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