Initial checkin.

[pdclib] / functions / stdlib / rand.c

diff --git a/functions/stdlib/rand.c b/functions/stdlib/rand.c
new file mode 100644 (file)
index 0000000..1ad3e91
--- /dev/null
+++ b/functions/stdlib/rand.c
@@ -0,0 +1,38 @@
+/* $Id$ */
+
+/* Release $Name$ */
+
+/* rand()
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdlib.h>
+
+#ifndef REGTEST
+
+int rand()
+{
+    _PDCLIB_seed = _PDCLIB_seed * 1103515245 + 12345;
+    return (unsigned int) ( _PDCLIB_seed / 65536 ) % 32768;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main()
+{
+    int rnd1, rnd2;
+    BEGIN_TESTS;
+    TESTCASE( ( rnd1 = rand() ) < RAND_MAX );
+    TESTCASE( ( rnd2 = rand() ) < RAND_MAX );
+    srand( 1 );
+    TESTCASE( rand() == rnd1 );
+    TESTCASE( rand() == rnd2 );
+    return TEST_RESULTS;
+}
+
+#endif