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Annotation of prex-old/usr/lib/libc/stdio/putc.c, Revision 1.1.1.1

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: }