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/* Flushing buffers of 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "fpurge.h"
#if HAVE___FPURGE /* glibc >= 2.2, Solaris >= 7 */
# include <stdio_ext.h>
#endif
#include <stdlib.h>
int
fpurge (FILE *fp)
{
#if HAVE___FPURGE /* glibc >= 2.2, Solaris >= 7 */
__fpurge (fp);
/* The __fpurge function does not have a return value. */
return 0;
#elif HAVE_FPURGE /* FreeBSD, NetBSD, OpenBSD, MacOS X */
/* Call the system's fpurge function. */
# undef fpurge
# if !HAVE_DECL_FPURGE
extern int fpurge (FILE *);
# endif
int result = fpurge (fp);
# if defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
if (result == 0)
/* Correct the invariants that fpurge broke.
<stdio.h> on BSD systems says:
"The following always hold: if _flags & __SRD, _w is 0."
If this invariant is not fulfilled and the stream is read-write but
currently writing, subsequent putc or fputc calls will write directly
into the buffer, although they shouldn't be allowed to. */
if ((fp->_flags & __SRD) != 0)
fp->_w = 0;
# endif
return result;
#else
/* 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 */
fp->_IO_read_end = fp->_IO_read_ptr;
fp->_IO_write_ptr = fp->_IO_write_base;
/* Avoid memory leak when there is an active ungetc buffer. */
if (fp->_IO_save_base != NULL)
{
free (fp->_IO_save_base);
fp->_IO_save_base = NULL;
}
return 0;
# elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
fp->_p = fp->_bf._base;
fp->_r = 0;
fp->_w = ((fp->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
? fp->_bf._size
: 0);
/* Avoid memory leak when there is an active ungetc buffer. */
# if defined __NetBSD__ || defined __OpenBSD__ /* NetBSD, OpenBSD */
/* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
# define fp_ub ((struct { struct __sbuf _ub; } *) fp->_ext._base)->_ub
# else /* FreeBSD, MacOS X, Cygwin */
# define fp_ub fp->_ub
# endif
if (fp_ub._base != NULL)
{
if (fp_ub._base != fp->_ubuf)
free (fp_ub._base);
fp_ub._base = NULL;
}
return 0;
# elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
fp->_ptr = fp->_base;
if (fp->_ptr != NULL)
fp->_cnt = 0;
return 0;
# elif defined __UCLIBC__ /* uClibc */
# ifdef __STDIO_BUFFERS
if (fp->__modeflags & __FLAG_WRITING)
fp->__bufpos = fp->__bufstart;
else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))
fp->__bufpos = fp->__bufread;
# endif
return 0;
# elif defined __QNX__ /* QNX */
fp->_Rback = fp->_Back + sizeof (fp->_Back);
fp->_Rsave = NULL;
if (fp->_Mode & _MWRITE)
/* fp->_Buf <= fp->_Next <= fp->_Wend */
fp->_Next = fp->_Buf;
else
/* fp->_Buf <= fp->_Next <= fp->_Rend */
fp->_Rend = fp->_Next;
# else
#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."
# endif
#endif
}
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