########################################################################
#                                                                      #
#               This software is part of the ast package               #
#          Copyright (c) 1982-2012 AT&T Intellectual Property          #
#          Copyright (c) 2020-2024 Contributors to ksh 93u+m           #
#                      and is licensed under the                       #
#                 Eclipse Public License, Version 2.0                  #
#                                                                      #
#                A copy of the License is available at                 #
#      https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html      #
#         (with md5 checksum 84283fa8859daf213bdda5a9f8d1be1d)         #
#                                                                      #
#                  David Korn <dgk@research.att.com>                   #
#                  Martijn Dekker <martijn@inlv.org>                   #
#            Johnothan King <johnothanking@protonmail.com>             #
#         hyenias <58673227+hyenias@users.noreply.github.com>          #
#                  Lev Kujawski <int21h@mailbox.org>                   #
#                      Phi <phi.debian@gmail.com>                      #
#                                                                      #
########################################################################

. "${SHTESTS_COMMON:-${0%/*}/_common}"

enum bool=(false true)

bool HAVE_signbit=false
if	typeset -f .sh.math.signbit >/dev/null && (( signbit(-NaN) ))
then	HAVE_signbit=true
else	warning "-lm does not support signbit(-NaN)"
fi

bool HAVE_posix=false
(set -o posix) 2>/dev/null && HAVE_posix=true	# not using [[ -o ?posix ]] as it's broken on 93v-

trap '' FPE # NOTE: osf.alpha requires this (no ieee math)

