Get a string descriptor
#include <sys/usbdi.h> char *usbd_string( struct usbd_device *device, uint8_t index, int langid );
libusbdi
The usbd_string() function lets you obtain a string from the USB device's table of strings, which typically contains the names of the vendor, the product, etc. The string table is optional.
The strings are actually in Unicode/wide characters, so usb_string() converts them to UTF-8 (byte stream) for you and places the resulting string in a static buffer that's reused every time the function is called. The returned string includes a terminating null character. |
A pointer to the string in an internal static buffer, or NULL on error or if the string table doesn't exist.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | No |
usbd_args_lookup(), usbd_configuration_descriptor(), usbd_device_lookup(), usbd_device_extra(), usbd_device_descriptor(), usbd_endpoint_descriptor(), usbd_hcd_info(), usbd_hub_descriptor(), usbd_interface_descriptor(), usbd_languages_descriptor(), usbd_parse_descriptors(), usbd_urb_status()