examples/mrbgems: clarify the caller

Before this commit:

  mruby -e 'CRubyExtension.ruby_method' # => A Ruby Extension
  mruby -e 'CRubyExtension.c_method'    # => A C Extension
  mruby -e 'CExtension.c_method'        # => A C Extension
  mruby -e 'RubyExtension.ruby_method'  # => A Ruby Extension

After this commit:

  mruby -e 'CRubyExtension.ruby_method' # => CRubyExtension: A Ruby Extension
  mruby -e 'CRubyExtension.c_method'    # => CRubyExtension: A C Extension
  mruby -e 'CExtension.c_method'        # => CExtension: A C Extension
  mruby -e 'RubyExtension.ruby_method'  # => RubyExtension: A Ruby Extension

1 files changed, 5 insertions, 1 deletions

diff --git a/examples/mrbgems/c_extension_example/src/example.c b/examples/mrbgems/c_extension_example/src/example.c
index e70ee42f8..727c7c698 100644
--- a/examples/mrbgems/c_extension_example/src/example.c
+++ b/examples/mrbgems/c_extension_example/src/example.c
@@ -1,10 +1,14 @@
 #include <mruby.h>
+#include <mruby/string.h>
 #include <stdio.h>
 
 static mrb_value
 mrb_c_method(mrb_state *mrb, mrb_value self)
 {
-  puts("A C Extension");
+  mrb_value self_str = mrb_str_to_str(mrb, self);
+
+  printf("%s: A C Extension\n", mrb_str_to_cstr(mrb, self_str));
+
   return self;
 }