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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <syserr.h>
include <knet.h>
# FCHDIR -- Change the current working directory.
procedure fchdir (newdir)
char newdir[ARB]
int ip, status
pointer sp, vfn, osfn1, osfn2
int ki_extnode(), envfind()
errchk fmapfn, ki_extnode
begin
call smark (sp)
call salloc (vfn, SZ_FNAME, TY_CHAR)
call salloc (osfn1, SZ_PATHNAME, TY_CHAR)
call salloc (osfn2, SZ_PATHNAME, TY_CHAR)
call strcpy (newdir, Memc[vfn], SZ_FNAME)
# Check for names of the form "node!" and convert them into
# "node!home$". This will also convert the null string into
# a chdir to home$.
ip = ki_extnode (Memc[vfn], Memc[osfn1], SZ_PATHNAME, status)
if (newdir[ip+1] == EOS)
call strcat ("home$", Memc[vfn], SZ_FNAME)
# Try the name as is.
call fmapfn (Memc[vfn], Memc[osfn1], SZ_PATHNAME)
call strupk (Memc[osfn1], Memc[osfn1], SZ_PATHNAME)
call zfpath (Memc[osfn1], Memc[osfn2], SZ_PATHNAME, status)
call zfsubd (Memc[osfn2], SZ_PATHNAME, "", status)
call strpak (Memc[osfn2], Memc[osfn2], SZ_PATHNAME)
call zfchdr (Memc[osfn2], status)
# Try chdir ldir$.
if (status == ERR) {
call strcpy (Memc[vfn], Memc[osfn1], SZ_FNAME)
if (envfind (Memc[osfn1], Memc[osfn2], SZ_PATHNAME) > 0) {
call strcat ("$", Memc[osfn1], SZ_PATHNAME)
call fmapfn (Memc[osfn1], Memc[osfn2], SZ_PATHNAME)
call zfchdr (Memc[osfn2], status)
} else
status = ERR
}
call sfree (sp)
if (status == ERR)
call syserrs (SYS_FCHDIR, newdir)
end
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