Merge branch 'olesenm'

bin/tools/pre-commit-hook

@@ -49,9 +49,10 @@
 #     test the specified files/directories for standards conformance.
 #
 #------------------------------------------------------------------------------
+hookName="pre-commit"
 die()
 {
-    echo 'pre-commit hook failure' 1>&2
+    echo '$hookName hook failure' 1>&2
     echo '-----------------------' 1>&2
     echo '' 1>&2
     echo "$@" 1>&2
@@ -104,7 +105,7 @@ dieOnBadFiles()
 {
     if [ -n "$badFiles" ]
     then
-        echo 'pre-commit hook failure' 1>&2
+        echo '$hookName hook failure' 1>&2
         echo '-----------------------' 1>&2
         echo "$@" 1>&2
         echo '' 1>&2
@@ -116,22 +117,38 @@ dieOnBadFiles()
 }
 
 
+#
+# qualify 'git grep' to check cached value or from a specific commit
+#
+gitScope()
+{
+    if [ "$#" -gt 0 ]
+    then
+        echo "$1:"
+    else
+        echo "--cached -- "
+    fi
+}
+
+
 #
 # check for bad strings, characters, etc
 #
 checkIllegalCode()
 {
-    echo "pre-commit: check bad strings/characters etc ..." 1>&2
+    echo "$hookName: check bad strings/characters etc ..." 1>&2
 
     reBad="(N""abla|"$'\t'")"
     msgBad="N""abla or <TAB>"
 
+    scope=$(gitScope $@)
+
     badFiles=$(
     for f in $fileList
     do
         # parse line numbers from grep output:
         #        <lineNr>:   contents
-        lines=$(git grep --cached -E -hn -e "$reBad" -- "$f" |
+        lines=$(git grep -E -hn -e "$reBad" $scope"$f" |
             sed -e 's@:.*@@' |
             tr '\n' ' '
         )
@@ -149,7 +166,9 @@ checkIllegalCode()
 checkCopyright()
 {
     year=$(date +%Y)
-    echo "pre-commit: check copyright ..." 1>&2
+    echo "$hookName: check copyright ..." 1>&2
+
+    scope=$(gitScope $@)
 
     badFiles=$(
     for f in $fileList
@@ -160,10 +179,10 @@ checkCopyright()
         # parse line numbers from grep output:
         #        <lineNr>:   contents
         #
-        lines=$(git grep --cached -F -hn -e Copyright \
+        lines=$(git grep -F -hn -e Copyright \
             --and -e OpenCFD \
             --and --not -e "$year" \
-            -- "$f" |
+            $scope"$f" |
             sed -e 's@:.*@@' |
             tr '\n' ' '
         )
@@ -180,7 +199,9 @@ checkCopyright()
 #
 checkLineLength()
 {
-    echo "pre-commit: check line lengths ..." 1>&2
+    echo "$hookName: check line lengths ..." 1>&2
+
+    scope=$(gitScope $@)
 
     badFiles=$(
     for f in $fileList
@@ -190,7 +211,7 @@ checkLineLength()
         (*.[CH])
             # parse line numbers from grep output:
             #        <lineNr>:   contents
-            lines=$(git grep --cached -hn -e '^.\{81,\}' -- "$f" |
+            lines=$(git grep -hn -e '^.\{81,\}' $scope"$f" |
                 sed -e 's@:.*@@' |
                 tr '\n' ' '
             )
@@ -209,7 +230,9 @@ checkLineLength()
 #
 checkLineLengthNonComments()
 {
-    echo "pre-commit: check line lengths ..." 1>&2
+    echo "$hookName: check line lengths ..." 1>&2
+
+    scope=$(gitScope $@)
 
     badFiles=$(
     for f in $fileList
@@ -219,9 +242,9 @@ checkLineLengthNonComments()
         (*.[CH])
             # parse line numbers from grep output:
             #        <lineNr>:   contents
-            lines=$(git grep --cached -hn -e '^.\{81,\}' \
+            lines=$(git grep -hn -e '^.\{81,\}' \
                 --and --not -e "^ *//" \
-                -- "$f" |
+                $scope"$f" |
                 sed -e 's@:.*@@' |
                 tr '\n' ' '
             )
@@ -234,12 +257,15 @@ checkLineLengthNonComments()
     dieOnBadFiles "Limit code to 80 columns before pushing"
 }
 
