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authorBruno Haible <bruno@clisp.org>2007-04-14 00:20:08 +0000
committerBruno Haible <bruno@clisp.org>2007-04-14 00:20:08 +0000
commitea27c6baf761ef00f1f357b1dbf11782bb7deae2 (patch)
tree14572c52e37276476d4ff827ee961b7dc1ff9de4 /lib/fbufmode.c
parent384cc9551d11f74b9c642e6ca0dfc586cfafba5f (diff)
downloadgnulib-ea27c6baf761ef00f1f357b1dbf11782bb7deae2.tar.gz
New module 'fbufmode'.
Diffstat (limited to 'lib/fbufmode.c')
-rw-r--r--lib/fbufmode.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/fbufmode.c b/lib/fbufmode.c
new file mode 100644
index 0000000000..3090d8f9cf
--- /dev/null
+++ b/lib/fbufmode.c
@@ -0,0 +1,64 @@
+/* Retrieve information about a FILE stream.
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include <config.h>
+
+/* Specification. */
+#include "fbufmode.h"
+
+#if HAVE___FLBF
+# include <stdio_ext.h>
+#endif
+
+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_ferror_unlocked /* GNU libc, BeOS */
+# 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 /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
+ if (fp->_flags & __SLBF)
+ return _IOLBF;
+ if (fp->_flags & __SNBF)
+ return _IONBF;
+ return _IOFBF;
+#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
+# 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;
+#else
+ #error "Please port gnulib fbufmode.c to your platform! Look at the setvbuf implementation."
+#endif
+}