1 /* Checking macros for stdlib functions.
2 Copyright (C) 2005-2023 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 *
37 __NTH (realpath (const char *__restrict __name, char *__restrict __resolved))
38 {
39 size_t sz = __glibc_objsize (__resolved);
40
41 if (sz == (size_t) -1)
42 return __realpath_alias (__name, __resolved);
43
44 #if defined _LIBC_LIMITS_H_ && defined PATH_MAX
45 if (__glibc_unsafe_len (PATH_MAX, sizeof (char), sz))
46 return __realpath_chk_warn (__name, __resolved, sz);
47 #endif
48 return __realpath_chk (__name, __resolved, sz);
49 }
50
51
52 extern int __ptsname_r_chk (int __fd, char *__buf, size_t __buflen,
53 size_t __nreal) __THROW __nonnull ((2))
54 __attr_access ((__write_only__, 2, 3));
55 extern int __REDIRECT_NTH (__ptsname_r_alias, (int __fd, char *__buf,
56 size_t __buflen), ptsname_r)
57 __nonnull ((2)) __attr_access ((__write_only__, 2, 3));
58 extern int __REDIRECT_NTH (__ptsname_r_chk_warn,
59 (int __fd, char *__buf, size_t __buflen,
60 size_t __nreal), __ptsname_r_chk)
61 __nonnull ((2)) __warnattr ("ptsname_r called with buflen bigger than "
62 "size of buf");
63
64 __fortify_function int
65 __NTH (ptsname_r (int __fd, char *__buf, size_t __buflen))
66 {
67 return __glibc_fortify (ptsname_r, __buflen, sizeof (char),
68 __glibc_objsize (__buf),
69 __fd, __buf, __buflen);
70 }
71
72
73 extern int __wctomb_chk (char *__s, wchar_t __wchar, size_t __buflen)
74 __THROW __wur;
75 extern int __REDIRECT_NTH (__wctomb_alias, (char *__s, wchar_t __wchar),
76 wctomb) __wur;
77
78 __fortify_function __wur int
79 __NTH (wctomb (char *__s, wchar_t __wchar))
80 {
81 /* We would have to include <limits.h> to get a definition of MB_LEN_MAX.
82 But this would only disturb the namespace. So we define our own
83 version here. */
84 #define __STDLIB_MB_LEN_MAX 16
85 #if defined MB_LEN_MAX && MB_LEN_MAX != __STDLIB_MB_LEN_MAX
86 # error "Assumed value of MB_LEN_MAX wrong"
87 #endif
88 if (__glibc_objsize (__s) != (size_t) -1
89 && __STDLIB_MB_LEN_MAX > __glibc_objsize (__s))
90 return __wctomb_chk (__s, __wchar, __glibc_objsize (__s));
91 return __wctomb_alias (__s, __wchar);
92 }
93
94
95 extern size_t __mbstowcs_chk (wchar_t *__restrict __dst,
96 const char *__restrict __src,
97 size_t __len, size_t __dstlen) __THROW
98 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
99 extern size_t __REDIRECT_NTH (__mbstowcs_nulldst,
100 (wchar_t *__restrict __dst,
101 const char *__restrict __src,
102 size_t __len), mbstowcs)
103 __attr_access ((__read_only__, 2));
104 extern size_t __REDIRECT_NTH (__mbstowcs_alias,
105 (wchar_t *__restrict __dst,
106 const char *__restrict __src,
107 size_t __len), mbstowcs)
108 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
109 extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn,
110 (wchar_t *__restrict __dst,
111 const char *__restrict __src,
112 size_t __len, size_t __dstlen), __mbstowcs_chk)
113 __warnattr ("mbstowcs called with dst buffer smaller than len "
114 "* sizeof (wchar_t)");
115
116 __fortify_function size_t
117 __NTH (mbstowcs (wchar_t *__restrict __dst, const char *__restrict __src,
118 size_t __len))
119 {
120 if (__builtin_constant_p (__dst == NULL) && __dst == NULL)
121 return __mbstowcs_nulldst (__dst, __src, __len);
122 else
123 return __glibc_fortify_n (mbstowcs, __len, sizeof (wchar_t),
124 __glibc_objsize (__dst), __dst, __src, __len);
125 }
126
127 extern size_t __wcstombs_chk (char *__restrict __dst,
128 const wchar_t *__restrict __src,
129 size_t __len, size_t __dstlen) __THROW
130 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
131 extern size_t __REDIRECT_NTH (__wcstombs_alias,
132 (char *__restrict __dst,
133 const wchar_t *__restrict __src,
134 size_t __len), wcstombs)
135 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
136 extern size_t __REDIRECT_NTH (__wcstombs_chk_warn,
137 (char *__restrict __dst,
138 const wchar_t *__restrict __src,
139 size_t __len, size_t __dstlen), __wcstombs_chk)
140 __warnattr ("wcstombs called with dst buffer smaller than len");
141
142 __fortify_function size_t
143 __NTH (wcstombs (char *__restrict __dst, const wchar_t *__restrict __src,
144 size_t __len))
145 {
146 return __glibc_fortify (wcstombs, __len, sizeof (char),
147 __glibc_objsize (__dst),
148 __dst, __src, __len);
149 }