More from github issue 229: mark routines in util/dlb_main.c which
don't return as such and add some 'break' statements for compilers
that don't have support for that.
There was a post-3.6.2 discussion on a forum where someone had
tried to copy the NetHack 3.6.2 exe file overtop of an
existing NetHack 3.6.0 playground, and then try to run it.
We have never suggested trying that, nor do we attempt to
provide any backward or forward compatibility between the
supporting files found in nhdat that would allow that. Any
particular version of NetHack expects to have matching
support files designed and matched to that version.
This adds optional support for helping to prevent the
opening of nhdat containing support files from an
unmatched version of NetHack.
If you #define VERSION_IN_DLB_FILENAME in your
platform's include/*conf.h file, it will use a
name such as nhdat362, instead of plain nhdat, and
will exit more gracefully than the fault/crash
mentioned in the discussion if it doesn't find the
file it is looking for.
Developers - please note that if you do
to cause NetHack to look for an nhdat* file with
the version info appended to the name, you will likely
have to modify your build/clean/spotless mechanics
beyond the C compile itself to properly deal with the
new generated file name.
I'll push a formatting guide at some point. There may still be
outstanding changes, but please feel free to resolve those as you arrive
a them.
To the best of my knowledge, there is no changes to the actual code
content, but the formatter does have the occasional bug. If you run into
an issue, please fix it!
From the newsgroup: if someone adds too many new special levels, dlb
creation during install will give a warning but still exit with success,
and the subsequent installation won't know that the excess files need to be
placed in the playground separately. The result is that some files will
be missing when nethack tries to access them. The newsgroup thread states
that slash'em increased dlb's default limit of 200 files to 300, and the
unnethack variant increased it to 250 and also changed the overflow message
into an error that causes 'make' to quit. (The thread was initiated by
someone working on his own, not affiliated with either variant, who asked
for help figuring out why nethack couldn't find files at the end of the
alphabet. My answer didn't help much; I thought he was working with
separate files rather than with a DLB container.)
I started to go with the too-many-files-is-an-error fix, but instead
went the GNU route ("no arbitrary limits") and made the number of allowed
files become dynamic. It starts at 200 and expands by increments of 40
when necessary.
Fix the problem From a bug report. His system has a logical name "DATA" pointing at some disk, and
when the dlb utility tried to open "data" for inclusion in the library
being built at install time, it attempted to access the wrong thing and
failed. He then attempted to fix it in a manner which let dlb finish, by
modifying dlb_main.c to append "." to file names that lack a dot, but
then nethack couldn't access "dungeon" in the library because string
comparison didn't match the altered dlb directory entry of "dungeon.".
NetHack was working around this unintended interaction with the
environment issue in fopen_datafile(), and dlb was doing so for fopen()
but not open(). This moves nethack's fixup out of src/files.c and into
sys/vms/vmsfiles.c, adds another routine there so that both open() and
fopen() are covered, and updates the vms Makefiles so that the various
utility programs all link with vmsfiles. (The build script vmsbuild.com
puts object files into a library and gets that last bit for free.)
