: allow $(())

Commit Message

Vladimir N. Oleynik Jan. 29, 2021, 7:49 p.m. UTC

Hello.

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



--w
vodz

Comments

Herbert Xu April 5, 2024, 8:36 a.m. UTC | #1

On Fri, Jan 29, 2021 at 11:49:20PM +0400, Vladimir N. Oleynik wrote:
> 
> My micro patch for allow $(( )) as 0

Thanks but we don't add features that are not required by POSIX.

Patch

--- 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");