Initial import of 2001 code from http://www.dbit.com/pub/linux/macro11/

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+A MACRO-11 assembler for the PDP-11 in portable C source code.
+
+Copyright (c) 2001, Richard Krehbiel
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+o Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+o 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.
+
+o Neither the name of the copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT
+HOLDERS 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.
+
+
+Files:
+    macro11.c       This is the vast bulk of the code
+    object.c        Functions for writing RT-11 compatible .OBJ files
+    mlb.c           Classes (!) for reading RT-11 macro libraries
+    stream2.c       Functions for managing input streams and buffers
+    rad50.c         Functions for converting text to and from RAD50
+    util.c          A few general utility fuctions
+
+    macro11.h, object.h, mlb.h, stream2.h, rad50.h, util.h
+                    types and symbols exported from the associated sources.
+
+    dumpobj.c       A program I wrote to examine the output from
+                    RT-11's MACRO.SAV program and compare it with my
+                    own output.
+
+    makefile, depends
+                    A simple makfile for Linux; simple enough, it
+                    should be convertible to any Unix.
+
+    macro11.dsp, dumpobj.dsp, macro11.dsw
+                    Visual Studio 6 projects
+
+    README          This file
+
+    LICENSE         The copyright notice and license
+
+    CHANGES         A list of changes from previous versions
+
+    TODO            A list of things that may need fixing
+
+
+Notes:
+
+Sorry, I am a believer in 4 column hardware tabs, for a number of
+reasons, mostly regarding editing convenience.  (I did untabify this
+README file though.)
+
+The bulk of my development was done in Microsoft Visual Studio 6, but
+I also have a Linux partition and the Cygnus Windows toolkit, so you
+can send me "patches" and I will be able to apply them with the
+"patch" utility.
+
+The macro11 command line:
+
+macro11 [options...] files...
+
+Options:
+    -v              Prints program version.
+
+    -e opt          .ENABL option.  Implemented options are AMA, GBL,
+                    and also .LIST options ME, BEX, and
+                    MD, though the status of listing control is
+                    presently very poor.
+
+    -d opt          .DSABL option; same options as -e.
+
+    -m macname      Gives a macro library name.
+                    Up to 32 macro libraries may be specified, one per
+                    -m option.
+                    Note: unlike MACRO.SAV, SYSMAC.SML is not
+                    automatically included; you must name it.
+
+    -p macpath      For any .MCALL <macro> directive, macro11 will
+                    first search -m macro libraries, then it will
+                    search the MCALL path for a file named <macro>.MAC
+                    to locate the body of the macro.  The MCALL path
+                    is an environment variable containing directory
+                    names separated by delimiters (":" for Unix-style
+                    targets; ";" for Windows).  The -p command line
+                    options appends a directory name to the MCALL
+                    path.
+
+    -o objname      Gives the name of the object file.  No extension
+                    is assumed; if you want .OBJ you have to say it.
+                    With no -o option, no object file is generated.
+
+    -l lstname      Gives the name of a listing file.  The name "-"
+                    may be given to write the listing to stdout.  No
+                    extension is assumed; if you want .LST you have to
+                    say it.  With no -l option, no listing file is
+                    written.
+
+    -x              Tells macro11 not to assemble anything, but rather
+                    to simply extract all the macros in all the -m
+                    macro libraries into individual .MAC files in the
+                    current directory.  This should be the last option
+                    given, as none following will be processed.
+
+    files...        Any number of input files.  They will be assembled
+                    as if they were concatenated together.
+
+
+You may define the MCALL environment variable prior to invoking
+macro11, as a path to directories containing macros.