+
 #
 # limit line length to 80-columns, except #directive lines
 #
 checkLineLengthNonDirective()
 {
-    echo "pre-commit: check line lengths ..." 1>&2
+    echo "$hookName: check line lengths ..." 1>&2
+
+    scope=$(gitScope $@)
 
     badFiles=$(
     for f in $fileList
@@ -249,9 +275,9 @@ checkLineLengthNonDirective()
         (*.[CH])
             # parse line numbers from grep output:
             #        <lineNr>:   contents
-            lines=$(git grep --cached -hn -e '^.\{81,\}' \
+            lines=$(git grep -hn -e '^.\{81,\}' \
                 --and --not -e "^ *#" \
-                -- "$f" |
+                $scope"$f" |
                 sed -e 's@:.*@@' |
                 tr '\n' ' '
             )
@@ -265,9 +291,9 @@ checkLineLengthNonDirective()
 }
 
 
-
-# do all checks
-# ~~~~~~~~~~~~~
+#------------------------------------------------------------------------------
+# Main code : do all checks
+#
 
 # builtin whitespace check to avoid trailing space, including CR-LF endings
 bad=$(git diff-index --cached --check $against --) || die "$bad"

bin/tools/pre-receive-hook

+#!/bin/bash
+#---------------------------------*- sh -*-------------------------------------
+# =========                 |
+# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+#  \\    /   O peration     |
+#   \\  /    A nd           | Copyright (C) 2010-2010 OpenCFD Ltd.
+#    \\/     M anipulation  |
+#------------------------------------------------------------------------------
+# License
+#     This file is part of OpenFOAM.
+#
+#     OpenFOAM 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.
+#
+#     OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+#
+# Script
+#     pre-receive-hook
+#
+# Description
+#     pre-receive hook for git.
+#     Copy or link this file as ".git/hooks/pre-receive"
+#
+#     Eg,
+#     (
+#         cd $WM_PROJECT_DIR/.git/hooks &&
+#         ln -sf ../../bin/tools/pre-receive-hook pre-receive
+#     )
+#
+#     Hook receives: <old-sha1> <new-sha1> <ref-name>
+#
+#     Checks for
+#     - illegal code, e.g. <TAB>
+#     - copyright is current, e.g. if present, contains XXX-<current-year>
+#     - columns greater than 80 for *.[CH] files
+#
+#------------------------------------------------------------------------------
+hookName="pre-receive"
+die()
+{
+    echo '$hookName hook failure' 1>&2
+    echo '-----------------------' 1>&2
+    echo '' 1>&2
+    echo "$@" 1>&2
+    echo '' 1>&2
+    exit 1
+}
+
+#-----------------------------------------------------------------------------
+
+unset fileList
+unset badFiles
+# join list of files with this amount of space
+Indent="    "
+
+#
+# report bad files and die if there are any
+#
+dieOnBadFiles()
+{
+    if [ -n "$badFiles" ]
+    then
+        echo '$hookName hook failure' 1>&2
+        echo '-----------------------' 1>&2
+        echo "$@" 1>&2
+        echo '' 1>&2
+        echo "File(s):" 1>&2
+        echo "$badFiles" 1>&2
+        echo ''  1>&2
+        exit 1
+    fi
+}
+
+
+#
+# qualify 'git grep' to check cached value or from a specific commit
+#
+gitScope()
+{
+    if [ "$#" -gt 0 ]
+    then
+        echo "$1:"
+    else
+        echo "--cached -- "
+    fi
+}
+
+
+#
+# check for bad strings, characters, etc
+#
+checkIllegalCode()
+{
+    echo "$hookName: check bad strings/characters etc ..." 1>&2
+
+    reBad="(N""abla|"$'\t'"|"$'\r\n'")"
+    msgBad="N""abla, <TAB> or DOS-line-endings"
+
+    scope=$(gitScope $@)
+
+    badFiles=$(
+    for f in $fileList
+    do
+        # parse line numbers from grep output:
+        #        <lineNr>:   contents
+        lines=$(git grep -E -hn -e "$reBad" $scope"$f" |
+            sed -e 's@:.*@@' |
+            tr '\n' ' '
+        )
+        [ -n "$lines" ] && echo "$Indent$f -- lines: $lines"
+    done
+    )
+
+    dieOnBadFiles "Remove/correct bad '$msgBad' references"
+}
+
+
+#
+# check that OpenCFD copyright is current
+#
+checkCopyright()
+{
+    year=$(date +%Y)
+    echo "$hookName: check copyright ..." 1>&2
