706 lines
15 KiB
C
706 lines
15 KiB
C
/* $NetBSD: input.c,v 1.24 2009/08/12 04:48:03 dholland Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ed James.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
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*
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* Copy permission is hereby granted provided that this notice is
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* retained on all partial or complete copies.
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*
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* For more info on this and all of my stuff, mail edjames@berkeley.edu.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)input.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: input.c,v 1.24 2009/08/12 04:48:03 dholland Exp $");
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#endif
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#endif /* not lint */
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#include "include.h"
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#include "pathnames.h"
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static void rezero(void);
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static void noise(void);
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static int gettoken(void);
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static const char *setplane(int);
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static const char *turn(int);
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static const char *circle(int);
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static const char *left(int);
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static const char *right(int);
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static const char *Left(int);
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static const char *Right(int);
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static const char *delayb(int);
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static const char *beacon(int);
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static const char *ex_it(int);
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static const char *airport(int);
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static const char *climb(int);
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static const char *descend(int);
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static const char *setalt(int);
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static const char *setrelalt(int);
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static const char *benum(int);
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static const char *to_dir(int);
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static const char *rel_dir(int);
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static const char *mark(int);
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static const char *unmark(int);
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static const char *ignore(int);
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#define MAXRULES 6
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#define MAXDEPTH 15
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#define RETTOKEN '\n'
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#define REDRAWTOKEN '\014' /* CTRL(L) */
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#define SHELLTOKEN '!'
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#define HELPTOKEN '?'
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#define ALPHATOKEN 256
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#define NUMTOKEN 257
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typedef struct {
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int token;
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int to_state;
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const char *str;
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const char *(*func)(int);
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} RULE;
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typedef struct {
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int num_rules;
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RULE *rule;
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} STATE;
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typedef struct {
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char str[20];
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int state;
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int rule;
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int ch;
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int pos;
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} STACK;
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#define T_RULE stack[level].rule
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#define T_STATE stack[level].state
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#define T_STR stack[level].str
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#define T_POS stack[level].pos
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#define T_CH stack[level].ch
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#define NUMELS(a) (sizeof (a) / sizeof (*(a)))
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#define NUMSTATES NUMELS(st)
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static
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RULE state0[] = { { ALPHATOKEN, 1, "%c:", setplane},
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{ RETTOKEN, -1, "", NULL },
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{ HELPTOKEN, 12, " [a-z]<ret>", NULL }},
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state1[] = { { 't', 2, " turn", turn },
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{ 'a', 3, " altitude:", NULL },
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{ 'c', 4, " circle", circle },
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{ 'm', 7, " mark", mark },
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{ 'u', 7, " unmark", unmark },
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{ 'i', 7, " ignore", ignore },
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{ HELPTOKEN, 12, " tacmui", NULL }},
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state2[] = { { 'l', 6, " left", left },
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{ 'r', 6, " right", right },
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{ 'L', 4, " left 90", Left },
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{ 'R', 4, " right 90", Right },
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{ 't', 11, " towards", NULL },
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{ 'w', 4, " to 0", to_dir },
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{ 'e', 4, " to 45", to_dir },
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{ 'd', 4, " to 90", to_dir },
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{ 'c', 4, " to 135", to_dir },
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{ 'x', 4, " to 180", to_dir },
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{ 'z', 4, " to 225", to_dir },
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{ 'a', 4, " to 270", to_dir },
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{ 'q', 4, " to 315", to_dir },
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{ HELPTOKEN, 12, " lrLRt<dir>", NULL }},
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state3[] = { { '+', 10, " climb", climb },
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{ 'c', 10, " climb", climb },
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{ '-', 10, " descend", descend },
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{ 'd', 10, " descend", descend },
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{ NUMTOKEN, 7, " %c000 feet", setalt },
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{ HELPTOKEN, 12, " +-cd[0-9]", NULL }},
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state4[] = { { '@', 9, " at", NULL },
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{ 'a', 9, " at", NULL },
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{ RETTOKEN, -1, "", NULL },
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{ HELPTOKEN, 12, " @a<ret>", NULL }},
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state5[] = { { NUMTOKEN, 7, "%c", delayb },
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{ HELPTOKEN, 12, " [0-9]", NULL }},
