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Diffstat (limited to 'contrib/libpcap/runlex.sh')
| -rwxr-xr-x | contrib/libpcap/runlex.sh | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/contrib/libpcap/runlex.sh b/contrib/libpcap/runlex.sh new file mode 100755 index 0000000..497a618 --- /dev/null +++ b/contrib/libpcap/runlex.sh @@ -0,0 +1,235 @@ +#! /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. +# +# @(#) $Header: /tcpdump/master/libpcap/runlex.sh,v 1.1.2.4 2007/12/31 03:39:06 guy Exp $ +# + +# +# 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="$1" +shift + +# +# Check whether we have Lex or Flex. +# +if [ -z "${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 $1" + ;; + + --|*) + # + # End of flags. + # + break + ;; + esac + shift +done + +# +# Is it Lex, or is it Flex? +# +if [ "${LEX}" = flex ] +then + # + # It's Flex. + # + have_flex=yes + + # + # Does it support the --noFUNCTION options? If so, we pass + # --nounput, as at least some versions that support those + # options don't support disabling yyunput by defining + # YY_NO_UNPUT. + # + if flex --help | egrep noFUNCTION >/dev/null + then + flags="$flags --nounput" + + # + # Does it support -R, for generating reentrant scanners? + # If so, we're not currently using that feature, but + # it'll generate some unused functions anyway - and there + # won't be any header file declaring them, so there'll be + # defined-but-not-declared warnings. Therefore, we use + # --noFUNCTION options to suppress generating those + # functions. + # + if flex --help | egrep reentrant >/dev/null + then + flags="$flags --noyyget_lineno --noyyget_in --noyyget_out --noyyget_leng --noyyget_text --noyyset_lineno --noyyset_in --noyyset_out" + fi + fi +else + # + # It's Lex. + # + have_flex=no +fi + +# +# OK, run it. +# If it's lex, it doesn't support -o, so we just write to +# lex.yy.c and, if it succeeds, rename it to the right name, +# otherwise we remove lex.yy.c. +# If it's flex, it supports -o, so we use that - flex with -P doesn't +# write to lex.yy.c, it writes to a lex.{prefix from -P}.c. +# +if [ $have_flex = yes ] +then + ${LEX} $flags -o"$outfile" "$@" + + # + # Did it succeed? + # + status=$? + if [ $status -ne 0 ] + then + # + # No. Exit with the failing exit status. + # + exit $status + fi + + # + # Flex has the annoying habit of stripping all but the last + # component of the "-o" flag argument and using that as the + # place to put the output. This gets in the way of building + # in a directory different from the source directory. Try + # to work around this. + # + # Is the outfile where we think it is? + # + outfile_base=`basename "$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" "$outfile" + + # + # Did that succeed? + # + status=$? + if [ $status -ne 0 ] + then + # + # No. Exit with the failing exit status. + # + exit $status + fi + fi +else + ${LEX} $flags "$@" + + # + # Did it succeed? + # + status=$? + if [ $status -ne 0 ] + then + # + # No. Get rid of any lex.yy.c file we generated, and + # exit with the failing exit status. + # + rm -f lex.yy.c + exit $status + fi + + # + # OK, rename lex.yy.c to the right output file. + # + mv lex.yy.c "$outfile" + + # + # Did that succeed? + # + status=$? + if [ $status -ne 0 ] + then + # + # No. Get rid of any lex.yy.c file we generated, and + # exit with the failing exit status. + # + rm -f lex.yy.c + exit $status + 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.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 "$outfile" .c`.h + +# +# Spew out the declaration. +# +cat <<EOF >$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 |
