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# Linking functions
#
# 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/>.
interpreter=
entry_point=
output=
make_executable=
die()
{
local fmt="${1}"
shift 1
printf "eshld: ${fmt}\n" "${@}" >&2
exit 2
}
link_begin()
{
local interp="${1}"
local entry="${2}"
local out="${3}"
local mkexec="${4}"
shift 4
interpreter="${interp}"
entry_point="${entry}"
output="${out}"
make_executable=${mkexec}
# Open output file.
if ! exec 3>"${output}~"; then
die 'Cannot open file "%s"' "${output}~"
fi
# Add magic number (with interpreter path), entry point name, and
# runtime library.
if ${make_executable}; then
printf '#!%s\n__entry=%s\n' "${interpreter}" "${entry_point}" \
>&3
cat "$(dirname "${0}")/../eshtrans/eshrt/eshrtbegin.sh2" >&3
fi
}
link_file()
{
local input="${1}"
if ! cat "${input}" >&3; then
die 'Cannot read file "%s"' "${input}"
fi
}
link_end()
{
# Add runtime library.
if ${make_executable}; then
cat "$(dirname "${0}")/../eshtrans/eshrt/eshrtend.sh2" >&3
fi
# Close output file, make it executable, and set its name.
exec 3>&-
if ${make_executable}; then
if ! chmod a+x "${output}~"; then
die 'Cannot set mode of file "%s"' "${output}~"
fi
fi
if ! mv "${output}~" "${output}"; then
die 'Cannot rename file to "%s"' "${output}"
fi
}
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