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state6[] = { { '@', 9, " at", NULL },
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{ 'a', 9, " at", NULL },
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{ 'w', 4, " 0", rel_dir },
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{ 'e', 4, " 45", rel_dir },
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{ 'd', 4, " 90", rel_dir },
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{ 'c', 4, " 135", rel_dir },
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{ 'x', 4, " 180", rel_dir },
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{ 'z', 4, " 225", rel_dir },
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{ 'a', 4, " 270", rel_dir },
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{ 'q', 4, " 315", rel_dir },
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{ RETTOKEN, -1, "", NULL },
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{ HELPTOKEN, 12, " @a<dir><ret>",NULL }},
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state7[] = { { RETTOKEN, -1, "", NULL },
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{ HELPTOKEN, 12, " <ret>", NULL }},
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state8[] = { { NUMTOKEN, 4, "%c", benum },
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{ HELPTOKEN, 12, " [0-9]", NULL }},
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state9[] = { { 'b', 5, " beacon #", NULL },
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{ '*', 5, " beacon #", NULL },
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{ HELPTOKEN, 12, " b*", NULL }},
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state10[] = { { NUMTOKEN, 7, " %c000 ft", setrelalt},
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{ HELPTOKEN, 12, " [0-9]", NULL }},
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state11[] = { { 'b', 8, " beacon #", beacon },
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{ '*', 8, " beacon #", beacon },
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{ 'e', 8, " exit #", ex_it },
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{ 'a', 8, " airport #", airport },
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{ HELPTOKEN, 12, " b*ea", NULL }},
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state12[] = { { -1, -1, "", NULL }};
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#define DEF_STATE(s) { NUMELS(s), (s) }
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static STATE st[] = {
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DEF_STATE(state0), DEF_STATE(state1), DEF_STATE(state2),
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DEF_STATE(state3), DEF_STATE(state4), DEF_STATE(state5),
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DEF_STATE(state6), DEF_STATE(state7), DEF_STATE(state8),
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DEF_STATE(state9), DEF_STATE(state10), DEF_STATE(state11),
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DEF_STATE(state12)
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};
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static PLANE p;
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static STACK stack[MAXDEPTH];
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static int level;
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static int tval;
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static int dest_type, dest_no, dir;
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static int
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pop(void)
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{
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if (level == 0)
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return (-1);
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level--;
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ioclrtoeol(T_POS);
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(void)strcpy(T_STR, "");
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T_RULE = -1;
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T_CH = -1;
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return (0);
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}
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static void
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rezero(void)
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{
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iomove(0);
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level = 0;
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T_STATE = 0;
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T_RULE = -1;
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T_CH = -1;
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T_POS = 0;
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(void)strcpy(T_STR, "");
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}
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static void
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push(int ruleno, int ch)
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{
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int newstate, newpos;
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assert(level < (MAXDEPTH - 1));
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(void)snprintf(T_STR, sizeof(T_STR),
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st[T_STATE].rule[ruleno].str, tval);
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T_RULE = ruleno;
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T_CH = ch;
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newstate = st[T_STATE].rule[ruleno].to_state;
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newpos = T_POS + strlen(T_STR);
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ioaddstr(T_POS, T_STR);
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if (level == 0)
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ioclrtobot();
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level++;
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T_STATE = newstate;
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T_POS = newpos;
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T_RULE = -1;
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(void)strcpy(T_STR, "");
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}
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int
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getcommand(void)
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{
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int c, i, done;
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const char *s, *(*func)(int);
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PLANE *pp;
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rezero();
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do {
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c = gettoken();
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if (c == tty_new.c_cc[VERASE]) {
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if (pop() < 0)
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noise();
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} else if (c == tty_new.c_cc[VKILL]) {
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while (pop() >= 0)
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;
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} else {
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done = 0;
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for (i = 0; i < st[T_STATE].num_rules; i++) {
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if (st[T_STATE].rule[i].token == c ||
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st[T_STATE].rule[i].token == tval) {
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push(i, (c >= ALPHATOKEN) ? tval : c);
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done = 1;
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break;
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}
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}
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if (!done)
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noise();
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}
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} while (T_STATE != -1);
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if (level == 1)
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return (1); /* forced update */
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dest_type = T_NODEST;
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for (i = 0; i < level; i++) {
