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-rw-r--r--web/server/h2o/libh2o/deps/mruby/mrbgems/mruby-random/src/random.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/web/server/h2o/libh2o/deps/mruby/mrbgems/mruby-random/src/random.c b/web/server/h2o/libh2o/deps/mruby/mrbgems/mruby-random/src/random.c
new file mode 100644
index 00000000..b865244c
--- /dev/null
+++ b/web/server/h2o/libh2o/deps/mruby/mrbgems/mruby-random/src/random.c
@@ -0,0 +1,349 @@
+/*
+** random.c - Random module
+**
+** See Copyright Notice in mruby.h
+*/
+
+#include <mruby.h>
+#include <mruby/variable.h>
+#include <mruby/class.h>
+#include <mruby/data.h>
+#include <mruby/array.h>
+#include "mt19937ar.h"
+
+#include <time.h>
+
+static char const MT_STATE_KEY[] = "$mrb_i_mt_state";
+
+static const struct mrb_data_type mt_state_type = {
+ MT_STATE_KEY, mrb_free,
+};
+
+static mrb_value mrb_random_rand(mrb_state *mrb, mrb_value self);
+static mrb_value mrb_random_srand(mrb_state *mrb, mrb_value self);
+
+static void
+mt_srand(mt_state *t, unsigned long seed)
+{
+ mrb_random_init_genrand(t, seed);
+}
+
+static unsigned long
+mt_rand(mt_state *t)
+{
+ return mrb_random_genrand_int32(t);
+}
+
+static double
+mt_rand_real(mt_state *t)
+{
+ return mrb_random_genrand_real1(t);
+}
+
+static mrb_value
+mrb_random_mt_srand(mrb_state *mrb, mt_state *t, mrb_value seed)
+{
+ if (mrb_nil_p(seed)) {
+ seed = mrb_fixnum_value((mrb_int)(time(NULL) + mt_rand(t)));
+ if (mrb_fixnum(seed) < 0) {
+ seed = mrb_fixnum_value(0 - mrb_fixnum(seed));
+ }
+ }
+
+ mt_srand(t, (unsigned) mrb_fixnum(seed));
+
+ return seed;
+}
+
+static mrb_value
+mrb_random_mt_rand(mrb_state *mrb, mt_state *t, mrb_value max)
+{
+ mrb_value value;
+
+ if (mrb_fixnum(max) == 0) {
+ value = mrb_float_value(mrb, mt_rand_real(t));
+ }
+ else {
+ value = mrb_fixnum_value(mt_rand(t) % mrb_fixnum(max));
+ }
+
+ return value;
+}
+
+static mrb_value
+get_opt(mrb_state* mrb)
+{
+ mrb_value arg;
+
+ arg = mrb_nil_value();
+ mrb_get_args(mrb, "|o", &arg);
+
+ if (!mrb_nil_p(arg)) {
+ arg = mrb_check_convert_type(mrb, arg, MRB_TT_FIXNUM, "Fixnum", "to_int");
+ if (mrb_nil_p(arg)) {
+ mrb_raise(mrb, E_ARGUMENT_ERROR, "invalid argument type");
+ }
+ if (mrb_fixnum(arg) < 0) {
+ arg = mrb_fixnum_value(0 - mrb_fixnum(arg));
+ }
+ }
+ return arg;
+}
+
+static mrb_value
+get_random(mrb_state *mrb) {
+ return mrb_const_get(mrb,
+ mrb_obj_value(mrb_class_get(mrb, "Random")),
+ mrb_intern_lit(mrb, "DEFAULT"));
+}
+
+static mt_state *
+get_random_state(mrb_state *mrb)
+{
+ mrb_value random_val = get_random(mrb);
+ return DATA_GET_PTR(mrb, random_val, &mt_state_type, mt_state);
+}
+
+static mrb_value
+mrb_random_g_rand(mrb_state *mrb, mrb_value self)
+{
+ mrb_value random = get_random(mrb);
+ return mrb_random_rand(mrb, random);
+}
+
+static mrb_value
