lib/fwritable.h

   1 /* Retrieve information about a FILE stream.
   2    Copyright (C) 2007, 2009-2018 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 <stdbool.h>
  18 #include <stdio.h>
  19
  20 /* Return true if the stream STREAM supports writing, false if it supports
  21    only reading.
  22    STREAM must not be wide-character oriented.
  23    The result doesn't change until the stream is closed or re-opened.  */
  24
  25 #if HAVE___FWRITABLE /* glibc >= 2.2, Solaris >= 7, musl libc */
  26
  27 # include <stdio_ext.h>
  28 # define fwritable(stream) (__fwritable (stream) != 0)
  29
  30 #else
  31
  32 # ifdef __cplusplus
  33 extern "C" {
  34 # endif
  35
  36 extern bool fwritable (FILE *stream) _GL_ATTRIBUTE_PURE;
  37
  38 # ifdef __cplusplus
  39 }
  40 # endif
  41
  42 #endif