1 /* Flushing buffers of a FILE stream.
2 Copyright (C) 2007 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
28 /* Most systems provide FILE as a struct and the necessary bitmask in
29 <stdio.h>, because they need it for implementing getc() and putc() as
31 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
32 fp->_IO_read_end = fp->_IO_read_ptr;
33 fp->_IO_write_ptr = fp->_IO_write_base;
34 /* Avoid memory leak when there is an active ungetc buffer. */
35 if (fp->_IO_save_base != NULL)
37 free (fp->_IO_save_base);
38 fp->_IO_save_base = NULL;
41 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
42 fp->_p = fp->_bf._base;
44 fp->_w = ((fp->_flags & (__SLBF | __SNBF)) == 0 /* fully buffered? */
47 /* Avoid memory leak when there is an active ungetc buffer. */
48 # if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
49 /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
50 and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
51 # define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub
52 # else /* FreeBSD, MacOS X, Cygwin */
53 # define fp_ub fp->_ub
55 if (fp_ub._base != NULL)
57 if (fp_ub._base != fp->_ubuf)
62 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
68 #error "Please port gnulib fpurge.c to your platform! Look at the definitions of fflush, setvbuf and ungetc on your system, then report this to bug-gnulib."