1 /* Copyright (C) 2004-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
19 # error "Never use <bits/string3.h> directly; include <string.h> instead."
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");
28 /* XXX This is temporarily. We should not redefine any of the symbols
29 and instead integrate the error checking into the original
49 __fortify_function
void *
50 __NTH (memcpy (void *__restrict __dest
, const void *__restrict __src
,
53 return __builtin___memcpy_chk (__dest
, __src
, __len
, __bos0 (__dest
));
56 __fortify_function
void *
57 __NTH (memmove (void *__dest
, const void *__src
, size_t __len
))
59 return __builtin___memmove_chk (__dest
, __src
, __len
, __bos0 (__dest
));
63 __fortify_function
void *
64 __NTH (mempcpy (void *__restrict __dest
, const void *__restrict __src
,
67 return __builtin___mempcpy_chk (__dest
, __src
, __len
, __bos0 (__dest
));
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
))
80 /* GCC-5.0 and newer implements these checks in the compiler, so we don't
82 #if !__GNUC_PREREQ (5,0)
83 if (__builtin_constant_p (__len
) && __len
== 0
84 && (!__builtin_constant_p (__ch
) || __ch
!= 0))
86 __warn_memset_zero_len ();
90 return __builtin___memset_chk (__dest
, __ch
, __len
, __bos0 (__dest
));
94 __fortify_function
void
95 __NTH (bcopy (const void *__src
, void *__dest
, size_t __len
))
97 (void) __builtin___memmove_chk (__dest
, __src
, __len
, __bos0 (__dest
));
100 __fortify_function
void
101 __NTH (bzero (void *__dest
, size_t __len
))
103 (void) __builtin___memset_chk (__dest
, '\0', __len
, __bos0 (__dest
));
107 __fortify_function
char *
108 __NTH (strcpy (char *__restrict __dest
, const char *__restrict __src
))
110 return __builtin___strcpy_chk (__dest
, __src
, __bos (__dest
));
114 __fortify_function
char *
115 __NTH (stpcpy (char *__restrict __dest
, const char *__restrict __src
))
117 return __builtin___stpcpy_chk (__dest
, __src
, __bos (__dest
));
122 __fortify_function
char *
123 __NTH (strncpy (char *__restrict __dest
, const char *__restrict __src
,
126 return __builtin___strncpy_chk (__dest
, __src
, __len
, __bos (__dest
));
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
);
135 __fortify_function
char *
136 __NTH (stpncpy (char *__dest
, const char *__src
, size_t __n
))
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
);
145 __fortify_function
char *
146 __NTH (strcat (char *__restrict __dest
, const char *__restrict __src
))
148 return __builtin___strcat_chk (__dest
, __src
, __bos (__dest
));
152 __fortify_function
char *
153 __NTH (strncat (char *__restrict __dest
, const char *__restrict __src
,
156 return __builtin___strncat_chk (__dest
, __src
, __len
, __bos (__dest
));