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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
# FNEXTN -- Extract the file name extension from a virtual file name (or a
# machine dependent file name. If the VFN contains no extension field, the
# null string is returned. The number of chars in the extension string is
# returned as the function value.
int procedure fnextn (vfn, outstr, maxch)
char vfn[ARB], outstr[maxch]
int maxch
int root_offset, extn_offset
int gstrcpy()
begin
call zfnbrk (vfn, root_offset, extn_offset)
if (vfn[extn_offset] != EOS)
extn_offset = extn_offset + 1
return (gstrcpy (vfn[extn_offset], outstr, maxch))
end
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