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      1 /*	$NetBSD: room.c,v 1.15 2021/05/02 12:50:43 rillig Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)room.c	8.2 (Berkeley) 4/28/95";
     36 #else
     37 __RCSID("$NetBSD: room.c,v 1.15 2021/05/02 12:50:43 rillig Exp $");
     38 #endif
     39 #endif				/* not lint */
     40 
     41 #include "extern.h"
     42 
     43 void
     44 writedes(void)
     45 {
     46 	int     compass;
     47 	const char   *p;
     48 	int     c;
     49 
     50 	printf("\n\t%s\n", location[position].name);
     51 	if (beenthere[position] < ROOMDESC || verbose) {
     52 		compass = NORTH;
     53 		for (p = location[position].desc; (c = *p++) != 0;)
     54 			if (c != '-' && c != '*' && c != '+') {
     55 				if (c == '=')
     56 					putchar('-');
     57 				else
     58 					putchar(c);
     59 			} else {
     60 				if (c != '*')
     61 					printf("%s", truedirec(compass, c));
     62 				compass++;
     63 			}
     64 	}
     65 }
     66 
     67 void
     68 printobjs(void)
     69 {
     70 	unsigned int *p = location[position].objects;
     71 	int     n;
     72 
     73 	printf("\n");
     74 	for (n = 0; n < NUMOFOBJECTS; n++)
     75 		if (testbit(p, n) && objdes[n])
     76 			puts(objdes[n]);
     77 }
     78 
     79 void
     80 whichway(struct room here)
     81 {
     82 	switch (direction) {
     83 
     84 	case NORTH:
     85 		left = here.west;
     86 		right = here.east;
     87 		ahead = here.north;
     88 		back = here.south;
     89 		break;
     90 
     91 	case SOUTH:
     92 		left = here.east;
     93 		right = here.west;
     94 		ahead = here.south;
     95 		back = here.north;
     96 		break;
     97 
     98 	case EAST:
     99 		left = here.north;
    100 		right = here.south;
    101 		ahead = here.east;
    102 		back = here.west;
    103 		break;
    104 
    105 	case WEST:
    106 		left = here.south;
    107 		right = here.north;
    108 		ahead = here.west;
    109 		back = here.east;
    110 		break;
    111 
    112 	}
    113 }
    114 
    115 const char *
    116 truedirec(int way, int option)
    117 {
    118 	switch (way) {
    119 
    120 	case NORTH:
    121 		switch (direction) {
    122 		case NORTH:
    123 			return ("ahead");
    124 		case SOUTH:
    125 			return (option == '+' ? "behind you" :
    126 			    "back");
    127 		case EAST:
    128 			return ("left");
    129 		case WEST:
    130 			return ("right");
    131 		}
    132 		break;
    133 
    134 	case SOUTH:
    135 		switch (direction) {
    136 		case NORTH:
    137 			return (option == '+' ? "behind you" :
    138 			    "back");
    139 		case SOUTH:
    140 			return ("ahead");
    141 		case EAST:
    142 			return ("right");
    143 		case WEST:
    144 			return ("left");
    145 		}
    146 		break;
    147 
    148 	case EAST:
    149 		switch (direction) {
    150 		case NORTH:
    151 			return ("right");
    152 		case SOUTH:
    153 			return ("left");
    154 		case EAST:
    155 			return ("ahead");
    156 		case WEST:
    157 			return (option == '+' ? "behind you" :
    158 			    "back");
    159 		}
    160 		break;
    161 
    162 	case WEST:
    163 		switch (direction) {
    164 		case NORTH:
    165 			return ("left");
    166 		case SOUTH:
    167 			return ("right");
    168 		case EAST:
    169 			return (option == '+' ? "behind you" :
    170 			    "back");
    171 		case WEST:
    172 			return ("ahead");
    173 		}
    174 		break;
    175 	}
    176 
    177 	printf("Error: room %d.  More than four directions wanted.",
    178 	    position);
    179 	return ("!!");
    180 }
    181 
    182 void
    183 newway(int thisway)
    184 {
    185 	switch (direction) {
    186 
    187 	case NORTH:
    188 		switch (thisway) {
    189 		case LEFT:
    190 			direction = WEST;
    191 			break;
    192 		case RIGHT:
    193 			direction = EAST;
    194 			break;
    195 		case BACK:
    196 			direction = SOUTH;
    197 			break;
    198 		}
    199 		break;
    200 	case SOUTH:
    201 		switch (thisway) {
    202 		case LEFT:
    203 			direction = EAST;
    204 			break;
    205 		case RIGHT:
    206 			direction = WEST;
    207 			break;
    208 		case BACK:
    209 			direction = NORTH;
    210 			break;
    211 		}
    212 		break;
    213 	case EAST:
    214 		switch (thisway) {
    215 		case LEFT:
    216 			direction = NORTH;
    217 			break;
    218 		case RIGHT:
    219 			direction = SOUTH;
    220 			break;
    221 		case BACK:
    222 			direction = WEST;
    223 			break;
    224 		}
    225 		break;
    226 	case WEST:
    227 		switch (thisway) {
    228 		case LEFT:
    229 			direction = SOUTH;
    230 			break;
    231 		case RIGHT:
    232 			direction = NORTH;
    233 			break;
    234 		case BACK:
    235 			direction = EAST;
    236 			break;
    237 		}
    238 		break;
    239 	}
    240 }
    241