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