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Annotation of src/usr.bin/window/wwrint.c, Revision 1.4

1.4     ! downsj      1: /*     $OpenBSD$       */
1.2       deraadt     2: /*     $NetBSD: wwrint.c,v 1.4 1995/12/21 10:46:24 mycroft Exp $       */
1.1       deraadt     3:
                      4: /*
                      5:  * Copyright (c) 1983, 1993
                      6:  *     The Regents of the University of California.  All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * Edward Wang at The University of California, Berkeley.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. All advertising materials mentioning features or use of this software
                     20:  *    must display the following acknowledgement:
                     21:  *     This product includes software developed by the University of
                     22:  *     California, Berkeley and its contributors.
                     23:  * 4. Neither the name of the University nor the names of its contributors
                     24:  *    may be used to endorse or promote products derived from this software
                     25:  *    without specific prior written permission.
                     26:  *
                     27:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     28:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     29:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     30:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     31:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     32:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     33:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     34:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     35:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     36:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     37:  * SUCH DAMAGE.
                     38:  */
                     39:
                     40: #ifndef lint
                     41: #if 0
                     42: static char sccsid[] = "@(#)wwrint.c   8.1 (Berkeley) 6/6/93";
                     43: #else
1.4     ! downsj     44: static char rcsid[] = "$OpenBSD$";
1.1       deraadt    45: #endif
                     46: #endif /* not lint */
                     47:
                     48: #include "ww.h"
                     49: #include "tt.h"
                     50:
                     51: /*
                     52:  * Tty input interrupt handler.
                     53:  * (1) Read input into buffer (wwib*).
                     54:  * (2) Set the interrupt flag if anything is read.
                     55:  * Currently, the last is used to get out of the blocking
                     56:  * select() in wwiomux().
                     57:  * To avoid race conditions, we only modify wwibq in here, except
                     58:  * when the buffer is empty; and everywhere else, we only change wwibp.
                     59:  * It should be completely safe.
                     60:  */
                     61: void
                     62: wwrint()
                     63: {
                     64:        register n;
                     65:
                     66:        wwnread++;
                     67:        n = read(0, wwibq, wwibe - wwibq);
                     68:        if (n > 0) {
                     69:                if (tt.tt_rint)
                     70:                        n = (*tt.tt_rint)(wwibq, n);
                     71:                if (n > 0) {
                     72:                        wwibq += n;
                     73:                        wwnreadc += n;
                     74:                        /*
                     75:                         * Hasten or delay the next checkpoint,
                     76:                         * as the case may be.
                     77:                         */
                     78:                        if (tt.tt_checkpoint && !wwdocheckpoint)
                     79:                                (void) alarm(1);
                     80:                        wwsetintr();
                     81:                }
                     82:        } else if (n == 0)
                     83:                wwnreadz++;
                     84:        else
                     85:                wwnreade++;
                     86: }