1 files changed, 119 insertions, 0 deletions
diff --git a/intern.c b/intern.c
new file mode 100644
index 00000000..2c7d2eff
--- /dev/null
+++ b/intern.c
@@ -0,0 +1,119 @@
+/** \file intern.c
+
+    Library for pooling common strings
+
+*/
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <wchar.h>
+
+#include "util.h"
+#include "common.h"
+#include "intern.h"
+
+hash_table_t *intern_table=0;
+hash_table_t *intern_static_table=0;
+
+static void intern_load_common_static()
+{
+	intern_static( L"" );
+}
+
+const wchar_t *intern( const wchar_t *in )
+{
+	const wchar_t *res=0;
+	
+	if( !in )
+		return 0;
+	
+	intern_load_common_static();
+	
+
+	if( !intern_table )
+	{
+		intern_table = malloc( sizeof( hash_table_t ) );
+		if( !intern_table )
+		{
+			die_mem();
+		}
+		hash_init( intern_table, &hash_wcs_func, &hash_wcs_cmp );
+	}
+	
+	if( intern_static_table )
+	{
+		res = hash_get( intern_static_table, in );
+	}
+	
+	if( !res )
+	{
+		res = hash_get( intern_table, in );
+		
+		if( !res )
+		{
+			res = wcsdup( in );
+			if( !res )
+			{
+				die_mem();
+			}
+			
+			hash_put( intern_table, res, res );
+		}
+	}
+	
+	return res;
+}
+
+const wchar_t *intern_static( const wchar_t *in )
+{
+	const wchar_t *res=0;
+	
+	if( !in )
+		return 0;
+	
+	if( !intern_static_table )
+	{
+		intern_static_table = malloc( sizeof( hash_table_t ) );
+		if( !intern_static_table )
+		{
+			die_mem();			
+		}
+		hash_init( intern_static_table, &hash_wcs_func, &hash_wcs_cmp );
+	}
+	
+	res = hash_get( intern_static_table, in );
+	
+	if( !res )
+	{
+		res = in;
+		hash_put( intern_static_table, res, res );
+	}
+	
+	return res;
+}
+
+static void clear_value( const void *key, const void *data )
+{
+	debug( 3,  L"interned string: '%ls'", data );	
+	free( (void *)data );
+}
+
+void intern_free_all()
+{
+	if( intern_table )
+	{
+		hash_foreach( intern_table, &clear_value );		
+		hash_destroy( intern_table );		
+		free( intern_table );
+		intern_table=0;		
+	}
+
+	if( intern_static_table )
+	{
+		hash_destroy( intern_static_table );		
+		free( intern_static_table );
+		intern_static_table=0;		
+	}
+	
+}