Convert coreutils' rand*.{c,h,m4} into modules.

First step: move these files to gl/lib:
* lib/rand-isaac.c, lib/rand-isaac.h
* lib/randint.c, lib/randint.h
* lib/randperm.c, lib/randperm.h
* lib/randread.c, lib/randread.h

Step 2: add modules/rand* and remove now-unneeded .m4 files.
* gl/modules/randint: New file.
* gl/modules/randperm: New file.
* gl/modules/randread: New file.
* m4/randint.m4: Remove file.
* m4/randperm.m4: Remove file.
* m4/randread.m4: Remove file.

Step 3: use the new modules
* bootstrap.conf (gnulib_modules): Add randint and randperm.
* m4/prereq.m4 (gl_RANDINT, gl_RANDREAD, gl_RANDPERM): Don't require;
These have been removed.
(gl_ROOT_DEV_INO): Don't require; already handled via bootstrap.conf.

1 files changed, 43 insertions, 0 deletions

diff --git a/gl/lib/rand-isaac.h b/gl/lib/rand-isaac.h
new file mode 100644
index 000000000..94ca74f53
--- /dev/null
+++ b/gl/lib/rand-isaac.h
@@ -0,0 +1,43 @@
+/* Bob Jenkins's cryptographic random number generator, ISAAC.
+
+   Copyright (C) 1999-2005 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998, 1999 Colin Plumb.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   Written by Colin Plumb.  */
+
+#ifndef RAND_ISAAC_H
+# define RAND_ISAAC_H
+
+# include <stdint.h>
+
+/* Size of the state tables to use.  ISAAC_LOG should be at least 3,
+   and smaller values give less security.  */
+# define ISAAC_LOG 8
+# define ISAAC_WORDS (1 << ISAAC_LOG)
+# define ISAAC_BYTES (ISAAC_WORDS * sizeof (uint32_t))
+
+/* RNG state variables.  The members of this structure are private.  */
+struct isaac_state
+  {
+    uint32_t mm[ISAAC_WORDS];	/* Main state array */
+    uint32_t iv[8];		/* Seeding initial vector */
+    uint32_t a, b, c;		/* Extra index variables */
+  };
+
+void isaac_seed (struct isaac_state *);
+void isaac_refill (struct isaac_state *, uint32_t[ISAAC_WORDS]);
+
+#endif