1/* Checking macros for stdlib functions.
2 Copyright (C) 2005-2020 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
23extern char *__realpath_chk (const char *__restrict __name,
24 char *__restrict __resolved,
25 size_t __resolvedlen) __THROW __wur;
26extern char *__REDIRECT_NTH (__realpath_alias,
27 (const char *__restrict __name,
28 char *__restrict __resolved), realpath) __wur;
29extern 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 if (__bos (__resolved) != (size_t) -1)
40 {
41#if defined _LIBC_LIMITS_H_ && defined PATH_MAX
42 if (__bos (__resolved) < PATH_MAX)
43 return __realpath_chk_warn (__name, __resolved, __bos (__resolved));
44#endif
45 return __realpath_chk (__name, __resolved, __bos (__resolved));
46 }
47
48 return __realpath_alias (__name, __resolved);
49}
50
51
52extern 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));
55extern 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));
58extern 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 if (__bos (__buf) != (size_t) -1)
68 {
69 if (!__builtin_constant_p (__buflen))
70 return __ptsname_r_chk (__fd, __buf, __buflen, __bos (__buf));
71 if (__buflen > __bos (__buf))
72 return __ptsname_r_chk_warn (__fd, __buf, __buflen, __bos (__buf));
73 }
74 return __ptsname_r_alias (__fd, __buf, __buflen);
75}
76
77
78extern int __wctomb_chk (char *__s, wchar_t __wchar, size_t __buflen)
79 __THROW __wur;
80extern int __REDIRECT_NTH (__wctomb_alias, (char *__s, wchar_t __wchar),
81 wctomb) __wur;
82
83__fortify_function __wur int
84__NTH (wctomb (char *__s, wchar_t __wchar))
85{
86 /* We would have to include <limits.h> to get a definition of MB_LEN_MAX.
87 But this would only disturb the namespace. So we define our own
88 version here. */
89#define __STDLIB_MB_LEN_MAX 16
90#if defined MB_LEN_MAX && MB_LEN_MAX != __STDLIB_MB_LEN_MAX
91# error "Assumed value of MB_LEN_MAX wrong"
92#endif
93 if (__bos (__s) != (size_t) -1 && __STDLIB_MB_LEN_MAX > __bos (__s))
94 return __wctomb_chk (__s, __wchar, __bos (__s));
95 return __wctomb_alias (__s, __wchar);
96}
97
98
99extern size_t __mbstowcs_chk (wchar_t *__restrict __dst,
100 const char *__restrict __src,
101 size_t __len, size_t __dstlen) __THROW
102 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
103extern size_t __REDIRECT_NTH (__mbstowcs_alias,
104 (wchar_t *__restrict __dst,
105 const char *__restrict __src,
106 size_t __len), mbstowcs)
107 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
108extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn,
109 (wchar_t *__restrict __dst,
110 const char *__restrict __src,
111 size_t __len, size_t __dstlen), __mbstowcs_chk)
112 __warnattr ("mbstowcs called with dst buffer smaller than len "
113 "* sizeof (wchar_t)");
114
115__fortify_function size_t
116__NTH (mbstowcs (wchar_t *__restrict __dst, const char *__restrict __src,
117 size_t __len))
118{
119 if (__bos (__dst) != (size_t) -1)
120 {
121 if (!__builtin_constant_p (__len))
122 return __mbstowcs_chk (__dst, __src, __len,
123 __bos (__dst) / sizeof (wchar_t));
124
125 if (__len > __bos (__dst) / sizeof (wchar_t))
126 return __mbstowcs_chk_warn (__dst, __src, __len,
127 __bos (__dst) / sizeof (wchar_t));
128 }
129 return __mbstowcs_alias (__dst, __src, __len);
130}
131
132
133extern size_t __wcstombs_chk (char *__restrict __dst,
134 const wchar_t *__restrict __src,
135 size_t __len, size_t __dstlen) __THROW
136 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
137extern size_t __REDIRECT_NTH (__wcstombs_alias,
138 (char *__restrict __dst,
139 const wchar_t *__restrict __src,
140 size_t __len), wcstombs)
141 __attr_access ((__write_only__, 1, 3)) __attr_access ((__read_only__, 2));
142extern size_t __REDIRECT_NTH (__wcstombs_chk_warn,
143 (char *__restrict __dst,
144 const wchar_t *__restrict __src,
145 size_t __len, size_t __dstlen), __wcstombs_chk)
146 __warnattr ("wcstombs called with dst buffer smaller than len");
147
148__fortify_function size_t
149__NTH (wcstombs (char *__restrict __dst, const wchar_t *__restrict __src,
150 size_t __len))
151{
152 if (__bos (__dst) != (size_t) -1)
153 {
154 if (!__builtin_constant_p (__len))
155 return __wcstombs_chk (__dst, __src, __len, __bos (__dst));
156 if (__len > __bos (__dst))
157 return __wcstombs_chk_warn (__dst, __src, __len, __bos (__dst));
158 }
159 return __wcstombs_alias (__dst, __src, __len);
160}
161