1 files changed, 154 insertions, 0 deletions
diff --git a/mrbgems/mruby-random/src/random.c b/mrbgems/mruby-random/src/random.c
new file mode 100644
index 000000000..599dcc381
--- /dev/null
+++ b/mrbgems/mruby-random/src/random.c
@@ -0,0 +1,154 @@
+/*
+** random.c - Random module
+**
+** See Copyright Notice in mruby.h
+*/
+
+#include "mruby.h"
+#include "mruby/variable.h"
+#include "mt19937ar.h"
+
+#include <time.h>
+
+#define GLOBAL_RAND_SEED_KEY    "$mrb_g_rand_seed"
+#define INSTANCE_RAND_SEED_KEY  "$mrb_i_rand_seed"
+ 
+static void mt_srand(unsigned long seed)
+{
+  init_genrand(seed);
+}  
+
+static unsigned long mt_rand()
+{
+  return genrand_int32();
+}  
+
+static double mt_rand_real()
+{
+  return genrand_real1();
+}  
+
+static mrb_value mrb_random_mt_srand(mrb_state *mrb, mrb_value seed)
+{ 
+  if (mrb_nil_p(seed)) {
+    seed = mrb_fixnum_value(time(NULL) + mt_rand());
+    if (mrb_fixnum(seed) < 0) {
+      seed = mrb_fixnum_value( 0 - mrb_fixnum(seed));
+    }
+  }
+
+  mt_srand((unsigned) mrb_fixnum(seed));
+
+  return seed;
+}
+
+static mrb_value mrb_random_mt_rand(mrb_state *mrb, mrb_value max)
+{ 
+  mrb_value value;
+
+  if (mrb_fixnum(max) == 0) {
+    value = mrb_float_value(mt_rand_real());
+  } else {
+    value = mrb_fixnum_value(mt_rand() % mrb_fixnum(max));
+  }
+
+  return value;
+}
+
+static mrb_value get_opt(mrb_state* mrb)
+{
+  mrb_value arg;
+
+  arg = mrb_fixnum_value(0);
+  mrb_get_args(mrb, "|o", &arg);
+
+  if (!mrb_nil_p(arg)) {
+    if (!mrb_fixnum_p(arg)) {
+      mrb_raise(mrb, E_ARGUMENT_ERROR, "invalid argument type");
+    }
+    arg = mrb_check_convert_type(mrb, arg, MRB_TT_FIXNUM, "Fixnum", "to_int");
+    if (mrb_fixnum(arg) < 0) {
+      arg = mrb_fixnum_value(0 - mrb_fixnum(arg));
+    }
+  }
+  return arg;
+}
+
+static mrb_value mrb_random_g_rand(mrb_state *mrb, mrb_value self)
+{
+  mrb_value max;
+  mrb_value seed;
+
+  max = get_opt(mrb);
+  seed = mrb_gv_get(mrb, mrb_intern(mrb, GLOBAL_RAND_SEED_KEY));
+  if (mrb_nil_p(seed)) {
+    mrb_random_mt_srand(mrb, mrb_nil_value());
+  }
+  return mrb_random_mt_rand(mrb, max);
+}
+
+static mrb_value mrb_random_g_srand(mrb_state *mrb, mrb_value self)
+{
+  mrb_value seed;
+  mrb_value old_seed;
+
+  seed = get_opt(mrb);
+  seed = mrb_random_mt_srand(mrb, seed);
+  old_seed = mrb_gv_get(mrb, mrb_intern(mrb, GLOBAL_RAND_SEED_KEY));
+  mrb_gv_set(mrb, mrb_intern(mrb, GLOBAL_RAND_SEED_KEY), seed);
+  return old_seed;
+}
+
+static mrb_value mrb_random_init(mrb_state *mrb, mrb_value self)
+{
+  mrb_value seed;
+
+  seed = get_opt(mrb);
+  seed = mrb_random_mt_srand(mrb, seed);
+  mrb_iv_set(mrb, self, mrb_intern(mrb, INSTANCE_RAND_SEED_KEY), seed);
+  return self;
+}
+
+static mrb_value mrb_random_rand(mrb_state *mrb, mrb_value self)
+{
+  mrb_value max;
+
+  max = get_opt(mrb);
+  mrb_value seed = mrb_iv_get(mrb, self, mrb_intern(mrb, INSTANCE_RAND_SEED_KEY));
+  if (mrb_nil_p(seed)) {
+    mrb_random_mt_srand(mrb, mrb_nil_value());
+  }
+  return mrb_random_mt_rand(mrb, max);
+}
+
+static mrb_value mrb_random_srand(mrb_state *mrb, mrb_value self)
+{
+  mrb_value seed;
+
+  seed = get_opt(mrb);
+  seed = mrb_random_mt_srand(mrb, seed);
+  mrb_value old_seed = mrb_iv_get(mrb, self, mrb_intern(mrb, INSTANCE_RAND_SEED_KEY));
+  mrb_iv_set(mrb, self, mrb_intern(mrb, INSTANCE_RAND_SEED_KEY), seed);
+  return old_seed;
+}
+
+void mrb_mruby_random_gem_init(mrb_state *mrb)
+{
+  struct RClass *random;
+
+  mrb_define_method(mrb, mrb->kernel_module, "rand", mrb_random_g_rand, ARGS_OPT(1));
+  mrb_define_method(mrb, mrb->kernel_module, "srand", mrb_random_g_srand, ARGS_OPT(1));
+
+  random = mrb_define_class(mrb, "Random", mrb->object_class);
+  mrb_define_class_method(mrb, random, "rand", mrb_random_g_rand, ARGS_OPT(1));
+  mrb_define_class_method(mrb, random, "srand", mrb_random_g_srand, ARGS_OPT(1));
+
+  mrb_define_method(mrb, random, "initialize", mrb_random_init, ARGS_OPT(1));
+  mrb_define_method(mrb, random, "rand", mrb_random_rand, ARGS_OPT(1));
+  mrb_define_method(mrb, random, "srand", mrb_random_srand, ARGS_OPT(1));
+}
+
+void mrb_mruby_random_gem_final(mrb_state *mrb)
+{
+}
+