Convert the old-style (K&R) function definitions in plow/ to ANSI C
prototypes, formatted in the project's convention: the return type on its
own line and each parameter on its own line, indented four spaces, with
the original parameter comments retained.
Builds cleanly under GCC 16 / C23 (with the -std=gnu17 build change).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
and forcing it to be passed as an argument to all the callback
functions for the search routines that require it. Magic now
compiles and runs with the new code, but there are a number of
known issues that need to be fixed up. Committing now so that
I can rebase on the last update to the master branch.
However, various updates are needed to match changes in magic
over the years, including handling of non-manhattan geometry,
and handling of added DRC rules such as surround and extend.
Andreas Wendleder
R. Timothy Edwards
Darryl L. Miles