integer x=1 y=2 z=3
if	(( 2+2 != 4 ))
then	err_exit 2+2!=4
fi
if	((x+y!=z))
then	err_exit x+y!=z
fi
if	(($x+$y!=$z))
then	err_exit $x+$y!=$z
fi
if	(((x|y)!=z))
then	err_exit "(x|y)!=z"
fi
if	((y >= z))
then	err_exit "y>=z"
fi
if	((y+3 != z+2))
then	err_exit "y+3!=z+2"
fi
if	((y<<2 != 1<<3))
then	err_exit "y<<2!=1<<3"
fi
if	((133%10 != 3))
then	err_exit "133%10!=3"
	if	(( 2.5 != 2.5 ))
	then	err_exit 2.5!=2.5
	fi
fi
d=0
((d || 1)) || err_exit 'd=0; ((d||1))'
if	(( d++!=0))
then	err_exit "d++!=0"
fi
if	(( --d!=0))
then	err_exit "--d!=0"
fi
if	(( (d++,6)!=6 && d!=1))
then	err_exit '(d++,6)!=6 && d!=1'
fi
d=0
if	(( (1?2+1:3*4+d++)!=3 || d!=0))
then	err_exit '(1?2+1:3*4+d++) !=3'
fi
for	((i=0; i < 20; i++))
do	:
done
if	(( i != 20))
then	err_exit 'for (( expr)) failed'
fi
for	((i=0; i < 20; i++)); do	: ; done
if	(( i != 20))
then	err_exit 'for (( expr));... failed'
fi
for	((i=0; i < 20; i++)) do	: ; done
if	(( i != 20))
then	err_exit 'for (( expr))... failed'
fi
if	(( (i?0:1) ))
then	err_exit '(( (i?0:1) )) failed'
fi
if	(( (1 || 1 && 0) != 1 ))
then	err_exit '( (1 || 1 && 0) != 1) failed'
fi
if	(( (_=1)+(_x=0)-_ ))
then	err_exit '(_=1)+(_x=0)-_ failed'
fi
if	((  (3^6) != 5))
then	err_exit '((3^6) != 5) failed'
fi
integer x=1
if	(( (x=-x) != -1 ))
then	err_exit '(x=-x) != -1 failed'
fi
i=2
if	(( 1$(($i))3 != 123 ))
then	err_exit ' 1$(($i))3 failed'
fi
((pi=4*atan(1.)))
point=(
	float x
	float y
)
(( point.x = cos(pi/6), point.y = sin(pi/6) ))
if	(( point.x*point.x + point.y*point.y > 1.01 ))
then	err_exit 'cos*cos +sin*sin > 1.01'
fi
if	(( point.x*point.x + point.y*point.y < .99 ))
then	err_exit 'cos*cos +sin*sin < .99'
fi
if [[ $((y=x=1.5)) != 1 ]]
then	err_exit 'typecast not working in arithmetic evaluation'
fi
typeset -E x=1.5
( ((x++))  ) 2>/dev/null
if [[ $? == 0 ]]
then	err_exit 'postincrement of floating point allowed'
fi
( ((++x))  ) 2>/dev/null
if [[ $? == 0 ]]
then	err_exit 'preincrement of floating point allowed'
fi
x=1.5
( ((x%1.1))  ) 2>/dev/null
if [[ $? == 0 ]]
then	err_exit 'floating point allowed with % operator'
fi
x=.125
if	[[ $(( 4 * x/2 )) != 0.25 ]]
then	err_exit '(( 4 * x/2 )) is not 0.25, with x=.125'
fi
if	[[ $(( pow(2,3) )) != 8 ]]
then	err_exit '$(( pow(2,3) )) != 8'
fi
( [[ $(( pow(2,(3)) )) == 8 ]] ) 2> /dev/null
if	(( $? ))
then	err_exit '$(( pow(2,(3)) )) != 8'
fi
unset x
integer x=1; integer x=1
if	[[ $x != 1 ]]
then	err_exit 'two consecutive integer x=1 not working'
fi
unset z
{ z=$(typeset -RZ2 z2; (( z2 = 8 )); print $z2) ;} 2>/dev/null
if [[ $z != "08" ]]
then	err_exit "typeset -RZ2 leading 0 decimal not working [z=$z]"
fi
{ z=$(typeset -RZ3 z3; (( z3 = 8 )); print $z3) ;} 2>/dev/null
if [[ $z != "008" ]]
then	err_exit "typeset -RZ3 leading 0 decimal not working [z=$z]"
fi
unset z
typeset -Z3 z=010
(( z=z+1))
if	[[ $z != 011 ]]
then	err_exit "leading 0's in -Z not treated as decimal"
fi
unset x
integer x=0
if	[[ $((x+=1)) != 1  ]] || ((x!=1))
then	err_exit "+= not working"
	x=1
fi
x=1
if	[[ $((x*=5)) != 5  ]] || ((x!=5))
then	err_exit "*= not working"
	x=5
fi
if	[[ $((x%=4)) != 1  ]] || ((x!=1))
then	err_exit "%= not working"
	x=1
fi
if	[[ $((x|=6)) != 7  ]] || ((x!=7))
then	err_exit "|= not working"
	x=7
fi
if	[[ $((x&=5)) != 5  ]] || ((x!=5))
then	err_exit "&= not working"
	x=5
fi
function newscope
{
	float x=1.5
	(( x += 1 ))
	print -r -- $x
}
if	[[ $(newscope) != 2.5 ]]
then	err_exit "arithmetic using wrong scope"
fi
unset x
integer y[3]=9 y[4]=2 i=3
(( x = y[3] + y[4] ))
if	[[ $x != 11 ]]
then	err_exit "constant indexed array arithmetic failure"
fi
(( x = $empty y[3] + y[4] ))
if	[[ $x != 11 ]]
then	err_exit "empty constant indexed array arithmetic failure"
fi
(( x = y[i] + y[i+1] ))
if	[[ $x != 11 ]]
then	err_exit "variable subscript indexed array arithmetic failure"
fi
integer a[5]=3 a[2]=4
(( x = y[a[5]] + y[a[2]] ))
if	[[ $x != 11 ]]
then	err_exit "nested subscript indexed array arithmetic failure"
fi
unset y
typeset -Ai y
y[three]=9 y[four]=2
three=four
four=three
(( x = y[three] + y[four] ))
if	[[ $x != 11 ]]
then	err_exit "constant associative array arithmetic failure"
fi
(( x = y[$three] + y[$four] ))
if	[[ $x != 11 ]]
then	err_exit "variable subscript associative array arithmetic failure"
fi
$SHELL -nc '((a = 1))' 2> /dev/null || err_exit "sh -n fails with arithmetic"
$SHELL -nc '((a.b++))' 2> /dev/null || err_exit "sh -n fails with arithmetic2"
unset z
float z=7.5
if	{ (( z%2 != 1));} 2> /dev/null
then	err_exit '% not working on floating point'
fi
chr=(a ' ' '=' '\r' '\n' '\\' '\"' '$' "\\'" '[' ']' '(' ')' '<' '\xab' '\040' '`' '{' '}' '*' '\E')
if	(('a' == 97))
then	val=(97 32  61 13 10 92 34 36 39 91 93 40 41 60 171 32 96 123 125 42 27)
else	val=(129 64 126 13 21 224 127 91 125 173 189 77 93 76 171 32 121 192 208 92 39 21)
fi
q=0
for ((i=0; i < ${#chr[@]}; i++))
do	if	(( '${chr[i]}' != ${val[i]} ))
	then	err_exit "(( '${chr[i]}'  !=  ${val[i]} ))"
	fi
	if	[[ $(( '${chr[i]}' )) != ${val[i]} ]]
	then	err_exit "(( '${chr[i]}' )) !=  ${val[i]}"
	fi
	if	[[ $(( L'${chr[i]}' )) != ${val[i]} ]]
	then	err_exit "(( '${chr[i]}' )) !=  ${val[i]}"
	fi
	if	eval '((' "'${chr[i]}'" != ${val[i]} '))'
	then	err_exit "eval (( '${chr[i]}'  !=  ${val[i]} ))"
	fi
	if	eval '((' "'${chr[i]}'" != ${val[i]} ' + $q ))'
	then	err_exit "eval (( '${chr[i]}'  !=  ${val[i]} ))"
	fi
done
unset x
typeset -ui x=4294967293
[[ $x != 4294967293 ]]  && err_exit "unsigned integers not working"
x=32767
x=x+1
[[ $x != 32768 ]]  && err_exit "unsigned integer addition not working"
unset x
float x=99999999999999999999999999
if	(( x < 1e20 ))
then	err_exit 'large integer constants not working'
fi
unset x  y
function foobar
{
	nameref x=$1
	(( x +=1 ))
	print $x
}
x=0 y=4
if	[[ $(foobar y) != 5 ]]
then	err_exit 'name references in arithmetic statements in functions broken'
fi
if	(( 2**3 != pow(2,3) ))
then	err_exit '2**3 not working'
fi
if	(( 2**3*2 != pow(2,3)*2 ))
then	err_exit '2**3*2 not working'
fi
if	(( 4**3**2 != pow(4,pow(3,2)) ))
then	err_exit '4**3**2 not working'
fi
if	(( (4**3)**2 != pow(pow(4,3),2) ))
then	err_exit '(4**3)**2 not working'
fi
if	(( 1**Inf != pow(1,Inf) ))
then	err_exit '1**Inf not working'
fi
if	(( 1**NaN != pow(1,NaN) ))
then	err_exit '1**NaN not working'
fi
typeset -Z3 x=11
typeset -i x
if	(( x != 11 ))
then	err_exit '-Z3 not treated as decimal'
fi
unset x
typeset -ui x=-1
(( x >= 0 )) || err_exit 'unsigned integer not working'
(( $x >= 0 )) || err_exit 'unsigned integer not working as $x'
unset x
typeset -ui42 x=50
if	[[ $x != 42#18 ]]
then	err_exit 'display of unsigned integers in non-decimal bases wrong'
fi
$SHELL -c 'i=0;(( ofiles[i] != -1 && (ofiles[i] < mins || mins == -1) ));exit 0' 2> /dev/null || err_exit 'lexical error with arithmetic expression'
$SHELL -c '(( +1 == 1))' 2> /dev/null || err_exit 'unary + not working'
typeset -E20 val=123.01234567890
[[ $val == 123.0123456789 ]] || err_exit "rounding error val=$val"
if	[[ $(print x$((10))=foo) != x10=foo ]]
then	err_exit 'parsing error with x$((10))=foo'
fi
$SHELL -c 'typeset x$((10))=foo' 2> /dev/null || err_exit 'typeset x$((10)) parse error'
unset x
x=$(( exp(log(2.0)) ))
(( x > 1.999 && x < 2.001 )) || err_exit 'composite functions not working'
unset x y n
typeset -Z8 x=0 y=0
integer n
for	(( n=0; n < 20; n++ ))
do	let "x = $x+1"
	(( y = $y+1 ))
done
(( x == n ))  || err_exit 'let with zero filled fields not working'
(( y == n ))  || err_exit '((...)) with zero filled fields not working'
typeset -RZ3 x=10
[[ $(($x)) == 10 && $((1$x)) == 1010 ]] || err_exit 'zero filled fields not preserving leading zeros'
unset y
[[ $(let y=$x;print $y) == 10 && $(let y=1$x;print $y) == 1010 ]] || err_exit 'zero filled fields not preserving leading zeros with let'
unset i ip ipx
typeset -i hex=( 172 30 18 1)
typeset -ui ip=0 ipx=0
integer i
for	((i=0; i < 4; i++))
do	(( ip =  (ip<<8) | hex[i]))
done
for ((i=0; i < 4; i++))
do	(( ipx = ip % 256 ))
	(( ip /= 256 ))
	(( ipx != hex[3-i] )) && err_exit "hex digit $((3-i)) not correct"
done
unset x
x=010
(( x == 10 )) || err_exit 'leading zeros in x treated as octal arithmetic with ((x))'
(( $x == 10 )) || err_exit 'leading zeros in x treated as octal arithmetic with (($x))'
if	((HAVE_posix))
then	set --posix
	((x == 8)) || err_exit 'posix: leading zeros in x not treated as octal arithmetic with ((x))'
	(($x == 8)) || err_exit 'posix: leading zeros in x not treated as octal arithmetic with (($x))'
	set --noposix
fi
unset x
typeset -Z x=010
(( x == 10 )) || err_exit 'leading zeros not ignored for arithmetic'
(( $x == 10 )) || err_exit 'leading zeros not ignored for arithmetic with $x'
typeset -i i=x
(( i == 10 )) || err_exit 'leading zeros not ignored for arithmetic assignment'
(( ${x:0:1} == 0 )) || err_exit 'leading zero should not be stripped for x:a:b'
c010=3
(( c$x  == 3 )) || err_exit 'leading zero with variable should not be stripped'
[[ $( ($SHELL -c '((++1))' 2>&1) 2>/dev/null ) == *++1:* ]] || err_exit "((++1)) not generating error message"
i=2
(( "22" == 22 )) || err_exit "double quoted constants fail"
(( "2$i" == 22 )) || err_exit "double quoted variables fail"
(( "18+$i+2" == 22 )) || err_exit "double quoted expressions fail"
# 04-04-28 bug fix
unset i; typeset -i i=01-2
(( i == -1 )) || err_exit "01-2 is not -1"

