BSD 4_3_Net_2 release

[unix-history] / usr / src / games / hack / hack.rumors.c

/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.rumors.c - version 1.0.3 */

#include        <stdio.h>
#include        "hack.h"                /* for RUMORFILE and BSD (index) */
#define CHARSZ  8                       /* number of bits in a char */
extern long *alloc();
extern char *index();
int n_rumors = 0;
int n_used_rumors = -1;
char *usedbits;

init_rumors(rumf) register FILE *rumf; {
register int i;
       n_used_rumors = 0;
       while(skipline(rumf)) n_rumors++;
       rewind(rumf);
       i = n_rumors/CHARSZ;
       usedbits = (char *) alloc((unsigned)(i+1));
       for( ; i>=0; i--) usedbits[i] = 0;
}

skipline(rumf) register FILE *rumf; {
char line[COLNO];
       while(1) {
               if(!fgets(line, sizeof(line), rumf)) return(0);
               if(index(line, '\n')) return(1);
       }
}

outline(rumf) register FILE *rumf; {
char line[COLNO];
register char *ep;
       if(!fgets(line, sizeof(line), rumf)) return;
       if((ep = index(line, '\n')) != 0) *ep = 0;
       pline("This cookie has a scrap of paper inside! It reads: ");
       pline(line);
}

outrumor(){
register int rn,i;
register FILE *rumf;
       if(n_rumors <= n_used_rumors ||
         (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0) return;
       if(n_used_rumors < 0) init_rumors(rumf);
       if(!n_rumors) goto none;
       rn = rn2(n_rumors - n_used_rumors);
       i = 0;
       while(rn || used(i)) {
               (void) skipline(rumf);
               if(!used(i)) rn--;
               i++;
       }
       usedbits[i/CHARSZ] |= (1 << (i % CHARSZ));
       n_used_rumors++;
       outline(rumf);
none:
       (void) fclose(rumf);
}

used(i) register int i; {
       return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ)));
}