1 /* Copyright (C) 2004, 2005, 2007 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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
18
19 #ifndef _STRING_H
20 # error "Never use <bits/string3.h> directly; include <string.h> instead."
21 #endif
22
23 __warndecl (__warn_memset_zero_len,
24 "memset used with constant zero length parameter; this could be due to transposed parameters");
25
26 #ifndef __cplusplus
27 /* XXX This is temporarily. We should not redefine any of the symbols
28 and instead integrate the error checking into the original
29 definitions. */
30 # undef memcpy
31 # undef memmove
32 # undef memset
33 # undef strcat
34 # undef strcpy
35 # undef strncat
36 # undef strncpy
37 # ifdef __USE_GNU
38 # undef mempcpy
39 # undef stpcpy
40 # endif
41 # ifdef __USE_BSD
42 # undef bcopy
43 # undef bzero
44 # endif
45 #endif
46
47
48 __extern_always_inline void *
__NTH(memcpy (void * __restrict __dest,__const void * __restrict __src,size_t __len))49 __NTH (memcpy (void *__restrict __dest, __const void *__restrict __src,
50 size_t __len))
51 {
52 return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
53 }
54
55 __extern_always_inline void *
__NTH(memmove (void * __restrict __dest,__const void * __restrict __src,size_t __len))56 __NTH (memmove (void *__restrict __dest, __const void *__restrict __src,
57 size_t __len))
58 {
59 return __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
60 }
61
62 #ifdef __USE_GNU
63 __extern_always_inline void *
__NTH(mempcpy (void * __restrict __dest,__const void * __restrict __src,size_t __len))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 __extern_always_inline void *
__NTH(memset (void * __dest,int __ch,size_t __len))78 __NTH (memset (void *__dest, int __ch, size_t __len))
79 {
80 if (__builtin_constant_p (__len) && __len == 0)
81 {
82 __warn_memset_zero_len ();
83 return __dest;
84 }
85 return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
86 }
87
88 #ifdef __USE_BSD
89 __extern_always_inline void
__NTH(bcopy (__const void * __restrict __src,void * __restrict __dest,size_t __len))90 __NTH (bcopy (__const void *__restrict __src, void *__restrict __dest,
91 size_t __len))
92 {
93 (void) __builtin___memmove_chk (__dest, __src, __len, __bos0 (__dest));
94 }
95
96 __extern_always_inline void
__NTH(bzero (void * __dest,size_t __len))97 __NTH (bzero (void *__dest, size_t __len))
98 {
99 (void) __builtin___memset_chk (__dest, '\0', __len, __bos0 (__dest));
100 }
101 #endif
102
103 __extern_always_inline char *
__NTH(strcpy (char * __restrict __dest,__const char * __restrict __src))104 __NTH (strcpy (char *__restrict __dest, __const char *__restrict __src))
105 {
106 return __builtin___strcpy_chk (__dest, __src, __bos (__dest));
107 }
108
109 #ifdef __USE_GNU
110 __extern_always_inline char *
__NTH(stpcpy (char * __restrict __dest,__const char * __restrict __src))111 __NTH (stpcpy (char *__restrict __dest, __const char *__restrict __src))
112 {
113 return __builtin___stpcpy_chk (__dest, __src, __bos (__dest));
114 }
115 #endif
116
117
118 __extern_always_inline char *
__NTH(strncpy (char * __restrict __dest,__const char * __restrict __src,size_t __len))119 __NTH (strncpy (char *__restrict __dest, __const char *__restrict __src,
120 size_t __len))
121 {
122 return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
123 }
124
125 // XXX We have no corresponding builtin yet.
126 extern char *__stpncpy_chk (char *__dest, __const char *__src, size_t __n,
127 size_t __destlen) __THROW;
128 extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest,
129 __const char *__src,
130 size_t __n), stpncpy);
131
132 __extern_always_inline char *
__NTH(stpncpy (char * __dest,__const char * __src,size_t __n))133 __NTH (stpncpy (char *__dest, __const char *__src, size_t __n))
134 {
135 if (__bos (__dest) != (size_t) -1
136 && (!__builtin_constant_p (__n) || __n <= __bos (__dest)))
137 return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
138 return __stpncpy_alias (__dest, __src, __n);
139 }
140
141
142 __extern_always_inline char *
__NTH(strcat (char * __restrict __dest,__const char * __restrict __src))143 __NTH (strcat (char *__restrict __dest, __const char *__restrict __src))
144 {
145 return __builtin___strcat_chk (__dest, __src, __bos (__dest));
146 }
147
148
149 __extern_always_inline char *
__NTH(strncat (char * __restrict __dest,__const char * __restrict __src,size_t __len))150 __NTH (strncat (char *__restrict __dest, __const char *__restrict __src,
151 size_t __len))
152 {
153 return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
154 }
155