USB_GADGET_GET_STRIN(9) Kernel Mode Gadget API USB_GADGET_GET_STRIN(9)NAME
usb_gadget_get_string - fill out a string descriptor
SYNOPSIS
int usb_gadget_get_string(struct usb_gadget_strings * table, int id, u8 * buf);
ARGUMENTS
table
of c strings encoded using UTF-8
id
string id, from low byte of wValue in get string descriptor
buf
at least 256 bytes
DESCRIPTION
Finds the UTF-8 string matching the ID, and converts it into a string descriptor in utf16-le. Returns length of descriptor (always even) or
negative errno
If your driver needs stings in multiple languages, you'll probably "switch (wIndex) { ... }" in your ep0 string descriptor logic, using
this routine after choosing which set of UTF-8 strings to use. Note that US-ASCII is a strict subset of UTF-8; any string bytes with the
eighth bit set will be multibyte UTF-8 characters, not ISO-8859/1 characters (which are also widely used in C strings).
AUTHOR
David Brownell <dbrownell@users.sourceforge.net>
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_GADGET_GET_STRIN(9)
Check Out this Related Man Page
UTF8_ENCODE(3) 1 UTF8_ENCODE(3)utf8_encode - Encodes an ISO-8859-1 string to UTF-8SYNOPSIS
string utf8_encode (string $data)
DESCRIPTION
This function encodes the string $data to UTF-8, and returns the encoded version. UTF-8 is a standard mechanism used by Unicode for
encoding wide character values into a byte stream. UTF-8 is transparent to plain ASCII characters, is self-synchronized (meaning it is
possible for a program to figure out where in the bytestream characters start) and can be used with normal string comparison functions for
sorting and such. PHP encodes UTF-8 characters in up to four bytes, like this:
UTF-8 encoding
+------+-------------------------------------+---+
|bytes | | |
| | | |
| | bits | |
| | | |
| | representation | |
| | | |
+------+-------------------------------------+---+
| 1 | | |
| | | |
| | 7 | |
| | | |
| | 0bbbbbbb | |
| | | |
| 2 | | |
| | | |
| | 11 | |
| | | |
| | 110bbbbb 10bbbbbb | |
| | | |
| 3 | | |
| | | |
| | 16 | |
| | | |
| | 1110bbbb 10bbbbbb 10bbbbbb | |
| | | |
| 4 | | |
| | | |
| | 21 | |
| | | |
| | 11110bbb 10bbbbbb 10bbbbbb 10bbbbbb | |
| | | |
+------+-------------------------------------+---+
Each b represents a bit that can be used to store character data.
PARAMETERS
o $data
- An ISO-8859-1 string.
RETURN VALUES
Returns the UTF-8 translation of $data.
SEE ALSO utf8_decode(3).
PHP Documentation Group UTF8_ENCODE(3)
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