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: }
CVSweb