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89 lines
2.5 KiB
C
89 lines
2.5 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: wbuf.c,v 1.21 2001/09/11 04:04:49 gshapiro Exp $")
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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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/* Note: This function is called from a macro located in <sm/io.h> */
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/*
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** SM_WBUF -- write character to and flush (likely now full) buffer
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**
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** Write the given character into the (probably full) buffer for
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** the given file. Flush the buffer out if it is or becomes full,
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** or if c=='\n' and the file is line buffered.
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**
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** Parameters:
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** fp -- the file pointer
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** timeout -- time to complete operation (milliseconds)
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** c -- int representation of the character to add
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**
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** Results:
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** Failure: -1 and sets errno
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** Success: int value of 'c'
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*/
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int
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sm_wbuf(fp, timeout, c)
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register SM_FILE_T *fp;
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int timeout;
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register int c;
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{
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register int n;
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/*
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** In case we cannot write, or longjmp takes us out early,
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** make sure w is 0 (if fully- or un-buffered) or -bf.smb_size
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** (if line buffered) so that we will get called again.
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** If we did not do this, a sufficient number of sm_io_putc()
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** calls might wrap w from negative to positive.
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*/
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fp->f_w = fp->f_lbfsize;
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if (cantwrite(fp))
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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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c = (unsigned char)c;
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/*
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** If it is completely full, flush it out. Then, in any case,
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** stuff c into the buffer. If this causes the buffer to fill
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** completely, or if c is '\n' and the file is line buffered,
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** flush it (perhaps a second time). The second flush will always
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** happen on unbuffered streams, where bf.smb_size==1; sm_io_flush()
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** guarantees that sm_io_putc() will always call sm_wbuf() by setting
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** w to 0, so we need not do anything else.
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** Note for the timeout, only one of the sm_io_flush's will get called.
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*/
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n = fp->f_p - fp->f_bf.smb_base;
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if (n >= fp->f_bf.smb_size)
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{
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if (sm_io_flush(fp, timeout))
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return SM_IO_EOF; /* sm_io_flush() sets errno */
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n = 0;
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}
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fp->f_w--;
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*fp->f_p++ = c;
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if (++n == fp->f_bf.smb_size || (fp->f_flags & SMLBF && c == '\n'))
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if (sm_io_flush(fp, timeout))
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return SM_IO_EOF; /* sm_io_flush() sets errno */
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return c;
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}
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