#469 setvbuf() corrupts shell prompt.

[Matthias Rustler]

#include <stdio.h>

int main(void)
{
    int result = setvbuf(stdout, NULL, _IONBF, 0);
    printf("result %d\n", result);
    return 0;
}

After running this on a i386-linux-ABIv1 system the Shell prompt is corrupt. It prints the escape sequences literally. See attached screenshot.