First commit

MLV/key.c

@@ -0,0 +1,97 @@
+/*
+ *   This file is part of the MLV Library.
+ *
+ *   Copyright (C) 2012 Adrien Boussicault, Marc Zipstein
+ *
+ *
+ *    This Library is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This Library is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this Library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "key.h"
+
+#include "warning_error.h"
+#include "memory_management.h"
+#include <string.h>
+
+struct _MLV_Key {
+	void* value;
+	void (* value_destroying_function )( void* value );
+	int (* compare_values )( void* value1, void* value2 );
+};
+
+MLV_Key* MLV_create_key(
+	void* value,
+	void (* value_destroying_function )( void* data ),
+	int (* compare_values )( void* value1, void* value2 )
+){
+	MLV_Key* key = MLV_MALLOC( 1, MLV_Key );
+	key->value = value;
+	key->value_destroying_function = value_destroying_function;
+	key->compare_values = compare_values;
+	return key;
+}
+
+void MLV_free_key( MLV_Key* key ){
+	if( key ){
+		if( key->value_destroying_function ){
+			key->value_destroying_function( key->value );
+		}
+		MLV_FREE( key, MLV_Key );
+	}
+}
+
+int MLV_compare_keys( MLV_Key* key1, MLV_Key* key2 ){
+	return key1->compare_values( key1->value, key2->value );
+}
+
+void free_string( char* text ){
+	MLV_FREE( text, char );
+}
+
+int compare_strings( char* text1, char* text2 ){
+	return strcmp( text1, text2 );
+}
+
+MLV_Key* MLV_string_to_key( const char* text ){
+    size_t l = strlen( text );
+    char* text_copy = MLV_MALLOC( ( l + 1 ), char );
+    strncpy( text_copy, text, l+1);
+	return MLV_create_key(
+		text_copy, 
+		( void (*)( void* ) ) free_string,
+		( int (*)( void*, void* ) ) compare_strings
+	);
+}
+
+void free_integer( int* integer ){
+	MLV_FREE( integer, int );
+}
+
+int compare_integers( int* int1, int* int2 ){
+	return (*int1) - (*int2);
+}
+
+MLV_Key* MLV_integer_to_key( int integer ){
+	int* value = MLV_MALLOC( 1, int );
+	*value = integer;
+	return MLV_create_key(
+		value, 
+		( void (*)( void* ) ) free_integer,
+		(int (*)( void*, void* )) compare_integers
+	);
+}
+
+void* MLV_get_value_from_key( MLV_Key* key ){
+	return key->value;
+}