hsc was written in naked & masochistic ANSI-C. However, the handling of filenames is a system-dependant thing, which has to be adapted for every OS.
At the moement, hsc is supports AmigaOS and Unix. As I'm a lazy programmer, hsc uses a lot of strings, that expand to the size they currently need; this tries to compensate the fact that Mr. Kernigham and Mr. Ritchie never managed to understand the string concepts of BASIC, and forced the whole world to work with this zero-terminated character array shit.
Therefor, it more or less needs a linear address space without 64K-segmentation or similar bullshit. Otherwise, it could crash when processing bigger projects.
If you have problems compiling hsc or want to do a port to another OS, email me; for address, see footline.
