");
341 :
342 : __fortify_function __wur size_t
343 : fread_unlocked (void *__restrict __ptr, size_t __size, size_t __n,
344 : FILE *__restrict __stream)
345 : {
346 : if (__bos0 (__ptr) != (size_t) -1)
347 : {
348 : if (!__builtin_constant_p (__size)
349 : || !__builtin_constant_p (__n)
350 : || (__size | __n) >= (((size_t) 1) << (8 * sizeof (size_t) / 2)))
351 : return __fread_unlocked_chk (__ptr, __bos0 (__ptr), __size, __n,
352 : __stream);
353 :
354 : if (__size * __n > __bos0 (__ptr))
355 : return __fread_unlocked_chk_warn (__ptr, __bos0 (__ptr), __size, __n,
356 : __stream);
357 : }
358 :
359 : # ifdef __USE_EXTERN_INLINES
360 : if (__builtin_constant_p (__size)
361 : && __builtin_constant_p (__n)
362 : && (__size | __n) < (((size_t) 1) << (8 * sizeof (size_t) / 2))
363 : && __size * __n <= 8)
364 : {
365 : size_t __cnt = __size * __n;
366 : char *__cptr = (char *) __ptr;
367 : if (__cnt == 0)
368 : return 0;
369 :
370 : for (; __cnt > 0; --__cnt)
371 : {
372 : int __c = _IO_getc_unlocked (__stream);
373 : if (__c == EOF)
374 : break;
375 : *__cptr++ = __c;
376 : }
377 : return (__cptr - (char *) __ptr) / __size;
378 : }
379 : # endif
380 : return __fread_unlocked_alias (__ptr, __size, __n, __stream);
381 : }
382 : #endif
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