How to build an Array with Bison/Yacc and a Recursive Rule

Question

With Bison, I figured out how to get everything into one long string as follows:

arg_list:
    WORD arg_list { strcat( $1, \"IFS\" ); $$ = strcat($1, $2); }          


        

Answer 1

%union {
  char *char_ptr;
}
%token STRING
%type  STRING string
%%
...
string:
    STRING        /* Lexic analyzer return STRING and set yylval = yytext; */
  | string STRING
    { char *str = (char*) malloc(strlen($1) + strlen($2) + 1);
      strcpy(str, $1);
      strcat(str, $2);
      free($2);
      free($1);
      $$ = str;
    }
  ;
%%