+
+    scope=$(gitScope $@)
+
+    badFiles=$(
+    for f in $fileList
+    do
+        # NB: need to have OpenCFD on a separate line to prevent
+        #     this check being caught by itself!
+        #
+        # parse line numbers from grep output:
+        #        <lineNr>:   contents
+        #
+        lines=$(git grep -F -hn -e Copyright \
+            --and -e OpenCFD \
+            --and --not -e "$year" \
+            $scope"$f" |
+            sed -e 's@:.*@@' |
+            tr '\n' ' '
+        )
+        [ -n "$lines" ] && echo "$Indent$f -- lines: $lines"
+    done
+    )
+
+    dieOnBadFiles "Update copyright year, e.g. XXXX-$year"
+}
+
+
+#
+# limit line length to 80-columns
+#
+checkLineLength()
+{
+    echo "$hookName: check line lengths ..." 1>&2
+
+    scope=$(gitScope $@)
+
+    badFiles=$(
+    for f in $fileList
+    do
+        # limit to *.[CH] files
+        case "$f" in
+        (*.[CH])
+            # parse line numbers from grep output:
+            #        <lineNr>:   contents
+            lines=$(git grep -hn -e '^.\{81,\}' $scope"$f" |
+                sed -e 's@:.*@@' |
+                tr '\n' ' '
+            )
+            [ -n "$lines" ] && echo "$Indent$f -- lines: $lines"
+        ;;
+        esac
+    done
+    )
+
+    dieOnBadFiles "Limit code to 80 columns before pushing"
+}
+
+
+#
+# limit line length to 80-columns, except C++ comment lines
+#
+checkLineLengthNonComments()
+{
+    echo "$hookName: check line lengths ..." 1>&2
+
+    scope=$(gitScope $@)
+
+    badFiles=$(
+    for f in $fileList
+    do
+        # limit to *.[CH] files
+        case "$f" in
+        (*.[CH])
+            # parse line numbers from grep output:
+            #        <lineNr>:   contents
+            lines=$(git grep -hn -e '^.\{81,\}' \
+                --and --not -e "^ *//" \
+                $scope"$f" |
+                sed -e 's@:.*@@' |
+                tr '\n' ' '
+            )
+            [ -n "$lines" ] && echo "$Indent$f -- lines: $lines"
+        ;;
+        esac
+    done
+    )
+
+    dieOnBadFiles "Limit code to 80 columns before pushing"
+}
+
+
+#
+# limit line length to 80-columns, except #directive lines
+#
+checkLineLengthNonDirective()
+{
+    echo "$hookName: check line lengths ..." 1>&2
+
+    scope=$(gitScope $@)
+
+    badFiles=$(
+    for f in $fileList
+    do
+        # limit to *.[CH] files
+        case "$f" in
+        (*.[CH])
+            # parse line numbers from grep output:
+            #        <lineNr>:   contents
+            lines=$(git grep -hn -e '^.\{81,\}' \
+                --and --not -e "^ *#" \
+                $scope"$f" |
+                sed -e 's@:.*@@' |
+                tr '\n' ' '
+            )
+            [ -n "$lines" ] && echo "$Indent$f -- lines: $lines"
+        ;;
+        esac
+    done
+    )
+
+    dieOnBadFiles "Limit code to 80 columns before pushing"
+}
+
+
+#------------------------------------------------------------------------------
+# Main code : do all checks
+#
+
+while read oldSHA1 newSHA1 refName
+do
+    unset fileList rawFileList
+
+    if [ "$newSHA1" = 0 ]
+    then
+        # ref to be deleted
+        continue
+    elif [ "$oldSHA1" = 0 ]
+    then
+        # ref to be created
+        rawFileList=$(git diff-tree --root $newSHA1)
+    else
+        # normal changes
+        rawFileList=$(git diff --name-only $oldSHA1..$newSHA1)
+    fi
+
+    #
+    # no files changed: can skip all the checks
+    #
+    [ -n "$rawFileList" ] || continue
+
+    fileList=$(
+    for f in $rawFileList
+    do
+        git cat-file -e $newSHA1:$f > /dev/null 2>&1 && echo "$f"
+    done
+    )
+
+    # check for illegal code, e.g. <TAB>, etc
+    checkIllegalCode $newSHA1
+
+    # ensure OpenCFD copyright contains correct year
+    checkCopyright $newSHA1
+
+    # ensure code conforms to 80 columns max
+    checkLineLengthNonDirective $newSHA1
+
+done
+
+
+exit 0
+#------------------------------------------------------------------------------

