contrib/grep/lib/fstat.c

   1 /* fstat() replacement.
   2    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* If the user's config.h happens to include <sys/stat.h>, let it include only
  18    the system's <sys/stat.h> here, so that orig_fstat doesn't recurse to
  19    rpl_fstat.  */
  20 #define __need_system_sys_stat_h
  21 #include <config.h>
  22
  23 /* Get the original definition of fstat.  It might be defined as a macro.  */
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #if _GL_WINDOWS_64_BIT_ST_SIZE
  27 # undef stat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */
  28 # define stat _stati64
  29 # undef fstat /* avoid warning on mingw64 with _FILE_OFFSET_BITS=64 */
  30 # define fstat _fstati64
  31 #endif
  32 #undef __need_system_sys_stat_h
  33
  34 static int
  35 orig_fstat (int fd, struct stat *buf)
  36 {
  37   return fstat (fd, buf);
  38 }
  39
  40 /* Specification.  */
  41 /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
  42    eliminates this include because of the preliminary #include <sys/stat.h>
  43    above.  */
  44 #include "sys/stat.h"
  45
  46 #include <errno.h>
  47 #include <unistd.h>
  48
  49 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  50 # include "msvc-inval.h"
  51 #endif
  52
  53 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  54 static int
  55 fstat_nothrow (int fd, struct stat *buf)
  56 {
  57   int result;
  58
  59   TRY_MSVC_INVAL
  60     {
  61       result = orig_fstat (fd, buf);
  62     }
  63   CATCH_MSVC_INVAL
  64     {
  65       result = -1;
  66       errno = EBADF;
  67     }
  68   DONE_MSVC_INVAL;
  69
  70   return result;
  71 }
  72 #else
  73 # define fstat_nothrow orig_fstat
  74 #endif
  75
  76 int
  77 rpl_fstat (int fd, struct stat *buf)
  78 {
  79 #if REPLACE_FCHDIR && REPLACE_OPEN_DIRECTORY
  80   /* Handle the case when rpl_open() used a dummy file descriptor to work
  81      around an open() that can't normally visit directories.  */
  82   const char *name = _gl_directory_name (fd);
  83   if (name != NULL)
  84     return stat (name, buf);
  85 #endif
  86
  87   return fstat_nothrow (fd, buf);
  88 }