stdlib/bits/stdlib.h

   1 /* Checking macros for stdlib functions.
   2    Copyright (C) 2005, 2007 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _STDLIB_H
  21 # error "Never include <bits/stdlib.h> directly; use <stdlib.h> instead."
  22 #endif
  23
  24 extern char *__realpath_chk (__const char *__restrict __name,
  25                              char *__restrict __resolved,
  26                              size_t __resolvedlen) __THROW __wur;
  27 extern char *__REDIRECT_NTH (__realpath_alias,
  28                              (__const char *__restrict __name,
  29                               char *__restrict __resolved), realpath) __wur;
  30 extern char *__REDIRECT_NTH (__realpath_chk_warn,
  31                              (__const char *__restrict __name,
  32                               char *__restrict __resolved,
  33                               size_t __resolvedlen), __realpath_chk) __wur
  34      __warnattr ("second argument of realpath must be either NULL or at "
  35                  "least PATH_MAX bytes long buffer");
  36
  37 __extern_always_inline __wur char *
  38 __NTH (realpath (__const char *__restrict __name, char *__restrict __resolved))
  39 {
  40   if (__bos (__resolved) != (size_t) -1)
  41     {
  42 #if defined _LIBC_LIMITS_H_ && defined PATH_MAX
  43       if (__bos (__resolved) < PATH_MAX)
  44         return __realpath_chk_warn (__name, __resolved, __bos (__resolved));
  45 #endif
  46       return __realpath_chk (__name, __resolved, __bos (__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 extern int __REDIRECT_NTH (__ptsname_r_alias, (int __fd, char *__buf,
  56                                                size_t __buflen), ptsname_r)
  57      __nonnull ((2));
  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 __extern_always_inline 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
  78 extern int __wctomb_chk (char *__s, wchar_t __wchar, size_t __buflen)
  79   __THROW __wur;
  80 extern int __REDIRECT_NTH (__wctomb_alias, (char *__s, wchar_t __wchar),
  81                            wctomb) __wur;
  82
  83 __extern_always_inline __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
  99 extern size_t __mbstowcs_chk (wchar_t *__restrict __dst,
 100                               __const char *__restrict __src,
 101                               size_t __len, size_t __dstlen) __THROW;
 102 extern size_t __REDIRECT_NTH (__mbstowcs_alias,
 103                               (wchar_t *__restrict __dst,
 104                                __const char *__restrict __src,
 105                                size_t __len), mbstowcs);
 106 extern size_t __REDIRECT_NTH (__mbstowcs_chk_warn,
 107                               (wchar_t *__restrict __dst,
 108                                __const char *__restrict __src,
 109                                size_t __len, size_t __dstlen), __mbstowcs_chk)
 110      __warnattr ("mbstowcs called with dst buffer smaller than len "
 111                  "* sizeof (wchar_t)");
 112
 113 __extern_always_inline size_t
 114 __NTH (mbstowcs (wchar_t *__restrict __dst, __const char *__restrict __src,
 115                  size_t __len))
 116 {
 117   if (__bos (__dst) != (size_t) -1)
 118     {
 119       if (!__builtin_constant_p (__len))
 120         return __mbstowcs_chk (__dst, __src, __len,
 121                                __bos (__dst) / sizeof (wchar_t));
 122
 123       if (__len > __bos (__dst) / sizeof (wchar_t))
 124         return __mbstowcs_chk_warn (__dst, __src, __len,
 125                                      __bos (__dst) / sizeof (wchar_t));
 126     }
 127   return __mbstowcs_alias (__dst, __src, __len);
 128 }
 129
 130
 131 extern size_t __wcstombs_chk (char *__restrict __dst,
 132                               __const wchar_t *__restrict __src,
 133                               size_t __len, size_t __dstlen) __THROW;
 134 extern size_t __REDIRECT_NTH (__wcstombs_alias,
 135                               (char *__restrict __dst,
 136                                __const wchar_t *__restrict __src,
 137                                size_t __len), wcstombs);
 138 extern size_t __REDIRECT_NTH (__wcstombs_chk_warn,
 139                               (char *__restrict __dst,
 140                                __const wchar_t *__restrict __src,
 141                                size_t __len, size_t __dstlen), __wcstombs_chk)
 142      __warnattr ("wcstombs called with dst buffer smaller than len");
 143
 144 __extern_always_inline size_t
 145 __NTH (wcstombs (char *__restrict __dst, __const wchar_t *__restrict __src,
 146                  size_t __len))
 147 {
 148   if (__bos (__dst) != (size_t) -1)
 149     {
 150       if (!__builtin_constant_p (__len))
 151         return __wcstombs_chk (__dst, __src, __len, __bos (__dst));
 152       if (__len > __bos (__dst))
 153         return __wcstombs_chk_warn (__dst, __src, __len, __bos (__dst));
 154     }
 155   return __wcstombs_alias (__dst, __src, __len);
 156 }