src/OpenFOAM/primitives/random/Random/random.3

-.\"	$NetBSD: random.3,v 1.4 1995/12/28 08:52:42 thorpej Exp $
-.\"
-.\" Copyright (c) 1983, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     from: @(#)random.3	6.5 (Berkeley) 4/19/91
-.\"
-.Dd April 19, 1991
-.Dt RANDOM 3
-.Os BSD 4.2
-.Sh NAME
-.Nm random ,
-.Nm srandom ,
-.Nm initstate ,
-.Nm setstate
-.Nd better random number generator; routines for changing generators
-.Sh SYNOPSIS
-.Fd #include <stdlib.h>
-.Ft long
-.Fn random void
-.Ft void
-.Fn srandom "unsigned seed"
-.Ft char *
-.Fn initstate "unsigned seed" "char *state" "int n"
-.Ft char *
-.Fn setstate "char *state"
-.Sh DESCRIPTION
-The
-.Fn random
-function
-uses a non-linear additive feedback random number generator employing a
-default table of size 31 long integers to return successive pseudo-random
-numbers in the range from 0 to
-.if t 2\u\s731\s10\d\(mi1.
-.if n (2**31)\(mi1.
-The period of this random number generator is very large, approximately
-.if t 16\(mu(2\u\s731\s10\d\(mi1).
-.if n 16*((2**31)\(mi1).
-.Pp
-The
-.Fn random Ns / Fn srandom
-have (almost) the same calling sequence and initialization properties as
-.Xr rand 3 Ns / Xr srand 3 .
-The difference is that
-.Xr rand
-produces a much less random sequence \(em in fact, the low dozen bits
-generated by rand go through a cyclic pattern.  All the bits generated by
-.Fn random
-are usable.  For example,
-.Sq Li random()&01
-will produce a random binary
-value.
-.Pp
-Unlike
-.Xr srand ,
-.Fn srandom
-does not return the old seed; the reason for this is that the amount of
-state information used is much more than a single word.  (Two other
-routines are provided to deal with restarting/changing random
-number generators).  Like
-.Xr rand 3 ,
-however,
-.Fn random
-will by default produce a sequence of numbers that can be duplicated
-by calling
-.Fn srandom
-with
-.Ql 1
-as the seed.
-.Pp
-The
-.Fn initstate
-routine allows a state array, passed in as an argument, to be initialized
-for future use.  The size of the state array (in bytes) is used by
-.Fn initstate
-to decide how sophisticated a random number generator it should use \(em the
-more state, the better the random numbers will be.
-(Current "optimal" values for the amount of state information are
-8, 32, 64, 128, and 256 bytes; other amounts will be rounded down to
-the nearest known amount.  Using less than 8 bytes will cause an error.)
-The seed for the initialization (which specifies a starting point for
-the random number sequence, and provides for restarting at the same
-point) is also an argument.
-The
-.Fn initstate
-function
-returns a pointer to the previous state information array.
-.Pp
-Once a state has been initialized, the
-.Fn setstate
-routine provides for rapid switching between states.
-The
-.Fn setstate
-function
-returns a pointer to the previous state array; its
-argument state array is used for further random number generation
-until the next call to
-.Fn initstate
-or
-.Fn setstate .
-.Pp
-Once a state array has been initialized, it may be restarted at a
-different point either by calling
-.Fn initstate
-(with the desired seed, the state array, and its size) or by calling
-both
-.Fn setstate
-(with the state array) and
-.Fn srandom
-(with the desired seed).
-The advantage of calling both
-.Fn setstate
-and
-.Fn srandom
-is that the size of the state array does not have to be remembered after
-it is initialized.
-.Pp
-With 256 bytes of state information, the period of the random number
-generator is greater than
-.if t 2\u\s769\s10\d,
-.if n 2**69
-which should be sufficient for most purposes.
-.Sh AUTHOR
-Earl T. Cohen
-.Sh DIAGNOSTICS
-If
-.Fn initstate
-is called with less than 8 bytes of state information, or if
-.Fn setstate
-detects that the state information has been garbled, error
-messages are printed on the standard error output.
-.Sh SEE ALSO
-.Xr rand 3
-.Sh HISTORY
-These
-functions appeared in
-.Bx 4.2 .
-.Sh BUGS
-About 2/3 the speed of
-.Xr rand 3 .

