This generalizes the fpurge() function from the BSDs (FreeBSD, MacOS X,
OpenBSD, NetBSD).
2007-04-13 Bruno Haible <[EMAIL PROTECTED]>
* modules/fpurge: New file.
* lib/fpurge.h: New file.
* lib/fpurge.c: New file.
* m4/fpurge.m4: New file.
============================ modules/fpurge ==============================
Description:
fpurge() function: Flush buffers.
Files:
lib/fpurge.h
lib/fpurge.c
m4/fpurge.m4
Depends-on:
configure.ac:
gl_FUNC_FPURGE
Makefile.am:
Include:
"fpurge.h"
License:
LGPL
Maintainer:
Bruno Haible, Eric Blake
============================= lib/fpurge.h ===============================
/* 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 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 <stdio.h>
/* Discard all pending buffered I/O on the stream STREAM.
STREAM must not be wide-character oriented.
Return 0 if successful. Upon error, return -1 and set errno. */
#if HAVE___FPURGE /* glibc >= 2.2, Solaris >= 7 */
# include <stdio_ext.h>
# define fpurge(stream) (__fpurge (stream), 0)
#elif ! HAVE_DECL_FPURGE
# ifdef __cplusplus
extern "C" {
# endif
extern int fpurge (FILE *stream);
# ifdef __cplusplus
}
# endif
#endif
============================= lib/fpurge.c ===============================
/* 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 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 "fpurge.h"
int
fpurge (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 */
fp->_IO_read_end = fp->_IO_read_ptr;
fp->_IO_write_ptr = fp->_IO_write_base;
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) == 0) /* fully buffered? */
? fp->_bf._size
: 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;
#else
#error "Please port gnulib fpurge.c to your platform!"
#endif
}
============================= m4/fpurge.m4 ===============================
# fpurge.m4 serial 1
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_FPURGE],
[
AC_CHECK_FUNCS_ONCE([fpurge])
AC_CHECK_FUNCS_ONCE([__fpurge])
AC_CHECK_DECLS([fpurge], , , [#include <stdio.h>])
if test $ac_cv_func_fpurge = no && test $ac_cv_func___fpurge = no; then
AC_LIBOBJ([fpurge])
AC_CHECK_FUNCS([fpurge])
fi
])
