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Annotation of 43BSDTahoe/games/hack/hack.rumors.c, revision 1.1.1.1

1.1       root        1: /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
                      2: /* hack.rumors.c - version 1.0.3 */
                      3: 
                      4: #include       <stdio.h>
                      5: #include       "hack.h"                /* for RUMORFILE and BSD (index) */
                      6: #define        CHARSZ  8                       /* number of bits in a char */
                      7: extern long *alloc();
                      8: extern char *index();
                      9: int n_rumors = 0;
                     10: int n_used_rumors = -1;
                     11: char *usedbits;
                     12: 
                     13: init_rumors(rumf) register FILE *rumf; {
                     14: register int i;
                     15:        n_used_rumors = 0;
                     16:        while(skipline(rumf)) n_rumors++;
                     17:        rewind(rumf);
                     18:        i = n_rumors/CHARSZ;
                     19:        usedbits = (char *) alloc((unsigned)(i+1));
                     20:        for( ; i>=0; i--) usedbits[i] = 0;
                     21: }
                     22: 
                     23: skipline(rumf) register FILE *rumf; {
                     24: char line[COLNO];
                     25:        while(1) {
                     26:                if(!fgets(line, sizeof(line), rumf)) return(0);
                     27:                if(index(line, '\n')) return(1);
                     28:        }
                     29: }
                     30: 
                     31: outline(rumf) register FILE *rumf; {
                     32: char line[COLNO];
                     33: register char *ep;
                     34:        if(!fgets(line, sizeof(line), rumf)) return;
                     35:        if((ep = index(line, '\n')) != 0) *ep = 0;
                     36:        pline("This cookie has a scrap of paper inside! It reads: ");
                     37:        pline(line);
                     38: }
                     39: 
                     40: outrumor(){
                     41: register int rn,i;
                     42: register FILE *rumf;
                     43:        if(n_rumors <= n_used_rumors ||
                     44:          (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0) return;
                     45:        if(n_used_rumors < 0) init_rumors(rumf);
                     46:        if(!n_rumors) goto none;
                     47:        rn = rn2(n_rumors - n_used_rumors);
                     48:        i = 0;
                     49:        while(rn || used(i)) {
                     50:                (void) skipline(rumf);
                     51:                if(!used(i)) rn--;
                     52:                i++;
                     53:        }
                     54:        usedbits[i/CHARSZ] |= (1 << (i % CHARSZ));
                     55:        n_used_rumors++;
                     56:        outline(rumf);
                     57: none:
                     58:        (void) fclose(rumf);
                     59: }
                     60: 
                     61: used(i) register int i; {
                     62:        return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ)));
                     63: }

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