1/*
2 * Copyright (c) 2000-2001 Sendmail, 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#pragma ident	"%Z%%M%	%I%	%E% SMI"
16
17#include <sm/gen.h>
18SM_RCSID("@(#)$Id: fwrite.c,v 1.22 2001/04/03 01:46:40 ca Exp $")
19#include <errno.h>
20#include <sm/io.h>
21#include <sm/assert.h>
22#include "local.h"
23#include "fvwrite.h"
24
25/*
26**  SM_IO_WRITE -- write to a file pointer
27**
28**	Parameters:
29**		fp -- file pointer writing to
30**		timeout -- time to complete the write
31**		buf -- location of data to be written
32**		size -- number of bytes to be written
33**
34**	Result:
35**		Failure: returns 0 _and_ sets errno
36**		Success: returns >=0 with errno unchanged, where the
37**			number returned is the number of bytes written.
38*/
39
40size_t
41sm_io_write(fp, timeout, buf, size)
42	SM_FILE_T *fp;
43	int timeout;
44	const void *buf;
45	size_t size;
46{
47	struct sm_uio uio;
48	struct sm_iov iov;
49
50	SM_REQUIRE_ISA(fp, SmFileMagic);
51
52	if (fp->f_write == NULL)
53	{
54		errno = ENODEV;
55		return 0;
56	}
57
58	iov.iov_base = (void *) buf;
59	uio.uio_resid = iov.iov_len = size;
60	uio.uio_iov = &iov;
61	uio.uio_iovcnt = 1;
62
63	/* The usual case is success (sm_fvwrite returns 0) */
64	if (sm_fvwrite(fp, timeout, &uio) == 0)
65		return size;
66
67	/* else return number of bytes actually written */
68	return size - uio.uio_resid;
69}
70