cat > $tmp/script <<-\!
tests=$*
typeset -A blop
function blop.get
{
	.sh.value=777
}
function mkobj
{
	nameref obj=$1
	obj=()
	[[ $tests == *1* ]] && {
		(( obj.foo = 1 ))
		(( obj.bar = 2 ))
		(( obj.baz = obj.foo + obj.bar ))	# ok
		echo $obj
	}
	[[ $tests == *2* ]] && {
		(( obj.faz = faz = obj.foo + obj.bar ))	# ok
		echo $obj
	}
	[[ $tests == *3* ]] && {
		# case 3, 'active' variable involved, w/ intermediate variable
		(( obj.foz = foz = ${blop[1]} ))	# coredump
		echo $obj
	}
	[[ $tests == *4* ]] && {
		# case 4, 'active' variable, in two steps
		(( foz = ${blop[1]} ))	# ok
		(( obj.foz = foz ))		# ok
		echo $obj
	}
	[[ $tests == *5* ]] && {
		# case 5, 'active' variable involved, w/o intermediate variable
		(( obj.fuz = ${blop[1]} ))	# coredump
		echo $obj
	}
	[[ $tests == *6* ]] && {
		echo $(( obj.baz = obj.foo + obj.bar ))	# coredump
	}
	[[ $tests == *7* ]] && {
		echo $(( obj.foo + obj.bar ))	# coredump
	}
}
mkobj bla
!
chmod +x $tmp/script
[[ $($tmp/script 1) != '( bar=2 baz=3 foo=1 )' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
[[ $($tmp/script 2) != '( faz=0 )' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
[[ $($tmp/script 3) != '( foz=777 )' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
[[ $($tmp/script 4) != '( foz=777 )' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
[[ $($tmp/script 5) != '( fuz=777 )' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
[[ $($tmp/script 6) != '0' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
[[ $($tmp/script 7) != '0' ]] 2>/dev/null && err_exit 'compound var arithmetic failed'
unset foo
typeset -F1 foo=123456789.19
[[ $foo == 123456789.2 ]] || err_exit 'typeset -F1 not working correctly'

# divide by zero

for expr in '1/(1/2)' '8%(1/2)' '8%(1.0/2)'
do	[[ $( ( $SHELL -c "( (($expr)) )  || print ok" ) 2>/dev/null ) == ok ]] || err_exit "divide by zero not trapped: $expr"
done

