Calling two times yyparse reloading yyin

[Ismael Moreno]

Hi all,
I'm including a parser in Bison for a C++ project (a flow chart
interpreter), but it brings me a lot of odd problems.
The translation of a assigment node ( a assigment instruction) first parses
the rvalue and, then, lvalue.
RValue and LValue are strings, so yyin is loaded by fmemopen. The piece of
code is:

//Assigment node translation
void cAssigNode::translate(cVM& vm)  throw(std::exception)
{
    char* Text;
    Text = strdup(RValue.c_str());

    FILE* yyin = fmemopen(Text, strlen(Text), "r");
    if(yyin == NULL)
        throw(cError("Can't open yyin stream"));

    yyparse();

    sMemReg Instr;
    Instr.Func = push_ax;
    vm.putMemoryCell(Instr);

    fclose(yyin);
    delete Text;

    Text = strdup(LValue.c_str());

    yyin = fmemopen(Text, strlen(Text), "r");
    if(yyin == NULL)
        throw(cError("Can't open yyin stream"));

    IsDefiningVar = true;
    MustReturnDir = true;
    yyparse();
    MustReturnDir = false;
    IsDefiningVar = false;

    Instr.Func = pop_bx;
    vm.putMemoryCell(Instr);
    Instr.Op1.setAddress(VM.getMemorySize() + 1);
    Instr.Func = mov_op2_bx;
    vm.putMemoryCell(Instr);
    Instr.Op1.setAddress(VM.getMemorySize());
    Instr.Func = mov_op1_ax;
    vm.putMemoryCell(Instr);
    Instr.Func = mov_mem_dat;
    vm.putMemoryCell(Instr);

    fclose(yyin);
    delete Text;

}

vm is an instance of a virtual machine and Instr a instruction to insert on
it.

The first yyparse call works fine (as far as i know, because i haven't been
able to test the assigment operation), so the problem is in the last call.
yywrap is defined via the linker option -lfl.

Note that I've read previous mails about a simmilar problem, where the
solution was to use yyrestart(yyin). The difference now is that yyin is
cleaned and reloaded, so i think it is not needed to call it.

Thanks in advance, and sorry for my rude english.