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Annotation of sys/lib/libsa/cons.c, Revision 1.1.1.1

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: }