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|
#!/bin/sh
#
# Extract comments containing copyright notices from C/C++ files
#
# Copyright (C) 2020 Patrick McDermott
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
set -eu
LF='
'
HT=' '
bufc=
bufi=
c=
getc()
{
if [ ${bufi} -ge ${bufc} ]; then
c=''
else
eval "c=\${bufv_${bufi}}"
bufi=$((${bufi} + 1))
fi
}
extract_cxx_comment()
{
local indent="${1}"
shift 1
local comment='//'
while :; do
getc
case "${c}" in
"${LF}")
break
;;
'')
printf '\tError: Unterminated C++ comment\n' \
1>&2
return 1
;;
*)
comment="${comment}${c}"
;;
esac
done
if printf '%s' "${comment}" | grep -Eqi \
'copyright|\(c\)|license|public domain'
then
printf '\t%s\n' "${indent}${comment}"
fi
return 0
}
extract_c_comment()
{
local indent="${1}"
shift 1
local comment='/*'
local asterisk=false
while :; do
getc
case "${c}" in
'*')
asterisk=true
comment="${comment}${c}"
;;
'/')
comment="${comment}${c}"
if ${asterisk}; then
break
fi
;;
'')
printf '\tError: Unterminated C comment\n' 1>&2
return 1
;;
*)
asterisk=false
comment="${comment}${c}"
;;
esac
done
if printf '%s' "${comment}" | grep -Eqi \
'copyright|\(c\)|license|public domain'
then
printf '%s\n' "${indent}${comment}" | sed 's/^/\t/'
fi
return 0
}
extract()
{
local fn="${1}"
shift 1
local newline=true
local indent=''
local quote=
printf '%s\n' "${fn}"
# Read file into array
eval "$(awk -v FS='' -v j=0 -v squote="'" -v esc_squote="'\\\\''" '
{
for (i = 1; i <= NF; ++i) {
sub(squote, esc_squote, $i);
printf("bufv_%d=" squote "%s" squote "\n",
j++, $i);
};
printf("bufv_%d=" squote "\n" squote "\n", j++);
}
END {
printf("bufc=%d", j);
}
')"
bufi=0
while :; do
getc
case "${c}" in
'/')
newline=false
getc
case "${c}" in
'/')
extract_cxx_comment "${indent}"\
|| return 1
;;
'*')
extract_c_comment "${indent}" \
|| return 1
;;
esac
;;
"${LF}")
newline=true
indent=''
;;
"${HT}" | ' ')
if ${newline}; then
indent="${indent}${c}"
fi
;;
"'" | '"')
newline=false
quote="${c}"
while :; do
getc
case "${c}" in
"${quote}")
break
;;
\\)
# This doesn't
# explicitly handle
# octal, hexadecimal, or
# Unicode sequences; but
# it's good enough to
# handle escaped quotes.
getc
;;
esac
done
;;
'')
break
;;
*)
newline=false
;;
esac
done
return 0
}
main()
{
local f=
if [ ${#} -eq 0 ]; then
extract 'INPUT' || return 1
else
for f in "${@}"; do
if [ x"${f}" = x'-' ]; then
extract 'INPUT' || return 1
else
extract "${f}" 0<"${f}" || return 1
fi
done
fi
return 0
}
main "${@}"
|
