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|
# A kind of clone of dc geared towards binary operations.
# by Paolo Bonzini
#
# commands available:
# conversion commands
# b convert decimal to binary
# d convert binary to decimal
#
# arithmetic commands
# < shift left binary by decimal number of bits (11 3< gives 11000)
# > shift right binary by decimal number of bits (1011 2> gives 10)
# & binary AND (between two binary operands)
# | binary OR (between two binary operands)
# ^ binary XOR (between two binary operands)
# ~ binary NOT (between one binary operand)
#
# stack manipulation commands
# c clear stack
# P pop stack top
# D duplicate stack top
# x exchange top two elements
# r rotate stack counter-clockwise (second element becomes first)
# R rotate stack clockwise (last element becomes first)
#
# other commands
# l print stack (stack top is first)
# p print stack top
# q quit, print stack top if any (cq is quiet quit)
#
# The only shortcoming is that you'd better not attempt conversions of
# values above 1000 or so.
#
# This version does everything in pattern space (a la dc.sed).
# --------------------------------------------------------------------------
# This was actually used in a one-disk distribution of Linux to compute
# netmasks as follows (1 parameter => compute netmask e.g. 24 becomes
# 255.255.255.0; 2 parameters => given host address and netmask compute
# network and broadcast addresses):
#
# if [ $# = 1 ]; then
# OUTPUT='$1.$2.$3.$4'
# set 255.255.255.255 $1
# else
# OUTPUT='$1.$2.$3.$4 $5.$6.$7.$8'
# fi
#
# if [ `expr $2 : ".*\\."` -gt 0 ]; then
# MASK="$2 br b8<r b16<r b24< R|R|R|"
# else
# MASK="$2b 31b ^d D
# 11111111111111111111111111111111 x>1> x<1<"
# fi
#
# set `echo "$1 br b8<r b16<r b24< R|R|R| D # Load address
# $MASK D ~r # Load mask
#
# & DDD 24>dpP 16>11111111& dpP 8>11111111& dpP 11111111& dpP
# | DDD 24>dpP 16>11111111& dpP 8>11111111& dpP 11111111& dpP
# " | sed -f binary.sed`
#
# eval echo $OUTPUT
# --------------------------------------------------------------------------
1s/^/%%/
:cmd
s/\(.*%%\) *\([0-9][0-9]*\)/\2\
\1/
tcmd
s/%% *#.*/%%/
/%%$/ {
$b quit
N
}
/^.*%%D/ s/^[^\n]*\n/&&/
/^.*%%P/ s/^[^\n]*\n//
/^.*%%x/ s/^\([^\n]*\n\)\([^\n]*\n\)/\2\1/
/^.*%%r/ s/^\([^\n]*\n\)\([^%]*\)/\2\1/
/^.*%%R/ s/^\([^%]*\n\)\([^\n]*\n\)/\2\1/
/^.*%%c/ s/^.*%%/%%/
/^.*%%p/ P
/^.*%%l/ {
h
s/.%%.*//
p
g
}
/^.*%%q/ {
:quit
/^%%/!P
d
}
/^.*%%b/ {
# Decimal to binary via analog form
s/^\([^\n]*\)/-&;9876543210aaaaaaaaa/
:d2bloop1
s/\(a*\)-\(.\)\([^;]*;[0-9]*\2.\{9\}\(a*\)\)/\1\1\1\1\1\1\1\1\1\1\4-\3/
t d2bloop1
s/-;9876543210aaaaaaaaa/;a01!/
:d2bloop2
s/\(a*\)\1\(a\{0,1\}\)\(;\2.\(.\)[^!]*!\)/\1\3\4/
/^a/b d2bloop2
s/[^!]*!//
}
/^.*%%d/ {
# Binary to decimal via analog form
s/^\([^\n]*\)/-&;10a/
:b2dloop1
s/\(a*\)-\(.\)\([^;]*;[0-9]*\2.\(a*\)\)/\1\1\4-\3/
t b2dloop1
s/-;10a/;aaaaaaaaa0123456789!/
:b2dloop2
s/\(a*\)\1\1\1\1\1\1\1\1\1\(a\{0,9\}\)\(;\2.\{9\}\(.\)[^!]*!\)/\1\3\4/
/^a/b b2dloop2
s/[^!]*!//
}
/^.*%%&/ {
# Binary AND
s/\([^\n]*\)\n\([^\n]*\)/-\1-\2-111 01000/
:andloop
s/\([^-]*\)-\([^-]*\)\([^-]\)-\([^-]*\)\([^-]\)-\([01 ]*\3\5\([01]\)\)/\7\1-\2-\4-\6/
t andloop
s/^0*\([^-]*\)-[^\n]*/\1/
s/^\n/0&/
}
/^.*%%^/ {
# Binary XOR
s/\([^\n]*\)\n\([^\n]*\)/-\1-\2-000 01101/
b orloop
}
/^.*%%|/ {
# Binary OR
s/\([^\n]*\)\n\([^\n]*\)/-\1-\2-000 10111/
:orloop
s/\([^-]*\)-\([^-]*\)\([^-]\)-\([^-]*\)\([^-]\)-\([01 ]*\3\5\([01]\)\)/\7\1-\2-\4-\6/
t orloop
s/\([^-]*\)-\([^-]*\)-\([^-]*\)-[^\n]*/\2\3\1/
}
/^.*%%~/ {
# Binary NOT
s/^\(.\)\([^\n]*\n\)/\1-010-\2/
:notloop
s/\(.\)-0\{0,1\}\1\(.\)0\{0,1\}-\([01\n]\)/\2\3-010-/
t notloop
# If result is 00001..., \3 does not match (it looks for -10) and we just
# remove the table and leading zeros. If result is 0000...0, \3 matches
# (it looks for -0), \4 is a zero and we leave a lone zero as top of the
# stack.
s/0*\(1\{0,1\}\)\([^-]*\)-\(\1\(0\)\)\{0,1\}[^-]*-/\4\1\2/
}
/^.*%%</ {
# Left shift, convert to analog and add a binary digit for each analog digit
s/^\([^\n]*\)/-&;9876543210aaaaaaaaa/
:lshloop1
s/\(a*\)-\(.\)\([^;]*;[0-9]*\2.\{9\}\(a*\)\)/\1\1\1\1\1\1\1\1\1\1\4-\3/
t lshloop1
s/^\(a*\)-;9876543210aaaaaaaaa\n\([^\n]*\)/\2\1/
s/a/0/g
}
/^.*%%>/ {
# Right shift, convert to analog and remove a binary digit for each analog digit
s/^\([^\n]*\)/-&;9876543210aaaaaaaaa/
:rshloop1
s/\(a*\)-\(.\)\([^;]*;[0-9]*\2.\{9\}\(a*\)\)/\1\1\1\1\1\1\1\1\1\1\4-\3/
t rshloop1
s/^\(a*\)-;9876543210aaaaaaaaa\n\([^\n]*\)/\2\1/
:rshloop2
s/.a//
s/^aa*/0/
/a\n/b rshloop2
}
s/%%./%%/
tcmd
|