src/OpenFOAM/primitives/random/Random/random.c

-/*	$NetBSD: random.c,v 1.4 1995/12/28 08:52:43 thorpej Exp $	*/
-
-/*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#if defined(LIBC_SCCS) && !defined(lint)
-#if 0
-static char *sccsid = "from: @(#)random.c	5.9 (Berkeley) 2/23/91";
-#else
-static char *rcsid = "$NetBSD: random.c,v 1.4 1995/12/28 08:52:43 thorpej Exp $";
-#endif
-#endif /* LIBC_SCCS and not lint */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-/*
- * random.c:
- *
- * An improved random number generation package.  In addition to the standard
- * rand()/srand() like interface, this package also has a special state info
- * interface.  The initstate() routine is called with a seed, an array of
- * bytes, and a count of how many bytes are being passed in; this array is
- * then initialized to contain information for random number generation with
- * that much state information.  Good sizes for the amount of state
- * information are 32, 64, 128, and 256 bytes.  The state can be switched by
- * calling the setstate() routine with the same array as was initiallized
- * with initstate().  By default, the package runs with 128 bytes of state
- * information and generates far better random numbers than a linear
- * congruential generator.  If the amount of state information is less than
- * 32 bytes, a simple linear congruential R.N.G. is used.
- *
- * Internally, the state information is treated as an array of longs; the
- * zeroeth element of the array is the type of R.N.G. being used (small
- * integer); the remainder of the array is the state information for the
- * R.N.G.  Thus, 32 bytes of state information will give 7 longs worth of
- * state information, which will allow a degree seven polynomial.  (Note:
- * the zeroeth word of state information also has some other information
- * stored in it -- see setstate() for details).
- *
- * The random number generation technique is a linear feedback shift register
- * approach, employing trinomials (since there are fewer terms to sum up that
- * way).  In this approach, the least significant bit of all the numbers in
- * the state table will act as a linear feedback shift register, and will
- * have period 2^deg - 1 (where deg is the degree of the polynomial being
- * used, assuming that the polynomial is irreducible and primitive).  The
- * higher order bits will have longer periods, since their values are also
- * influenced by pseudo-random carries out of the lower bits.  The total
- * period of the generator is approximately deg*(2**deg - 1); thus doubling
- * the amount of state information has a vast influence on the period of the
- * generator.  Note: the deg*(2**deg - 1) is an approximation only good for
- * large deg, when the period of the shift register is the dominant factor.
- * With deg equal to seven, the period is actually much longer than the
- * 7*(2**7 - 1) predicted by this formula.
- */
-
-/*
- * For each of the currently supported random number generators, we have a
- * break value on the amount of state information (you need at least this
- * many bytes of state info to support this random number generator), a degree
- * for the polynomial (actually a trinomial) that the R.N.G. is based on, and
- * the separation between the two lower order coefficients of the trinomial.
- */
-#define	TYPE_0		0		/* linear congruential */
-#define	BREAK_0		8
-#define	DEG_0		0
-#define	SEP_0		0
-
-#define	TYPE_1		1		/* x**7 + x**3 + 1 */
-#define	BREAK_1		32
-#define	DEG_1		7
-#define	SEP_1		3
-
-#define	TYPE_2		2		/* x**15 + x + 1 */
-#define	BREAK_2		64
-#define	DEG_2		15
-#define	SEP_2		1
-
-#define	TYPE_3		3		/* x**31 + x**3 + 1 */
-#define	BREAK_3		128
-#define	DEG_3		31
-#define	SEP_3		3
-
-#define	TYPE_4		4		/* x**63 + x + 1 */
-#define	BREAK_4		256
-#define	DEG_4		63
-#define	SEP_4		1
-
-/*
- * Array versions of the above information to make code run faster --
- * relies on fact that TYPE_i == i.
- */
-#define	MAX_TYPES	5		/* max number of types above */
-
