[avr-gcc-list] stdio is only partially functional

[Sander Pool]

Hello,

I am finally enabling stdio on my mega128 project. I'm seeing some odd
behavior I hope you can help with. Somehow I can output individual
characters just fine but strings get clobbered.

When I do a sequence of calls like this:

        fprintf(stdout, "fprintf\n");
        fprintf_P(stdout, "fprintf_P\n");
        fputs("fputs\n", stdout);
        fputs_P("fputs_P\n", stdout);
        fputc('X', stdout);
        RL_USART_Putc1('Y');
        RL_USART_Putc1('\n');

I get:

fS??.?d??'T
A0"Q
 "P
?a?"T
?.?{??S.?lS??.?h??Y'?'?'/'????.''?'$/
"?"O"
_"o"?"Y" '^f "P
?a?"T
?.?{??S.?lS??.?h??Y'?'?'/'????.''?'$/"?"O"_"o
"?"Y
" '^XY

on my terminal. X, Y and \n are transmitted fine but the string prints
aren't even the right number of characters. I'm probably doing something
silly, I hope you can help me identify it. I init my streams like this:

int RL_tryout(char c)
{
        if (c == '\n') {
                // first output a carriage return
                RL_tryout('\r');
        }
        loop_until_bit_is_set(UCSR1A, UDRE);
        UDR1 = c;
}

void RL_USART_Init(uint16_t ubrr)
{
        UBRR1H = ubrr >> 8;
        UBRR1L = ubrr & 0xff;
        UCSR1B = _BV(TXEN);
        stdout = fdevopen(RL_tryout, NULL, 0);
        stderr = stdout;
}

Thanks,

        Sander

PS I know that only the _P routines should work in this case but I figured I
may as well try both.