Function parse_uevent_info

lib/hidapi/linux/hid.c:510–565

* The caller is responsible for free()ing the (newly-allocated) character * strings pointed to by serial_number_utf8 and product_name_utf8 after use. */

 * strings pointed to by serial_number_utf8 and product_name_utf8 after use.
 */
static int parse_uevent_info(const char *uevent, unsigned *bus_type,
	unsigned short *vendor_id, unsigned short *product_id,
	char **serial_number_utf8, char **product_name_utf8)
{
	char tmp[1024];
	size_t uevent_len = strlen(uevent);
	if (uevent_len > sizeof(tmp) - 1)
		uevent_len = sizeof(tmp) - 1;
	memcpy(tmp, uevent, uevent_len);
	tmp[uevent_len] = '\0';

	char *saveptr = NULL;
	char *line;
	char *key;
	char *value;

	int found_id = 0;
	int found_serial = 0;
	int found_name = 0;

	line = strtok_r(tmp, "\n", &saveptr);
	while (line != NULL) {
		/* line: "KEY=value" */
		key = line;
		value = strchr(line, '=');
		if (!value) {
			goto next_line;
		}
		*value = '\0';
		value++;

		if (strcmp(key, "HID_ID") == 0) {
			/**
			 *        type vendor   product
			 * HID_ID=0003:000005AC:00008242
			 **/
			int ret = sscanf(value, "%x:%hx:%hx", bus_type, vendor_id, product_id);
			if (ret == 3) {
				found_id = 1;
			}
		} else if (strcmp(key, "HID_NAME") == 0) {
			/* The caller has to free the product name */
			*product_name_utf8 = strdup(value);
			found_name = 1;
		} else if (strcmp(key, "HID_UNIQ") == 0) {
			/* The caller has to free the serial number */
			*serial_number_utf8 = strdup(value);
			found_serial = 1;
		}

next_line:
		line = strtok_r(NULL, "\n", &saveptr);
	}

	return (found_id && found_name && found_serial);
}