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1/* Copyright (C) 2004-2025 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 __attribute_overloadable__ char *
77__NTH (strcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
78 const char *__restrict __src))
79 __fortify_clang_warn_if_src_too_large (__dest, __src)
80{
81 return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
82}
83
84#ifdef __USE_XOPEN2K8
85__fortify_function __attribute_overloadable__ char *
86__NTH (stpcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
87 const char *__restrict __src))
88 __fortify_clang_warn_if_src_too_large (__dest, __src)
89{
90 return __builtin___stpcpy_chk (__dest, __src, __glibc_objsize (__dest));
91}
92#endif
93
94
95__fortify_function __attribute_overloadable__ char *
96__NTH (strncpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
97 const char *__restrict __src, size_t __len))
98 __fortify_clang_warn_if_dest_too_small (__dest, __len)
99{
100 return __builtin___strncpy_chk (__dest, __src, __len,
101 __glibc_objsize (__dest));
102}
103
104#ifdef __USE_XOPEN2K8
105# if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
106__fortify_function __attribute_overloadable__ char *
107__NTH (stpncpy (__fortify_clang_overload_arg (char *, ,__dest),
108 const char *__src, size_t __n))
109 __fortify_clang_warn_if_dest_too_small (__dest, __n)
110{
111 return __builtin___stpncpy_chk (__dest, __src, __n,
112 __glibc_objsize (__dest));
113}
114# else
115extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
116 size_t __destlen) __THROW
117 __fortified_attr_access (__write_only__, 1, 3)
118 __attr_access ((__read_only__, 2));
119extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
120 size_t __n), stpncpy);
121
122__fortify_function __attribute_overloadable__ char *
123__NTH (stpncpy (__fortify_clang_overload_arg (char *, ,__dest),
124 const char *__src, size_t __n))
125{
126 if (__bos (__dest) != (size_t) -1
127 && (!__builtin_constant_p (__n) || __n > __bos (__dest)))
128 return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
129 return __stpncpy_alias (__dest, __src, __n);
130}
131# endif
132#endif
133
134
135__fortify_function __attribute_overloadable__ char *
136__NTH (strcat (__fortify_clang_overload_arg (char *, __restrict, __dest),
137 const char *__restrict __src))
138 __fortify_clang_warn_if_src_too_large (__dest, __src)
139{
140 return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
141}
142
143
144__fortify_function __attribute_overloadable__ char *
145__NTH (strncat (__fortify_clang_overload_arg (char *, __restrict, __dest),
146 const char *__restrict __src, size_t __len))
147 __fortify_clang_warn_if_src_too_large (__dest, __src)
148{
149 return __builtin___strncat_chk (__dest, __src, __len,
150 __glibc_objsize (__dest));
151}
152
153/*
154 * zig patch: strlcpy and strlcat introduced in glibc 2.38
155 * https://sourceware.org/git/?p=glibc.git;a=commit;h=2e0bbbfbf95fc9e22692e93658a6fbdd2d4554da
156 */
157#if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 38) || __GLIBC__ > 2
158#ifdef __USE_MISC
159extern size_t __strlcpy_chk (char *__dest, const char *__src, size_t __n,
160 size_t __destlen) __THROW;
161extern size_t __REDIRECT_NTH (__strlcpy_alias,
162 (char *__dest, const char *__src, size_t __n),
163 strlcpy);
164
165__fortify_function __attribute_overloadable__ size_t
166__NTH (strlcpy (__fortify_clang_overload_arg (char *, __restrict, __dest),
167 const char *__restrict __src, size_t __n))
168 __fortify_clang_warn_if_dest_too_small (__dest, __n)
169{
170 if (__glibc_objsize (__dest) != (size_t) -1
171 && (!__builtin_constant_p (__n > __glibc_objsize (__dest))
172 || __n > __glibc_objsize (__dest)))
173 return __strlcpy_chk (__dest, __src, __n, __glibc_objsize (__dest));
174 return __strlcpy_alias (__dest, __src, __n);
175}
176
177extern size_t __strlcat_chk (char *__dest, const char *__src, size_t __n,
178 size_t __destlen) __THROW;
179extern size_t __REDIRECT_NTH (__strlcat_alias,
180 (char *__dest, const char *__src, size_t __n),
181 strlcat);
182
183__fortify_function __attribute_overloadable__ size_t
184__NTH (strlcat (__fortify_clang_overload_arg (char *, __restrict, __dest),
185 const char *__restrict __src, size_t __n))
186{
187 if (__glibc_objsize (__dest) != (size_t) -1
188 && (!__builtin_constant_p (__n > __glibc_objsize (__dest))
189 || __n > __glibc_objsize (__dest)))
190 return __strlcat_chk (__dest, __src, __n, __glibc_objsize (__dest));
191 return __strlcat_alias (__dest, __src, __n);
192}
193#endif /* __USE_MISC */
194#endif /* glibc v2.38 and later */
195
196#endif /* bits/string_fortified.h */