battlestar/parse.c

   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[] = "from: @(#)parse.c     5.3 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: parse.c,v 1.2 1993/08/01 18:55:53 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 #include "externs.h"
  40
  41 wordinit()
  42 {
  43         register struct wlist *w;
  44
  45         for (w = wlist; w->string; w++)
  46                 install(w);
  47 }
  48
  49 hash(s)
  50         register char *s;
  51 {
  52         register hashval = 0;
  53
  54         while (*s) {
  55                 hashval += *s++;
  56                 hashval *= HASHMUL;
  57                 hashval &= HASHMASK;
  58         }
  59         return hashval;
  60 }
  61
  62 struct wlist *
  63 lookup(s)
  64         char *s;
  65 {
  66         register struct wlist *wp;
  67
  68         for (wp = hashtab[hash(s)]; wp != NULL; wp = wp->next)
  69                 if (*s == *wp->string && strcmp(s, wp->string) == 0)
  70                         return wp;
  71         return NULL;
  72 }
  73
  74 install(wp)
  75         register struct wlist *wp;
  76 {
  77         int hashval;
  78
  79         if (lookup(wp->string) == NULL) {
  80                 hashval = hash(wp->string);
  81                 wp->next = hashtab[hashval];
  82                 hashtab[hashval] = wp;
  83         } else
  84                 printf("Multiply defined %s.\n", wp->string);
  85 }
  86
  87 parse()
  88 {
  89         register struct wlist *wp;
  90         register n;
  91
  92         wordnumber = 0;           /* for cypher */
  93         for (n = 0; n <= wordcount; n++) {
  94                 if ((wp = lookup(words[n])) == NULL) {
  95                         wordvalue[n] = -1;
  96                         wordtype[n] = -1;
  97                 } else {
  98                         wordvalue[n] = wp -> value;
  99                         wordtype[n] = wp -> article;
 100                 }
 101         }
 102 }