lib/fdopen.c

   1 /* Open a stream with a given file descriptor.
   2    Copyright (C) 2011-2018 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 <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <stdio.h>
  21
  22 #include <errno.h>
  23
  24 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  25 # include "msvc-inval.h"
  26 #endif
  27
  28 #undef fdopen
  29
  30 #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  31 static FILE *
  32 fdopen_nothrow (int fd, const char *mode)
  33 {
  34   FILE *result;
  35
  36   TRY_MSVC_INVAL
  37     {
  38       result = fdopen (fd, mode);
  39     }
  40   CATCH_MSVC_INVAL
  41     {
  42       result = NULL;
  43     }
  44   DONE_MSVC_INVAL;
  45
  46   return result;
  47 }
  48 #else
  49 # define fdopen_nothrow fdopen
  50 #endif
  51
  52 FILE *
  53 rpl_fdopen (int fd, const char *mode)
  54 {
  55   int saved_errno = errno;
  56   FILE *fp;
  57
  58   errno = 0;
  59   fp = fdopen_nothrow (fd, mode);
  60   if (fp == NULL)
  61     {
  62       if (errno == 0)
  63         errno = EBADF;
  64     }
  65   else
  66     errno = saved_errno;
  67
  68   return fp;
  69 }