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/*
* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*/
#include <sm/gen.h>
SM_RCSID("@(#)$Id: fwrite.c,v 1.24 2001/09/11 04:04:48 gshapiro Exp $")
#include <errno.h>
#include <sm/io.h>
#include <sm/assert.h>
#include "local.h"
#include "fvwrite.h"
/*
** SM_IO_WRITE -- write to a file pointer
**
** Parameters:
** fp -- file pointer writing to
** timeout -- time to complete the write
** buf -- location of data to be written
** size -- number of bytes to be written
**
** Result:
** Failure: returns 0 _and_ sets errno
** Success: returns >=0 with errno unchanged, where the
** number returned is the number of bytes written.
*/
size_t
sm_io_write(fp, timeout, buf, size)
SM_FILE_T *fp;
int timeout;
const void *buf;
size_t size;
{
struct sm_uio uio;
struct sm_iov iov;
SM_REQUIRE_ISA(fp, SmFileMagic);
if (fp->f_write == NULL)
{
errno = ENODEV;
return 0;
}
iov.iov_base = (void *) buf;
uio.uio_resid = iov.iov_len = size;
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
/* The usual case is success (sm_fvwrite returns 0) */
if (sm_fvwrite(fp, timeout, &uio) == 0)
return size;
/* else return number of bytes actually written */
return size - uio.uio_resid;
}
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