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[glibc/history.git] / scripts / rellns-sh
blobe4626cebd660bce39b0856054171b86ca511905d
1 #! /bin/sh
2 # rellns-sh - Simplified ln program to generate relative symbolic link.
3 # Copyright (C) 1996, 1997 Free Software Foundation, Inc.
4 # Written by Ulrich Drepper <drepper@cygnus.com>, October 1996
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2, or (at your option)
9 # any later version.
11 # This program is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 if test $# -ne 2; then
21 echo "Usage: rellns SOURCE DEST" >&2
22 exit 1
25 if test -x /bin/pwd; then
26 pwd=/bin/pwd
27 elif test -x /usr/bin/pwd; then
28 pwd=/usr/bin/pwd
29 else
30 pwd='pwd'
33 # Make both paths absolute.
34 if test -d $1; then
35 to=`cd $1 && $pwd`
36 else
37 temp=`echo $1 | sed 's%/*[^/]*$%%'`
38 if test -z "$temp"; then
39 to=`$pwd`
40 else
41 to=`cd $temp && $pwd`
43 to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
45 to=`echo $to | sed 's%^/%%'`
47 if test -d $2; then
48 from=`echo $2 | sed 's%/*$%%'`
49 else
50 from=`echo $2 | sed 's%/*[^/]*$%%'`
53 if test -z "$from"; then
54 from=`$pwd | sed 's%^/%%'`
55 else
56 from=`cd $from && $pwd | sed 's%^/%%'`
59 while test -n "$to" && test -n "$from"; do
60 preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`
61 prefrom=`echo $from | sed 's%^\([^/]*\)/.*%\1%'`
63 test "$preto" != "$prefrom" && break
65 to=`echo $to | sed 's%^[^/]*/*\(.*\)$%\1%'`
66 from=`echo $from | sed 's%^[^/]*/*\(.*\)$%\1%'`
67 done
69 while test -n "$from"; do
70 rfrom="../$rfrom"
71 from=`echo $from | sed 's%^[^/]*/*%%'`
72 done
74 ln -s $rfrom$to $2