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|
#! /bin/sh
#
# runlex.sh
# Script to run Lex/Flex.
# First argument is the (quoted) name of the command; if it's null, that
# means that neither Flex nor Lex was found, so we report an error and
# quit.
#
# $Id$
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 2007 Gerald Combs
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
#
# Get the name of the command to run, and then shift to get the arguments.
#
if [ $# -eq 0 ]
then
echo "Usage: runlex <lex/flex command to run> [ arguments ]" 1>&2
exit 1
fi
LEX="$1"
shift
#
# Check whether we have it.
#
if [ -z "${LEX}" ]
then
echo "Neither lex nor flex was found" 1>&2
exit 1
fi
#
# Process the flags. We don't use getopt because we don't want to
# embed complete knowledge of what options are supported by Lex/Flex.
#
flags=""
outfile=lex.yy.c
while [ $# -ne 0 ]
do
case "$1" in
-o*)
#
# Set the output file name.
#
outfile=`echo "$1" | sed 's/-o\(.*\)/\1/'`
;;
-*)
#
# Add this to the list of flags.
#
flags="$flags $1"
;;
--|*)
#
# End of flags.
#
break
;;
esac
shift
done
#
# OK, run it.
#
${LEX} -o"$outfile" $flags "$@"
#
# Did it succeed?
#
if [ $? -ne 0 ]
then
#
# No. Exit with the failing exit status.
#
exit $?
fi
#
# Flex has the annoying habit of stripping all but the last component of
# the "-o" flag argument and using that as the place to put the output.
# This gets in the way of building in a directory different from the
# source directory. Try to work around this.
#
# Is the outfile where we think it is?
#
outfile_base=`basename "$outfile"`
if [ "$outfile_base" != "$outfile" -a \( ! -r "$outfile" \) -a -r "$outfile_base" ]
then
#
# No, it's not, but it is in the current directory. Put it
# where it's supposed to be.
#
mv "$outfile_base" "$outfile"
if [ $? -ne 0 ]
then
echo $?
fi
fi
#
# OK, now let's generate a header file declaring the relevant functions
# defined by the .c file; if the .c file is .../foo.c, the header file
# will be .../foo_lex.h.
#
# This works around some other Flex suckage, wherein it doesn't declare
# the lex routine before defining it, causing compiler warnings.
# XXX - newer versions of Flex support --header-file=, to generate the
# appropriate header file. With those versions, we should use that option.
#
#
# Get the name of the prefix; scan the source files for a %option prefix
# line. We use the last one.
#
prefix=`sed -n 's/%option[ ][ ]*prefix="\(.*\)".*/\1/p' "$@" | tail -1`
if [ ! -z "$prefix" ]
then
prefixline="#define yylex ${prefix}lex"
fi
#
# Construct the name of the header file.
#
header_file=`dirname "$outfile"`/`basename "$outfile" .c`_lex.h
#
# Spew out the declaration.
#
cat <<EOF >$header_file
/* This is generated by runlex.sh. Do not edit it. */
$prefixline
#ifndef YY_DECL
#define YY_DECL int yylex(void)
#endif
YY_DECL;
EOF
|
