counting printfs

// is undefined behaviour, works on gcc
#include <stdio.h>
#include <stdarg.h>

int printf_count = 0;
int printf(const char *fmt, ...)
{
printf_count++;

va_list va;
va_start(va, fmt);
int ret = vprintf(fmt, va);
va_end(va);

return ret;
}
int main (void)
{
    printf("TEST\n");
    printf("TEST\n");
    printf("TEST\n");

    printf("%d printf's were called", printf_count);
    return 0;
}