common: add generic input-line interface, and an implementation of it for text files

common/status.c

@@ -0,0 +1,19 @@
+#include <ivy/status.h>
+
+#define ENUM_STR(x)                                                            \
+	case x:                                                                \
+		return #x
+
+const char *ivy_status_to_string(enum ivy_status status)
+{
+	switch (status) {
+		ENUM_STR(IVY_OK);
+		ENUM_STR(IVY_ERR_EOF);
+		ENUM_STR(IVY_ERR_IO_FAILURE);
+		ENUM_STR(IVY_ERR_BAD_SYNTAX);
+		ENUM_STR(IVY_ERR_NO_MEMORY);
+		ENUM_STR(IVY_ERR_NOT_SUPPORTED);
+	default:
+		return "";
+	}
+}