usr.sbin/nscd/agent.c

   1 /*-
   2  * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/nscd/agent.c,v 1.3 2008/10/12 00:44:27 delphij Exp $
  27  */
  28
  29 #include <assert.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include "agent.h"
  33 #include "debug.h"
  34
  35 static int
  36 agent_cmp_func(const void *a1, const void *a2)
  37 {
  38         struct agent const *ap1 = *((struct agent const **)a1);
  39         struct agent const *ap2 = *((struct agent const **)a2);
  40         int res;
  41
  42         res = strcmp(ap1->name, ap2->name);
  43         if (res == 0) {
  44                 if (ap1->type == ap2->type)
  45                         res = 0;
  46                 else if (ap1->type < ap2->type)
  47                         res = -1;
  48                 else
  49                         res = 1;
  50         }
  51
  52         return (res);
  53 }
  54
  55 struct agent_table *
  56 init_agent_table(void)
  57 {
  58         struct agent_table      *retval;
  59
  60         TRACE_IN(init_agent_table);
  61         retval = (struct agent_table *)calloc(1, sizeof(struct agent_table));
  62         assert(retval != NULL);
  63
  64         TRACE_OUT(init_agent_table);
  65         return (retval);
  66 }
  67
  68 void
  69 register_agent(struct agent_table *at, struct agent *a)
  70 {
  71         struct agent **new_agents;
  72         size_t new_agents_num;
  73
  74         TRACE_IN(register_agent);
  75         assert(at != NULL);
  76         assert(a != NULL);
  77         new_agents_num = at->agents_num + 1;
  78         new_agents = (struct agent **)malloc(sizeof(struct agent *) *
  79                 new_agents_num);
  80         assert(new_agents != NULL);
  81         memcpy(new_agents, at->agents, at->agents_num * sizeof(struct agent *));
  82         new_agents[new_agents_num - 1] = a;
  83         qsort(new_agents, new_agents_num, sizeof(struct agent *),
  84                 agent_cmp_func);
  85
  86         free(at->agents);
  87         at->agents = new_agents;
  88         at->agents_num = new_agents_num;
  89         TRACE_OUT(register_agent);
  90 }
  91
  92 struct agent *
  93 find_agent(struct agent_table *at, const char *name, enum agent_type type)
  94 {
  95         struct agent **res;
  96         struct agent model, *model_p;
  97
  98         TRACE_IN(find_agent);
  99         model.name = (char *)name;
 100         model.type = type;
 101         model_p = &model;
 102         res = bsearch(&model_p, at->agents, at->agents_num,
 103                 sizeof(struct agent *), agent_cmp_func);
 104
 105         TRACE_OUT(find_agent);
 106         return ( res == NULL ? NULL : *res);
 107 }
 108
 109 void
 110 destroy_agent_table(struct agent_table *at)
 111 {
 112         size_t i;
 113
 114         TRACE_IN(destroy_agent_table);
 115         assert(at != NULL);
 116         for (i = 0; i < at->agents_num; ++i) {
 117                 free(at->agents[i]->name);
 118                 free(at->agents[i]);
 119         }
 120
 121         free(at->agents);
 122         free(at);
 123         TRACE_OUT(destroy_agent_table);
 124 }