mirror of
https://https.git.savannah.gnu.org/git/gnulib.git
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Bruno Haible
49 lines
1.8 KiB
C
49 lines
1.8 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 "freading.h"
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/* Don't use glibc's __freading function, see
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<http://sourceware.org/bugzilla/show_bug.cgi?id=4359> */
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#if !(HAVE___FREADING && !defined __GLIBC__)
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bool
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freading (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_WRITES) != 0
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|| ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
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&& fp->_IO_read_base != NULL));
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#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
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return (fp->_flags & __SRD) != 0;
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#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
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return (fp->_flag & _IOREAD) != 0;
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#elif defined __UCLIBC__ /* uClibc */
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return (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING)) != 0;
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#else
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#error "Please port gnulib freading.c to your platform!"
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#endif
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}
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#endif
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