printf requires string to end with \n - is there a workaround?

Hi,
Which version of library are you linking against, newlib or newlib-nano?

Thanks.

Using newlib-nano with the 2013q2 release

Could you please try it out with newlib?
Since I have no environment to reproduce the problem, I have to ask you for help.

Thanks.

Ok how do I specify to have it compile with newlib over newlib-nano?

It's documented in readme.txt.

Ok, I can try, but I do know this works with Code Red's Redlib...

While I'm doing this - can you check with the developer to see if this is a limitation of newlib-nano? It seems there are other implementations of printf to STDOUT require a "\n" to flush the buffer..

See. http://stackoverflow.com/questions/1716296/why-does-printf-not-flush-after-the-call-unless-a-newline-is-in-the-format-strin

I tried:

    fflush(stdout);

But, this doesn't do the trick either..

Is there any testcase in your development environment which exercises the printf without a newline?

Hi,
I think this is because stdout is buffered by default.
Take below program as an example:
#include <stdio.h>

int main (void)
{
    fprintf (stdout, "hello");
    fprintf (stderr, "world");

    return 0;
}

If I build and run it with below command lines:
arm-none-eabi-gcc -mthumb -mcpu=cortex-m3 -O2 test.c -o test.axf --specs=rdimon.specs -lc -lrdimon -lc
qemu-system-arm -nographic -serial null -monitor null -semihosting -kernel test.axf -cpu cortex-m3

The output is "worldhello" because stdout is buffered and stderr is not.

If I change the program into :
#include <stdio.h>

int main (void)
{
    fprintf (stdout, "hello");
    fflush (stdout);
    fprintf (stderr, "world");

    return 0;
}
With same command lines the output is "helloworld".

I think this can illustrate the buffer strategy well.

Still I am not sure why fflush does not work in your case, which works fine for me.

As for the redlib, I think they might have the buffer facility optimized out, but this is just a guess without access to the source code.

Thanks.

Thanks - I'll try this...

Is there a way to turn the buffering off? Not sure why I'd want this because my UART driver requires as driver anyways..

Answered my own question, but figured I'd share with others (and confirm with the developers)...

setvbuf(stdout, NULL, _IONBF, 0);