Function vsnprintf_wstr_write

kernel/generic/src/printf/vsnprintf.c:135–168

Write wide string to given buffer. * * Write at most data->size plain characters including trailing zero. * According to C99, snprintf() has to return number of characters that * would have been written if enough space had been available. Hence * the return value is not the number of actually printed characters * but size of the input string. * * @param str Source wide string to print. *

 *
 */
static int vsnprintf_wstr_write(const char32_t *str, size_t size, vsnprintf_data_t *data)
{
	size_t index = 0;

	while (index < (size / sizeof(char32_t))) {
		size_t left = data->size - data->len;

		if (left == 0)
			return ((int) size);

		if (left == 1) {
			/*
			 * We have only one free byte left in buffer
			 * -> store trailing zero
			 */
			data->dst[data->size - 1] = 0;
			data->len = data->size;
			return ((int) size);
		}

		if (chr_encode(str[index], data->dst, &data->len, data->size - 1) != EOK)
			break;

		index++;
	}

	/*
	 * Put trailing zero at end, but not count it
	 * into data->len so it could be rewritten next time
	 */
	data->dst[data->len] = 0;

	return ((int) size);
}

int vsnprintf(char *str, size_t size, const char *fmt, va_list ap)
{