newlib-cygwin/newlib/libc/stdio/fflush.c

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/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
FUNCTION
<<fflush>>---flush buffered file output
INDEX
fflush
ANSI_SYNOPSIS
#include <stdio.h>
int fflush(FILE *<[fp]>);
TRAD_SYNOPSIS
#include <stdio.h>
int fflush(<[fp]>)
FILE *<[fp]>;
DESCRIPTION
The <<stdio>> output functions can buffer output before delivering it
to the host system, in order to minimize the overhead of system calls.
Use <<fflush>> to deliver any such pending output (for the file
or stream identified by <[fp]>) to the host system.
If <[fp]> is <<NULL>>, <<fflush>> delivers pending output from all
open files.
RETURNS
<<fflush>> returns <<0>> unless it encounters a write error; in that
situation, it returns <<EOF>>.
PORTABILITY
ANSI C requires <<fflush>>.
No supporting OS subroutines are required.
*/
#include <stdio.h>
#include "local.h"
/* Flush a single file, or (if fp is NULL) all files. */
int
_DEFUN (fflush, (fp),
register FILE * fp)
{
register unsigned char *p;
register int n, t;
if (fp == NULL)
2003-08-22 Jeff Johnston <jjohnstn@redhat.com> * libc/include/sys/reent.h: Add _GLOBAL_REENT macro. * libc/stdio: Globally remove/replace all references to fp->_data. Replace with _REENT or _GLOBAL_REENT where appropriate. * libc/stdio/asprintf.c: Ditto. * libc/stdio/fclose.c: Ditto. * libc/stdio/fvwrite.c: Ditto. * libc/stdio/makebuf.c: Ditto. * libc/stdio/refill.c: Ditto. * libc/stdio/local.h: Ditto. * libc/stdio/setvbuf.c: Ditto. * libc/stdio/sscanf.c: Ditto. * libc/stdio/stdio.c: Ditto. * libc/stdio/ungetc.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vsscanf.c: Ditto. * libc/stdio/fopen.c: Ditto. Also use _fseek_r in _fopen_r. * libc/stdio/vasprintf.c: Ditto. Also call _vfprintf_r directly. * libc/stdio/vsnprintf.c: Ditto. * libc/stdio/vsprintf.c: Ditto. * libc/stdio/fcloseall.c(fcloseall): Use _GLOBAL_REENT macro instead of _REENT to walk file list. * libc/stdio/fflush.c: Ditto. * libc/stdio/fgetpos.c: Add reentrant version and have regular version call reentrant version with _REENT argument. * libc/stdio/fsetpos.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/fseeko.c: Ditto. * libc/stdio/ftell.c: Ditto. * libc/stdio/ftello.c: Ditto. * libc/stdio/freopen.c: Ditto. * libc/stdio/findfp.c: Use _GLOBAL_REENT pointer when adding new files to chain. Also use _GLOBAL_REENT pointer for cleaning up. * libc/stdio/fiprintf.c: Reformatted to minimize duplicate code. * libc/stdio/siprintf.c: Ditto. * libc/stdio/iprintf.c: Ditto. * libc/stdio/fprintf.c: Ditto. * libc/stdio/printf.c: Ditto. * libc/stdio/snprintf.c: Call _vfprintf_r directly. * libc/stdio/sprintf.c: Ditto. * libc/stdio/vprintf.c: Ditto. Also add _REENT_ONLY check. * libc/stdio/rewind.c: Call _fseek_r directly. * libc/stdio/tmpfile.c: Call _fopen_r and _remove_r directly. * libc/stdio/vfprintf.c (_VFPRINTF_R): Change _r routines to use data pointer. (get_arg): Add extra struct _reent pointer argument. * libc/stdio64/fgetpos64.c: Add _r versions, remove any reference to fp->_data. * libc/stdio64/fopen64.c: Ditto. * libc/stdio64/freopen64.c: Ditto. * libc/stdio64/fsetpos64.c: Ditto. * libc/stdio64/ftello64.c: Ditto. * libc/stdio64/local64.h: Ditto. * libc/stdio64/stdio64.c: Ditto. * libc/stdio64/fseeko64.c: Ditto plus use _fstat_r instead of _fstat64_r for the meantime.
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return _fwalk (_GLOBAL_REENT, fflush);
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_flockfile(fp);
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CHECK_INIT (fp);
t = fp->_flags;
if ((t & __SWR) == 0 || (p = fp->_bf._base) == NULL)
{
_funlockfile(fp);
return 0;
}
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n = fp->_p - p; /* write this much */
/*
* Set these immediately to avoid problems with longjmp
* and to allow exchange buffering (via setvbuf) in user
* write function.
*/
fp->_p = p;
fp->_w = t & (__SLBF | __SNBF) ? 0 : fp->_bf._size;
while (n > 0)
{
t = (*fp->_write) (fp->_cookie, (char *) p, n);
if (t <= 0)
{
fp->_flags |= __SERR;
_funlockfile(fp);
return EOF;
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}
p += t;
n -= t;
}
_funlockfile(fp);
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return 0;
}