JM> I am looking for some ANSI C code that will allow me to
 JM> get all the files in a directory that match a certain
 JM> wildcard.

 JM> It has to be portable.

Code which involves filesystems is never portable.

You'll get code which conditionally compiles for various different
environments, but that's not quite the same thing as "portable".

Perhaps the most widely adopted approach to the problem, however, is the
POSIX dirent set of functions [opendir(), closedir() et al). It is
implemented on all modern UNIX systems, most of which provide full POSIX
1.1 functionality anyway. There are emulations for this available for DOS,
VMS, OS/2 and - by now - probably the Win* environments as well. If you
have to compile for older UNIX systems, then there are some front-ends that
interface to most of the older libraries too.

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