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func = st[stack[i].state].rule[stack[i].rule].func;
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if (func != NULL)
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if ((s = (*func)(stack[i].ch)) != NULL) {
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ioerror(stack[i].pos,
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(int)strlen(stack[i].str), s);
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return (-1);
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}
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}
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pp = findplane(p.plane_no);
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if (pp->new_altitude != p.new_altitude)
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pp->new_altitude = p.new_altitude;
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else if (pp->status != p.status)
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pp->status = p.status;
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else {
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pp->new_dir = p.new_dir;
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pp->delayd = p.delayd;
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pp->delayd_no = p.delayd_no;
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}
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return (0);
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}
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static void
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noise(void)
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{
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(void)putchar('\07');
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(void)fflush(stdout);
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}
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static int
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gettoken(void)
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{
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while ((tval = getAChar()) == REDRAWTOKEN || tval == SHELLTOKEN)
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{
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if (tval == SHELLTOKEN)
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{
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#ifdef BSD
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struct itimerval itv;
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itv.it_value.tv_sec = 0;
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itv.it_value.tv_usec = 0;
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(void)setitimer(ITIMER_REAL, &itv, NULL);
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#endif
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#ifdef SYSV
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int aval;
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aval = alarm(0);
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#endif
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if (fork() == 0) /* child */
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{
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char *shell, *base;
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done_screen();
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/* run user's favorite shell */
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if ((shell = getenv("SHELL")) != NULL)
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{
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base = strrchr(shell, '/');
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if (base == NULL)
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base = shell;
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else
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base++;
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(void)execl(shell, base, (char *) 0);
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}
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else
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(void)execl(_PATH_BSHELL, "sh",
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(char *) 0);
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exit(0); /* oops */
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}
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(void)wait(0);
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(void)tcsetattr(fileno(stdin), TCSADRAIN, &tty_new);
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#ifdef BSD
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itv.it_value.tv_sec = 0;
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itv.it_value.tv_usec = 1;
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itv.it_interval.tv_sec = sp->update_secs;
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itv.it_interval.tv_usec = 0;
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(void)setitimer(ITIMER_REAL, &itv, NULL);
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#endif
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#ifdef SYSV
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alarm(aval);
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#endif
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}
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(void)redraw();
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}
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if (isdigit(tval))
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return (NUMTOKEN);
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else if (isalpha(tval))
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return (ALPHATOKEN);
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else
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return (tval);
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}
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static const char *
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setplane(int c)
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{
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PLANE *pp;
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pp = findplane(number(c));
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if (pp == NULL)
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return ("Unknown Plane");
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(void)memcpy(&p, pp, sizeof (p));
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p.delayd = 0;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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turn(int c __unused)
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{
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if (p.altitude == 0)
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return ("Planes at airports may not change direction");
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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circle(int c __unused)
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{
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if (p.altitude == 0)
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return ("Planes cannot circle on the ground");
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p.new_dir = MAXDIR;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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left(int c __unused)
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{
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dir = D_LEFT;
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p.new_dir = p.dir - 1;
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if (p.new_dir < 0)
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p.new_dir += MAXDIR;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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right(int c __unused)
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{
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dir = D_RIGHT;
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p.new_dir = p.dir + 1;
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if (p.new_dir >= MAXDIR)
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p.new_dir -= MAXDIR;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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Left(int c __unused)
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{
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p.new_dir = p.dir - 2;
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if (p.new_dir < 0)
