Added introspection capabilities.

src/excit.c

 #include <stdlib.h>
 #include <excit.h>
 
+#define CASE(val) case val: return #val; break;
+
+const char * excit_type_name(enum excit_type_e type)
+{
+	switch(type) {
+		CASE(EXCIT_RANGE)
+		CASE(EXCIT_CONS)
+		CASE(EXCIT_REPEAT)
+		CASE(EXCIT_HILBERT2D)
+		CASE(EXCIT_PRODUCT)
+		CASE(EXCIT_SLICE)
+		CASE(EXCIT_USER)
+		CASE(EXCIT_TYPE_MAX)
+	default:
+		return NULL;
+	}
+}
+
+const char * excit_error_name(enum excit_error_e err)
+{
+	switch(err) {
+		CASE(EXCIT_SUCCESS)
+		CASE(EXCIT_STOPIT)
+		CASE(EXCIT_ENOMEM)
+		CASE(EXCIT_EINVAL)
+		CASE(EXCIT_EDOM)
+		CASE(EXCIT_ENOTSUP)
+		CASE(EXCIT_ERROR_MAX)
+	default:
+		return NULL;
+	}
+}
+
+#undef CASE
+
 /*--------------------------------------------------------------------*/
 
 struct slice_it_s {

src/excit.h

@@ -12,6 +12,8 @@ enum excit_type_e {
 	EXCIT_TYPE_MAX
 };
 
+const char * excit_type_name(enum excit_type_e type);
+
 enum excit_error_e {
 	EXCIT_SUCCESS,
 	EXCIT_STOPIT,
@@ -22,6 +24,8 @@ enum excit_error_e {
 	EXCIT_ERROR_MAX
 };
 
+const char * excit_error_name(enum excit_error_e err);
+
 struct excit_s {
 	const struct excit_func_table_s *functions;
 	ssize_t dimension;