1 /* Checking macros for stdlib functions.
2 Copyright (C) 2005-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _STDLIB_H
20 # error "Never include <bits/stdlib.h> directly; use <stdlib.h> instead."
21 #endif
22
23 extern char *__realpath_chk (const char *__restrict __name,
24 char *__restrict __resolved,
25 size_t __resolvedlen) __THROW __wur;
26 extern char *__REDIRECT_NTH (__realpath_alias,
27 (const char *__restrict __name,
28 char *__restrict __resolved), realpath) __wur;
29 extern char *__REDIRECT_NTH (__realpath_chk_warn,
30 (const char *__restrict __name,
31 char *__restrict __resolved,
32 size_t __resolvedlen), __realpath_chk) __wur
33 __warnattr ("second argument of realpath must be either NULL or at "
34 "least PATH_MAX bytes long buffer");
35
36 __fortify_function __wur char *
__NTH(realpath (const char * __restrict __name,char * __restrict __resolved))37 __NTH (realpath (const char *__restrict __name, char *__restrict __resolved))
38 {
39 if (__glibc_objsize (__resolved) != (size_t) -1)
40 {
41 #if defined _LIBC_LIMITS_H_ && defined PATH_MAX
42 if (__glibc_objsize (__resolved) < PATH_MAX)
43 return __realpath_chk_warn (__name, __resolved,
44 __glibc_objsize (__resolved));
45 #endif
46 return __realpath_chk (__name, __resolved, __glibc_objsize (__resolved));
47 }
48
49 return __realpath_alias (__name, __resolved);
50 }
51
52
53 extern int __ptsname_r_chk (int __fd, char *__buf, size_t __buflen,
54 size_t __nreal) __THROW __nonnull ((2))
55 __attr_access ((__write_only__, 2, 3));
56 extern int __REDIRECT_NTH (__ptsname_r_alias, (int __fd, char *__buf,
57 size_t __buflen), ptsname_r)
58 __nonnull ((2)) __attr_access ((__write_only__, 2, 3));
59 extern int __REDIRECT_NTH (__ptsname_r_chk_warn,
60 (int __fd, char *__buf, size_t __buflen,
61 size_t __nreal), __ptsname_r_chk)
62 __nonnull ((2)) __warnattr ("ptsname_r called with buflen bigger than "
63 "size of buf");
64
65 __fortify_function int
__NTH(ptsname_r (int __fd,char * __buf,size_t __buflen))66 __NTH (ptsname_r (int __fd, char *__buf, size_t __buflen))
67 {
68 if (__glibc_objsize (__buf) != (size_t) -1)
69 {
70 if (!__builtin_constant_p (__buflen))
71 return __ptsname_r_chk (__fd, __buf, __buflen,
72 __glibc_objsize (__buf));
73 if (__buflen > __glibc_objsize (__buf))
74 return __ptsname_r_chk_warn (__fd, __buf, __buflen,
75 __glibc_objsize (__buf));
76 }
77 return __ptsname_r_alias (__fd, __buf, __buflen);
78 }
79
80
81 extern int __wctomb_chk (char *__s, wchar_t __wchar, size_t __buflen)
82 __THROW __wur;
83 extern int __REDIRECT_NTH (__wctomb_alias, (char *__s, wchar_t __wchar),
84 wctomb) __wur;
85
86 __fortify_function __wur int
__NTH(wctomb (char * __s,wchar_t __wchar))87 __NTH (wctomb (char *__s, wchar_t __wchar))
88 {
89 /* We would have to include <limits.h> to get a definition of MB_LEN_MAX.
90 But this would only disturb the namespace. So we define our own
91 version here. */
92 #define __STDLIB_MB_LEN_MAX 16
93 #if defined MB_LEN_MAX && MB_LEN_MAX != __STDLIB_MB_LEN_MAX
94 # error "Assumed value of MB_LEN_MAX wrong"
95 #endif
96 if (__glibc_objsize (__s) != (size_t) -1
97 && __STDLIB_MB_LEN_MAX > __glibc_objsize (__s))
98 return __wctomb_chk (__s, __wchar, __glibc_objsize (__s));
99 return __wctomb_alias (__s, __wchar);
100 }
101
102
103 extern size_t __mbstowcs_chk (wchar_t *__restrict __dst,
104 const char *__restrict __src,
105 size_t __len, size_t __dstlen) __THROW
106 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
107 extern size_t __REDIRECT_NTH (__mbstowcs_alias,
108 (wchar_t *__restrict __dst,
109 const char *__restrict __src,
110 size_t __len), mbstowcs)
111 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
112 extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn,
113 (wchar_t *__restrict __dst,
114 const char *__restrict __src,
115 size_t __len, size_t __dstlen), __mbstowcs_chk)
116 __warnattr ("mbstowcs called with dst buffer smaller than len "
117 "* sizeof (wchar_t)");
118
119 __fortify_function size_t
__NTH(mbstowcs (wchar_t * __restrict __dst,const char * __restrict __src,size_t __len))120 __NTH (mbstowcs (wchar_t *__restrict __dst, const char *__restrict __src,
121 size_t __len))
122 {
123 if (__glibc_objsize (__dst) != (size_t) -1)
124 {
125 if (!__builtin_constant_p (__len))
126 return __mbstowcs_chk (__dst, __src, __len,
127 __glibc_objsize (__dst) / sizeof (wchar_t));
128
129 if (__len > __glibc_objsize (__dst) / sizeof (wchar_t))
130 return __mbstowcs_chk_warn (__dst, __src, __len,
131 (__glibc_objsize (__dst)
132 / sizeof (wchar_t)));
133 }
134 return __mbstowcs_alias (__dst, __src, __len);
135 }
136
137
138 extern size_t __wcstombs_chk (char *__restrict __dst,
139 const wchar_t *__restrict __src,
140 size_t __len, size_t __dstlen) __THROW
141 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
142 extern size_t __REDIRECT_NTH (__wcstombs_alias,
143 (char *__restrict __dst,
144 const wchar_t *__restrict __src,
145 size_t __len), wcstombs)
146 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
147 extern size_t __REDIRECT_NTH (__wcstombs_chk_warn,
148 (char *__restrict __dst,
149 const wchar_t *__restrict __src,
150 size_t __len, size_t __dstlen), __wcstombs_chk)
151 __warnattr ("wcstombs called with dst buffer smaller than len");
152
153 __fortify_function size_t
__NTH(wcstombs (char * __restrict __dst,const wchar_t * __restrict __src,size_t __len))154 __NTH (wcstombs (char *__restrict __dst, const wchar_t *__restrict __src,
155 size_t __len))
156 {
157 if (__glibc_objsize (__dst) != (size_t) -1)
158 {
159 if (!__builtin_constant_p (__len))
160 return __wcstombs_chk (__dst, __src, __len, __glibc_objsize (__dst));
161 if (__len > __glibc_objsize (__dst))
162 return __wcstombs_chk_warn (__dst, __src, __len,
163 __glibc_objsize (__dst));
164 }
165 return __wcstombs_alias (__dst, __src, __len);
166 }