for expr in '1/(1.0/2)' '1/(1/2.0)'
do	[[ $( ( $SHELL -c "( print -r -- \$(($expr)) )" ) 2>/dev/null ) == 2 ]] || err_exit "invalid value for: $expr"
done
[[ $((5||0)) == 1 ]] || err_exit '$((5||0))'" == $((5||0)) should be 1"
$SHELL -c 'integer x=3 y=2; (( (y += x += 2) == 7  && x==5))' 2> /dev/null || err_exit '((y += x += 2)) not working'
$SHELL -c 'b=0; [[ $((b?a=1:b=9)) == 9 ]]' 2> /dev/null || err_exit 'b?a=1:b=9 not working'
unset x
(( x = 4*atan(1.0) ))
[[ $x == "$((x))" ]] || err_exit  '$x !- $((x)) when x is pi'
$SHELL -c  "[[  ${x//./} == {14,100}(\d) ]]" 2> /dev/null || err_exit 'pi has less than 14 significant places'
if	(( Inf+1 == Inf ))
then	set \
		Inf		inf	\
		-Inf		-inf	\
		Nan		nan	\
		1.0/0.0		inf
	((HAVE_signbit)) && set -- "$@" -Nan -nan
	while	(( $# >= 2 ))
	do	x=$(printf "%g\n" $(($1)))
		[[ $x == $2 ]] || err_exit "printf '%g\\n' \$(($1)) failed -- expected $2, got $x"
		x=$(printf "%g\n" $1)
		[[ $x == $2 ]] || err_exit "printf '%g\\n' $1 failed -- expected $2, got $x"
		x=$(printf -- $(($1)))
		[[ $x == $2 ]] || err_exit "print -- \$(($1)) failed -- expected $2, got $x"
		shift 2
	done
	(( 1.0/0.0 == Inf )) || err_exit '1.0/0.0 != Inf'
	[[ $(print -- $((0.0/0.0))) == ?(-)nan ]] || err_exit '0.0/0.0 != NaN'
	(( Inf*Inf == Inf )) || err_exit 'Inf*Inf != Inf'
	(( NaN != NaN )) || err_exit 'NaN == NaN'
	(( -5*Inf == -Inf )) || err_exit '-5*Inf != -Inf'
	[[ $(print -- $((sqrt(-1.0)))) == ?(-)nan ]]|| err_exit 'sqrt(-1.0) != NaN'
	(( pow(1.0,-Inf) == 1.0 )) || err_exit 'pow(1.0,-Inf) != 1.0'
	(( pow(-Inf,0.0) == 1.0 )) || err_exit 'pow(-Inf,0.0) != 1.0'
	(( pow(1.0,Inf) == 1.0 )) || err_exit 'pow(1.0,Inf) != 1.0'
	(( pow(Inf,0.0) == 1.0 )) || err_exit 'pow(Inf,0.0) != 1.0'
	(( pow(1.0,NaN) == 1.0 )) || err_exit 'pow(1.0,NaN) != 1.0'
	(( pow(Nan,0.0) == 1.0 )) || err_exit 'pow(Nan,0.0) != 1.0'
	[[ $(print -- $((NaN/Inf))) == ?(-)nan ]] || err_exit 'NaN/Inf != NaN'
	(( 4.0/Inf == 0.0 )) || err_exit '4.0/Inf != 0.0'
else	err_exit 'Inf and NaN not working'
fi
unset x y n r
n=14.555
float x=$n y
y=$(printf "%a" x)
r=$y
[[ $r == $n ]] || err_exit "output of printf %a not self preserving -- expected $x, got $y"
unset x y r
float x=-0 y=-0.0
r=-0
[[ $((-0)) == 0 ]] || err_exit '$((-0)) should be 0'
[[ $(( -1*0)) == 0 ]] || err_exit '$(( -1*0)) should be 0'
[[ $(( -1.0*0)) == -0 ]] || err_exit '$(( -1.0*0)) should be -0'
[[ $(printf "%g %g %g\n" x $x $((x)) ) == '-0 -0 -0' ]] || err_exit '%g of x $x $((x)) for x=-0 should all be -0'
[[ $(printf "%g %g %g\n" y $x $((y)) ) == '-0 -0 -0' ]] || err_exit '%g of y $y $((y)) for y=-0.0 should all be -0'
$SHELL -c '(( x=));:' 2> /dev/null && err_exit '((x=)) should be an error'
$SHELL -c '(( x+=));:' 2> /dev/null && err_exit '((x+=)) should be an error'
$SHELL -c '(( x=+));:' 2> /dev/null && err_exit '((x=+)) should be an error'
$SHELL -c 'x=();x.arr[0]=(z=3); ((x.arr[0].z=2))' 2> /dev/null || err_exit '(((x.arr[0].z=2)) should not be an error'

float t
typeset a b r
v="-0.0 0.0 +0.0 -1.0 1.0 +1.0"
for a in $v
do	for b in $v
	do	(( r = copysign(a,b) ))
		(( t = copysign(a,b) ))
		[[ $r == $t ]] || err_exit $(printf "float t=copysign(%3.1f,%3.1f) => %3.1f -- expected %3.1f\n" a b t r)
	done
done

typeset -l y y_ascii
(( y=sin(90) )) 
y_ascii=$y 
(( y == y_ascii )) || err_exit "no match,\n\t$(printf "%a\n" y)\n!=\n\t$(printf "%a\n" y_ascii)"

( $SHELL  <<- \EOF
	p=5
	t[p]=6
	while (( t[p] != 0 )) ; do
		((
		p+=1 , 
		t[p]+=2 , 
		p+=3 , 
		t[p]+=5 , 
		p+=1 , 
		t[p]+=2 , 
		p+=1 , 
		t[p]+=1 , 
		p-=6  ,
		t[p]-=1 
		))
	:
	done
EOF) 2> /dev/null ||  err_exit 'error with comma expression'

N=(89551 89557)
i=0 j=1
[[ $(printf "%d" N[j]-N[i]) == 6 ]] || err_exit 'printf %d N[i]-N[j] failed'
[[ $((N[j]-N[i])) == 6 ]] || err_exit  '$((N[j]-N[i])) incorrect'

unset a x
x=0
((a[++x]++))
((x==1)) || err_exit "((a[++x]++)) should only increment x once (expected '1', got '$x')"
((a[1]==1)) || err_exit "a[1] not incremented (expected '1', got '${a[1]}')"
unset a
x=0
((a[x++]++))
((x==1)) || err_exit "((a[x++]++)) should only increment x once (expected '1', got '$x')"
((a[0]==1)) || err_exit "a[0] not incremented (expected '1', got '${a[0]}')"
unset a
x=0
((a[x+=2]+=1))
((x==2)) || err_exit "((a[x+=2]++)) should result in x==2 (expected '2', got '$x')"
((a[2]==1)) || err_exit "a[0] not 1 (expected '1', got '${a[2]}')"

unset a i
typeset -a a
i=1
(( a[i]=1 ))
(( a[0] == 0 )) || err_exit 'a[0] not 0'
(( a[1] == 1 )) || err_exit 'a[1] not 1'

unset a
typeset -i a
for ((i=0;i<1000;i++))
do ((a[RANDOM%2]++))
done
(( (a[0]+a[1])==1000)) || err_exit '(a[0]+a[1])!=1000'

(( 4.**3/10 == 6.4 )) || err_exit '4.**3/10!=6.4'
(( (.5+3)/7 == .5 )) || err_exit '(.5+3)/7!==.5'

function .sh.math.mysin x
{
        ((.sh.value = x - x**3/6. + x**5/120.-x**7/5040. + x**9/362880.))
}

(( abs(sin(.5)-mysin(.5)) < 1e-6 )) || err_exit 'mysin() not close to sin()'

