source: vendor/NetBSD-ash/current/mkinit.sh

#! /bin/sh
#       $NetBSD: mkinit.sh,v 1.2 2004/06/15 23:09:54 dsl Exp $

# Copyright (c) 2003 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by David Laight.
#
# 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 NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.

srcs="$*"

nl='
'
openparen='('
backslash='\'

includes=' "shell.h" "mystring.h" "init.h" '
defines=
decles=
event_init=
event_reset=
event_shellproc=

for src in $srcs; do
        exec <$src
        decnl="$nl"
        while IFS=; read -r line; do
                [ "$line" = x ]
                case "$line " in
                INIT["{         "]* ) event=init;;
                RESET["{        "]* ) event=reset;;
                SHELLPROC["{    "]* ) event=shellproc;;
                INCLUDE[\ \     ]* )
                        IFS='   '
                        set -- $line
                        # ignore duplicates
                        [ "${includes}" != "${includes%* $2 }" ] && continue
                        includes="$includes$2 "
                        continue
                        ;;
                MKINIT\  )
                        # struct declaration
                        decles="$decles$nl"
                        while
                                read -r line
                                decles="${decles}${line}${nl}"
                                [ "$line" != "};" ]
                        do
                                :
                        done
                        decnl="$nl"
                        continue
                        ;;
                MKINIT["{       "]* )
                        # strip initialiser
                        def=${line#MKINIT}
                        comment="${def#*;}"
                        def="${def%;$comment}"
                        def="${def%%=*}"
                        def="${def% }"
                        decles="${decles}${decnl}extern${def};${comment}${nl}"
                        decnl=
                        continue
                        ;;
                \#define[\ \    ]* )
                        IFS='   '
                        set -- $line
                        # Ignore those with arguments
                        [ "$2" = "${2##*$openparen}" ] || continue
                        # and multiline definitions
                        [ "$line" = "${line%$backslash}" ] || continue
                        defines="${defines}#undef  $2${nl}${line}${nl}"
                        continue
                        ;;
                * ) continue;;
                esac
                # code for events
                ev="${nl}      /* from $src: */${nl}      {${nl}"
                while
                        read -r line
                        [ "$line" != "}" ]
                do
                        # The C program indented by an extra 6 chars using
                        # tabs then spaces. I need to compare the output :-(
                        indent=6
                        while
                                l=${line#       }
                                [ "$l" != "$line" ]
                        do
                                indent=$(($indent + 8))
                                line="$l"
                        done
                        while
                                l=${line# }
                                [ "$l" != "$line" ]
                        do
                                indent=$(($indent + 1))
                                line="$l"
                        done
                        [ -z "$line" -o "$line" != "${line###}" ] && indent=0
                        while
                                [ $indent -ge 8 ]
                        do
                                ev="$ev "
                                indent="$(($indent - 8))"
                        done
                        while
                                [ $indent -gt 0 ]
                        do
                                ev="$ev "
                                indent="$(($indent - 1))"
                        done
                        ev="${ev}${line}${nl}"
                done
                ev="${ev}      }${nl}"
                eval event_$event=\"\$event_$event\$ev\"
        done
done

exec >init.c.tmp

echo "/*"
echo " * This file was generated by the mkinit program."
echo " */"
echo

IFS=' '
for f in $includes; do
        echo "#include $f"
done

echo
echo
echo
echo "$defines"
echo
echo "$decles"
echo
echo
echo "/*"
echo " * Initialization code."
echo " */"
echo
echo "void"
echo "init() {"
echo "${event_init%$nl}"
echo "}"
echo
echo
echo
echo "/*"
echo " * This routine is called when an error or an interrupt occurs in an"
echo " * interactive shell and control is returned to the main command loop."
echo " */"
echo
echo "void"
echo "reset() {"
echo "${event_reset%$nl}"
echo "}"
echo
echo
echo
echo "/*"
echo " * This routine is called to initialize the shell to run a shell procedure."
echo " */"
echo
echo "void"
echo "initshellproc() {"
echo "${event_shellproc%$nl}"
echo "}"

exec >&-
mv init.c.tmp init.c