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shell: fix arithmentic evaluation of "++7" and such (it is + + 7, i.e. 7)

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function                                             old     new   delta
evaluate_string                                      945     988     +43

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-09-25 22:04:45 +02:00
parent 627821e42b
commit d84a604830
9 changed files with 65 additions and 46 deletions
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10
shell/ash_test/ash-arith/arith2.sub
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@@ -1,4 +1,4 @@
# bash 3.2 apparently thinks that ++7 is 7 etc
# ++ and -- are not inc/dec operators on non-variables, they are + + and - - sequences
( echo $(( --7 )) )
( echo $(( ++7 )) )
( echo $(( -- 7 )) )
@@ -37,13 +37,13 @@ echo 4 $(( 4 - -- a ))
echo 0 $a
#ash# (( -- ))
# bash 3.2 apparently thinks that ---7 is -7
#ash# echo $(( ---7 ))
# -- is not a dec operator on non-variable, it is the - - sequence
echo $(( ---7 ))
( echo $(( -- - 7 )) )
#ash# (( ++ ))
# bash 3.2: 7
#ash# echo 7 $(( ++7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo $(( ++7 ))
( echo $(( ++ + 7 )) )
# bash 3.2: -7