SM msvcrt exports
Remember this post a user made a while back, demonstrating how you can get an executable's PEB? Well, inspiration tends to be pretty wild.
I wrote my own SourcePawn include that walks over the export table of the loaded msvcrt.dll module, grabs the RVAs of a bunch of stdlib.h functions (such as malloc and free), then sets up SDKCalls for them. Why? Why not, I thought this would be fun. It allowed me to learn a few things on the way as well.
If I ever get bored, I may write a Linux version of this as well. Feel free to bug me over it I suppose. :)
Go wild with this! For serious work however, I would advice towards using an extension instead.
GitHub repository
cstdlib.inc in GitHub repository