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