hack/hack.rumors.c

   1 /*      $NetBSD: hack.rumors.c,v 1.5 2003/04/02 18:36:39 jsm 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 <sys/cdefs.h>
  65 #ifndef lint
  66 __RCSID("$NetBSD: hack.rumors.c,v 1.5 2003/04/02 18:36:39 jsm Exp $");
  67 #endif                          /* not lint */
  68
  69 #include "hack.h"       /* for RUMORFILE and BSD (strchr) */
  70 #include "extern.h"
  71 #define CHARSZ  8               /* number of bits in a char */
  72 int             n_rumors = 0;
  73 int             n_used_rumors = -1;
  74 char           *usedbits;
  75
  76 void
  77 init_rumors(rumf)
  78         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 = (char *) alloc((unsigned) (i + 1));
  87         for (; i >= 0; i--)
  88                 usedbits[i] = 0;
  89 }
  90
  91 int
  92 skipline(rumf)
  93         FILE           *rumf;
  94 {
  95         char            line[COLNO];
  96         while (1) {
  97                 if (!fgets(line, sizeof(line), rumf))
  98                         return (0);
  99                 if (strchr(line, '\n'))
 100                         return (1);
 101         }
 102 }
 103
 104 void
 105 outline(rumf)
 106         FILE           *rumf;
 107 {
 108         char            line[COLNO];
 109         char           *ep;
 110         if (!fgets(line, sizeof(line), rumf))
 111                 return;
 112         if ((ep = strchr(line, '\n')) != 0)
 113                 *ep = 0;
 114         pline("This cookie has a scrap of paper inside! It reads: ");
 115         pline(line);
 116 }
 117
 118 void
 119 outrumor()
 120 {
 121         int             rn, i;
 122         FILE           *rumf;
 123         if (n_rumors <= n_used_rumors ||
 124             (rumf = fopen(RUMORFILE, "r")) == (FILE *) 0)
 125                 return;
 126         if (n_used_rumors < 0)
 127                 init_rumors(rumf);
 128         if (!n_rumors)
 129                 goto none;
 130         rn = rn2(n_rumors - n_used_rumors);
 131         i = 0;
 132         while (rn || used(i)) {
 133                 (void) skipline(rumf);
 134                 if (!used(i))
 135                         rn--;
 136                 i++;
 137         }
 138         usedbits[i / CHARSZ] |= (1 << (i % CHARSZ));
 139         n_used_rumors++;
 140         outline(rumf);
 141 none:
 142         (void) fclose(rumf);
 143 }
 144
 145 int
 146 used(i)
 147         int             i;
 148 {
 149         return (usedbits[i / CHARSZ] & (1 << (i % CHARSZ)));
 150 }