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Correct regression for compound arithmetic expressions (re: 642a1053) (#297)

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I did not realize that lvalue->nosub and lvalue->sub variables are
not reset when another assignment occurs later down the line.
Example: (( arr[0][1]+=1, arr[2]=7 ))

src/cmd/ksh93/sh/arith.c: arith():
- For assignment operations, reset lvalue's nosub and sub variables
  so the target for the next assignment is not redirected.

src/cmd/ksh93/tests/arrays2.sh:
- Add in a few regression tests that utilize compound arithmetic
  expressions having at least an assignment operation (+=) followed
  by a normal assignment (=).
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hyenias 2021-05-04 22:29:19 -04:00 • committed by GitHub
parent a197b0427a
commit 655c4be1c1
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2 changed files with 7 additions and 1 deletions
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5
src/cmd/ksh93/sh/arith.c
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@ -234,10 +234,13 @@ static Sfdouble_t arith(const char **ptr, struct lval *lvalue, int type, Sfdoubl
case ASSIGN:
{
register Namval_t *np;
if (lvalue->nosub > 0 && lvalue->sub) /* indexed array ARITH_ASSIGNOP */
if (lvalue->sub && lvalue->nosub > 0) /* indexed array ARITH_ASSIGNOP */
{
np = (Namval_t*)lvalue->sub; /* use saved subscript reference instead of last worked value */
nv_putsub(np, NIL(char*), lvalue->nosub-1);
/* reset nosub and sub for next assignment in a compound arithmetic expression */
lvalue->nosub = 0;
lvalue->sub = 0;
}
else
{