A Forth interpreter

This is an implementation of a Forth interpreter in C for a POSIX environment, targeting conformance with ANSI X3.215-1994 (ANS Forth).

The code has a small handful of dependencies:

• Consistent with POSIX standard requirements, the C sources depend on a standard C compiler supporting the C99 standard or later.
• The C sources depend on the <stdio.h> library for file operations, not the POSIX system calls.
• The C sources depend on POSIX getopt().
• The C sources depend on GNU readline().
• The gen-dict script depends on a Bourne/POSIX style shell. This script is used to rebuild the dictionary after changing the Forth source.

The POSIX dependencies are minor, and should be easy to replace.

The dependency on GNU readline() is isolated to a single file, and should also be easy to replace.

The code is known to build and run on macOS and Linux systems. I haven't tested any other target.

The source is available under the terms of the GNU General Public License, v2.0. See the LICENSE file.

Purpose

This is done entirely for my own amusement, without any expectation that it will serve any practical purpose. Really, I just want to see what a Forth interpreter looks like when I write it.