![Guy Harris](/assets/img/avatar_default.png)
to "gpointer", so that we only get warnings when we turn on the extra GCC warning checks. svn path=/trunk/; revision=6734
206 lines
6.5 KiB
C
206 lines
6.5 KiB
C
/* conditions.c
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* Implementation for condition handler.
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*
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* $Id: conditions.c,v 1.5 2002/12/03 02:07:07 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include "conditions.h"
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/* container for condition classes */
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static GHashTable* classes = NULL;
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/* condition data structure declaration */
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struct condition{
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char* class_id;
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void* user_data;
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_cnd_eval eval_func;
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_cnd_reset reset_func;
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};
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/* structure used to store class functions in GHashTable */
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typedef struct _cnd_class{
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_cnd_constr constr_func;
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_cnd_destr destr_func;
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_cnd_eval eval_func;
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_cnd_reset reset_func;
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} _cnd_class;
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/* helper function prototypes */
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static void _cnd_init();
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static void _cnd_find_hash_key_for_class_id(gpointer, gpointer, gpointer);
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condition* cnd_new(const char* class_id, ...){
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va_list ap;
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condition *cnd = NULL, *cnd_ref = NULL;
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_cnd_class *cls = NULL;
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char* id = NULL;
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/* check if hash table is already initialized */
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_cnd_init();
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/* get class structure for this id */
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if((cls = (_cnd_class*)g_hash_table_lookup(classes, class_id)) == NULL)
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return NULL;
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/* initialize the basic structure */
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if((cnd_ref = (condition*)malloc(sizeof(condition))) == NULL) return NULL;
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cnd_ref->user_data = NULL;
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cnd_ref->eval_func = cls->eval_func;
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cnd_ref->reset_func = cls->reset_func;
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/* copy the class id */
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if((id = (char*)malloc(strlen(class_id)+1)) == NULL){
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free(cnd_ref);
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return NULL;
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}
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strcpy(id, class_id);
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cnd_ref->class_id = id;
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/* perform class specific initialization */
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va_start(ap, class_id);
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cnd = (cls->constr_func)(cnd_ref, ap);
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va_end(ap);
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/* check for successful construction */
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if(cnd == NULL){
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free(cnd_ref);
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free(id);
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}
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return cnd;
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} /* END cnd_new() */
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void cnd_delete(condition *cnd){
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_cnd_class *cls = NULL;
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const char* class_id = cnd->class_id;
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/* check for valid pointer */
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if(cnd == NULL) return;
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/* check if hash table is already initialized */
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_cnd_init();
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/* get the condition class */
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cls = (_cnd_class*)g_hash_table_lookup(classes, class_id);
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/* call class specific destructor */
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if(cls != NULL) (cls->destr_func)(cnd);
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/* free memory */
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free(cnd->class_id);
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/* free basic structure */
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free(cnd);
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} /* END cnd_delete() */
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gboolean cnd_eval(condition *cnd, ...){
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va_list ap;
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gboolean ret_val = FALSE;
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/* validate cnd */
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if(cnd == NULL) return FALSE;
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/* call specific handler */
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va_start(ap, cnd);
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ret_val = (cnd->eval_func)(cnd, ap);
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va_end(ap);
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return ret_val;
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} /* END cnd_eval() */
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void cnd_reset(condition *cnd){
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if(cnd != NULL) (cnd->reset_func)(cnd);
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} /* END cnd_reset() */
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void* cnd_get_user_data(condition *cnd){
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return cnd->user_data;
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} /* END cnd_get_user_data() */
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void cnd_set_user_data(condition *cnd, void* user_data){
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cnd->user_data = user_data;
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} /* END cnd_set_user_data() */
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gboolean cnd_register_class(const char* class_id,
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_cnd_constr constr_func,
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_cnd_destr destr_func,
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_cnd_eval eval_func,
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_cnd_reset reset_func){
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char* key = NULL;
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_cnd_class *cls = NULL;
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/* check for valid parameters */
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if((constr_func == NULL) || (destr_func == NULL) ||
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(eval_func == NULL) || (reset_func == NULL) || (class_id == NULL))
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return FALSE;
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/* check if hash table is already initialized */
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_cnd_init();
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/* check for unique class id */
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if((cls = (_cnd_class*)g_hash_table_lookup(classes, class_id)) != NULL)
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return FALSE;
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/* GHashTable keys need to be persistent for the lifetime of the hash
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table. Allocate memory and copy the class id which we use as key. */
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if((key = (char*)malloc(strlen(class_id)+1)) == NULL) return FALSE;
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strcpy(key, class_id);
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/* initialize class structure */
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if((cls = (_cnd_class*)malloc(sizeof(_cnd_class))) == NULL){
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free(key);
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return FALSE;
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}
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cls->constr_func = constr_func;
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cls->destr_func = destr_func;
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cls->eval_func = eval_func;
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cls->reset_func = reset_func;
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/* insert new class */
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g_hash_table_insert(classes, key, cls);
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return TRUE;
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} /* END cnd_register_class() */
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static char* pkey = NULL;
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void cnd_unregister_class(const char* class_id){
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const char *key = (const char*)class_id;
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_cnd_class *cls = NULL;
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/* check if hash table is already initialized */
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_cnd_init();
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/* find the key for this class id and store it in 'pkey' */
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g_hash_table_foreach(classes,
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_cnd_find_hash_key_for_class_id,
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(gpointer)key);
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/* find the class structure for this class id */
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cls = (_cnd_class*)g_hash_table_lookup(classes, class_id);
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/* remove constructor from hash table */
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g_hash_table_remove(classes, class_id);
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/* free the key */
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free(pkey);
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pkey = NULL;
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/* free the value */
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free(cls);
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} /* END cnd_unregister_class() */
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/*
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* Initialize hash table.
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*/
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static void _cnd_init(){
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if(classes != NULL) return;
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/* create hash table, we use strings as keys */
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classes = g_hash_table_new(g_str_hash, g_str_equal);
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} /* END _cnd_init() */
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/*
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* Callback for function 'g_hash_table_foreach()'.
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* We don't keep references to hash table keys. Keys have memory allocated
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* which must be freed when they are not used anymore. This function finds
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* the reference to a key corresponding to a particular class id. The reference
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* to the key is stored in a global variable.
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*/
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void _cnd_find_hash_key_for_class_id(gpointer key,
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gpointer value _U_,
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gpointer user_data){
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char* class_id = (char*)user_data;
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char* key_value = (char*)key;
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if(strcmp(class_id, key_value) == 0) pkey = key;
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} /* END _cnd_find_hash_key_for_class_id() */
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