1/* Copyright (C) 2004-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _BITS_STRING_FORTIFIED_H
19#define _BITS_STRING_FORTIFIED_H 1
20
21#ifndef _STRING_H
22# error "Never use <bits/string_fortified.h> directly; include <string.h> instead."
23#endif
24
25__fortify_function void *
26__NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
27 size_t __len))
28{
29 return __builtin___memcpy_chk (__dest, __src, __len,
30 __glibc_objsize0 (__dest));
31}
32
33__fortify_function void *
34__NTH (memmove (void *__dest, const void *__src, size_t __len))
35{
36 return __builtin___memmove_chk (__dest, __src, __len,
37 __glibc_objsize0 (__dest));
38}
39
40#ifdef __USE_GNU
41__fortify_function void *
42__NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
43 size_t __len))
44{
45 return __builtin___mempcpy_chk (__dest, __src, __len,
46 __glibc_objsize0 (__dest));
47}
48#endif
49
50
51/* The first two tests here help to catch a somewhat common problem
52 where the second and third parameter are transposed. This is
53 especially problematic if the intended fill value is zero. In this
54 case no work is done at all. We detect these problems by referring
55 non-existing functions. */
56__fortify_function void *
57__NTH (memset (void *__dest, int __ch, size_t __len))
58{
59 return __builtin___memset_chk (__dest, __ch, __len,
60 __glibc_objsize0 (__dest));
61}
62
63#ifdef __USE_MISC
64# include <bits/strings_fortified.h>
65
66void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
67 __THROW __nonnull ((1)) __fortified_attr_access (__write_only__, 1, 2);
68
69__fortify_function void
70__NTH (explicit_bzero (void *__dest, size_t __len))
71{
72 __explicit_bzero_chk (__dest, __len, __glibc_objsize0 (__dest));
73}
74#endif
75
76__fortify_function char *
77__NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
78{
79 return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
80}
81
82#ifdef __USE_XOPEN2K8
83__fortify_function char *
84__NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
85{
86 return __builtin___stpcpy_chk (__dest, __src, __glibc_objsize (__dest));
87}
88#endif
89
90
91__fortify_function char *
92__NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
93 size_t __len))
94{
95 return __builtin___strncpy_chk (__dest, __src, __len,
96 __glibc_objsize (__dest));
97}
98
99#ifdef __USE_XOPEN2K8
100# if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
101__fortify_function char *
102__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
103{
104 return __builtin___stpncpy_chk (__dest, __src, __n,
105 __glibc_objsize (__dest));
106}
107# else
108extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
109 size_t __destlen) __THROW
110 __fortified_attr_access ((__write_only__, 1, 3))
111 __attr_access ((__read_only__, 2));
112extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
113 size_t __n), stpncpy);
114
115__fortify_function char *
116__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
117{
118 if (__bos (__dest) != (size_t) -1
119 && (!__builtin_constant_p (__n) || __n > __bos (__dest)))
120 return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
121 return __stpncpy_alias (__dest, __src, __n);
122}
123# endif
124#endif
125
126
127__fortify_function char *
128__NTH (strcat (char *__restrict __dest, const char *__restrict __src))
129{
130 return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
131}
132
133
134__fortify_function char *
135__NTH (strncat (char *__restrict __dest, const char *__restrict __src,
136 size_t __len))
137{
138 return __builtin___strncat_chk (__dest, __src, __len,
139 __glibc_objsize (__dest));
140}
141
142#endif /* bits/string_fortified.h */
143