On 08/28/2016 11:00 PM, Philipp Klaus Krause wrote:
> Wondering how printf("") might cause problems, I looked at the executed
> code in printf_large. Basically it should just do a read from the
> pointer, see that we are at the end of the string and return.
>
> So I found the read from a pointer is the problem. Placing a read from a
> generic pointer in main() causes the same issues as the call to printf()
> (as long a printf() is linked into the binary). The attached example
> code printf "Hello " again and again, but never "World!".
>
> Philipp
>
Just to confirm your findings I have this function as my "printf":
void send_string(unsigned char *string)
{
while(*string)
send_byte(*string++); // Send string 1 byte at a time
}
And writing chars was fine but not strings.
MvH
Benjamin Larsson
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