malloc memory allocation checking tool wanted

[geissler at D012S050]

Hello world,
I have an ugly memory allocation problem with malloc(), calloc() and free()
which leads to unexpected core-dumps at unexpected times.

Some years ago, I heard from a function toolset, published
in the C Users Journal, which checked the allocated memory ranges.
I'm working under an UNIX SysV.2 derivate called SINIX 5.22, so
I ask you:

Can I get this C-Code from some kind guy out there ?
Please send with email !

It's really urgent!

Thanks in advance

---
Norbert Geissler, SIEMENS-NIXDORF AG, SNI AP 154, Munich, Germany
UUCP: geissler at ap542.uucp       INTERNET: geissler%ap542 at ztivax.siemens.com
..for chess, that superb, cold, infinitely satisfying anodyne to life, I feel
the ardour of a lover, the humility of a disciple.  (Herbert Russel Wakefield)  The Famous Game of Chesse Play