$SHELL 2> /dev/null  <<- \EOF || err_exit "arithmetic functions defined and referenced in compound command not working"
{
	function .sh.math.mysin x
	{
	        ((.sh.value = x-x**3/6. + x**5/120.-x**7/5040. + x**9/362880.))
	}
	(( abs(sin(.5)-mysin(.5)) < 1e-6 )) 
	exit 0
}
EOF



function .sh.math.max x y z
{
	.sh.value=x
	(( y > x )) && .sh.value=y
	(( z > .sh.value )) && .sh.value=z
}
(( max(max(3,8,5),7,5)==8)) || err_exit 'max(max(3,8,5),7,5)!=8'
(( max(max(3,8,5),7,9)==9)) || err_exit 'max(max(3,8,9),7,5)!=9'
(( max(6,max(3,9,5),7)==9 )) || err_exit 'max(6,max(3,8,5),7)!=9'
(( max(6,7, max(3,8,5))==8 )) || err_exit 'max(6,7,max(3,8,5))!=8'

enum color_t=(red green blue yellow)
color_t shirt pants=blue
(( pants == blue )) || err_exit 'pants should be blue'
(( shirt == red )) || err_exit 'pants should be red'
(( shirt != green )) || err_exit 'shirt should not be green'
(( pants != shirt )) || err_exit 'pants should be the same as shirt'
(( pants = yellow ))
(( pants == yellow )) || err_exit 'pants should be yellow'

unset z
integer -a z=( [1]=90 )
function x
{
	nameref nz=$1
	float x y
	float x=$((log10(nz))) y=$((log10($nz)))
	(( abs(x-y) < 1e-10 )) || err_exit '$nz and nz differs in arithmetic expression when nz is reference to array instance'
} 
x z[1]

unset x
float x
x=$( ($SHELL -c 'print -- $(( asinh(acosh(atanh(sin(cos(tan(atan(acos(asin(tanh(cosh(sinh(asinh(acosh(atanh(sin(cos(tan(atan(acos(asin(tanh(cosh(sinh(.5)))))))))))))))))))))))) )) ';:) 2> /dev/null)
(( abs(x-.5) < 1.e-10 )) || err_exit 'bug in composite function evaluation'

unset x
typeset -X x=16
{ (( $x == 16 )) ;} 2> /dev/null || err_exit 'expansions of hexfloat not working in arithmetic expansions'

unset foo
function foobar
{
	(( foo = 8))
}
typeset -i foo
foobar
(( foo == 8 )) || err_exit  'arithmetic assignment binding to the wrong scope'

(( tgamma(4)/12 )) || err_exit 'floating point attribute for functions not preserved'  

unset F
function f
{
 ((F=1))
}
f
[[ $F == 1 ]] || err_exit 'scoping bug with arithmetic expression'

F=1
function f
{
 typeset F
 ((F=2))
}
[[ $F == 1 ]] || err_exit 'scoping bug2 with arithmetic expression'

unset play foo x z
typeset -A play
x=foo
play[$x]=(x=2)
for ((i=0; i < 2; i++))
do	(( play[$x].y , z++  ))
done
(( z==2 )) || err_exit 'unset compound array variable error with for loop optimization'

[[ $($SHELL 2> /dev/null -c 'print -- $(( ldexp(1, 4) ))' ) == 16 ]] || err_exit 'function ldexp not implement or not working correctly'


$SHELL 2> /dev/null -c 'str="0x1.df768ed398ee1e01329a130627ae0000p-1";typeset -l -E x;((x=str))' || err_exit '((x=var)) fails for hexfloat with var beginning with 0x1.nnn'

x=(3 6 12)
(( x[2] /= x[0]))
(( x[2] == 4 ))  || err_exit '(( x[2] /= x[0])) fails for indexed array'

x=([0]=3 [1]=6 [2]=12)
(( x[2] /= x[0]))
(( x[2] == 4 )) || err_exit '(( x[2] /= x[0])) fails for associative array'

got=$($SHELL 2> /dev/null -c 'compound -a x;compound -a x[0].y; integer -a x[0].y[0].z; (( x[0].y[0].z[2]=3 )); typeset -p x')
exp='typeset -C -a x=((typeset -C -a y=( [0]=(typeset -a -l -i z=([2]=3);));))'
[[ $got == "$exp" ]] || err_exit '(( x[0].y[0].z[2]=3 )) not working'

unset x
let x=010
[[ $x == 10 ]] || err_exit 'let treating 010 as octal'
(set -o letoctal; let x=010; [[ $x == 8 ]]) || err_exit 'let not treating 010 as octal with letoctal on'
if	((HAVE_posix))
then	(set -o posix; let x=010; [[ $x == 8 ]]) || err_exit 'let not treating 010 as octal with posix on'
fi

unset A
float z=0
integer aa=2 a=1
typeset -A A
A[a]=(typeset -A AA)
A[a].AA[aa]=1
(( z= A[a].AA[aa]++ ))
(( z == 1 )) ||  err_exit "z should be '1' but is '$z' for associative array of associative array arithmetic"
[[ ${A[a].AA[aa]} == 2 ]] || err_exit "\${A[a].AA[aa]} should be '2' but is '${A[a].AA[aa]}'" \
	'after ++ operation for associative array of associative array arithmetic'
unset A[a]

A[a]=(typeset -a AA)
A[a].AA[aa]=1
(( z += A[a].AA[aa++]++ ))
(( z == 2 )) ||  err_exit "z should be '2' but is '$z' for associative array of indexed array arithmetic"
(( aa == 3 )) || err_exit "subscript aa should be '3' but is '$aa' after ++"
[[ ${A[a].AA[aa-1]} == 2 ]] || err_exit "\${A[a].AA[aa]} should be '2' but is '${A[a].AA[aa]}'" \
	'after ++ operation for associative array of indexed array arithmetic'
unset A

typeset -a A
A[a]=(typeset -A AA)
A[a].AA[aa]=1
(( z += A[a].AA[aa]++ ))
(( z == 3 )) ||  err_exit "z should be '3' but is '$z' for indexed array of associative array arithmetic"
[[ ${A[a].AA[aa]} == 2 ]] || err_exit "\${A[a].AA[aa]} should be '2' but is '${A[a].AA[aa]}'" \
	'after ++ operation for indexed array of associative array arithmetic'
unset A[a]

