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Annotation of prex-old/usr/lib/libc/stdio/putc.c, Revision 1.1

1.1     ! nbrk        1: /*-
        !             2:  * Copyright (c) 1990, 1993
        !             3:  *     The Regents of the University of California.  All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Chris Torek.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  */
        !            32:
        !            33: #include <stdio.h>
        !            34: #include "local.h"
        !            35:
        !            36: /*
        !            37:  * Write the given character into the (probably full) buffer for
        !            38:  * the given file.  Flush the buffer out if it is or becomes full,
        !            39:  * or if c=='\n' and the file is line buffered.
        !            40:  */
        !            41: int
        !            42: __swbuf(c, fp)
        !            43:        int c;
        !            44:        FILE *fp;
        !            45: {
        !            46:        int n;
        !            47:
        !            48:        if (cantwrite(fp))
        !            49:                return (EOF);
        !            50:        c = (unsigned char)c;
        !            51:
        !            52:        /*
        !            53:         * If it is completely full, flush it out.  Then, in any case,
        !            54:         * stuff c into the buffer.  If this causes the buffer to fill
        !            55:         * completely, or if c is '\n' and the file is line buffered,
        !            56:         * flush it (perhaps a second time).  The second flush will always
        !            57:         * happen on unbuffered streams, where _bf._size==1; fflush()
        !            58:         * guarantees that putc() will always call wbuf() by setting _w
        !            59:         * to 0, so we need not do anything else.
        !            60:         */
        !            61:        n = fp->_p - fp->_bf._base;
        !            62:        if (n >= fp->_bf._size) {
        !            63:                if (fflush(fp))
        !            64:                        return (EOF);
        !            65:                n = 0;
        !            66:        }
        !            67:        fp->_w--;
        !            68:        *fp->_p++ = c;
        !            69:        if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n'))
        !            70:                if (fflush(fp))
        !            71:                        return (EOF);
        !            72:        return (c);
        !            73: }
        !            74:
        !            75: int
        !            76: putc(c, fp)
        !            77:        int c;
        !            78:        FILE *fp;
        !            79: {
        !            80:        if (--fp->_w >= 0)
        !            81:                return (*fp->_p++ = c);
        !            82:        else
        !            83:                return (__swbuf(c, fp));
        !            84: }