do not use fixed sized buffer in mrb_bug/mrb_warn; close #287

include/mruby.h

@@ -428,7 +428,6 @@ int mrb_block_given_p(void);
 void mrb_raise(mrb_state *mrb, struct RClass *c, const char *fmt, ...);
 void rb_raise(struct RClass *c, const char *fmt, ...);
 void mrb_warn(const char *fmt, ...);
-void mrb_warning(const char *fmt, ...);
 void mrb_bug(const char *fmt, ...);
 
 #define E_TYPE_ERROR                (mrb_class_obj_get(mrb, "TypeError"))

src/error.c

@@ -229,25 +229,23 @@ void
 mrb_warn(const char *fmt, ...)
 {
   va_list args;
-  char buf[256];
 
   va_start(args, fmt);
-  snprintf(buf, 256, "warning: %s", fmt);
-  printf(buf, args);
+  printf("warning: ");
+  vprintf(fmt, args);
   va_end(args);
 }
 
-
 void
 mrb_bug(const char *fmt, ...)
 {
   va_list args;
-  char buf[256];
 
   va_start(args, fmt);
-  snprintf(buf, 256, "bug: %s", fmt);
-  printf(buf, args);
+  printf("bug: ");
+  vprintf(fmt, args);
   va_end(args);
+  exit(EXIT_FAILURE);
 }
 
 static const char *