A[a]=(typeset -a AA)
A[a].AA[aa]=1
(( z += A[a++].AA[aa++]++ ))
(( z == 4 )) ||  err_exit "z should be '4' but is '$z' for indexed array of indexed array arithmetic"
[[ ${A[a-1].AA[aa-1]} == 2 ]] || err_exit "\${A[a].AA[aa]} should be '2' but is '${A[a].AA[aa]}'" \
	'after ++ operation for indexed array of indexed array arithmetic'
(( aa == 4 )) || err_exit "subscript aa should be '4' but is '$aa' after ++"
(( a == 2 )) || err_exit "subscript a should be '2' but is '$a' after ++"
unset A

unset r x
integer x
r=020
(($r == 20)) || err_exit 'leading 0 treated as octal inside ((...))'
x=$(($r))
((x == 20)) || err_exit 'leading 0 treated as octal inside $((...))'
x=$r
((x == 20)) || err_exit 'leading 0 treated as octal outside ((...))'
print -- -020 | read x
((x == -20)) || err_exit 'numbers with leading -0 treated as octal outside ((...))'
print -- -8#20 | read x
((x == -16)) || err_exit 'numbers with leading -8# should be treated as octal'
if	((HAVE_posix))
then	set --posix
	(($r == 16)) || err_exit 'posix: leading 0 not treated as octal inside ((...))'
	x=$(($r))
	(( x == 16 )) || err_exit 'posix: leading 0 not treated as octal inside $((...))'
	x=$r
	((x == 16)) || err_exit 'posix: leading 0 not as octal outside ((...))'
	print -- -020 | read x
	((x == -16)) || err_exit 'posix: numbers with leading -0 should be treated as octal outside ((...))'
	set --noposix
fi

unset x
x=0x1
let "$x==1" || err_exit 'hex constants not working with let'
(( $x == 1 )) || err_exit 'arithmetic with $x, where $x is hex constant not working'
for i in 1
do	(($x == 1)) || err_exit 'arithmetic in for loop with $x, where $x is hex constant not working'
done
x=010
let "$x==10" || err_exit 'arithmetic with $x where $x is 010 should be decimal in let'
(( 9.$x == 9.01 )) || err_exit 'arithmetic with 9.$x where x=010 should be 9.01' 
(( 9$x == 9010 )) || err_exit 'arithmetic with 9$x where x=010 should be 9010' 
x010=99
((x$x == 99 )) || err_exit 'arithmetic with x$x where x=010 should be $x010'
(( 3+$x == 13 )) || err_exit '3+$x where x=010 should be 13 in ((...))'
if	((HAVE_posix))
then	set --posix
	(( 3+$x == 11 )) || err_exit 'posix: 3+$x where x=010 should be 11 in ((...))'
	set --noposix
fi
let "(3+$x)==13" || err_exit 'let should not recognize leading 0 as octal'
unset x
typeset -RZ3 x=10 
(( $x == 10 )) || err_exit 'leading 0 in -RZ should not create octal constant with ((...))'
let "$x==10" || err_exit 'leading 0 in -RZ should not create octal constant with let'

unset v x
x=0x1.0000000000000000000000000000p+6
v=$(printf $'%.28a\n' 64)
[[ $v == "$x" ]] || err_exit "'printf %.28a 64' failed -- expected '$x', got '$v'"

# ======
# Redirections with ((...)) should not cause a syntax error
(eval '((1)) >/dev/null') 2>/dev/null || err_exit 'redirections with ((...)) yield a syntax error'

# ======
# Arbitrary command execution vulnerability in array subscripts in arithmetic expressions
# https://github.com/ksh93/ksh/issues/152
unset a

exp='array_test_1: 1$(echo INJECTION >&2): arithmetic syntax error'
got=$(set +x; var='1$(echo INJECTION >&2)' "$SHELL" -c 'typeset -a a; ((a[$var]++)); typeset -p a' array_test_1 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 1A: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; var='1$(echo INJECTION >&2)' "$SHELL" -c 'typeset -a a; ((a["$var"]++)); typeset -p a' array_test_1 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 1B: expected $(printf %q "$exp"), got $(printf %q "$got")"

exp='typeset -A a=(['\''1$(echo INJECTION >&2)'\'']=1)'
got=$(set +x; { var='1$(echo INJECTION >&2)'; typeset -A a; ((a[$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 2A: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='1$(echo INJECTION >&2)'; typeset -A a; ((a["$var"]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 2B: expected $(printf %q "$exp"), got $(printf %q "$got")"

exp='typeset -A a=(['\''$0`echo INJECTION >&2`'\'']=1)'
got=$(set +x; { var='$0`echo INJECTION >&2`'; typeset -A a; ((a[$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 3A: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='$0`echo INJECTION >&2`'; typeset -A a; ((a["$var"]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 3B: expected $(printf %q "$exp"), got $(printf %q "$got")"

exp='typeset -A a=(['\''x\]+b\[$(echo INJECTION >&2)'\'']=1)'
got=$(set +x; { var="x\]+b\[\$(echo INJECTION >&2)"; typeset -A a; ((a[$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 4A: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var="x\]+b\[\$(echo INJECTION >&2)"; typeset -A a; ((a["$var"]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 4B: expected $(printf %q "$exp"), got $(printf %q "$got")"

exp='typeset -A a=(['\''$var'\'']=1)'
got=$(set +x; { var='$0$(echo INJECTION >&2)'; typeset -A a; ((a[\$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5A: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='1`echo INJECTION >&2`'; typeset -A a; ((a["\$var"]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5B: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var=''; typeset -A a; ((a[\$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5C: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='\'; typeset -A a; ((a[\$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5D: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var=']'; typeset -A a; ((a[\$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5E: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='x]foo'; typeset -A a; ((a[\$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5F: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var=''; typeset -A a; let 'a[$var]++'; typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5G: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='\'; typeset -A a; let 'a[$var]++'; typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5H: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var=']'; typeset -A a; let 'a[$var]++'; typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5I: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='x]foo'; typeset -A a; let 'a[$var]++'; typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5J: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var='1$(echo INJECTION >&2)'; typeset -A a; ((a["\$var"]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5K: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var="x\]+b\[\$(echo INJECTION >&2)"; typeset -A a; ((a[\$var]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5L: expected $(printf %q "$exp"), got $(printf %q "$got")"
got=$(set +x; { var="x\]+b\[\$(uname>&2)"; typeset -A a; ((a["\$var"]++)); typeset -p a; } 2>&1)
[[ $got == "$exp" ]] || err_exit "Array subscript quoting test 5M: expected $(printf %q "$exp"), got $(printf %q "$got")"

