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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 31 : 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
90 169 : 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 0 : 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 29 : return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
127 : }
128 :
129 : // XXX We have no corresponding builtin yet.
130 : extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
131 : size_t __destlen) __THROW;
132 : extern 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 : }
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