This is a well-defined operation, so bwrite() should be able to
handle it. However, when running under glibc, fwrite() produces an
unexpected return value for 0-byte writes, which makes bwrite()
think that the write failed (causing a panic).
This change implements 0-byte writes by not calling into libc at
all, so that we don't have to worry about how to decode the return
value of fwrite().
When shortening/splitting wide lines I noticed that the save and
restore code for regions had a bunch of those and they could be
shortened by using an intermediate variable. Easier to read too.
Also, change several 'unsigned int' to just 'unsigned' as is used in
most of the rest of the code.
At one point I omitted a (genericptr_t) cast (which should no longer
be necessary...) and discovered that bwrite() wasn't declaring the
input buffer it never modifies as 'const'.
Move the core's global restoring flag (not the same as main()'s
local resuming flag) to a more logical place. Add a saving flag
in the process, but it isn't being set or cleared anywhere yet.
(Once in use it will probably fix the exception during save that
was just reported, but before that it would be useful to figure
out what specifically caused the event.)
The program_state struct really ought to be standalone rather
than part of struct g but I haven't made that change.
Removing an unused variable for wishing and some reformatting
that whent along with it got mixed in. Removes some trailing
whitespace in sfstruct.c too.
Only lightly tested...
A check into github issue 364 confirmed that
ba6edbe5dc
had incorrectly updated the bwrite sizeof entry for sysflags.
The SYSFLAGS and MFLOPPY code is all in the outdated part of the tree, so just
remove it rather than re-correct it.
Closes#364Closes#207
