1 /* 2 * Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. 3 */ 4 5 #ifndef lint 6 static char rcsid[] = "$NetBSD: hack.rumors.c,v 1.3 1995/03/23 08:31:24 cgd Exp $"; 7 #endif /* not lint */ 8 9 #include <stdio.h> 10 #include "hack.h" /* for RUMORFILE and BSD (index) */ 11 #define CHARSZ 8 /* number of bits in a char */ 12 extern long *alloc(); 13 extern char *index(); 14 int n_rumors = 0; 15 int n_used_rumors = -1; 16 char *usedbits; 17 18 init_rumors(rumf) register FILE *rumf; { 19 register int i; 20 n_used_rumors = 0; 21 while(skipline(rumf)) n_rumors++; 22 rewind(rumf); 23 i = n_rumors/CHARSZ; 24 usedbits = (char *) alloc((unsigned)(i+1)); 25 for( ; i>=0; i--) usedbits[i] = 0; 26 } 27 28 skipline(rumf) register FILE *rumf; { 29 char line[COLNO]; 30 while(1) { 31 if(!fgets(line, sizeof(line), rumf)) return(0); 32 if(index(line, '\n')) return(1); 33 } 34 } 35 36 outline(rumf) register FILE *rumf; { 37 char line[COLNO]; 38 register char *ep; 39 if(!fgets(line, sizeof(line), rumf)) return; 40 if((ep = index(line, '\n')) != 0) *ep = 0; 41 pline("This cookie has a scrap of paper inside! It reads: "); 42 pline(line); 43 } 44 45 outrumor(){ 46 register int rn,i; 47 register FILE *rumf; 48 if(n_rumors <= n_used_rumors || 49 (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0) return; 50 if(n_used_rumors < 0) init_rumors(rumf); 51 if(!n_rumors) goto none; 52 rn = rn2(n_rumors - n_used_rumors); 53 i = 0; 54 while(rn || used(i)) { 55 (void) skipline(rumf); 56 if(!used(i)) rn--; 57 i++; 58 } 59 usedbits[i/CHARSZ] |= (1 << (i % CHARSZ)); 60 n_used_rumors++; 61 outline(rumf); 62 none: 63 (void) fclose(rumf); 64 } 65 66 used(i) register int i; { 67 return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ))); 68 } 69