mruby: implement dummy KernAux.snprintf1

pkgs/mruby/mrblib/kernaux.rb

@@ -23,10 +23,6 @@ module KernAux
     snprintf1(SPRINTF1_BUFFER_SIZE, format, *args).first
   end
 
-  def self.snprintf1(_buffer_size, _format, ...)
-    ['', 0]
-  end
-
   class Error < RuntimeError; end
   class AssertError < Error; end
 end

pkgs/mruby/src/main.c

@@ -27,6 +27,7 @@ void mrb_mruby_kernaux_gem_init(mrb_state *const mrb)
     init_assert(mrb);
     init_ntoa(mrb);
     init_cmdline(mrb);
+    init_printf(mrb);
 }
 
 void current_mrb_start(mrb_state *mrb)

pkgs/mruby/src/main.h

@@ -10,5 +10,6 @@ mrb_state *current_mrb_get();
 void init_assert(mrb_state *mrb);
 void init_ntoa(mrb_state *mrb);
 void init_cmdline(mrb_state *mrb);
+void init_printf(mrb_state *mrb);
 
 #endif

pkgs/mruby/src/printf.c

@@ -0,0 +1,25 @@
+#include "main.h"
+
+#include <kernaux.h>
+
+#include <mruby.h>
+#include <mruby/array.h>
+#include <mruby/presym.h>
+
+static mrb_value rb_KernAux_snprintf1(mrb_state *mrb, mrb_value self);
+
+void init_printf(mrb_state *const mrb)
+{
+    struct RClass *const rb_KernAux = mrb_module_get_id(mrb, MRB_SYM(KernAux));
+
+    mrb_define_class_method(mrb, rb_KernAux, "snprintf1", rb_KernAux_snprintf1,
+                            MRB_ARGS_REQ(2) | MRB_ARGS_OPT(2));
+}
+
+mrb_value rb_KernAux_snprintf1(mrb_state *const mrb, mrb_value self)
+{
+    mrb_value values[2];
+    values[0] = mrb_obj_freeze(mrb, mrb_str_new_lit(mrb, ""));
+    values[1] = mrb_nil_value();
+    return mrb_obj_freeze(mrb, mrb_ary_new_from_values(mrb, 2, values));
+}