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Bruno Haible
39 lines
1.5 KiB
C
39 lines
1.5 KiB
C
/* Retrieve information about a FILE stream.
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Copyright (C) 2007 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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#include <config.h>
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/* Specification. */
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#include "freadable.h"
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bool
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freadable (FILE *fp)
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{
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/* Most systems provide FILE as a struct and the necessary bitmask in
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<stdio.h>, because they need it for implementing getc() and putc() as
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fast macros. */
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#if defined _IO_ferror_unlocked /* GNU libc, BeOS */
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return (fp->_flags & _IO_NO_READS) == 0;
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#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
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return (fp->_flags & (__SRW | __SRD)) != 0;
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#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
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return (fp->_flag & (_IORW | _IOREAD)) != 0;
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#else
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#error "Please port gnulib freadable.c to your platform!"
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#endif
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}
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