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scripts/utils.sh

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+#!/bin/sh
+#
+# Copyright 2005 Timo Hirvonen
+#
+# This file is licensed under the GPLv2.
+
+# initialization {{{
+
+LC_ALL=C
+LANG=C
+
+export LC_ALL LANG
+
+if test "$CDPATH"
+then
+	echo "Exporting CDPATH is dangerous and unnecessary!"
+	echo
+fi
+unset CDPATH
+
+__cleanup()
+{
+	if test "$DEBUG_CONFIGURE" = y
+	then
+		echo
+		echo "DEBUG_CONFIGURE=y, not removing temporary files"
+		ls .tmp-[0-9]*-*
+	else
+		rm -rf .tmp-[0-9]*-*
+	fi
+}
+
+__abort()
+{
+	# can't use "die" because stderr is often redirected to /dev/null
+	# (stdout could also be redirected but it's not so common)
+	echo
+	echo
+	echo "Aborting. configure failed."
+	# this executes __cleanup automatically
+	exit 1
+}
+
+# clean temporary files on exit
+trap '__cleanup' 0
+
+# clean temporary files and die with error message if interrupted
+trap '__abort' 1 2 3 13 15
+
+# }}}
+
+# config.mk variable names
+makefile_variables=""
+
+# cross compilation, prefix for CC, LD etc.
+# CROSS=
+
+# argc function_name $# min [max]
+argc()
+{
+	if test $# -lt 3 || test $# -gt 4
+	then
+		die "argc: expecting 3-4 arguments (got $*)"
+	fi
+
+	if test $# -eq 3
+	then
+		if test $2 -lt $3
+		then
+			die "$1: expecting at least $3 arguments"
+		fi
+	else
+		if test $2 -lt $3 || test $2 -gt $4
+		then
+			die "$1: expecting $3-$4 arguments"
+		fi
+	fi
+}
+
+# print warning message (all parameters)
+warn()
+{
+	echo "$@" >&2
+}
+
+# print error message (all parameters) and exit
+die()
+{
+	warn "$@"
+	exit 1
+}
+
+# usage: 'tmp_file .c'
+# get filename for temporary file
+tmp_file()
+{
+	if test -z "$__tmp_file_counter"
+	then
+		__tmp_file_counter=0
+	fi
+
+	while true
+	do
+		__tmp_filename=.tmp-${__tmp_file_counter}-${1}
+		__tmp_file_counter=`expr $__tmp_file_counter + 1`
+		test -f "$__tmp_filename" || break
+	done
+	echo "$__tmp_filename"
+}
+
+# get variable value
+#
+# @name:  name of the variable
+get_var()
+{
+	eval echo '"$'${1}'"'
+}
+
+# set variable by name
+#
+# @name:  name of the variable
+# @value: value of the variable
+set_var()
+{
+	eval $1='$2'
+}
+
+# set variable @name to @default IF NOT SET OR EMPTY
+#
+# @name:  name of the variable
+# @value: value of the variable
+var_default()
+{
+	test "`get_var $1`" || set_var $1 "$2"
+}
+
+# usage: echo $foo | to_upper
+to_upper()
+{
+	# stupid solaris tr doesn't understand ranges
+	tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
+}
+
+# portable which command
+path_find()
+{
+	case $1 in
+	*/*)
+		if test -x "$1"
+		then
+			echo "$1"
+			return 0
+		fi
+		return 1
+		;;
+	esac
+
+	_ifs="$IFS"
+	IFS=:
+	for __pf_i in $PATH
+	do
+		if test -x "$__pf_i/$1"
+		then
+			IFS="$_ifs"
+			echo "$__pf_i/$1"
+			return 0
+		fi
+	done
+	IFS="$_ifs"
+	return 1
+}
+
+show_usage()
+{
+	cat <<EOF
+Usage ./configure [-f FILE] [--prefix|bindir|datadir|libdir|mandir|docdir=VALUE] [OPTION=VALUE]...
+
+  -f FILE         Read OPTION=VALUE list from FILE (sh script)
+$USAGE
+EOF
+	exit 0
+}
+
+# @tmpfile: temporary file
+# @file:    file to update
+#
+# replace @file with @tmpfile if their contents differ
+update_file()
+{
+	if test -f "$2"
+	then
+		if cmp "$2" "$1" 2>/dev/null 1>&2
+		then
+			return 0
+		fi
+		echo "updating $2"
+	else
+		echo "creating $2"
+	fi
+	mv -f "$1" "$2"
+}