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From: ckctpa!crash@boake2 (Frank J. Edwards)
Newsgroups: comp.sys.amiga.tech
Subject: Re: realloc() missing from Manx c.lib ?
Message-ID: <365@ckctpa.UUCP>
Date: 20 Jan 90 15:06:05 GMT
Organization: ComputerKnowledge Corp, Clearwater FL
Lines: 58

Ross,

Don't feel bad -- it took me awhile to find it also!  I had actually
decoded how the malloc() call worked, and written my own realloc()!

The file you need is called "heapmem.o" (or it's other various flavors,
depending on what memory model you're using).  It can be included in the
link list by just specifying its name, i.e.

	ln -o indian chief.o big.o mem.o heapmem.o -lc

The Manx linker will automagically search the CLIB environment variable
for a list of directories to look in to find `heapmem.o' and `c.lib'.
So that's what's missing from the link line.  However, there's a bug
in the Version 3.6a `heapmem.o' for which I have included my patches.
Before explaining the patches, this is the file I'm working with.  First
of all, this bug DOES NOT apply to the 32-bit integer mode.  (Another
good reason to always use 32-bit ints :-).  Here is the file I patched:

Lib/heapmem.o   ----rwed  992  2 <date> <time>

In the following descriptions, realloc+<nn> is the location of the
instruction <nn> bytes after the realloc symbol AFTER linking.
However, there should only be one instance of each of the `from' patterns
given below, so a simple search for a binary value should find only one
match.  Use <insert_favorite_file_editor_here> to locate and patch each bug.

At or near location realloc+84, patch the following:

	from $2F2DFFFC		; move.l	-4(a5),-(a7)
	  to $3F2DFFFE		; move.w	-2(a5),-(a7)

This fixes a call to movmem() which expects (char *, char *, int)
and was being called as (char *, char *, long)!!!

Similarly, the stack will need to be cleaned up by 10 bytes now,
instead of 12.  At or near location realloc+100:

	from $4FEF000C		; lea		12(a7),a7
	  to $4FEF000A		; lea		10(a7),a7

Well, I hope this hasn't confused too many Manx users out there.  Maybe
it will explain to a few people why their code doesn't work!!  Of course,
I've never told Manx about any of this...  would someone care to do that?
Personally I think Amiga programmers _NEED_ a challenge like this to keep'em
on their toes :-) :-) :-)

-----
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-----
Frank J. Edwards		ComputerKnowledge Corp
2677 Arjay Court		12740 Hillcrest, Suite 212
Palm Harbor, FL  34684-4505	Dallas, TX  75230
Phone:  (813) 786-3675		(214) 385-9700 / (800) 227-9700