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parse.c revision 1.2 
      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 }
    103