cygwin_posix_path_list_p
#include <sys/cygwin.h>
int
cygwin_posix_path_list_p(const char *path);
This function tells you if the supplied
path is a POSIX-style path (i.e. posix names,
forward slashes, colon delimiters) or a Win32-style path (drive
letters, reverse slashes, semicolon delimiters. The return value is
true if the path is a POSIX path. Note that "_p" means "predicate", a
lisp term meaning that the function tells you something about the
parameter.