Function vsnprintf_str_write

kernel/generic/src/printf/vsnprintf.c:64–116

Write 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 string to print. * @param si

 *
 */
static int vsnprintf_str_write(const char *str, size_t size, vsnprintf_data_t *data)
{
	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 (left <= size) {
		/*
		 * We do not have enough space for the whole string
		 * with the trailing zero => print only a part
		 * of string
		 */
		size_t index = 0;

		while (index < size) {
			char32_t uc = str_decode(str, &index, size);

			if (chr_encode(uc, data->dst, &data->len, data->size - 1) != EOK)
				break;
		}

		/*
		 * 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);
	}

	/* Buffer is big enough to print the whole string */
	memcpy((void *)(data->dst + data->len), (void *) str, size);
	data->len += size;

	/*
	 * 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);
}

/** Write wide string to given buffer.
 *