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SPACE 2
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SPACE - Library 2 - Volume 1.iso
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rumors.c
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C/C++ Source or Header
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1986-07-17
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3KB
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112 lines
/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* rumors.c - version 1.0.3 */
#include <stdio.h>
#include "hack.h" /* for RUMORFILE and BSD (index) */
#define RUMORFILE "rumors"
#ifdef DGK
/* Rumors has been entirely rewritten to speed up the access. This is
* essential when working from floppies. Using fseek() the way that's done
* here means rumors following longer rumors are output more often than those
* following shorter rumors. Also, you may see the same rumor more than once
* in a particular game (although the odds are highly against it), but
* this also happens with real fortune cookies. Besides, a person can
* just read the rumor file if they desire. -dgk
*/
long rumors_size;
extern char *index();
extern long ftell();
outrumor()
{
char line[COLNO];
char *endp;
char roomer[FILENAME];
FILE *rumors;
if (rumors_size < 0) /* We couldn't open RUMORFILE */
return;
if(rumors = fopen(RUMORFILE, "r")) {
if (!rumors_size) { /* if this is the first outrumor() */
fseek(rumors, 0L, 2);
rumors_size = ftell(rumors);
}
fseek(rumors, rand() % rumors_size, 0);
fgets(line, COLNO, rumors);
if (!fgets(line, COLNO, rumors)) { /* at EOF ? */
fseek(rumors, 0L, 0); /* seek back to start */
fgets(line, COLNO, rumors);
}
if(endp = index(line, '\n')) *endp = 0;
pline("This cookie has a scrap of paper inside! It reads: ");
pline(line);
fclose(rumors);
} else {
pline("Can't open rumors file!");
rumors_size = -1; /* don't try to open it again */
}
}
#else DGK
#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)));
}
#endif DGK