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 } 64