94 lines
1.7 KiB
C
94 lines
1.7 KiB
C
/* $NetBSD: hack.rumors.c,v 1.4 1997/10/19 16:58:55 christos Exp $ */
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/*
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* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: hack.rumors.c,v 1.4 1997/10/19 16:58:55 christos Exp $");
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#endif /* not lint */
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#include "hack.h" /* for RUMORFILE and BSD (strchr) */
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#include "extern.h"
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#define CHARSZ 8 /* number of bits in a char */
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int n_rumors = 0;
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int n_used_rumors = -1;
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char *usedbits;
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void
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init_rumors(rumf)
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FILE *rumf;
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{
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int i;
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n_used_rumors = 0;
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while (skipline(rumf))
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n_rumors++;
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rewind(rumf);
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i = n_rumors / CHARSZ;
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usedbits = (char *) alloc((unsigned) (i + 1));
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for (; i >= 0; i--)
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usedbits[i] = 0;
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}
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int
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skipline(rumf)
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FILE *rumf;
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{
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char line[COLNO];
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while (1) {
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if (!fgets(line, sizeof(line), rumf))
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return (0);
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if (strchr(line, '\n'))
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return (1);
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}
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}
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void
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outline(rumf)
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FILE *rumf;
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{
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char line[COLNO];
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char *ep;
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if (!fgets(line, sizeof(line), rumf))
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return;
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if ((ep = strchr(line, '\n')) != 0)
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*ep = 0;
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pline("This cookie has a scrap of paper inside! It reads: ");
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pline(line);
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}
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void
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outrumor()
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{
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int rn, i;
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FILE *rumf;
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if (n_rumors <= n_used_rumors ||
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(rumf = fopen(RUMORFILE, "r")) == (FILE *) 0)
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return;
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if (n_used_rumors < 0)
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init_rumors(rumf);
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if (!n_rumors)
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goto none;
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rn = rn2(n_rumors - n_used_rumors);
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i = 0;
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while (rn || used(i)) {
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(void) skipline(rumf);
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if (!used(i))
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rn--;
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i++;
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}
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usedbits[i / CHARSZ] |= (1 << (i % CHARSZ));
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n_used_rumors++;
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outline(rumf);
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none:
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(void) fclose(rumf);
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}
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int
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used(i)
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int i;
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{
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return (usedbits[i / CHARSZ] & (1 << (i % CHARSZ)));
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}
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