-static int degrees[MAX_TYPES] =	{ DEG_0, DEG_1, DEG_2, DEG_3, DEG_4 };
-static int seps [MAX_TYPES] =	{ SEP_0, SEP_1, SEP_2, SEP_3, SEP_4 };
-
-/*
- * Initially, everything is set up as if from:
- *
- *	initstate(1, &randtbl, 128);
- *
- * Note that this initialization takes advantage of the fact that srandom()
- * advances the front and rear pointers 10*rand_deg times, and hence the
- * rear pointer which starts at 0 will also end up at zero; thus the zeroeth
- * element of the state information, which contains info about the current
- * position of the rear pointer is just
- *
- *	MAX_TYPES * (rptr - state) + TYPE_3 == TYPE_3.
- */
-
-static long randtbl[DEG_3 + 1] = {
-	TYPE_3,
-	0x9a319039, 0x32d9c024, 0x9b663182, 0x5da1f342, 0xde3b81e0, 0xdf0a6fb5,
-	0xf103bc02, 0x48f340fb, 0x7449e56b, 0xbeb1dbb0, 0xab5c5918, 0x946554fd,
-	0x8c2e680f, 0xeb3d799f, 0xb11ee0b7, 0x2d436b86, 0xda672e2a, 0x1588ca88,
-	0xe369735d, 0x904f35f7, 0xd7158fd6, 0x6fa6f051, 0x616e6b96, 0xac94efdc,
-	0x36413f93, 0xc622c298, 0xf5a42ab8, 0x8a88d77b, 0xf5ad9d0e, 0x8999220b,
-	0x27fb47b9,
-};
-
-/*
- * fptr and rptr are two pointers into the state info, a front and a rear
- * pointer.  These two pointers are always rand_sep places aparts, as they
- * cycle cyclically through the state information.  (Yes, this does mean we
- * could get away with just one pointer, but the code for random() is more
- * efficient this way).  The pointers are left positioned as they would be
- * from the call
- *
- *	initstate(1, randtbl, 128);
- *
- * (The position of the rear pointer, rptr, is really 0 (as explained above
- * in the initialization of randtbl) because the state table pointer is set
- * to point to randtbl[1] (as explained below).
- */
-static long *fptr = &randtbl[SEP_3 + 1];
-static long *rptr = &randtbl[1];
-
-/*
- * The following things are the pointer to the state information table, the
- * type of the current generator, the degree of the current polynomial being
- * used, and the separation between the two pointers.  Note that for efficiency
- * of random(), we remember the first location of the state information, not
- * the zeroeth.  Hence it is valid to access state[-1], which is used to
- * store the type of the R.N.G.  Also, we remember the last location, since
- * this is more efficient than indexing every time to find the address of
- * the last element to see if the front and rear pointers have wrapped.
- */
-static long *state = &randtbl[1];
-static int rand_type = TYPE_3;
-static int rand_deg = DEG_3;
-static int rand_sep = SEP_3;
-static long *end_ptr = &randtbl[DEG_3 + 1];
-
-/*
- * srandom:
- *
- * Initialize the random number generator based on the given seed.  If the
- * type is the trivial no-state-information type, just remember the seed.
- * Otherwise, initializes state[] based on the given "seed" via a linear
- * congruential generator.  Then, the pointers are set to known locations
- * that are exactly rand_sep places apart.  Lastly, it cycles the state
- * information a given number of times to get rid of any initial dependencies
- * introduced by the L.C.R.N.G.  Note that the initialization of randtbl[]
- * for default usage relies on values produced by this routine.
- */
-void
-srandom(x)
-	u_int x;
-{
-	register int i, j;
-
-	if (rand_type == TYPE_0)
-		state[0] = x;
-	else {
-		j = 1;
-		state[0] = x;
-		for (i = 1; i < rand_deg; i++)
-			state[i] = 1103515245 * state[i - 1] + 12345;
-		fptr = &state[rand_sep];
-		rptr = &state[0];
-		for (i = 0; i < 10 * rand_deg; i++)
-			(void)random();
-	}
-}
-
-/*
- * initstate:
- *
- * Initialize the state information in the given array of n bytes for future
- * random number generation.  Based on the number of bytes we are given, and
- * the break values for the different R.N.G.'s, we choose the best (largest)
- * one we can and set things up for it.  srandom() is then called to
- * initialize the state information.
- *
- * Note that on return from srandom(), we set state[-1] to be the type
- * multiplexed with the current value of the rear pointer; this is so
