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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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20
shell/ash_test/ash-arith/arith.right
View File

@ -97,6 +97,7 @@ ghi
3 3
4 4
4 4
7 7
./arith.tests: line 257: arithmetic syntax error
./arith.tests: line 259: arithmetic syntax error
./arith.tests: line 260: arithmetic syntax error
@ -105,6 +106,8 @@ ghi
4 4
7 7
-7 -7
7
7
./arith1.sub: line 2: arithmetic syntax error
./arith1.sub: line 3: arithmetic syntax error
./arith1.sub: line 4: arithmetic syntax error
@ -119,11 +122,12 @@ ghi
2 2
-2 -2
1 1
./arith1.sub: line 37: arithmetic syntax error
./arith2.sub: line 2: arithmetic syntax error
./arith2.sub: line 3: arithmetic syntax error
./arith2.sub: line 4: arithmetic syntax error
./arith2.sub: line 5: arithmetic syntax error
7
7
7
7
7
7
5 5
1 1
6 6
@ -132,8 +136,10 @@ ghi
1 1
4 4
0 0
./arith2.sub: line 42: arithmetic syntax error
./arith2.sub: line 47: arithmetic syntax error
-7
-7
7
7
8 12
./arith.tests: line 290: arithmetic syntax error
42

10
shell/ash_test/ash-arith/arith.tests
View File

@ -252,8 +252,8 @@ echo 3 $x
echo 4 $(( ++x ))
echo 4 $x
# bash 3.2 apparently thinks that ++7 is 7
#ash# echo 7 $(( ++7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo 7 $(( ++7 ))
( echo $(( 7-- )) )
( echo $(( --x=7 )) )
@ -267,9 +267,9 @@ echo 4 $x
echo 7 $(( +7 ))
echo -7 $(( -7 ))
# bash 3.2 apparently thinks that ++7 is 7
#ash# echo $(( ++7 ))
#ash# echo $(( --7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo $(( ++7 ))
echo $(( --7 ))
${THIS_SH} ./arith1.sub
${THIS_SH} ./arith2.sub

4
shell/ash_test/ash-arith/arith1.sub
View File

@ -35,6 +35,6 @@ echo 1 $a
#ash# (( ++ ))
( echo $(( +++7 )) )
# bash 3.2 apparently thinks that ++ +7 is 7
#ash# echo $(( ++ + 7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo $(( ++ + 7 ))
#ash# (( -- ))

10
shell/ash_test/ash-arith/arith2.sub
View File

@ -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

20
shell/hush_test/hush-arith/arith.right
View File

@ -106,6 +106,7 @@ hush: arithmetic syntax error
3 3
4 4
4 4
7 7
hush: arithmetic syntax error
hush: arithmetic syntax error
hush: arithmetic syntax error
@ -114,6 +115,8 @@ hush: arithmetic syntax error
4 4
7 7
-7 -7
7
7
hush: arithmetic syntax error
hush: arithmetic syntax error
hush: arithmetic syntax error
@ -128,11 +131,12 @@ hush: arithmetic syntax error
2 2
-2 -2
1 1
hush: arithmetic syntax error
hush: arithmetic syntax error
hush: arithmetic syntax error
hush: arithmetic syntax error
hush: arithmetic syntax error
7
7
7
7
7
7
5 5
1 1
6 6
@ -141,8 +145,10 @@ hush: arithmetic syntax error
1 1
4 4
0 0
hush: arithmetic syntax error
hush: arithmetic syntax error
-7
-7
7
7
8 12
hush: arithmetic syntax error
42

10
shell/hush_test/hush-arith/arith.tests
View File

@ -255,8 +255,8 @@ echo 3 $x
echo 4 $(( ++x ))
echo 4 $x
# bash 3.2 apparently thinks that ++7 is 7
#ash# echo 7 $(( ++7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo 7 $(( ++7 ))
( echo $(( 7-- )) )
( echo $(( --x=7 )) )
@ -270,9 +270,9 @@ echo 4 $x
echo 7 $(( +7 ))
echo -7 $(( -7 ))
# bash 3.2 apparently thinks that ++7 is 7
#ash# echo $(( ++7 ))
#ash# echo $(( --7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo $(( ++7 ))
echo $(( --7 ))
${THIS_SH} ./arith1.sub
${THIS_SH} ./arith2.sub

4
shell/hush_test/hush-arith/arith1.sub
View File

@ -35,6 +35,6 @@ echo 1 $a
#ash# (( ++ ))
( echo $(( +++7 )) )
# bash 3.2 apparently thinks that ++ +7 is 7
#ash# echo $(( ++ + 7 ))
# ++ is not a inc operator on non-variable, it is the + + sequence
echo $(( ++ + 7 ))
#ash# (( -- ))

10
shell/hush_test/hush-arith/arith2.sub
View File

@ -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

23
shell/math.c
View File

@ -668,19 +668,26 @@ evaluate_string(arith_state_t *math_state, const char *expr)
/* Should be an operator */
/* Special case: NUM-- and NUM++ are not recognized if NUM
* is a literal number, not a variable. IOW:
/* Special case: XYZ--, XYZ++, --XYZ, ++XYZ are recognized
* only if XYZ is a variable name, not a number or EXPR. IOW:
* "a+++v" is a++ + v.
* "7+++v" is 7 + ++v, not 7++ + v.
* "--7" is - - 7, not --7.
* "++++a" is + + ++a, not ++ ++ a.
* (we still mishandle "(a)+++7", should be treated as (a) + + + 7, but we do increment a)
*/
if (lasttok == TOK_NUM && !numstackptr[-1].var /* number literal */
&& (expr[0] == '+' || expr[0] == '-')
if ((expr[0] == '+' || expr[0] == '-')
&& (expr[1] == expr[0])
) {
//bb_error_msg("special %c%c", expr[0], expr[0]);
op = (expr[0] == '+' ? TOK_ADD : TOK_SUB);
expr += 1;
goto tok_found1;
if (numstackptr == numstack || !numstackptr[-1].var) { /* not a VAR++ */
char next = skip_whitespace(expr + 2)[0];
if (!(isalpha(next) || next == '_')) { /* not a ++VAR */
//bb_error_msg("special %c%c", expr[0], expr[0]);
op = (expr[0] == '+' ? TOK_ADD : TOK_SUB);
expr++;
goto tok_found1;
}
}
}
p = op_tokens;