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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <ctype.h>
include <knet.h>
# FDIRNAME -- Return the concatenatable directory prefix for the named
# directory. If no vfn is given (null string), a path to the current
# directory is returned.
procedure fdirname (vfn, path, maxch)
char vfn[ARB] # VFN of directory
char path[ARB] # unpacked path to directory
int maxch
int len1, len2, ch
int gstrcpy()
begin
if (vfn[1] == EOS) {
# Null vfn; return current directory.
call strcpy ("./", path, maxch)
return
}
# Do we have an OS directory reference?
call zfxdir (vfn, path, maxch, len2)
ch = path[len2]
if (len2 > 0 && !(IS_ALNUM(ch) || ch == '_'))
return
# Do we have an "ldir$" or "subdir/"? If so, quit, else if the last
# char is a normal identifier class filename char, assume that we have
# a VFN and add the / delimiter. This technique is not infallible,
# and a better solution would be to have ZFXDIR or FDIRNAME itself
# execute on the remote node.
len1 = gstrcpy (vfn, path, maxch)
ch = path[len1]
if (ch == '$' || ch == '/')
return
# Must be a subdirectory of the form "subdir". Add the /.
path[len1+1] = '/'
path[len1+2] = EOS
end
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