- * successive calls to initstate() won't lose this information and will be
- * able to restart with setstate().
- *
- * Note: the first thing we do is save the current state, if any, just like
- * setstate() so that it doesn't matter when initstate is called.
- *
- * Returns a pointer to the old state.
- */
-char *
-initstate(seed, arg_state, n)
-	u_int seed;			/* seed for R.N.G. */
-	char *arg_state;		/* pointer to state array */
-	int n;				/* # bytes of state info */
-{
-	register char *ostate = (char *)(&state[-1]);
-
-	if (rand_type == TYPE_0)
-		state[-1] = rand_type;
-	else
-		state[-1] = MAX_TYPES * (rptr - state) + rand_type;
-	if (n < BREAK_0) {
-		(void)fprintf(stderr,
-		    "random: not enough state (%d bytes); ignored.\n", n);
-		return 0;
-	}
-	if (n < BREAK_1) {
-		rand_type = TYPE_0;
-		rand_deg = DEG_0;
-		rand_sep = SEP_0;
-	} else if (n < BREAK_2) {
-		rand_type = TYPE_1;
-		rand_deg = DEG_1;
-		rand_sep = SEP_1;
-	} else if (n < BREAK_3) {
-		rand_type = TYPE_2;
-		rand_deg = DEG_2;
-		rand_sep = SEP_2;
-	} else if (n < BREAK_4) {
-		rand_type = TYPE_3;
-		rand_deg = DEG_3;
-		rand_sep = SEP_3;
-	} else {
-		rand_type = TYPE_4;
-		rand_deg = DEG_4;
-		rand_sep = SEP_4;
-	}
-	state = &(((long *)arg_state)[1]);	/* first location */
-	end_ptr = &state[rand_deg];	/* must set end_ptr before srandom */
-	srandom(seed);
-	if (rand_type == TYPE_0)
-		state[-1] = rand_type;
-	else
-		state[-1] = MAX_TYPES*(rptr - state) + rand_type;
-	return(ostate);
-}
-
-/*
- * setstate:
- *
- * Restore the state from the given state array.
- *
- * Note: it is important that we also remember the locations of the pointers
- * in the current state information, and restore the locations of the pointers
- * from the old state information.  This is done by multiplexing the pointer
- * location into the zeroeth word of the state information.
- *
- * Note that due to the order in which things are done, it is OK to call
- * setstate() with the same state as the current state.
- *
- * Returns a pointer to the old state information.
- */
-char *
-setstate(arg_state)
-	char *arg_state;
-{
-	register long *new_state = (long *)arg_state;
-	register int type = new_state[0] % MAX_TYPES;
-	register int rear = new_state[0] / MAX_TYPES;
-	char *ostate = (char *)(&state[-1]);
-
-	if (rand_type == TYPE_0)
-		state[-1] = rand_type;
-	else
-		state[-1] = MAX_TYPES * (rptr - state) + rand_type;
-	switch(type) {
-	case TYPE_0:
-	case TYPE_1:
-	case TYPE_2:
-	case TYPE_3:
-	case TYPE_4:
-		rand_type = type;
-		rand_deg = degrees[type];
-		rand_sep = seps[type];
-		break;
-	default:
-		(void)fprintf(stderr,
-		    "random: state info corrupted; not changed.\n");
-	}
-	state = &new_state[1];
-	if (rand_type != TYPE_0) {
-		rptr = &state[rear];
-		fptr = &state[(rear + rand_sep) % rand_deg];
-	}
-	end_ptr = &state[rand_deg];		/* set end_ptr too */
-	return(ostate);
-}
-
-/*
- * random:
- *
- * If we are using the trivial TYPE_0 R.N.G., just do the old linear
- * congruential bit.  Otherwise, we do our fancy trinomial stuff, which is
- * the same in all the other cases due to all the global variables that have
- * been set up.  The basic operation is to add the number at the rear pointer
- * into the one at the front pointer.  Then both pointers are advanced to
- * the next location cyclically in the table.  The value returned is the sum
- * generated, reduced to 31 bits by throwing away the "least random" low bit.
- *
- * Note: the code takes advantage of the fact that both the front and
- * rear pointers can't wrap on the same call by not testing the rear
- * pointer if the front one has wrapped.
- *
- * Returns a 31-bit random number.
- */
-long
-random()
-{
-	long i;
-
-	if (rand_type == TYPE_0)
-		i = state[0] = (state[0] * 1103515245 + 12345) & 0x7fffffff;
-	else {
-		*fptr += *rptr;
-		i = (*fptr >> 1) & 0x7fffffff;	/* chucking least random bit */
-		if (++fptr >= end_ptr) {
-			fptr = state;
-			++rptr;
-		} else if (++rptr >= end_ptr)
-			rptr = state;
-	}
-	return(i);
-}