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1 : /* Copyright (C) 2004-2014 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 : __warndecl (__warn_memset_zero_len,
23 : "memset used with constant zero length parameter; this could be due to transposed parameters");
24 :
25 : #ifndef __cplusplus
26 : /* XXX This is temporarily. We should not redefine any of the symbols
27 : and instead integrate the error checking into the original
28 : definitions. */
29 : # undef memcpy
30 : # undef memmove
31 : # undef memset
32 : # undef strcat
33 : # undef strcpy
34 : # undef strncat
35 : # undef strncpy
36 : # ifdef __USE_GNU
37 : # undef mempcpy
38 : # undef stpcpy
39 : # endif
40 : # ifdef __USE_BSD
41 : # undef bcopy
42 : # undef bzero
43 : # endif
44 : #endif
45 :
46 :
47 : __fortify_function void *
48 : __NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
49 : size_t __len))
50 : {
51 31 : return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
52 : }
53 :
54 : __fortify_function void *
55 : __NTH (memmove (void *__dest, const void *__src, size_t __len))
56 : {
57 : return __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
58 : }
59 :
60 : #ifdef __USE_GNU
61 : __fortify_function void *
62 : __NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
63 : size_t __len))
64 : {
65 : return __builtin___mempcpy_chk (__dest, __src, __len, __bos0 (__dest));
66 : }
67 : #endif
68 :
69 :
70 : /* The first two tests here help to catch a somewhat common problem
71 : where the second and third parameter are transposed. This is
72 : especially problematic if the intended fill value is zero. In this
73 : case no work is done at all. We detect these problems by referring
74 : non-existing functions. */
75 : __fortify_function void *
76 : __NTH (memset (void *__dest, int __ch, size_t __len))
77 : {
78 : if (__builtin_constant_p (__len) && __len == 0
79 : && (!__builtin_constant_p (__ch) || __ch != 0))
80 : {
81 : __warn_memset_zero_len ();
82 : return __dest;
83 : }
84 154 : return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
85 : }
86 :
87 : #ifdef __USE_BSD
88 : __fortify_function void
89 : __NTH (bcopy (const void *__src, void *__dest, size_t __len))
90 : {
91 : (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
92 : }
93 :
94 : __fortify_function void
95 : __NTH (bzero (void *__dest, size_t __len))
96 : {
97 : (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
98 : }
99 : #endif
100 :
101 : __fortify_function char *
102 : __NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
103 : {
104 0 : return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
105 : }
106 :
107 : #ifdef __USE_GNU
108 : __fortify_function char *
109 : __NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
110 : {
111 : return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
112 : }
113 : #endif
114 :
115 :
116 : __fortify_function char *
117 : __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
118 : size_t __len))
119 : {
120 23 : return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
121 : }
122 :
123 : // XXX We have no corresponding builtin yet.
124 : extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
125 : size_t __destlen) __THROW;
126 : extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
127 : size_t __n), stpncpy);
128 :
129 : __fortify_function char *
130 : __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
131 : {
132 : if (__bos (__dest) != (size_t) -1
133 : && (!__builtin_constant_p (__n) || __n <= __bos (__dest)))
134 : return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
135 : return __stpncpy_alias (__dest, __src, __n);
136 : }
137 :
138 :
139 : __fortify_function char *
140 : __NTH (strcat (char *__restrict __dest, const char *__restrict __src))
141 : {
142 : return __builtin___strcat_chk (__dest, __src, __bos (__dest));
143 : }
144 :
145 :
146 : __fortify_function char *
147 : __NTH (strncat (char *__restrict __dest, const char *__restrict __src,
148 : size_t __len))
149 : {
150 : return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
151 : }
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