4 files changed, 115 insertions, 0 deletions
diff --git a/build_config.rb b/build_config.rb
index c3f529656..951f4b7a3 100644
--- a/build_config.rb
+++ b/build_config.rb
@@ -11,6 +11,9 @@ MRuby::Build.new do |conf|
   # conf.gem :github => 'masuidrive/mrbgems-example', :branch => 'master'
   # conf.gem :git => '[email protected]:masuidrive/mrbgems-example.git', :branch => 'master', :options => '-v'
 
+  # Use standard print/puts/p
+  conf.gem "#{root}/mrbgems/mruby-print"
+
   # Use standard Math module
   conf.gem "#{root}/mrbgems/mruby-math"
 
diff --git a/mrbgems/mruby-print/mrbgem.rake b/mrbgems/mruby-print/mrbgem.rake
new file mode 100644
index 000000000..dc7831280
--- /dev/null
+++ b/mrbgems/mruby-print/mrbgem.rake
@@ -0,0 +1,4 @@
+MRuby::Gem::Specification.new('mruby-print') do |spec|
+  spec.license = 'MIT'
+  spec.authors = 'mruby developers'
+end
diff --git a/mrbgems/mruby-print/mrblib/print.rb b/mrbgems/mruby-print/mrblib/print.rb
new file mode 100644
index 000000000..38a10661b
--- /dev/null
+++ b/mrbgems/mruby-print/mrblib/print.rb
@@ -0,0 +1,64 @@
+##
+# Kernel
+#
+# ISO 15.3.1
+module Kernel
+  ##
+  # Invoke method +print+ on STDOUT and passing +*args+
+  #
+  # ISO 15.3.1.2.10
+  def print(*args)
+    i = 0
+    len = args.size
+    while i < len
+      __printstr__ args[i].to_s
+      i += 1
+    end
+  end
+
+  ##
+  # Invoke method +puts+ on STDOUT and passing +*args*+
+  #
+  # ISO 15.3.1.2.11
+  def puts(*args)
+    i = 0
+    len = args.size
+    while i < len
+      s = args[i].to_s
+      __printstr__ s
+      __printstr__ "\n" if (s[-1] != "\n")
+      i += 1
+    end
+    __printstr__ "\n" if len == 0
+    nil
+  end
+
+  ##
+  # Print human readable object description
+  #
+  # ISO 15.3.1.3.34
+  def p(*args)
+    i = 0
+    len = args.size
+    while i < len
+      __printstr__ args[i].inspect
+      __printstr__ "\n"
+      i += 1
+    end
+    args[0]
+  end
+
+  unless Kernel.respond_to?(:sprintf)
+    def printf(*args)
+      raise NotImplementedError.new('printf not available')
+    end
+    def sprintf(*args)
+      raise NotImplementedError.new('sprintf not available')
+    end
+  else
+    def printf(*args)
+      __printstr__(sprintf(*args))
+      nil
+    end
+  end
+end
diff --git a/mrbgems/mruby-print/src/print.c b/mrbgems/mruby-print/src/print.c
new file mode 100644
index 000000000..608e3cc2d
--- /dev/null
+++ b/mrbgems/mruby-print/src/print.c
@@ -0,0 +1,44 @@
+#include "mruby.h"
+#include "mruby/string.h"
+#include <stdio.h>
+
+static void
+printstr(mrb_state *mrb, mrb_value obj)
+{
+  struct RString *str;
+  char *s;
+  int len;
+
+  if (mrb_string_p(obj)) {
+    str = mrb_str_ptr(obj);
+    s = str->ptr;
+    len = str->len;
+    fwrite(s, len, 1, stdout);
+  }
+}
+
+/* 15.3.1.2.9  */
+/* 15.3.1.3.34 */
+mrb_value
+mrb_printstr(mrb_state *mrb, mrb_value self)
+{
+  mrb_value argv;
+
+  mrb_get_args(mrb, "o", &argv);
+  printstr(mrb, argv);
+
+  return argv;
+}
+
+void
+mrb_mruby_print_gem_init(mrb_state* mrb)
+{
+  struct RClass *krn;
+  krn = mrb->kernel_module;
+  mrb_define_method(mrb, krn, "__printstr__", mrb_printstr, ARGS_REQ(1));
+}
+
+void
+mrb_mruby_print_gem_final(mrb_state* mrb)
+{
+}