+mrb_random_g_srand(mrb_state *mrb, mrb_value self)
+{
+ mrb_value random = get_random(mrb);
+ return mrb_random_srand(mrb, random);
+}
+
+static mrb_value
+mrb_random_init(mrb_state *mrb, mrb_value self)
+{
+ mrb_value seed;
+ mt_state *t;
+
+ seed = get_opt(mrb);
+
+ /* avoid memory leaks */
+ t = (mt_state*)DATA_PTR(self);
+ if (t) {
+ mrb_free(mrb, t);
+ }
+ mrb_data_init(self, NULL, &mt_state_type);
+
+ t = (mt_state *)mrb_malloc(mrb, sizeof(mt_state));
+ t->mti = N + 1;
+
+ seed = mrb_random_mt_srand(mrb, t, seed);
+ if (mrb_nil_p(seed)) {
+ t->has_seed = FALSE;
+ }
+ else {
+ mrb_assert(mrb_fixnum_p(seed));
+ t->has_seed = TRUE;
+ t->seed = mrb_fixnum(seed);
+ }
+
+ mrb_data_init(self, t, &mt_state_type);
+
+ return self;
+}
+
+static void
+mrb_random_rand_seed(mrb_state *mrb, mt_state *t)
+{
+ if (!t->has_seed) {
+ mrb_random_mt_srand(mrb, t, mrb_nil_value());
+ }
+}
+
+static mrb_value
+mrb_random_rand(mrb_state *mrb, mrb_value self)
+{
+ mrb_value max;
+ mt_state *t = DATA_GET_PTR(mrb, self, &mt_state_type, mt_state);
+
+ max = get_opt(mrb);
+ mrb_random_rand_seed(mrb, t);
+ return mrb_random_mt_rand(mrb, t, max);
+}
+
+static mrb_value
+mrb_random_srand(mrb_state *mrb, mrb_value self)
+{
+ mrb_value seed;
+ mrb_value old_seed;
+ mt_state *t = DATA_GET_PTR(mrb, self, &mt_state_type, mt_state);
+
+ seed = get_opt(mrb);
+ seed = mrb_random_mt_srand(mrb, t, seed);
+ old_seed = t->has_seed? mrb_fixnum_value(t->seed) : mrb_nil_value();
+ if (mrb_nil_p(seed)) {
+ t->has_seed = FALSE;
+ }
+ else {
+ mrb_assert(mrb_fixnum_p(seed));
+ t->has_seed = TRUE;
+ t->seed = mrb_fixnum(seed);
+ }
+
+ return old_seed;
+}
+
+/*
+ * call-seq:
+ * ary.shuffle! -> ary
+ *
+ * Shuffles elements in self in place.
+ */
+
+static mrb_value
+mrb_ary_shuffle_bang(mrb_state *mrb, mrb_value ary)
+{
+ mrb_int i;
+ mt_state *random = NULL;
+
+ if (RARRAY_LEN(ary) > 1) {
+ mrb_get_args(mrb, "|d", &random, &mt_state_type);
+
+ if (random == NULL) {
+ random = get_random_state(mrb);
+ }
+ mrb_random_rand_seed(mrb, random);
+
+ mrb_ary_modify(mrb, mrb_ary_ptr(ary));
+
+ for (i = RARRAY_LEN(ary) - 1; i > 0; i--) {
+ mrb_int j;
+ mrb_value *ptr = RARRAY_PTR(ary);
+ mrb_value tmp;
+
+
+ j = mrb_fixnum(mrb_random_mt_rand(mrb, random, mrb_fixnum_value(RARRAY_LEN(ary))));
+
+ tmp = ptr[i];
+ ptr[i] = ptr[j];
+ ptr[j] = tmp;
+ }
+ }
+
+ return ary;
+}
+
+/*
+ * call-seq:
+ * ary.shuffle -> new_ary
+ *
+ * Returns a new array with elements of self shuffled.
+ */
+
+static mrb_value
+mrb_ary_shuffle(mrb_state *mrb, mrb_value ary)
+{
+ mrb_value new_ary = mrb_ary_new_from_values(mrb, RARRAY_LEN(ary), RARRAY_PTR(ary));
+ mrb_ary_shuffle_bang(mrb, new_ary);
+
+ return new_ary;
+}
+
+/*
+ * call-seq:
+ * ary.sample -> obj
+ * ary.sample(n) -> new_ary
+ *
+ * Choose a random element or +n+ random elements from the array.