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p.new_dir += MAXDIR;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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Right(int c __unused)
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{
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p.new_dir = p.dir + 2;
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if (p.new_dir >= MAXDIR)
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p.new_dir -= MAXDIR;
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return (NULL);
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}
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static const char *
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delayb(int c)
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{
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int xdiff, ydiff;
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c -= '0';
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if (c >= sp->num_beacons)
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return ("Unknown beacon");
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xdiff = sp->beacon[(int)c].x - p.xpos;
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xdiff = SGN(xdiff);
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ydiff = sp->beacon[(int)c].y - p.ypos;
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ydiff = SGN(ydiff);
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if (xdiff != displacement[p.dir].dx || ydiff != displacement[p.dir].dy)
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return ("Beacon is not in flight path");
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p.delayd = 1;
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p.delayd_no = c;
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if (dest_type != T_NODEST) {
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switch (dest_type) {
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case T_BEACON:
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xdiff = sp->beacon[dest_no].x - sp->beacon[(int)c].x;
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ydiff = sp->beacon[dest_no].y - sp->beacon[(int)c].y;
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break;
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case T_EXIT:
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xdiff = sp->exit[dest_no].x - sp->beacon[(int)c].x;
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ydiff = sp->exit[dest_no].y - sp->beacon[(int)c].y;
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break;
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case T_AIRPORT:
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xdiff = sp->airport[dest_no].x - sp->beacon[(int)c].x;
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ydiff = sp->airport[dest_no].y - sp->beacon[(int)c].y;
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break;
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default:
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return ("Bad case in delayb! Get help!");
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}
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if (xdiff == 0 && ydiff == 0)
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return ("Would already be there");
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p.new_dir = DIR_FROM_DXDY(xdiff, ydiff);
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if (p.new_dir == p.dir)
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return ("Already going in that direction");
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}
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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beacon(int c __unused)
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{
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dest_type = T_BEACON;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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ex_it(int c __unused)
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{
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dest_type = T_EXIT;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
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airport(int c __unused)
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{
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dest_type = T_AIRPORT;
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return (NULL);
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}
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/* ARGSUSED */
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static const char *
|
|
climb(int c __unused)
|
|
{
|
|
dir = D_UP;
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|
return (NULL);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static const char *
|
|
descend(int c __unused)
|
|
{
|
|
dir = D_DOWN;
|
|
return (NULL);
|
|
}
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|
|
|
static const char *
|
|
setalt(int c)
|
|
{
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|
int newalt = c - '0';
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|
if ((p.altitude == newalt) && (p.new_altitude == p.altitude))
|
|
return ("Already at that altitude");
|
|
if (p.new_altitude == newalt) {
|
|
return ("Already going to that altitude");
|
|
}
|
|
p.new_altitude = newalt;
|
|
return (NULL);
|
|
}
|
|
|
|
static const char *
|
|
setrelalt(int c)
|
|
{
|
|
int newalt;
|
|
|
|
if (c == 0)
|
|
return ("altitude not changed");
|
|
|
|
switch (dir) {
|
|
case D_UP:
|
|
newalt = p.altitude + c - '0';
|
|
break;
|
|
case D_DOWN:
|
|
newalt = p.altitude - (c - '0');
|
|
break;
|
|
default:
|
|
return ("Unknown case in setrelalt! Get help!");
|
|
}
|
|
|
|
if (p.new_altitude == newalt)
|
|
return ("Already going to that altitude");
|
|
|
|
p.new_altitude = newalt;
|
|
|
|
if (p.new_altitude < 0)
|
|
return ("Altitude would be too low");
|
|
else if (p.new_altitude > 9)
|
|
return ("Altitude would be too high");
|
|
return (NULL);
|
|
}
|
|
|
|
static const char *
|
|
benum(int c)
|
|
{
|
|
dest_no = c -= '0';
|
|
|
|
switch (dest_type) {
|
|
case T_BEACON:
|
|
if (c >= sp->num_beacons)
|
|
return ("Unknown beacon");
|
|
p.new_dir = DIR_FROM_DXDY(sp->beacon[(int)c].x - p.xpos,
|
|
sp->beacon[(int)c].y - p.ypos);
|
|
break;
|
|
case T_EXIT:
|
|
if (c >= sp->num_exits)
|
|
return ("Unknown exit");
|
|
p.new_dir = DIR_FROM_DXDY(sp->exit[(int)c].x - p.xpos,
|
|
sp->exit[(int)c].y - p.ypos);
|
|
break;
|
|
case T_AIRPORT:
|
|
if (c >= sp->num_airports)
|
|
return ("Unknown airport");
|
|
p.new_dir = DIR_FROM_DXDY(sp->airport[(int)c].x - p.xpos,
|
|
sp->airport[(int)c].y - p.ypos);
|
|
break;
|
|
default:
|
|
return ("Unknown case in benum! Get help!");
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static const char *
|
|
to_dir(int c)
|
|
{
|
|
p.new_dir = dir_no(c);
|
|
return (NULL);
|
|
}
|
|
|
|
static const char *
|
|
rel_dir(int c)
|
|
{
|
|
int angle;
|
|
|
|
angle = dir_no(c);
|
|
switch (dir) {
|
|
case D_LEFT:
|
|
p.new_dir = p.dir - angle;
|
|
if (p.new_dir < 0)
|
|
p.new_dir += MAXDIR;
|
|
break;
|
|
case D_RIGHT:
|
|
p.new_dir = p.dir + angle;
|
|
if (p.new_dir >= MAXDIR)
|
|
p.new_dir -= MAXDIR;
|
|
break;
|
|
default:
|
|
return ("Bizarre direction in rel_dir! Get help!");
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static const char *
|
|
mark(int c __unused)
|
|
{
|
|
if (p.altitude == 0)
|
|
return ("Cannot mark planes on the ground");
|
|
if (p.status == S_MARKED)
|
|
return ("Already marked");
|
|
p.status = S_MARKED;
|
|
return (NULL);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static const char *
|
|
unmark(int c __unused)
|
|
{
|
|
if (p.altitude == 0)
|
|
return ("Cannot unmark planes on the ground");
|
|
if (p.status == S_UNMARKED)
|
|
return ("Already unmarked");
|
|
p.status = S_UNMARKED;
|
|
return (NULL);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static const char *
|
|
ignore(int c __unused)
|
|
{
|
|
if (p.altitude == 0)
|
|
return ("Cannot ignore planes on the ground");
|
|
if (p.status == S_IGNORED)
|
|
return ("Already ignored");
|
|
p.status = S_IGNORED;
|
|
return (NULL);
|
|
}
|
|
|
|
int
|
|
dir_no(int ch)
|
|
{
|
|
int dirno;
|
|
|
|
dirno = -1;
|
|
switch (ch) {
|
|
case 'w': dirno = 0; break;
|
|
case 'e': dirno = 1; break;
|
|
case 'd': dirno = 2; break;
|
|
case 'c': dirno = 3; break;
|
|
case 'x': dirno = 4; break;
|
|
case 'z': dirno = 5; break;
|
|
case 'a': dirno = 6; break;
|
|
case 'q': dirno = 7; break;
|
|
default:
|
|
(void)fprintf(stderr, "bad character in dir_no\n");
|
|
break;
|
|
}
|
|
return (dirno);
|
|
}
|