ircd/operhash.c

   1 /* ircd-ratbox: an advanced Internet Relay Chat Daemon(ircd).
   2  * operhash.c - Hashes nick!user@host{oper}
   3  *
   4  * Copyright (C) 2005 Lee Hardy <lee -at- leeh.co.uk>
   5  * Copyright (C) 2005 ircd-ratbox development team
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are
   9  * met:
  10  *
  11  * 1.Redistributions of source code must retain the above copyright notice,
  12  *   this list of conditions and the following disclaimer.
  13  * 2.Redistributions in binary form must reproduce the above copyright
  14  *   notice, this list of conditions and the following disclaimer in the
  15  *   documentation and/or other materials provided with the distribution.
  16  * 3.The name of the author may not be used to endorse or promote products
  17  *   derived from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  23  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  27  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  28  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * $Id: operhash.c 26094 2008-09-19 15:33:46Z androsyn $
  32  */
  33 #include <ratbox_lib.h>
  34 #include "stdinc.h"
  35 #include "match.h"
  36 #include "hash.h"
  37 #include "operhash.h"
  38
  39 #define OPERHASH_MAX_BITS 7
  40 #define OPERHASH_MAX (1<<OPERHASH_MAX_BITS)
  41
  42 #define hash_opername(x) fnv_hash_upper((const unsigned char *)(x), OPERHASH_MAX_BITS)
  43
  44 static rb_dlink_list operhash_table[OPERHASH_MAX];
  45
  46 const char *
  47 operhash_add(const char *name)
  48 {
  49         void *ohash_mem;
  50         char *ohash_copy;
  51         unsigned int hashv;
  52         rb_dlink_node *ptr;
  53
  54         if(EmptyString(name))
  55                 return NULL;
  56
  57         hashv = hash_opername(name);
  58
  59         RB_DLINK_FOREACH(ptr, operhash_table[hashv].head)
  60         {
  61                 ohash_copy = ptr->data;
  62
  63                 if(!irccmp(ohash_copy, name))
  64                 {
  65                         ohash_mem = ohash_copy - 5;
  66                         (*(int32_t *) ohash_mem)++;
  67                         return ohash_copy;
  68                 }
  69         }
  70
  71         ohash_mem = rb_malloc(strlen(name) + 6);
  72         (*(int32_t *) ohash_mem) = 1;
  73         ohash_copy = ohash_mem + 5;
  74         ohash_copy[-1] = '@';
  75         strcpy(ohash_copy, name);
  76
  77         rb_dlinkAddAlloc(ohash_copy, &operhash_table[hashv]);
  78
  79         return ohash_copy;
  80 }
  81
  82 const char *
  83 operhash_find(const char *name)
  84 {
  85         char *ohash_copy;
  86         unsigned int hashv;
  87         rb_dlink_node *ptr;
  88
  89         if(EmptyString(name))
  90                 return NULL;
  91
  92         hashv = hash_opername(name);
  93
  94         RB_DLINK_FOREACH(ptr, operhash_table[hashv].head)
  95         {
  96                 ohash_copy = ptr->data;
  97
  98                 if(!irccmp(ohash_copy, name))
  99                         return ohash_copy;
 100         }
 101
 102         return NULL;
 103 }
 104
 105 void
 106 operhash_delete(const char *name)
 107 {
 108         char *ohash_copy;
 109         void *ohash_mem;
 110         unsigned int hashv;
 111         rb_dlink_node *ptr;
 112
 113         if(EmptyString(name))
 114                 return;
 115
 116         hashv = hash_opername(name);
 117
 118         RB_DLINK_FOREACH(ptr, operhash_table[hashv].head)
 119         {
 120                 ohash_copy = ptr->data;
 121
 122                 if(irccmp(ohash_copy, name))
 123                         continue;
 124
 125                 ohash_mem = ohash_copy - 5;
 126                 (*(int32_t *) ohash_mem)--;
 127
 128                 if((*(int32_t *) ohash_mem) == 0)
 129                 {
 130                         rb_dlinkDestroy(ptr, &operhash_table[hashv]);
 131                         rb_free(ohash_mem);
 132                         return;
 133                 }
 134         }
 135 }