# ======
# Arithmetic recursion level was not reset on encountering readonly error in combination with a recursive arithmetic expression.
# (arithmetic array subscripts inside arithmetic expressions are one example of such recursion)
# https://github.com/ksh93/ksh/pull/239#discussion_r606874442
srcdir=${SHTESTS_COMMON%/tests/*}
integer maxlevel=$(grep $'^#define MAXLEVEL\t' "$srcdir/sh/streval.c" | sed 's/.*MAXLEVEL//')
if	((!maxlevel))
then	err_exit "could not get maximum arithmetic recursion level from source code; update this test"
	maxlevel=1024
fi
integer loopcount=maxlevel+10
got=$(
	typeset -r -A -i ro_arr=([a]=10 [b]=20 [c]=30)
	set +x
	for ((i=0; i<loopcount; i++)); do
		let "ro_arr[i+1] += 5"
	done 2>&1
)
[[ $got == *recursion* ]] && err_exit "recursion level not reset on readonly error (main shell)"
got=$(
	typeset -r -A -i ro_arr=([a]=10 [b]=20 [c]=30)
	set +x
	for ((i=0; i<loopcount; i++)); do
		( ((ro_arr[i+1] += 5)) )
	done 2>&1
)
[[ $got == *recursion* ]] && err_exit "recursion level not reset on readonly error (subshell)"

# ======
# Some math function tests and only error if function exits
unset got
got=0
if ( (( exp10(3) )) ) 2> /dev/null
then
	(( (got=exp10(3)) == 1000 )) ||  err_exit "exp10(3) != 1000, got '$got'"
fi
got=0
if ( (( int(6.89) )) ) 2> /dev/null
then
	(( (got=int(6.89)) == 6 )) ||  err_exit "int(6.89) != 6, got '$got'"
fi
got=0
if ( (( int(-6.89) )) ) 2> /dev/null
then
	(( (got=int(-6.89)) == -6 )) ||  err_exit "int(-6.89) != -6, got '$got'"
fi
float got=-1
if ( (( float(2./3) )) ) 2> /dev/null
then
	(( (got=float(2./3)) == 2./3 )) ||  err_exit "float(2./3) != 2./3, got '$got'"
fi
unset got

# ======
# https://github.com/ksh93/ksh/issues/326
((HAVE_posix)) && for m in u d i o x X
do
	set --posix
	case $m in
	o)	exp="10;21;32;" ;;
	x)	exp="8;11;1a;" ;;
	X)	exp="8;11;1A;" ;;
	*)	exp="8;17;26;" ;;
	esac
	got=${ printf "%$m;" 010 021 032; }
	[[ $got == "$exp" ]] || err_exit "posix: printf %$m does not recognize octal arguments" \
		"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
	set --noposix
done

# ======
# BUG_ARITHNAN: In ksh <= 93u+m 2021-11-15 and zsh 5.6 - 5.8, the case-insensitive
# floating point constants Inf and NaN are recognised in arithmetic evaluation,
# overriding any variables with the names Inf, NaN, INF, nan, etc.
if	((HAVE_posix))
then	set --posix
	Inf=42 NaN=13
	inf=421 nan=137
	INF=429 NAN=937
	typeset -l v=$((Inf)),$((NaN)),$((inf)),$((nan)),$((INF)),$((NAN))
	case $v in
	( inf,nan,inf,nan,inf,nan )
		err_exit "posix: arith: inf/nan override variables" ;;
	( "$Inf,$NaN,$inf,$nan,$INF,$NAN" )
		: mustNotHave BUG_ARITHNAN ;;
	( * )
		err_exit "posix: arith: weird inf/nan problem: $(printf %q "$v")" ;;
	esac
	unset -v Inf NaN inf nan INF NAN v
	set --noposix
fi

# ======
# https://github.com/ksh93/ksh/issues/334#issuecomment-968603087
exp=21
got=$(typeset -Z x=0x15; set +x; { echo $((x)); } 2>&1)
[[ $got == "$exp" ]] || err_exit "typeset -Z corrupts hexadecimal number in arithmetic context" \
	"(expected $(printf %q "$exp"), got $(printf %q "$got"))"

# ======
# Test for 'set -u' backported from ksh93v- 2013-09-26
unset IFS i
set -u
float -a ar
function f
{
	integer i=0 ar_i=0
	for	(( i=0 ; i < 3 ; i++ ))
	do	(( ar[ar_i++]=i))
	done
	printf "%q\n" "${ar[*]}"
}
[[ $(f) == "'0 1 2'" ]] || err_exit '0 value for variable in arithmetic expression inside function with set -u fails'
set +u

# Test for unset x.NOT_KNOWN floating point variable (backported
# from ksh93v- 2013-09-13).
unset x
float x
((x.NOT_KNOWN == 0)) || err_exit 'x.NOT_KNOWN is unknown and should have value 0'

# Test for a bug with short integers that causes core dumps
# (backported from ksh93v- 2013-08-07).
"$SHELL" <<- \EOF || err_exit 'detected short integer bug that causes core dumps'
       typeset -s -i -a t
       typeset -s -i p
       (( p=2**17 )) # tape start position
       (( t[p]+=13))
       while (( t[p] != 0 ))
       do      ((t[p]-=1 , p+=1))
       done
       exit 0
EOF

# ======
got=$(set +x; eval ': $((1 << 2))' 2>&1) \
|| err_exit "bitwise left shift operator fails to parse (got $(printf %q "$got"))"
got=$(set +x; eval 'got=$( ((y=1<<4)); echo $y )' 2>&1; echo $got) \
|| err_exit "bitwise left shift operator fails to parse in comsub (got $(printf %q "$got"))"

# ======
# https://github.com/ksh93/ksh/issues/623
function .sh.math.add x y { .sh.value=x+y; }
got=$(PATH=/dev/null; typeset -i z; set +x; redirect 2>&1; z='add(2 , 3)'; echo $z)
[[ e=$? -eq 0 && $got == '5' ]] || err_exit ".sh.math.* function parsing: got status $e and $(printf %q "$got")"

# ======
# arithmetic assignments should not trigger getn disciplines, but the return
# value should still be cast to the type of the variable that is assigned to

(
	ulimit -c 0  # fork
	Errors=0
	# <<< outdent
float x
x.getn() { .sh.value=987.65; }
let "got = x = 1234.56"
[[ $got == 1234.56* ]] || err_exit "arithmetic assignment triggers getn discipline (got $got)"
[[ $x == 987.65* ]] || err_exit "arithmetic comparison fails to trigger getn discipline (got $x)"
unset x
whence -q x.getn && err_exit "unset x fails to unset -f x.getn"
	# >>> indent
	exit $Errors
)
if	let "(e = $?) > 128"
then	err_exit "getn discipline crashed the shell (got status $e/SIG$(kill -l "$e"))"
else	let "Errors += e"
fi

