configure.sh

   1 #!/bin/bash
   2 #
   3 # Configure.sh  Generates interactively a config.h from config.in
   4 #
   5 # net-tools     A collection of programs that form the base set of the
   6 #               NET-3 Networking Distribution for the LINUX operating
   7 #               system.
   8 #
   9 # Usage:        Install.sh [--nobackup] [--test]
  10 #
  11 # Version:      Install.sh 1.65 (1996-01-12)
  12 #
  13 # Authors:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  14 #               Johannes Grosen, <grosen@argv.cs.ndsu.nodak.edu>
  15 #               Copyright 1988-1993 MicroWalt Corporation
  16 #
  17 # Modified:
  18 #        {1.65} Bernd eckes Eckenfels <net-tools@lina.inka.de>
  19 #               some layout cleanups, slattach/plipconfig removed.
  20 #               --test for testinstallations added.
  21 #
  22 #               This program is free software; you can redistribute it
  23 #               and/or  modify it under  the terms of  the GNU General
  24 #               Public  License as  published  by  the  Free  Software
  25 #               Foundation;  either  version 2 of the License, or  (at
  26 #               your option) any later version.
  27 #
  28 #
  29 # Make sure we're really running bash.
  30 #
  31 # I would really have preferred to write this script in a language with
  32 # better string handling, but alas, bash is the only scripting language
  33 # that I can be reasonable sure everybody has on their Linux machine.
  34 #
  35
  36 CONFIG=config.h
  37 MAKECONFIG=config.make
  38
  39
  40 [ -z "$BASH" ] && { echo "Configure requires bash" 1>&2; exit 1; }
  41
  42 # Disable filename globbing once and for all.
  43 # Enable function cacheing.
  44 set -f -h
  45
  46 #
  47 # readln reads a line into $ans.
  48 #
  49 #       readln prompt default
  50 #
  51 function readln()
  52 {
  53   echo -n "$1"
  54   IFS='@' read ans </dev/tty || exit 1
  55   [ -z "$ans" ] && ans=$2
  56 }
  57
  58 # bool processes a boolean argument
  59 #
  60 #       bool tail
  61 #
  62 function bool()
  63 {
  64   # Slimier hack to get bash to rescan a line.
  65   eval "set -- $1"
  66   ans=""
  67   while [ "$ans" != "y" -a "$ans" != "n" ]
  68   do
  69         readln "$1 ($2) [$3] " "$3"
  70   done
  71   if [ "$ans" = "y" ]; then
  72         echo "#define $2 1" >>${CONFIG}
  73         echo "$2=1" >>${MAKECONFIG}
  74     else
  75         echo "#define $2 0" >>${CONFIG}
  76         echo "# $2=0" >> ${MAKECONFIG}
  77   fi
  78   raw_input_line="bool '$1' $2 $ans"
  79   eval "$2=$ans"
  80 }
  81
  82 # int processes an integer argument
  83 #
  84 #       int tail
  85 #
  86 function int()
  87 {
  88   # Slimier hack to get bash to rescan a line.
  89   eval "set -- $1"
  90   ans="x"
  91   while [ $[$ans+0] != "$ans" ];
  92   do
  93         readln "$1 ($2) [$3] " "$3"
  94   done
  95   echo "#define $2 ($ans)" >>${CONFIG}
  96   raw_input_line="int '$1' $2 $ans"
  97   eval "$2=$ans"
  98 }
  99
 100   #
 101   # Make sure we start out with a clean slate.
 102   #
 103   > config.new
 104   > ${CONFIG}
 105   > ${MAKECONFIG}
 106
 107   stack=''
 108   branch='t'
 109
 110   while IFS='@' read raw_input_line
 111   do
 112         # Slimy hack to get bash to rescan a line.
 113         read cmd rest <<-END_OF_COMMAND
 114                 $raw_input_line
 115         END_OF_COMMAND
 116
 117         if [ "$cmd" = "*" ]; then
 118                 if [ "$branch" = "t" ]; then
 119                         echo "$raw_input_line"
 120                         # echo "# $rest" >>$CONFIG
 121                         if [ "$prevcmd" != "*" ]; then
 122                                 echo >>${CONFIG}
 123                                 echo "/* $rest" >>${CONFIG}
 124                         else
 125                                 echo " * $rest" >>${CONFIG}
 126                         fi
 127                         prevcmd="*"
 128                 fi
 129         else
 130                 [ "$prevcmd" = "*" ] && echo " */" >>${CONFIG}
 131                 prevcmd=""
 132                 case "$cmd" in
 133                 =)      [ "$branch" = "t" ] && echo "$rest" >>${CONFIG};;
 134                 :)      [ "$branch" = "t" ] && echo "$raw_input_line" ;;
 135                 int)    [ "$branch" = "t" ] && int "$rest" ;;
 136                 bool)   [ "$branch" = "t" ] && bool "$rest" ;;
 137                 exec)   [ "$branch" = "t" ] && ( sh -c "$rest" ) ;;
 138                 if)     stack="$branch $stack"
 139                         if [ "$branch" = "t" ] && eval "$rest"; then
 140                                 branch=t
 141                         else
 142                                 branch=f
 143                         fi ;;
 144                 else)   if [ "$branch" = "t" ]; then
 145                                 branch=f
 146                         else
 147                                 read branch rest <<-END_OF_STACK
 148                                         $stack
 149                                 END_OF_STACK
 150                         fi ;;
 151                 fi)     [ -z "$stack" ] && echo "Error!  Extra fi." 1>&2
 152                         read branch stack <<-END_OF_STACK
 153                                 $stack
 154                         END_OF_STACK
 155                         ;;
 156                 esac
 157         fi
 158         echo "$raw_input_line" >>config.new
 159   done
 160   [ "$prevcmd" = "*" ] && echo " */" >>${CONFIG}
 161
 162   [ -z "$stack" ] || echo "Error!  Untermiated if." 1>&2
 163
 164   mv config.new config.status
 165   exit 0