[PATCH]: allow $(())

[Vladimir N. Oleynik]

Hello.

My micro patch for allow $(( )) as 0

--- arith_yacc.orig.c   2020-12-23 11:58:12.000000000 +0400
+++ arith_yacc.c        2021-01-29 23:47:01.854997852 +0400
@@ -292,10 +292,17 @@
 intmax_t arith(const char *s)
 {
        intmax_t result;
+       int l0;

        arith_buf = arith_startbuf = s;

-       result = assignment(yylex(), 0);
+       l0 = yylex();
+       if (l0 == 0) {
+               /* $(( )) */
+               yylval.val = 0;
+               l0 = ARITH_NUM;
+       }
+       result = assignment(l0, 0);

        if (last_token)
                yyerror("expecting EOF");


--w
vodz