1/* Copyright (C) 2004-2016 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 <http://www.gnu.org/licenses/>. */
17
18#ifndef _STRING_H
19# error "Never use <bits/string3.h> directly; include <string.h> instead."
20#endif
21
22#if !__GNUC_PREREQ (5,0)
23__warndecl (__warn_memset_zero_len,
24 "memset used with constant zero length parameter; this could be due to transposed parameters");
25#endif
26
27#ifndef __cplusplus
28/* XXX This is temporarily. We should not redefine any of the symbols
29 and instead integrate the error checking into the original
30 definitions. */
31# undef memcpy
32# undef memmove
33# undef memset
34# undef strcat
35# undef strcpy
36# undef strncat
37# undef strncpy
38# ifdef __USE_GNU
39# undef mempcpy
40# undef stpcpy
41# endif
42# ifdef __USE_MISC
43# undef bcopy
44# undef bzero
45# endif
46#endif
47
48
49__fortify_function void *
50__NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
51 size_t __len))
52{
53 return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
54}
55
56__fortify_function void *
57__NTH (memmove (void *__dest, const void *__src, size_t __len))
58{
59 return __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
60}
61
62#ifdef __USE_GNU
63__fortify_function void *
64__NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
65 size_t __len))
66{
67 return __builtin___mempcpy_chk (__dest, __src, __len, __bos0 (__dest));
68}
69#endif
70
71
72/* The first two tests here help to catch a somewhat common problem
73 where the second and third parameter are transposed. This is
74 especially problematic if the intended fill value is zero. In this
75 case no work is done at all. We detect these problems by referring
76 non-existing functions. */
77__fortify_function void *
78__NTH (memset (void *__dest, int __ch, size_t __len))
79{
80 /* GCC-5.0 and newer implements these checks in the compiler, so we don't
81 need them here. */
82#if !__GNUC_PREREQ (5,0)
83 if (__builtin_constant_p (__len) && __len == 0
84 && (!__builtin_constant_p (__ch) || __ch != 0))
85 {
86 __warn_memset_zero_len ();
87 return __dest;
88 }
89#endif
90 return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
91}
92
93#ifdef __USE_MISC
94__fortify_function void
95__NTH (bcopy (const void *__src, void *__dest, size_t __len))
96{
97 (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
98}
99
100__fortify_function void
101__NTH (bzero (void *__dest, size_t __len))
102{
103 (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
104}
105#endif
106
107__fortify_function char *
108__NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
109{
110 return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
111}
112
113#ifdef __USE_GNU
114__fortify_function char *
115__NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
116{
117 return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
118}
119#endif
120
121
122__fortify_function char *
123__NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
124 size_t __len))
125{
126 return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
127}
128
129// XXX We have no corresponding builtin yet.
130extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
131 size_t __destlen) __THROW;
132extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
133 size_t __n), stpncpy);
134
135__fortify_function char *
136__NTH (stpncpy (char *__dest, const char *__src, size_t __n))
137{
138 if (__bos (__dest) != (size_t) -1
139 && (!__builtin_constant_p (__n) || __n > __bos (__dest)))
140 return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
141 return __stpncpy_alias (__dest, __src, __n);
142}
143
144
145__fortify_function char *
146__NTH (strcat (char *__restrict __dest, const char *__restrict __src))
147{
148 return __builtin___strcat_chk (__dest, __src, __bos (__dest));
149}
150
151
152__fortify_function char *
153__NTH (strncat (char *__restrict __dest, const char *__restrict __src,
154 size_t __len))
155{
156 return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
157}
158