scripts/utils.sh

   1 #!/bin/sh
   2 #
   3 # Copyright 2005 Timo Hirvonen
   4 #
   5 # This file is licensed under the GPLv2.
   6
   7 # initialization {{{
   8
   9 LC_ALL=C
  10 LANG=C
  11
  12 export LC_ALL LANG
  13
  14 if test "$CDPATH"
  15 then
  16         echo "Exporting CDPATH is dangerous and unnecessary!"
  17         echo
  18 fi
  19 unset CDPATH
  20
  21 __cleanup()
  22 {
  23         if test "$DEBUG_CONFIGURE" = y
  24         then
  25                 echo
  26                 echo "DEBUG_CONFIGURE=y, not removing temporary files"
  27                 ls .tmp-[0-9]*-*
  28         else
  29                 rm -f .tmp-[0-9]*-*
  30         fi
  31 }
  32
  33 __abort()
  34 {
  35         # can't use "die" because stderr is often redirected to /dev/null
  36         # (stdout could also be redirected but it's not so common)
  37         echo
  38         echo
  39         echo "Aborting. configure failed."
  40         # this executes __cleanup automatically
  41         exit 1
  42 }
  43
  44 # clean temporary files on exit
  45 trap '__cleanup' 0
  46
  47 # clean temporary files and die with error message if interrupted
  48 trap '__abort' 1 2 3 13 15
  49
  50 # }}}
  51
  52 # config.mk variable names
  53 makefile_variables=""
  54
  55 # cross compilation, prefix for CC, LD etc.
  56 CROSS=
  57
  58 # argc function_name $# min [max]
  59 argc()
  60 {
  61         if test $# -lt 3 || test $# -gt 4
  62         then
  63                 die "argc: expecting 3-4 arguments (got $*)"
  64         fi
  65
  66         if test $# -eq 3
  67         then
  68                 if test $2 -lt $3
  69                 then
  70                         die "$1: expecting at least $3 arguments"
  71                 fi
  72         else
  73                 if test $2 -lt $3 || test $2 -gt $4
  74                 then
  75                         die "$1: expecting $3-$4 arguments"
  76                 fi
  77         fi
  78 }
  79
  80 # print warning message (all parameters)
  81 warn()
  82 {
  83         echo "$@" >&2
  84 }
  85
  86 # print error message (all parameters) and exit
  87 die()
  88 {
  89         warn "$@"
  90         exit 1
  91 }
  92
  93 # usage: 'tmp_file .c'
  94 # get filename for temporary file
  95 tmp_file()
  96 {
  97         if test -z "$__tmp_file_counter"
  98         then
  99                 __tmp_file_counter=0
 100         fi
 101
 102         while true
 103         do
 104                 __tmp_filename=.tmp-${__tmp_file_counter}-${1}
 105                 __tmp_file_counter=`expr $__tmp_file_counter + 1`
 106                 test -f "$__tmp_filename" || break
 107         done
 108         echo "$__tmp_filename"
 109 }
 110
 111 # get variable value
 112 #
 113 # @name:  name of the variable
 114 get_var()
 115 {
 116         eval echo '"$'${1}'"'
 117 }
 118
 119 # set variable by name
 120 #
 121 # @name:  name of the variable
 122 # @value: value of the variable
 123 set_var()
 124 {
 125         eval $1='$2'
 126 }
 127
 128 # set variable @name to @default IF NOT SET OR EMPTY
 129 #
 130 # @name:  name of the variable
 131 # @value: value of the variable
 132 var_default()
 133 {
 134         test "`get_var $1`" || set_var $1 "$2"
 135 }
 136
 137 # usage: echo $foo | to_upper
 138 to_upper()
 139 {
 140         # stupid solaris tr doesn't understand ranges
 141         tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
 142 }
 143
 144 # portable which command
 145 path_find()
 146 {
 147         case $1 in
 148         */*)
 149                 if test -x "$1"
 150                 then
 151                         echo "$1"
 152                         return 0
 153                 fi
 154                 return 1
 155                 ;;
 156         esac
 157
 158         _ifs="$IFS"
 159         IFS=:
 160         for __pf_i in $PATH
 161         do
 162                 if test -x "$__pf_i/$1"
 163                 then
 164                         IFS="$_ifs"
 165                         echo "$__pf_i/$1"
 166                         return 0
 167                 fi
 168         done
 169         IFS="$_ifs"
 170         return 1
 171 }
 172
 173 show_usage()
 174 {
 175         cat <<EOF
 176 Usage ./configure [-f FILE] [OPTION=VALUE]...
 177
 178   -f FILE         Read OPTION=VALUE list from FILE (sh script)
 179 $USAGE
 180 EOF
 181         exit 0
 182 }
 183
 184 # @tmpfile: temporary file
 185 # @file:    file to update
 186 #
 187 # replace @file with @tmpfile if their contents differ
 188 update_file()
 189 {
 190         if test -f "$2"
 191         then
 192                 if cmp "$2" "$1" 2>/dev/null 1>&2
 193                 then
 194                         return 0
 195                 fi
 196                 echo "updating $2"
 197         else
 198                 echo "creating $2"
 199         fi
 200         mv -f "$1" "$2"
 201 }