Path: utzoo!attcan!uunet!munnari!murdu!strasser
From: strasser@murdu.OZ (Mike Strasser)
Newsgroups: comp.sys.mac.programmer
Subject: LSC malloc returning garbage?
Message-ID: <1451@murdu.OZ>
Date: 9 Sep 88 05:10:41 GMT
Reply-To: strasser@munnari.UUCP (Mike Strasser)
Organization: Forestry Section, University of Melbourne
Lines: 35

A month or so ago I posted a query about a program I'd ported to LSC
which had run extensively under VAX/VMS, Unix and MS-DOS, and which was
hanging.  Today I've had more time to check it out, and it seems that
malloc() is returning nonsense.

It is called and the result cast to a pointer to a structure I use:

	Sp = (Species *) malloc( sizeof( Species ) );

I check for a NULL return, which does not happen.  Instead, Sp is loaded
the value 0x00000003 every time on repeated calls! I'm assuming that the
statement:

	printf( "Sp is %08X\n", (unsigned long) Sp );

is OK as a way of checking the address (yes, I'm still using stdio).

00000003 is not a legal address is it?  malloc() certainly shouldn't be
returning the same value on repeated calls (no use of free() in
between)?  I have put in complete prototype checking (although in LSC
2.15 I had to write full prototypes for the library functions so the
compiler would pass them!) but it has not helped.

I still only have LSC 2.15 (waiting for 3.0).

Any ideas?  Have I missed something?

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Mike Strasser                ACSnet, CSnet:  strasser@murdu.oz
                             Internet:       strasser%murdu.oz@uunet.uu.net
Forestry Section
University of Melbourne
Creswick, Victoria.  3363    Phone: (053) 45 2405
A u s t r a l i a                   +61 53 45 2405
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