126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/* wbuf.c - file for stdio.h */
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/* Copyright 1992 Wind River Systems, Inc. */
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/*
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modification history
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--------------------
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01b,20sep92,smb documentation additions
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01a,29jul92,smb taken from UCB stdio
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*/
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/*
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DESCRIPTION
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* Copyright (c) 1990 The Regents of the University of California.
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* 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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INCLUDE FILE: stdio.h
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SEE ALSO: American National Standard X3.159-1989
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NOMANUAL
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*/
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#include "vxWorks.h"
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#include "stdio.h"
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#include "private/stdioP.h"
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/******************************************************************************
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*
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* __swbuf -
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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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* INCLUDE: stdio.h
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*
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* RETURNS:
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* NOMANAUL
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*/
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int __swbuf
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(
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FAST int c,
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FAST FILE * fp
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)
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{
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FAST 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._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 putc()
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* calls might wrap _w from negative to positive.
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*/
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fp->_w = fp->_lbfsize;
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if (cantwrite (fp))
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return (EOF);
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c = (uchar_t)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._size==1; fflush()
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* guarantees that putc() will always call wbuf() by setting _w
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* to 0, so we need not do anything else.
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*/
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n = fp->_p - fp->_bf._base;
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if (n >= fp->_bf._size)
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{
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if (fflush (fp))
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return (EOF);
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n = 0;
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}
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fp->_w--;
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*fp->_p++ = c;
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if ((++n == fp->_bf._size) || (fp->_flags & __SLBF && c == '\n'))
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if (fflush (fp))
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return (EOF);
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return (c);
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}
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