1 files changed, 4 insertions, 5 deletions
diff --git a/include/program.h b/include/program.h
index aa318d9..dc65cb7 100644
--- a/include/program.h
+++ b/include/program.h
@@ -38,13 +38,11 @@
 #define AMAL_PROGRAM_INVALID_IMPORTS -26
 #define AMAL_PROGRAM_SECTION_ERROR -27
 
-#define AMAL_PROGRAM_ARGS_SIZE_VARARGS -1
-
 #define AMAL_PROGRAM_MAX_RETURN_VALUES 128
 
 typedef struct {
     void *func;
-    int args_byte_size; /* -1 if varargs (AMAL_PROGRAM_ARGS_SIZE_VARARGS) */
+    u32 args_byte_size;
 } ProgramExternFunc;
 
 typedef struct {
@@ -81,9 +79,10 @@ void amal_program_deinit(amal_program *self);
 
 /*
     returns @AMAL_PROGRAM_EXTERN_FUNC_ALREADY_EXISTS if a function with the name @name already exists
-    in the program
+    in the program.
+    If the function has a vararg parameter, then @args_byte_size should be the minimum parameters size excluding the varargs.
 */
-CHECK_RESULT int amal_program_register_extern_func(amal_program *self, BufferView name, void *func_ptr, int args_byte_size);
+CHECK_RESULT int amal_program_register_extern_func(amal_program *self, BufferView name, void *func_ptr, u32 args_byte_size);
 
 CHECK_RESULT int amal_program_append_bytecode(amal_program *self, Bytecode *bytecode);
 CHECK_RESULT int amal_program_run(amal_program *self);