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# Eggshell Linker entry point
#
# Copyright (C) 2015, 2016 Patrick "P. J." McDermott
#
# This file is part of the Eggshell Linker.
#
# The Eggshell Linker is free software: you can redistribute it
# and/or modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# The Eggshell Linker is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty
# of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the Eggshell Linker If not, see
# <http://www.gnu.org/licenses/>.
set -u
VERSION='0.1.0'
usage()
{
printf 'Usage: %s [option ...] <file>...\n' "${0}"
}
help()
{
usage
cat <<EOF
Options:
-h Display this information
-V Display linker version information
-I <interp> Use <interp> as the interpreter for your program, instead of the
default of "/bin/sh"
-e <entry> Use <entry> as the function for beginning execution of your
program, instead of the default of "main"
-o <output> Use <output> as the name of the program produced by eshld,
instead of the default of "out.sh"
EOF
}
version()
{
cat <<EOF
eshld ${VERSION}
Copyright (C) 2015 Patrick "P. J." McDermott
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
EOF
}
main()
{
local opt=
local interpreter=
local entry_point=
local output=
local make_executable=
local input=
interpreter='/bin/sh'
entry_point='main'
output='out.sh'
make_executable=true
while getopts 'hVI:e:o:' opt; do
case "${opt}" in
'h')
help
return 0
;;
'V')
version
return 0
;;
'I')
interpreter="${OPTARG}"
;;
'e')
entry_point="${OPTARG}"
;;
'o')
output="${OPTARG}"
;;
esac
done
shift $(($OPTIND - 1))
if [ ${#} -lt 1 ]; then
usage >&2
return 1
fi
if ! link_begin "${interpreter}" "${entry_point}" "${output}" \
${make_executable}; then
return 1
fi
for input in "${@}"; do
if ! link_file "${input}"; then
return 1
fi
done
if ! link_end; then
return 1
fi
return 0
}
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