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room.c revision 1.1 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)room.c	5.3 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 #include "externs.h"
     39 
     40 writedes()
     41 {
     42 	int compass;
     43 	register char *p;
     44 	register c;
     45 
     46 	printf("\n\t%s\n", location[position].name);
     47 	if (beenthere[position] < 3) {
     48 		compass = NORTH;
     49 		for (p = location[position].desc; c = *p++;)
     50 			if (c != '-' && c != '*' && c != '+')
     51 				putchar(c);
     52 			else {
     53 				if (c != '*')
     54 					printf(truedirec(compass, c));
     55 				compass++;
     56 			}
     57 	}
     58 }
     59 
     60 printobjs()
     61 {
     62 	register unsigned int *p = location[position].objects;
     63 	register n;
     64 
     65 	printf("\n");
     66 	for (n = 0; n < NUMOFOBJECTS; n++)
     67 		if (testbit(p, n) && objdes[n])
     68 			puts(objdes[n]);
     69 }
     70 
     71 whichway(here)
     72 struct room here;
     73 {
     74 	switch(direction) {
     75 
     76 		case NORTH:
     77 			left = here.west;
     78 			right = here.east;
     79 			ahead = here.north;
     80 			back = here.south;
     81 			break;
     82 
     83 		case SOUTH:
     84 			left = here.east;
     85 			right = here.west;
     86 			ahead = here.south;
     87 			back = here.north;
     88 			break;
     89 
     90 		case EAST:
     91 			left = here.north;
     92 			right = here.south;
     93 			ahead = here.east;
     94 			back = here.west;
     95 			break;
     96 
     97 		case WEST:
     98 			left = here.south;
     99 			right = here.north;
    100 			ahead = here.west;
    101 			back = here.east;
    102 			break;
    103 
    104 	}
    105 }
    106 
    107 char *
    108 truedirec(way, option)
    109 int way;
    110 char option;
    111 {
    112 	switch(way) {
    113 
    114 		case NORTH:
    115 			switch(direction) {
    116 				case NORTH:
    117 					return("ahead");
    118 				case SOUTH:
    119 					return(option == '+' ? "behind you" : "back");
    120 				case EAST:
    121 					return("left");
    122 				case WEST:
    123 					return("right");
    124 			}
    125 
    126 		case SOUTH:
    127 			switch(direction) {
    128 				case NORTH:
    129 					return(option == '+' ? "behind you" : "back");
    130 				case SOUTH:
    131 					return("ahead");
    132 				case EAST:
    133 					return("right");
    134 				case WEST:
    135 					return("left");
    136 			}
    137 
    138 		case EAST:
    139 			switch(direction) {
    140 				case NORTH:
    141 					return("right");
    142 				case SOUTH:
    143 					return("left");
    144 				case EAST:
    145 					return("ahead");
    146 				case WEST:
    147 					return(option == '+' ? "behind you" : "back");
    148 			}
    149 
    150 		case WEST:
    151 			switch(direction) {
    152 				case NORTH:
    153 					return("left");
    154 				case SOUTH:
    155 					return("right");
    156 				case EAST:
    157 					return(option == '+' ? "behind you" : "back");
    158 				case WEST:
    159 					return("ahead");
    160 			}
    161 
    162 		default:
    163 			printf("Error: room %d.  More than four directions wanted.", position);
    164 			return("!!");
    165       }
    166 }
    167 
    168 newway(thisway)
    169 int thisway;
    170 {
    171 	switch(direction){
    172 
    173 		case NORTH:
    174 			switch(thisway){
    175 				case LEFT:
    176 					direction = WEST;
    177 					break;
    178 				case RIGHT:
    179 					direction = EAST;
    180 					break;
    181 				case BACK:
    182 					direction = SOUTH;
    183 					break;
    184 			}
    185 			break;
    186 		case SOUTH:
    187 			switch(thisway){
    188 				case LEFT:
    189 					direction = EAST;
    190 					break;
    191 				case RIGHT:
    192 					direction = WEST;
    193 					break;
    194 				case BACK:
    195 					direction = NORTH;
    196 					break;
    197 			}
    198 			break;
    199 		case EAST:
    200 			switch(thisway){
    201 				case LEFT:
    202 					direction = NORTH;
    203 					break;
    204 				case RIGHT:
    205 					direction = SOUTH;
    206 					break;
    207 				case BACK:
    208 					direction = WEST;
    209 					break;
    210 			}
    211 			break;
    212 		case WEST:
    213 			switch(thisway){
    214 				case LEFT:
    215 					direction = SOUTH;
    216 					break;
    217 				case RIGHT:
    218 					direction = NORTH;
    219 					break;
    220 				case BACK:
    221 					direction = EAST;
    222 					break;
    223 			}
    224 			break;
    225       }
    226 }
    227