+ *
+ * The elements are chosen by using random and unique indices into the array
+ * in order to ensure that an element doesn't repeat itself unless the array
+ * already contained duplicate elements.
+ *
+ * If the array is empty the first form returns +nil+ and the second form
+ * returns an empty array.
+ */
+
+static mrb_value
+mrb_ary_sample(mrb_state *mrb, mrb_value ary)
+{
+ mrb_int n = 0;
+ mrb_bool given;
+ mt_state *random = NULL;
+ mrb_int len;
+
+ mrb_get_args(mrb, "|i?d", &n, &given, &random, &mt_state_type);
+ if (random == NULL) {
+ random = get_random_state(mrb);
+ }
+ mrb_random_rand_seed(mrb, random);
+ mt_rand(random);
+ len = RARRAY_LEN(ary);
+ if (!given) { /* pick one element */
+ switch (len) {
+ case 0:
+ return mrb_nil_value();
+ case 1:
+ return RARRAY_PTR(ary)[0];
+ default:
+ return RARRAY_PTR(ary)[mt_rand(random) % len];
+ }
+ }
+ else {
+ mrb_value result;
+ mrb_int i, j;
+
+ if (n < 0) mrb_raise(mrb, E_ARGUMENT_ERROR, "negative sample number");
+ if (n > len) n = len;
+ result = mrb_ary_new_capa(mrb, n);
+ for (i=0; i<n; i++) {
+ mrb_int r;
+
+ for (;;) {
+ retry:
+ r = mt_rand(random) % len;
+
+ for (j=0; j<i; j++) {
+ if (mrb_fixnum(RARRAY_PTR(result)[j]) == r) {
+ goto retry; /* retry if duplicate */
+ }
+ }
+ break;
+ }
+ mrb_ary_push(mrb, result, mrb_fixnum_value(r));
+ }
+ for (i=0; i<n; i++) {
+ mrb_ary_set(mrb, result, i, RARRAY_PTR(ary)[mrb_fixnum(RARRAY_PTR(result)[i])]);
+ }
+ return result;
+ }
+}
+
+
+void mrb_mruby_random_gem_init(mrb_state *mrb)
+{
+ struct RClass *random;
+ struct RClass *array = mrb->array_class;
+
+ mrb_define_method(mrb, mrb->kernel_module, "rand", mrb_random_g_rand, MRB_ARGS_OPT(1));
+ mrb_define_method(mrb, mrb->kernel_module, "srand", mrb_random_g_srand, MRB_ARGS_OPT(1));
+
+ random = mrb_define_class(mrb, "Random", mrb->object_class);
+ MRB_SET_INSTANCE_TT(random, MRB_TT_DATA);
+ mrb_define_class_method(mrb, random, "rand", mrb_random_g_rand, MRB_ARGS_OPT(1));
+ mrb_define_class_method(mrb, random, "srand", mrb_random_g_srand, MRB_ARGS_OPT(1));
+
+ mrb_define_method(mrb, random, "initialize", mrb_random_init, MRB_ARGS_OPT(1));
+ mrb_define_method(mrb, random, "rand", mrb_random_rand, MRB_ARGS_OPT(1));
+ mrb_define_method(mrb, random, "srand", mrb_random_srand, MRB_ARGS_OPT(1));
+
+ mrb_define_method(mrb, array, "shuffle", mrb_ary_shuffle, MRB_ARGS_OPT(1));
+ mrb_define_method(mrb, array, "shuffle!", mrb_ary_shuffle_bang, MRB_ARGS_OPT(1));
+ mrb_define_method(mrb, array, "sample", mrb_ary_sample, MRB_ARGS_OPT(2));
+
+ mrb_const_set(mrb, mrb_obj_value(random), mrb_intern_lit(mrb, "DEFAULT"),
+ mrb_obj_new(mrb, random, 0, NULL));
+}
+
+void mrb_mruby_random_gem_final(mrb_state *mrb)
+{
+}