#!/bin/sh -

LC_ALL=C
LANG=C
export LC_ALL LANG

#-
# Copyright (c) 1991, 1993
#	The Regents of the University of California.  All rights reserved.
# Copyright (c) 2026 Project Tick. All rights reserved.
#
# This code is derived from software contributed to Berkeley by
# Kenneth Almquist.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

temp=$(mktemp "${TMPDIR:-/tmp}/sh-mkbuiltins.XXXXXX")
srcdir=$1
havejobs=0
if grep '^#define[	 ]*JOBS[	 ]*1' $srcdir/shell.h > /dev/null
then	havejobs=1
fi
exec > builtins.c
cat <<\!
/*
 * This file was generated by the mkbuiltins program.
 */

#include <stdlib.h>
#include "shell.h"
#include "builtins.h"

!
awk '/^[^#]/ {if('$havejobs' || $2 != "-j") \
    print $0}' $srcdir/builtins.def | sed 's/-j//' > $temp
echo 'int (*const builtinfunc[])(int, char **) = {'
awk '/^[^#]/ {	printf "\t%s,\n", $1}' $temp
echo '};

const unsigned char builtincmd[] = {'
awk '{	for (i = 2 ; i <= NF ; i++) {
		if ($i == "-s") {
			spc = 1;
		} else if ($i == "-n") {
			# Handled later for builtins.h
			continue
		} else {
			printf "\t\"\\%03o\\%03o%s\"\n", length($i), (spc ? 128 : 0) + NR-1, $i
			spc = 0;
		}
	}}' $temp
echo '};'

exec > builtins.h
cat <<\!
/*
 * This file was generated by the mkbuiltins program.
 */

!
tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ < $temp |
	awk '{	printf "#define %s %d\n", $1, NR-1}'
echo '
#define BUILTIN_SPECIAL 0x80

extern int (*const builtinfunc[])(int, char **);
extern const unsigned char builtincmd[];
'
awk '{	printf "int %s(int, char **);\n", $1}' $temp

# Build safe_builtin_always()
cat <<EOF

static inline int
safe_builtin_always(int idx)
{
EOF
awk '
BEGIN { printed = 0 }
{
	for (i = 2 ; i <= NF ; i++) {
		if ($i == "-s") {
			continue
		} else if ($i == "-n") {
			nofork = 1;
		} else {
			if (nofork == 0) {
				continue
			}
			if (printed == 1) {
				printf " || \n\t    "
			} else {
				printf "\tif ("
			}
			printf "idx == " toupper($1)
			printed = 1
			nofork = 0;
			# Only need to check each once
			break
		}
	}
}' $temp

cat << EOF
)
		return (1);
	return(0);
}
EOF

rm -f $temp