(
	ulimit -c 0  # fork
	Errors=0
	for sz in '' s l
	do	typeset -${sz}i x=0
		if	! let "(got = x = 123.95) == 123"
		then	err_exit "arithmetic assignment does not return properly typecast value (-${sz}i, got $got)"
		fi
		typeset -${sz}F x=0
		let "got = x = 123.95"
		if	[[ $got != 123.95* ]]  # ignore OS-dependent rounding error
		then	err_exit "arithmetic assignment does not return properly typecast value (-${sz}F, got $got)"
		fi
	done
	exit $Errors
)
if	let "(e = $?) > 128"
then	err_exit "typeset crashed the shell (got status $e/SIG$(kill -l "$e"))"
else	let "Errors += e"
fi

if	! let "(got = RANDOM = 123.95) == 123"
then	err_exit "arithmetic assignment to RANDOM does not return typecast of assigned value (got $got)"
fi

let "_ = 123.95, got = _"
if	[[ $got != '123.95' ]]
then	err_exit "arithmetic assignment to _ fails (got $got)"
fi

got=$(let "LINENO = 123"; print $LINENO )
if	[[ $got != '122' ]]   # TODO: should be 123
then	err_exit "arithmetic assignment to LINENO fails (got $got)"
fi

# ======
# non-base-10 numbers may be negative
# https://github.com/ksh93/ksh/issues/696
exp=-20#j12
integer 20 got=$exp
[[ $got == "$exp" ]] || err_exit "negative base-20 number (expected '$exp', got '$got')"
unset got

# ======
exp=': arithmetic syntax error'
# when leading 0 is recognised as octal, invalid octal should be an error
for v in 08 028 089 09 029 098 012345678
do	got=$(set --letoctal; let "$v" 2>&1)
	[[ e=$? -eq 1 && $got == *"$exp" ]] || err_exit "invalid leading-zero octal number $v not an error" \
		"(expected status 1 and match of *'$exp', got status $e and '$got')"
done
# only a single 0 should precede x or X for it to be a hexadecimal number
got=$(eval ': $((00xF))' 2>&1)
[[ e=$? -eq 1 && $got == *"$exp" ]] || err_exit "extra zero before 0x not an error (expansion)" \
	"(expected status 1 and match of *'$exp', got status $e and '$got')"
got=$(let '00xF' 2>&1)
[[ e=$? -eq 1 && $got == *"$exp" ]] || err_exit "extra zero before 0x not an error (let)" \
	"(expected status 1 and match of *'$exp', got status $e and '$got')"
# ksh base specifiers (like 16# for hexadecimal) may not have leading zeros
got=$(eval ': $((016#F))' 2>&1)
[[ e=$? -eq 1 && $got == *"$exp" ]] || err_exit "leading zero before 16# not an error (expansion)" \
	"(expected status 1 and match of *'$exp', got status $e and '$got')"
got=$(let '016#F' 2>&1)
[[ e=$? -eq 1 && $got == *"$exp" ]] || err_exit "leading zero before 16# not an error (let)" \
	"(expected status 1 and match of *'$exp', got status $e and '$got')"

# ======
# Lexer tests. Unmatched `((' crashed ksh or caused incorrect behaviour until 2024-07-20.
# https://github.com/ksh93/ksh/issues/764
exp=": \`(' unmatched"
got=$( ( ulimit -c 0; set +x; eval '{ (( $(( 1 )); }' ) 2>&1 )
[[ e=$? -eq 3 && $got == *"$exp" ]] || err_exit "unmatched '((', test 1" \
	"(expected status 1 and match of *$(printf %q "$exp")," \
	"got status $e$( ((e>128)) && print -n /SIG && kill -l "$e") and $(printf %q "$got"))"
got=$( ( ulimit -c 0; set +x; eval 'x=$(( }; echo end' ) 2>&1 )
[[ e=$? -eq 3 && $got == *"$exp" ]] || err_exit "unmatched '((', test 2" \
	"(expected status 1 and match of *$(printf %q "$exp")," \
	"got status $e$( ((e>128)) && print -n /SIG && kill -l "$e") and $(printf %q "$got"))"
got=$( ( ulimit -c 0; set +x; eval '{ x=$(( }; echo end; }' ) 2>&1 )
[[ e=$? -eq 3 && $got == *"$exp" ]] || err_exit "unmatched '((', test 3" \
	"(expected status 1 and match of *$(printf %q "$exp")," \
	"got status $e$( ((e>128)) && print -n /SIG && kill -l "$e") and $(printf %q "$got"))"
got=$( ( ulimit -c 0; set +x; eval '(( }; echo end' ) 2>&1 )
[[ e=$? -eq 3 && $got == *"$exp" ]] || err_exit "unmatched '((', test 4" \
	"(expected status 1 and match of *$(printf %q "$exp")," \
	"got status $e$( ((e>128)) && print -n /SIG && kill -l "$e") and $(printf %q "$got"))"
got=$( ( ulimit -c 0; set +x; eval '{ (( }; echo end; }' ) 2>&1 )
[[ e=$? -eq 3 && $got == *"$exp" ]] || err_exit "unmatched '((', test 5" \
	"(expected status 1 and match of *$(printf %q "$exp")," \
	"got status $e$( ((e>128)) && print -n /SIG && kill -l "$e") and $(printf %q "$got"))"

got=$( ( ulimit -c 0; set +x; eval '{ (( $(( 1 )) )); }' ) 2>&1 )
[[ e=$? -eq 0 && -z $got ]] || err_exit "matched '((' in compound command" \
	"(expected status 0 and ''," \
	"got status $e$( ((e>128)) && print -n /SIG && kill -l "$e") and $(printf %q "$got"))"

# ======
# On ARM systems, division by negative threw an incorrect "divide by zero" error!
# https://github.com/ksh93/ksh/issues/770
got=$(let "10 / -10 == -1 && 10 / -1 == -10 && 10 / -2 == -5" 2>&1) || err_exit "division by negative (got $(printf %q "$got"))"
# Also, from 2024-01-21 to 2024-07-24, the return value of assigning negative to unsigned int was 0 on ARM
if	! exp=$(PATH=/opt/ast/bin:$PATH; getconf UINT_MAX 2>/dev/null)
then	warning "getconf UINT_MAX failed; skipping issue 770 test"
else	typeset -ui i
	got=$((i = -1))
	[[ $i == "$exp" ]] || err_exit "unsigned int wrap-around of -1 (expected '$exp', got '$i')"
	[[ $got == "$exp" ]] || err_exit "return value of assigning -1 to unsigned int (expected '$exp', got '$got')"
	unset i
fi

# ======
exit $((Errors<125?Errors:125))
