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getword.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[] = "@(#)getword.c	5.3 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 # include	"hangman.h"
     39 
     40 # if pdp11
     41 #	define	RN	(((off_t) rand() << 16) | (off_t) rand())
     42 # else
     43 #	define	RN	rand()
     44 # endif
     45 
     46 /*
     47  * getword:
     48  *	Get a valid word out of the dictionary file
     49  */
     50 getword()
     51 {
     52 	register FILE		*inf;
     53 	register char		*wp, *gp;
     54 
     55 	inf = Dict;
     56 	for (;;) {
     57 		fseek(inf, abs(RN % Dict_size), 0);
     58 		if (fgets(Word, BUFSIZ, inf) == NULL)
     59 			continue;
     60 		if (fgets(Word, BUFSIZ, inf) == NULL)
     61 			continue;
     62 		Word[strlen(Word) - 1] = '\0';
     63 		if (strlen(Word) < MINLEN)
     64 			continue;
     65 		for (wp = Word; *wp; wp++)
     66 			if (!islower(*wp))
     67 				goto cont;
     68 		break;
     69 cont:		;
     70 	}
     71 	gp = Known;
     72 	wp = Word;
     73 	while (*wp) {
     74 		*gp++ = '-';
     75 		wp++;
     76 	}
     77 	*gp = '\0';
     78 }
     79 
     80 /*
     81  * abs:
     82  *	Return the absolute value of an integer
     83  */
     84 off_t
     85 abs(i)
     86 off_t	i;
     87 {
     88 	if (i < 0)
     89 		return -(off_t) i;
     90 	else
     91 		return (off_t) i;
     92 }
     93