#!/bin/sh
CC=gcc
CPP="gcc -E"
AWK=awk

HAVE_SYS_SIGNAME=0
HAVE_CPP_DD=1

e=echo

vq() {
	eval "$@"
}

rmf() {
	for _f in "$@"; do
		case ${_f} in
		mksh.1) ;;
		*) rm -f "${_f}" ;;
		esac
	done
}

if test 0 = $HAVE_SYS_SIGNAME; then
	if test 1 = $HAVE_CPP_DD; then
		$e Generating list of signal names...
	else
		$e No list of signal names available via cpp. Falling back...
	fi
	sigseenone=:
	sigseentwo=:
	echo '#include <signal.h>
#ifndef NSIG
#if defined(_NSIG)
#define NSIG _NSIG
#elif defined(SIGMAX)
#define NSIG (SIGMAX+1)
#endif
#endif
int
mksh_cfg= NSIG
;' >conftest.c
	# GNU sed 2.03 segfaults when optimising this to sed -n
	NSIG=`vq "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c" | \
	    grep '^mksh_cfg *=[	 ]*[0-9x ()+-]*.*$' | \
	    sed 's/^mksh_cfg *=[	 ]*\([0-9x ()+-][0-9x	 ()+-]*\).*$/\1/'`
	case $NSIG in
	*[\ \(\)+-]*) NSIG=`"$AWK" "BEGIN { print $NSIG }" </dev/null` ;;
	esac
	printf=printf
	(printf hallo) >/dev/null 2>&1 || printf=echo
	test $printf = echo || NSIG=`printf %d "$NSIG" 2>/dev/null`
	$printf "NSIG=$NSIG ... "
	sigs="INT SEGV ABRT KILL ALRM BUS CHLD CLD CONT DIL EMT FPE HUP ILL"
	sigs="$sigs INFO IO IOT LOST PIPE PROF PWR QUIT RESV SAK STOP SYS TERM"
	sigs="$sigs TRAP TSTP TTIN TTOU URG USR1 USR2 VTALRM WINCH XCPU XFSZ"
	test 1 = $HAVE_CPP_DD && test $NSIG -gt 1 && sigs="$sigs "`vq \
	    "$CPP $CFLAGS $CPPFLAGS $NOWARN -dD conftest.c" | \
	    grep '[	 ]SIG[A-Z0-9]*[	 ]' | \
	    sed 's/^\(.*[	 ]SIG\)\([A-Z0-9]*\)\([	 ].*\)$/\2/' | sort`
	test $NSIG -gt 1 || sigs=
	for name in $sigs; do
		case $sigseenone in
		*:$name:*) continue ;;
		esac
		sigseenone=$sigseenone$name:
		echo '#include <signal.h>' >conftest.c
		echo int >>conftest.c
		echo mksh_cfg= SIG$name >>conftest.c
		echo ';' >>conftest.c
		# GNU sed 2.03 croaks on optimising this, too
		vq "$CPP $CFLAGS $CPPFLAGS $NOWARN conftest.c" | \
		    grep '^mksh_cfg *=[	 ]*[0-9x]*.*$' | \
		    sed 's/^mksh_cfg *=[	 ]*\([0-9x]*\).*$/\1:'$name/
	done | sed -e '/^:/d' -e 's/:/ /g' | while read nr name; do
		test $printf = echo || nr=`printf %d "$nr" 2>/dev/null`
		test $nr -gt 0 && test $nr -le $NSIG || continue
		case $sigseentwo in
		*:$nr:*) ;;
		*)	echo "		{ \"$name\", $nr },"
			sigseentwo=$sigseentwo$nr:
			$printf "$name=$nr " >&2
			;;
		esac
	done 2>&1 >signames.inc
	rmf conftest.c
	$e done.
fi