1#!/usr/bin/env bash
2#
3# Script to rename DLL name within side deck.
4#
5
6# Stops execution if a command or pipeline has an error.
7set -e
8
9sidedeck=$1
10old_dll_name=$2
11new_dll_name=$3
12
13function error() {
14  printf "ERROR: %s\n" "$*"
15  exit 1
16}
17
18function usage() {
19cat <<EOF
20Usage: $(basename $0) <side deck file> <old dll name> <new dll name>:
21          [-h|--help] Display this help and exit.
22EOF
23}
24
25rename_dll_name_inside_side_deck() {
26
27if [[ -z "$sidedeck" || -z "$old_dll_name" || -z "$new_dll_name" ]]; then
28  usage
29  error "All 3 parameters must be specified."
30fi
31
32[[ -f "$sidedeck" ]] || error "The '$sidedeck' file must exists."
33
34old_len=${#old_dll_name}
35new_len=${#new_dll_name}
36
37if (( $new_len > $old_len )); then
38  error "New DLL name $new_dll_name must have $old_len characters or less."
39fi
40
41if ((padding_len=$old_len-$new_len )); then
42  pad=$(printf "%*s" $padding_len "")
43fi
44
45# Touch the temp. file and set the tag to 1047 first so the redirecting statement
46# will write in 1047 and not 819 encoding.
47touch $sidedeck.tmp; chtag -tc1047 $sidedeck.tmp
48sed "/ IMPORT /s/'$old_dll_name/$pad'$new_dll_name/g" $sidedeck > $sidedeck.tmp
49mv $sidedeck.tmp $sidedeck
50}
51
52function main() {
53  rename_dll_name_inside_side_deck
54}
55
56main "$@"
57
58