1 /* $OpenBSD: hack.rumors.c,v 1.10 2016/03/16 15:00:35 mestre 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 <err.h>
65 #include <stdio.h>
66
67 #include "hack.h" /* for RUMORFILE and BSD (index) */
68
69 #define CHARSZ 8 /* number of bits in a char */
70 int n_rumors = 0;
71 int n_used_rumors = -1;
72 char *usedbits;
73
74 static void init_rumors(FILE *);
75 static int skipline(FILE *);
76 static void outline(FILE *);
77 static int used(int);
78
79 static void
init_rumors(FILE * rumf)80 init_rumors(FILE *rumf)
81 {
82 int i;
83
84 n_used_rumors = 0;
85 while(skipline(rumf)) n_rumors++;
86 if (fseek(rumf, 0L, SEEK_SET) == -1)
87 err(1, "fseek");
88 i = n_rumors/CHARSZ;
89 usedbits = (char *) alloc((unsigned)(i+1));
90 for( ; i>=0; i--) usedbits[i] = 0;
91 }
92
93 static int
skipline(FILE * rumf)94 skipline(FILE *rumf)
95 {
96 char line[COLNO];
97
98 while(1) {
99 if(!fgets(line, sizeof(line), rumf)) return(0);
100 if(strchr(line, '\n')) return(1);
101 }
102 }
103
104 static void
outline(FILE * rumf)105 outline(FILE *rumf)
106 {
107 char line[COLNO];
108
109 if(!fgets(line, sizeof(line), rumf)) return;
110 line[strcspn(line, "\n")] = '\0';
111 pline("This cookie has a scrap of paper inside! It reads: ");
112 pline("%s", line);
113 }
114
115 void
outrumor(void)116 outrumor(void)
117 {
118 int rn,i;
119 FILE *rumf;
120
121 if(n_rumors <= n_used_rumors ||
122 (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0) return;
123 if(n_used_rumors < 0) init_rumors(rumf);
124 if(!n_rumors) goto none;
125 rn = rn2(n_rumors - n_used_rumors);
126 i = 0;
127 while(rn || used(i)) {
128 (void) skipline(rumf);
129 if(!used(i)) rn--;
130 i++;
131 }
132 usedbits[i/CHARSZ] |= (1 << (i % CHARSZ));
133 n_used_rumors++;
134 outline(rumf);
135 none:
136 (void) fclose(rumf);
137 }
138
139 static int
used(int i)140 used(int i)
141 {
142 return(usedbits[i/CHARSZ] & (1 << (i % CHARSZ)));
143 }
144