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Annotation of sys/lib/libsa/cons.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: cons.c,v 1.11 2003/08/11 06:23:09 deraadt Exp $       */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1988 University of Utah.
        !             5:  * Copyright (c) 1990, 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:  * the Systems Programming Group of the University of Utah Computer
        !            10:  * Science Department.
        !            11:  *
        !            12:  * Redistribution and use in source and binary forms, with or without
        !            13:  * modification, are permitted provided that the following conditions
        !            14:  * are met:
        !            15:  * 1. Redistributions of source code must retain the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer.
        !            17:  * 2. Redistributions in binary form must reproduce the above copyright
        !            18:  *    notice, this list of conditions and the following disclaimer in the
        !            19:  *    documentation and/or other materials provided with the distribution.
        !            20:  * 3. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  * form: OpenBSD: cons.c,v 1.7 1996/04/21 22:19:48
        !            37:  * from: OpenBSD: cninit.c,v 1.2 1996/03/30 02:03:45
        !            38:  * from: Utah $Hdr: cons.c 1.7 92/01/21$
        !            39:  *
        !            40:  *     @(#)cons.c      8.2 (Berkeley) 1/12/94
        !            41:  */
        !            42:
        !            43: #include <sys/param.h>
        !            44: #include "stand.h"
        !            45: #include <dev/cons.h>
        !            46:
        !            47: void
        !            48: cninit(void)
        !            49: {
        !            50:        struct consdev *cp;
        !            51:
        !            52:        /*
        !            53:         * Collect information about all possible consoles
        !            54:         * and find the one with highest priority
        !            55:         */
        !            56:        for (cp = constab; cp->cn_probe; cp++) {
        !            57:                (*cp->cn_probe)(cp);
        !            58:                if (cp->cn_pri > CN_DEAD &&
        !            59:                    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
        !            60:                        cn_tab = cp;
        !            61:        }
        !            62:        /*
        !            63:         * No console, we can handle it
        !            64:         */
        !            65:        if ((cp = cn_tab) == NULL)
        !            66:                return;
        !            67:        /*
        !            68:         * Turn on console
        !            69:         */
        !            70:        (*cp->cn_init)(cp);
        !            71: }
        !            72:
        !            73: int
        !            74: cnset(dev_t dev)
        !            75: {
        !            76:        struct consdev *cp;
        !            77:
        !            78:        /*
        !            79:         * Look for the specified console device and use it.
        !            80:         */
        !            81:        for (cp = constab; cp->cn_probe; cp++) {
        !            82:                if (major(cp->cn_dev) == major(dev)) {
        !            83:                        /* short-circuit noop */
        !            84:                        if (cp == cn_tab && cp->cn_dev == dev)
        !            85:                                return (0);
        !            86:                        if (cp->cn_pri > CN_DEAD) {
        !            87:                                cn_tab = cp;
        !            88:                                cp->cn_dev = dev;
        !            89:                                /* Turn it on.  */
        !            90:                                (cp->cn_init)(cp);
        !            91:                                return (0);
        !            92:                        }
        !            93:                        break;
        !            94:                }
        !            95:        }
        !            96:        return (1);
        !            97: }
        !            98:
        !            99: int
        !           100: cngetc(void)
        !           101: {
        !           102:        if (cn_tab == NULL)
        !           103:                return (0);
        !           104:        return ((*cn_tab->cn_getc)(cn_tab->cn_dev));
        !           105: }
        !           106:
        !           107: void
        !           108: cnputc(int c)
        !           109: {
        !           110:        if (cn_tab != NULL && c) {
        !           111:                (*cn_tab->cn_putc)(cn_tab->cn_dev, c);
        !           112:                if (c == '\n')
        !           113:                        (*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
        !           114:        }
        !           115: }
        !           116:
        !           117: int
        !           118: cnischar(void)
        !           119: {
        !           120:        if (cn_tab != NULL)
        !           121:                return ((*cn_tab->cn_getc)(cn_tab->cn_dev|0x80));
        !           122:        return 0;
        !           123: }