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Annotation of src/usr.bin/window/wwrint.c, Revision 1.1

1.1     ! deraadt     1: /*     $NetBSD: wwrint.c,v 1.3 1995/09/28 10:35:52 tls Exp $   */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1983, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to Berkeley by
        !             8:  * Edward Wang at The University of California, Berkeley.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  */
        !            38:
        !            39: #ifndef lint
        !            40: #if 0
        !            41: static char sccsid[] = "@(#)wwrint.c   8.1 (Berkeley) 6/6/93";
        !            42: #else
        !            43: static char rcsid[] = "$NetBSD: wwrint.c,v 1.3 1995/09/28 10:35:52 tls Exp $";
        !            44: #endif
        !            45: #endif /* not lint */
        !            46:
        !            47: #include "ww.h"
        !            48: #include "tt.h"
        !            49: #if defined(OLD_TTY) || defined(VMIN_BUG)
        !            50: #include <fcntl.h>
        !            51: #endif
        !            52:
        !            53: /*
        !            54:  * Tty input interrupt handler.
        !            55:  * (1) Read input into buffer (wwib*).
        !            56:  * (2) Set the interrupt flag if anything is read.
        !            57:  * Currently, the last is used to get out of the blocking
        !            58:  * select() in wwiomux().
        !            59:  * To avoid race conditions, we only modify wwibq in here, except
        !            60:  * when the buffer is empty; and everywhere else, we only change wwibp.
        !            61:  * It should be completely safe.
        !            62:  */
        !            63: void
        !            64: wwrint()
        !            65: {
        !            66:        register n;
        !            67:
        !            68:        if (wwibp == wwibq)
        !            69:                wwibp = wwibq = wwib;
        !            70:        wwnread++;
        !            71: #if defined(OLD_TTY) || defined(VMIN_BUG)
        !            72:        /* we have set c_cc[VMIN] to 0 */
        !            73:        (void) fcntl(0, F_SETFL, O_NONBLOCK|wwnewtty.ww_fflags);
        !            74: #endif
        !            75:        n = read(0, wwibq, wwibe - wwibq);
        !            76: #if defined(OLD_TTY) || defined(VMIN_BUG)
        !            77:        (void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
        !            78: #endif
        !            79:        if (n > 0) {
        !            80:                if (tt.tt_rint)
        !            81:                        n = (*tt.tt_rint)(wwibq, n);
        !            82:                if (n > 0) {
        !            83:                        wwibq += n;
        !            84:                        wwnreadc += n;
        !            85:                        /*
        !            86:                         * Hasten or delay the next checkpoint,
        !            87:                         * as the case may be.
        !            88:                         */
        !            89:                        if (tt.tt_checkpoint && !wwdocheckpoint)
        !            90:                                (void) alarm(1);
        !            91:                        wwsetintr();
        !            92:                }
        !            93:        } else if (n == 0)
        !            94:                wwnreadz++;
        !            95:        else
        !            96:                wwnreade++;
        !            97: }