core.stdc.stdlib.malloc & alignment

[captaindet via Digitalmars-d-learn]

is there an alignment guarantee for core.stdc.stdlib.malloc?

more specifically, using DMD and compiling for 32bit on windows, can i 
assume proper alignment for int or uint variables?

background: i like to re-use a (ubyte) buffer, sometimes it will store 
only bytes, sometimes it shall store uints.

thanks