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/* Retrieve information about a FILE stream.
Copyright (C) 2007-2022 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "fbufmode.h"
#if HAVE___FLBF
# if HAVE_STDIO_EXT_H
# include <stdio_ext.h>
# endif
#endif
#include "stdio-impl.h"
int
fbufmode (FILE *fp)
{
/* Most systems provide FILE as a struct and the necessary bitmask in
<stdio.h>, because they need it for implementing getc() and putc() as
fast macros. */
#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
/* GNU libc, BeOS, Haiku, Linux libc5 */
# if HAVE___FLBF /* glibc >= 2.2 */
if (__flbf (fp))
return _IOLBF;
# else
if (fp->_flags & _IO_LINE_BUF)
return _IOLBF;
# endif
if (fp->_flags & _IO_UNBUFFERED)
return _IONBF;
return _IOFBF;
#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
/* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
if (fp_->_flags & __SLBF)
return _IOLBF;
if (fp_->_flags & __SNBF)
return _IONBF;
return _IOFBF;
#elif defined __EMX__ /* emx+gcc */
return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
#elif defined __minix /* Minix */
return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */
# if defined WINDOWS_OPAQUE_FILE
if (fp_->_flag & 0x100)
return _IOFBF; /* Impossible to distinguish _IOFBF and _IOLBF. */
else
return _IONBF;
# else
# if HAVE___FLBF /* Solaris >= 7 */
if (__flbf (fp))
return _IOLBF;
# else
if (fp_->_flag & _IOLBF)
return _IOLBF;
# endif
if (fp_->_flag & _IONBF)
return _IONBF;
return _IOFBF;
# endif
#elif defined __UCLIBC__ /* uClibc */
if (fp->__modeflags & __FLAG_LBF)
return _IOLBF;
if (fp->__modeflags & __FLAG_NBF)
return _IONBF;
return _IOFBF;
#elif defined __QNX__ /* QNX */
if (fp->_Mode & 0x400 /* _MLBF */)
return _IOLBF;
if (fp->_Mode & 0x800 /* _MNBF */)
return _IONBF;
return _IOFBF;
#elif defined __MINT__ /* Atari FreeMiNT */
if (fp->__linebuf)
return _IOLBF;
return (fp->__bufsize > 0 ? _IOFBF : _IONBF);
#elif HAVE___FLBF && HAVE___FBUFSIZE /* musl libc */
if (__flbf (fp))
return _IOLBF;
return (__fbufsize (fp) > 0 ? _IOFBF : _IONBF);
#elif defined EPLAN9 /* Plan9 */
if (fp->flags & 2 /* LINEBUF */)
return _IOLBF;
if (fp->bufl)
return _IOFBF;
return _IONBF;
#else
# error "Please port gnulib fbufmode.c to your platform! Look at the setvbuf implementation."
#endif
}
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