Initial revisionv1_0_r2

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 100 insertions, 0 deletions

diff --git a/random.c b/random.c
new file mode 100644
index 0000000000..3fc9a0003f
--- /dev/null
+++ b/random.c
@@ -0,0 +1,100 @@
+/************************************************
+
+  random.c -
+
+  $Author$
+  $Date$
+  created at: Fri Dec 24 16:39:21 JST 1993
+
+  Copyright (C) 1993-1996 Yukihiro Matsumoto
+
+************************************************/
+
+#include "ruby.h"
+
+static int first = 1;
+static char state[256];
+
+static VALUE
+f_srand(argc, argv, obj)
+    int argc;
+    VALUE *argv;
+    VALUE obj;
+{
+    int seed, old;
+    static int saved_seed;
+
+    if (rb_scan_args(argc, argv, "01", &seed) == 0) {
+	seed = time(0);
+    }
+    else {
+	seed = NUM2INT(seed);
+    }
+
+#ifdef HAVE_RANDOM
+    if (first == 1) {
+	initstate(1, state, sizeof state);
+	first = 0;
+    }
+    else {
+	setstate(state);
+    }
+
+    srandom(seed);
+    old = saved_seed;
+    saved_seed = seed;
+
+    return int2inum(old);
+#else
+    srand(seed);
+    old = saved_seed;
+    saved_seed = seed;
+
+    return int2inum(old);
+#endif
+}
+
+static VALUE
+f_rand(obj, vmax)
+    VALUE obj, vmax;
+{
+    int val, max;
+
+#ifdef HAVE_RANDOM
+    if (first == 1) {
+	initstate(1, state, sizeof state);
+	first = 0;
+    }
+#endif
+
+    switch (TYPE(vmax)) {
+      case T_BIGNUM:
+	return big_rand(vmax);
+	
+      case T_FLOAT:
+	if (RFLOAT(vmax)->value > LONG_MAX || RFLOAT(vmax)->value < LONG_MIN)
+	    return big_rand(dbl2big(RFLOAT(vmax)->value));
+	break;
+    }
+
+    max = NUM2INT(vmax);
+    if (max == 0) ArgError("rand(0)");
+
+#ifdef HAVE_RANDOM
+    val = random() % max;
+#else
+    val = rand() % max;
+#endif
+
+    if (val < 0) val = -val;
+    return int2inum(val);
+}
+
+void
+Init_Random()
+{
+    extern VALUE mKernel;
+
+    rb_define_global_function("srand", f_srand, -1);
+    rb_define_global_function("rand", f_rand, 1);
+}