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scoutos / prex-0.9.0 / usr / lib / libc / stdio / putc.c @ 03e9c04a

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/*-
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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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 * 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. 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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 */
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#include <stdio.h>
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#include "local.h"
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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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int
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__swbuf(c, fp)
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        int c;
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        FILE *fp;
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{
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        int n;
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        if (cantwrite(fp))
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                return (EOF);
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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._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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                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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int
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putc(c, fp)
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        int c;
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        FILE *fp;
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{
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        if (--fp->_w >= 0)
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                return (*fp->_p++ = c);
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        else
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                return (__swbuf(c, fp));
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}