Take a comma delimited string and put into a buf

csv_to_buf.c

ssize_t csv_to_buf(const char *line, uint16_t *buf, size_t len)
{
	int i = 0;
	ssize_t buf_len = 0;

	if (line == NULL || !(strlen(line))) {
		log_err("invalid line buffer, len = %lu\n", strlen(line));
		return -1;
	}

	if (buf == NULL || len < 100) {
		log_err("buf to fill is invalid\n");
		return -1;
	}

	memset(buf, 0, len);

	/* first count comma's */
	while (i < strlen(line) ) {
		if (line[i++] == ',')
			buf_len++;

	}

	log_debug("number of commas in string: %zd\n", buf_len);
	
	if (!(buf_len)) {
		log_err("worst CSV ever, not a single comma\n");
		return -1;
	}

	len = strlen(line);
	i = 0;
	buf_len = 0;

	/* convert string to buf */
	while (i < strlen(line)) {
		buf[buf_len++] = strtol(&line[i], NULL, 10);
		while (line[i++] != ',' && i < strlen(line));
	}

	i = buf_len-1;

	/* chop off all appended zeros */
	while (i) {
		if (buf[i--] == 0)
			buf_len --;
	}

	return buf_len;
}