added ftdm_variables.c

libs/freetdm/src/ftdm_variables.c

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2010, Sangoma Technologies
+ * David Yat Sin <dyatsin@sangoma.com>
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 
+ * * Neither the name of the original author; nor the names of any contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Contributors: 
+ *
+ * Moises Silva <moy@sangoma.com>
+ *
+ */
+
+#include "private/ftdm_core.h"
+
+FT_DECLARE(ftdm_status_t) ftdm_event_add_var(ftdm_sigmsg_t *sigmsg, const char *var_name, const char *value)
+{
+	char *t_name = 0, *t_val = 0;
+
+	if (!sigmsg || !var_name || !value) {
+		return FTDM_FAIL;
+	}
+	
+	if (!sigmsg->variables) {
+		/* initialize on first use */
+		sigmsg->variables = create_hashtable(16, ftdm_hash_hashfromstring, ftdm_hash_equalkeys);
+		ftdm_assert_return(sigmsg->variables, FTDM_FAIL, "Failed to create hash table\n");
+	}
+	
+	t_name = ftdm_strdup(var_name);
+	t_val = ftdm_strdup(value);
+	hashtable_insert(sigmsg->variables, t_name, t_val, HASHTABLE_FLAG_FREE_KEY | HASHTABLE_FLAG_FREE_VALUE);
+	return FTDM_SUCCESS;
+}
+
+FT_DECLARE(ftdm_status_t) ftdm_event_remove_var(ftdm_sigmsg_t *sigmsg, const char *var_name)
+{
+	if (sigmsg && sigmsg->variables) {
+		hashtable_remove(sigmsg->variables, (void *)var_name);
+	}
+	return FTDM_SUCCESS;
+}
+
+FT_DECLARE(const char *) ftdm_event_get_var(ftdm_sigmsg_t *sigmsg, const char *var_name)
+{
+	const char *var = NULL;
+	
+	if (!sigmsg || !sigmsg->variables || !var_name) {
+		return NULL;
+	}
+
+	var = (const char *)hashtable_search(((struct hashtable*)sigmsg->variables), (void *)var_name);
+	return var;
+}
+
+FT_DECLARE(ftdm_iterator_t *) ftdm_event_get_var_iterator(const ftdm_sigmsg_t *sigmsg, ftdm_iterator_t *iter)
+{
+	ftdm_hash_iterator_t *hashiter = NULL;
+	if (!sigmsg) {
+		return NULL;
+	}
+	
+	hashiter = sigmsg->variables == NULL ? NULL : hashtable_first(sigmsg->variables);
+	
+	if (hashiter == NULL) {
+		return NULL;
+	}
+	
+	if (!(iter = get_iterator(FTDM_ITERATOR_VARS, iter))) {
+		return NULL;
+	}
+	iter->pvt.hashiter = hashiter;
+	return iter;
+}
+
+FT_DECLARE(ftdm_status_t) ftdm_event_get_current_var(ftdm_iterator_t *iter, const char **var_name, const char **var_val)
+{
+	const void *key = NULL;
+	void *val = NULL;
+
+	*var_name = NULL;
+	*var_val = NULL;
+
+	ftdm_assert_return(iter && (iter->type == FTDM_ITERATOR_VARS) && iter->pvt.hashiter, FTDM_FAIL, "Cannot get variable from invalid iterator!\n");
+
+	hashtable_this(iter->pvt.hashiter, &key, NULL, &val);
+
+	*var_name = key;
+	*var_val = val;
+
+	return FTDM_SUCCESS;
+}
+
+FT_DECLARE(ftdm_status_t) ftdm_event_clear_vars(ftdm_sigmsg_t *sigmsg)
+{
+	if (sigmsg->variables) {
+		hashtable_destroy(sigmsg->variables);
+		sigmsg->variables = NULL;
+	}
+	return FTDM_SUCCESS;
+}