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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: wbuf.c,v 1.21 2001/09/11 04:04:49 gshapiro Exp $")
#include <errno.h>
#include <sm/io.h>
#include "local.h"

/* Note: This function is called from a macro located in <sm/io.h> */

**  SM_WBUF -- write character to and flush (likely now full) buffer
**  Write the given character into the (probably full) buffer for
**  the given file.  Flush the buffer out if it is or becomes full,
**  or if c=='\n' and the file is line buffered.
**    Parameters:
**          fp -- the file pointer
**          timeout -- time to complete operation (milliseconds)
**          c -- int representation of the character to add
**    Results:
**          Failure: -1 and sets errno
**          Success: int value of 'c'

sm_wbuf(fp, timeout, c)
      register SM_FILE_T *fp;
      int timeout;
      register int c;
      register int n;

      **  In case we cannot write, or longjmp takes us out early,
      **  make sure w is 0 (if fully- or un-buffered) or -bf.smb_size
      **  (if line buffered) so that we will get called again.
      **  If we did not do this, a sufficient number of sm_io_putc()
      **  calls might wrap w from negative to positive.

      fp->f_w = fp->f_lbfsize;
      if (cantwrite(fp))
            errno = EBADF;
            return SM_IO_EOF;
      c = (unsigned char)c;

      **  If it is completely full, flush it out.  Then, in any case,
      **  stuff c into the buffer.  If this causes the buffer to fill
      **  completely, or if c is '\n' and the file is line buffered,
      **  flush it (perhaps a second time).  The second flush will always
      **  happen on unbuffered streams, where bf.smb_size==1; sm_io_flush()
      **  guarantees that sm_io_putc() will always call sm_wbuf() by setting
      **  w to 0, so we need not do anything else.
      **  Note for the timeout, only one of the sm_io_flush's will get called.

      n = fp->f_p - fp->f_bf.smb_base;
      if (n >= fp->f_bf.smb_size)
            if (sm_io_flush(fp, timeout))
                  return SM_IO_EOF; /* sm_io_flush() sets errno */
            n = 0;
      *fp->f_p++ = c;
      if (++n == fp->f_bf.smb_size || (fp->f_flags & SMLBF && c == '\n'))
            if (sm_io_flush(fp, timeout))
                  return SM_IO_EOF; /* sm_io_flush() sets errno */
      return c;

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