fpurge.c revision 266692 
1/*
2 * Copyright (c) 2000-2001 Proofpoint, Inc. and its suppliers.
3 *      All rights reserved.
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * By using this file, you agree to the terms and conditions set
11 * forth in the LICENSE file which can be found at the top level of
12 * the sendmail distribution.
13 */
14
15#include <sm/gen.h>
16SM_RCSID("@(#)$Id: fpurge.c,v 1.21 2013-11-22 20:51:42 ca Exp $")
17#include <stdlib.h>
18#include <errno.h>
19#include <sm/io.h>
20#include <sm/assert.h>
21#include "local.h"
22
23/*
24**  SM_IO_PURGE -- purge/empty the buffer without committing buffer content
25**
26**	Parameters:
27**		fp -- file pointer to purge
28**
29**	Returns:
30**		Failure: returns SM_IO_EOF and sets errno
31**		Success: returns 0 (zero)
32*/
33
34int
35sm_io_purge(fp)
36	register SM_FILE_T *fp;
37{
38	SM_REQUIRE_ISA(fp, SmFileMagic);
39	if (!fp->f_flags)
40	{
41		errno = EBADF;
42		return SM_IO_EOF;
43	}
44
45	if (HASUB(fp))
46		FREEUB(fp);
47	fp->f_p = fp->f_bf.smb_base;
48	fp->f_r = 0;
49
50	/* implies SMFBF */
51	fp->f_w = fp->f_flags & (SMLBF|SMNBF) ? 0 : fp->f_bf.smb_size;
52	return 0;
53}
54