1 /* $NetBSD: hack.rumors.c,v 1.9 2011/08/06 20:18:26 dholland Exp $ */
2
3 /*
4 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
5 * Amsterdam
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * - Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
14 *
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * - Neither the name of the Stichting Centrum voor Wiskunde en
20 * Informatica, nor the names of its contributors may be used to endorse or
21 * promote products derived from this software without specific prior
22 * written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
25 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
26 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
27 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
28 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
31 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
32 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
33 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
34 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 /*
38 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
39 * All rights reserved.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 * 3. The name of the author may not be used to endorse or promote products
50 * derived from this software without specific prior written permission.
51 *
52 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
53 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
54 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
55 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
56 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
57 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
58 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
59 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
60 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
61 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62 */
63
64 #include "hack.h" /* for RUMORFILE and BSD (strchr) */
65 #include "extern.h"
66 #define CHARSZ 8 /* number of bits in a char */
67
68 static int n_rumors = 0;
69 static int n_used_rumors = -1;
70 static char *usedbits;
71
72 static void init_rumors(FILE *);
73 static int skipline(FILE *);
74 static void outline(FILE *);
75 static int used(int);
76
77 static void
init_rumors(FILE * rumf)78 init_rumors(FILE *rumf)
79 {
80 int i;
81 n_used_rumors = 0;
82 while (skipline(rumf))
83 n_rumors++;
84 rewind(rumf);
85 i = n_rumors / CHARSZ;
86 usedbits = alloc(i + 1);
87 for (; i >= 0; i--)
88 usedbits[i] = 0;
89 }
90
91 static int
skipline(FILE * rumf)92 skipline(FILE *rumf)
93 {
94 char line[COLNO];
95 while (1) {
96 if (!fgets(line, sizeof(line), rumf))
97 return (0);
98 if (strchr(line, '\n'))
99 return (1);
100 }
101 }
102
103 static void
outline(FILE * rumf)104 outline(FILE *rumf)
105 {
106 char line[COLNO];
107 char *ep;
108 if (!fgets(line, sizeof(line), rumf))
109 return;
110 if ((ep = strchr(line, '\n')) != 0)
111 *ep = 0;
112 pline("This cookie has a scrap of paper inside! It reads: ");
113 pline("%s", line);
114 }
115
116 void
outrumor(void)117 outrumor(void)
118 {
119 int rn, i;
120 FILE *rumf;
121 if (n_rumors <= n_used_rumors ||
122 (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0)
123 return;
124 if (n_used_rumors < 0)
125 init_rumors(rumf);
126 if (!n_rumors)
127 goto none;
128 rn = rn2(n_rumors - n_used_rumors);
129 i = 0;
130 while (rn || used(i)) {
131 (void) skipline(rumf);
132 if (!used(i))
133 rn--;
134 i++;
135 }
136 usedbits[i / CHARSZ] |= (1 << (i % CHARSZ));
137 n_used_rumors++;
138 outline(rumf);
139 none:
140 (void) fclose(rumf);
141 }
142
143 static int
used(int i)144 used(int i)
145 {
146 return (usedbits[i / CHARSZ] & (1 << (i % CHARSZ)));
147 }
148