stdlib/bits/stdlib.h

   1 /* Checking macros for stdlib functions.
   2    Copyright (C) 2005-2017 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    <http://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   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
  52 extern int __ptsname_r_chk (int __fd, char *__buf, size_t __buflen,
  53                             size_t __nreal) __THROW __nonnull ((2));
  54 extern int __REDIRECT_NTH (__ptsname_r_alias, (int __fd, char *__buf,
  55                                                size_t __buflen), ptsname_r)
  56      __nonnull ((2));
  57 extern int __REDIRECT_NTH (__ptsname_r_chk_warn,
  58                            (int __fd, char *__buf, size_t __buflen,
  59                             size_t __nreal), __ptsname_r_chk)
  60      __nonnull ((2)) __warnattr ("ptsname_r called with buflen bigger than "
  61                                  "size of buf");
  62
  63 __fortify_function int
  64 __NTH (ptsname_r (int __fd, char *__buf, size_t __buflen))
  65 {
  66   if (__bos (__buf) != (size_t) -1)
  67     {
  68       if (!__builtin_constant_p (__buflen))
  69         return __ptsname_r_chk (__fd, __buf, __buflen, __bos (__buf));
  70       if (__buflen > __bos (__buf))
  71         return __ptsname_r_chk_warn (__fd, __buf, __buflen, __bos (__buf));
  72     }
  73   return __ptsname_r_alias (__fd, __buf, __buflen);
  74 }
  75
  76
  77 extern int __wctomb_chk (char *__s, wchar_t __wchar, size_t __buflen)
  78   __THROW __wur;
  79 extern int __REDIRECT_NTH (__wctomb_alias, (char *__s, wchar_t __wchar),
  80                            wctomb) __wur;
  81
  82 __fortify_function __wur int
  83 __NTH (wctomb (char *__s, wchar_t __wchar))
  84 {
  85   /* We would have to include <limits.h> to get a definition of MB_LEN_MAX.
  86      But this would only disturb the namespace.  So we define our own
  87      version here.  */
  88 #define __STDLIB_MB_LEN_MAX     16
  89 #if defined MB_LEN_MAX && MB_LEN_MAX != __STDLIB_MB_LEN_MAX
  90 # error "Assumed value of MB_LEN_MAX wrong"
  91 #endif
  92   if (__bos (__s) != (size_t) -1 && __STDLIB_MB_LEN_MAX > __bos (__s))
  93     return __wctomb_chk (__s, __wchar, __bos (__s));
  94   return __wctomb_alias (__s, __wchar);
  95 }
  96
  97
  98 extern size_t __mbstowcs_chk (wchar_t *__restrict __dst,
  99                               const char *__restrict __src,
 100                               size_t __len, size_t __dstlen) __THROW;
 101 extern size_t __REDIRECT_NTH (__mbstowcs_alias,
 102                               (wchar_t *__restrict __dst,
 103                                const char *__restrict __src,
 104                                size_t __len), mbstowcs);
 105 extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn,
 106                               (wchar_t *__restrict __dst,
 107                                const char *__restrict __src,
 108                                size_t __len, size_t __dstlen), __mbstowcs_chk)
 109      __warnattr ("mbstowcs called with dst buffer smaller than len "
 110                  "* sizeof (wchar_t)");
 111
 112 __fortify_function size_t
 113 __NTH (mbstowcs (wchar_t *__restrict __dst, const char *__restrict __src,
 114                  size_t __len))
 115 {
 116   if (__bos (__dst) != (size_t) -1)
 117     {
 118       if (!__builtin_constant_p (__len))
 119         return __mbstowcs_chk (__dst, __src, __len,
 120                                __bos (__dst) / sizeof (wchar_t));
 121
 122       if (__len > __bos (__dst) / sizeof (wchar_t))
 123         return __mbstowcs_chk_warn (__dst, __src, __len,
 124                                      __bos (__dst) / sizeof (wchar_t));
 125     }
 126   return __mbstowcs_alias (__dst, __src, __len);
 127 }
 128
 129
 130 extern size_t __wcstombs_chk (char *__restrict __dst,
 131                               const wchar_t *__restrict __src,
 132                               size_t __len, size_t __dstlen) __THROW;
 133 extern size_t __REDIRECT_NTH (__wcstombs_alias,
 134                               (char *__restrict __dst,
 135                                const wchar_t *__restrict __src,
 136                                size_t __len), wcstombs);
 137 extern size_t __REDIRECT_NTH (__wcstombs_chk_warn,
 138                               (char *__restrict __dst,
 139                                const wchar_t *__restrict __src,
 140                                size_t __len, size_t __dstlen), __wcstombs_chk)
 141      __warnattr ("wcstombs called with dst buffer smaller than len");
 142
 143 __fortify_function size_t
 144 __NTH (wcstombs (char *__restrict __dst, const wchar_t *__restrict __src,
 145                  size_t __len))
 146 {
 147   if (__bos (__dst) != (size_t) -1)
 148     {
 149       if (!__builtin_constant_p (__len))
 150         return __wcstombs_chk (__dst, __src, __len, __bos (__dst));
 151       if (__len > __bos (__dst))
 152         return __wcstombs_chk_warn (__dst, __src, __len, __bos (__dst));
 153     }
 154   return __wcstombs_alias (__dst, __src, __len);
 155 }