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110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/* Retrieve information about a FILE stream.
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Copyright (C) 2007-2026 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "fbufmode.h"
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#if HAVE___FLBF
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# if HAVE_STDIO_EXT_H
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# include <stdio_ext.h>
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# endif
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#endif
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#include "stdio-impl.h"
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int
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fbufmode (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_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1) && !(defined __HAIKU__ && HAVE___FLBF && HAVE___FBUFSIZE)
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/* GNU libc, BeOS, Haiku < hrev58760, Linux libc5 */
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# if !defined __HAIKU__
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# define fp_ fp
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# endif
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# if HAVE___FLBF /* glibc >= 2.2 */
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if (__flbf (fp))
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return _IOLBF;
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# else
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if (fp_->_flags & _IO_LINE_BUF)
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return _IOLBF;
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# endif
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if (fp_->_flags & _IO_UNBUFFERED)
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return _IONBF;
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return _IOFBF;
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#elif defined __sferror || defined __OpenBSD__ || defined __DragonFly__ || defined __ANDROID__
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/* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
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if (fp_->_flags & __SLBF)
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return _IOLBF;
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if (fp_->_flags & __SNBF)
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return _IONBF;
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return _IOFBF;
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#elif defined __EMX__ /* emx+gcc */
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return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
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#elif defined __minix /* Minix */
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return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
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#elif defined _IOERR /* AIX, HP-UX, Solaris, OpenServer, UnixWare, mingw, MSVC, NonStop Kernel, OpenVMS */
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# if defined WINDOWS_OPAQUE_FILE
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if (fp_->_flag & 0x100)
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return _IOFBF; /* Impossible to distinguish _IOFBF and _IOLBF. */
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else
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return _IONBF;
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# else
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# if HAVE___FLBF /* Solaris >= 7 */
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if (__flbf (fp))
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return _IOLBF;
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# else
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if (fp_->_flag & _IOLBF)
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return _IOLBF;
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# endif
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if (fp_->_flag & _IONBF)
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return _IONBF;
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return _IOFBF;
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# endif
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#elif defined __UCLIBC__ /* uClibc */
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if (fp->__modeflags & __FLAG_LBF)
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return _IOLBF;
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if (fp->__modeflags & __FLAG_NBF)
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return _IONBF;
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return _IOFBF;
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#elif defined __QNX__ /* QNX */
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if (fp->_Mode & 0x400 /* _MLBF */)
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return _IOLBF;
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if (fp->_Mode & 0x800 /* _MNBF */)
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return _IONBF;
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return _IOFBF;
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#elif defined __MINT__ /* Atari FreeMiNT */
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if (fp->__linebuf)
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return _IOLBF;
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return (fp->__bufsize > 0 ? _IOFBF : _IONBF);
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#elif HAVE___FLBF && HAVE___FBUFSIZE /* musl libc, Haiku >= hrev58760 */
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if (__flbf (fp))
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return _IOLBF;
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return (__fbufsize (fp) > 0 ? _IOFBF : _IONBF);
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#elif defined EPLAN9 /* Plan9 */
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if (fp->flags & 2 /* LINEBUF */)
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return _IOLBF;
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if (fp->bufl)
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return _IOFBF;
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return _IONBF;
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#else
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# error "Please port gnulib fbufmode.c to your platform! Look at the setvbuf implementation."
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#endif
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}
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