[prog] Yacc - double errors

[Sue Stones]

I am back to my Yacc program after an enforced break (uni presures).
I ahve been trying to sort out error reporting but i have rewrtiten it 
multitple times, but I still getting double errors.

I will just include a sample of the code, and hope that someone can give me 
some clues as to what might be wrong. If I really need to send the whole 
program I will!

---------------------------------------
end_statement:  END SEMI { fprintf(stdout, "end;\n"); }
        |       END  error      {
                        errorstr = strdup("Missing semicolon after \"end\"");
                        yyerror(errorstr); }
        ;


---------------------------------------


void yyerror(const char *str)
{
        errors_found++;
        fprintf(stderr,"%s:%d: %s \n", filename, lineno, str);
} // yyerror

----------------------------------------

main(int argc, char *argv[])
{
        if(argc > 1)
        {
                yyin = fopen(argv[1], "r");
                filename = strdup(argv[1]);
                yyparse();
                if (errors_found > 0)
                        fprintf(stderr, "%d errors\n", errors_found);
                else
                        fprintf(stderr, "Program Parsed\n");
        } // if
        else
        {
                fprintf(stderr, "usage: %s filename.b\n", argv[0]);
                return 0;
        } // else
} // main
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