static void snprintf_fallback_impl()

in v2/src/get_thread_stack.c [55:84]

• 23 lines of code
• 4 McCabe index (conditional complexity)

static void snprintf_fallback_impl(char** destination, size_t* destination_size, const char* fallback_string, size_t fallbackstring_size, const char* format, ...)
{
    va_list args;
    va_start(args, format);

    int snprintfResult;

    /*trying to complain*/
    snprintfResult = vsnprintf(*destination, *destination_size, format, args);
    if (!(
        (snprintfResult >= 0) && /*the returned value is nonnegative [...]*/
        (snprintfResult < (int)(*destination_size)) /*[...] and less than n.*/
        ))
    {
        /*complain about not being able to complain - only copy the part of the fallback string that fits*/

        size_t size_to_copy = *destination_size < fallbackstring_size ? *destination_size : fallbackstring_size - 1;
        (void)memcpy(*destination, fallback_string, size_to_copy);

        (*destination) += size_to_copy;
        (*destination_size) -= size_to_copy;
    }
    else
    {
        /*complain*/
        (*destination) += snprintfResult;
        (*destination_size) -= snprintfResult;
    }
    va_end(args);
}