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85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* Copyright (c) 2000-2002 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: wsetup.c,v 1.20 2002/02/07 18:02:45 ca Exp $")
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#include <stdlib.h>
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#include <errno.h>
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#include <sm/io.h>
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#include "local.h"
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/*
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** SM_WSETUP -- check writing is safe
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**
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** Various output routines call wsetup to be sure it is safe to write,
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** because either flags does not include SMMWR, or buf is NULL.
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** Used in the macro "cantwrite" found in "local.h".
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**
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** Parameters:
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** fp -- the file pointer
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**
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** Results:
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** Failure: SM_IO_EOF and sets errno
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** Success: 0 (zero)
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*/
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int
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sm_wsetup(fp)
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register SM_FILE_T *fp;
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{
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/* make sure stdio is set up */
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if (!Sm_IO_DidInit)
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sm_init();
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/* If we are not writing, we had better be reading and writing. */
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if ((fp->f_flags & SMWR) == 0)
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{
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if ((fp->f_flags & SMRW) == 0)
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{
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errno = EBADF;
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return SM_IO_EOF;
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}
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if (fp->f_flags & SMRD)
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{
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/* clobber any ungetc data */
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if (HASUB(fp))
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FREEUB(fp);
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/* discard read buffer */
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fp->f_flags &= ~(SMRD|SMFEOF);
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fp->f_r = 0;
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fp->f_p = fp->f_bf.smb_base;
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}
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fp->f_flags |= SMWR;
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}
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/* Make a buffer if necessary, then set w. */
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if (fp->f_bf.smb_base == NULL)
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sm_makebuf(fp);
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if (fp->f_flags & SMLBF)
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{
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/*
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** It is line buffered, so make lbfsize be -bufsize
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** for the sm_putc() macro. We will change lbfsize back
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** to 0 whenever we turn off SMWR.
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*/
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fp->f_w = 0;
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fp->f_lbfsize = -fp->f_bf.smb_size;
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}
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else
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fp->f_w = fp->f_flags & SMNBF ? 0 : fp->f_bf.smb_size;
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return 0;
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}
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