The library routine ZRegion() is invoked by metaclass()
and is occasionally useful in its own right for debugging purposes.
The imperfection is that ZRegion() returns 3 -- "it's a string" -- even
for values which lie above the region where this game's strings are stored.
Unfortunately, small negative numbers are just such values.
For example, ZRegion(-1) returns 3, when it could more usefully return 0. Add an additional test against $001A-->0 to the Z__Region code
defined in veneer.c.
About Patches
Issue C62122
ZRegion slightly imperfect
Submitted by: Roger Firth
Appeared in: Compiler 6.21 or before
Fixed in: Compiler 6.30
Problem
Solution
[ Z__Region addr;
if (addr == 0 || Unsigned__Compare(addr, $001A-->0) >= 0) rfalse;
if (addr>=1 && addr<=(#largest_object-255)) return 1;
if (Unsigned__Compare(addr, #strings_offset) >= 0) return 3;
if (Unsigned__Compare(addr, #code_offset) >= 0) return 2;
rfalse;
];
Last updated 2 May 2008. The librarian in charge of this page is Roger Firth. Please email any comments, suggestions or corrections to roger@firthworks.com.