usb/gadget/usbstring.c

4  * SPDX-License-Identifier:	LGPL-2.1+
6  * Ported to U-Boot by: Thomas Smits <ts.smits@gmail.com> and
26 	 * BUT it currently rejects legit 4-byte UTF-8 code points,  in utf8_to_utf16le()
32 			 * 2-byte sequence:  in utf8_to_utf16le()
45 			 * 3-byte sequence (most CJKV characters):  in utf8_to_utf16le()
68 			 * 4-byte sequence (surrogate pairs, currently rare):  in utf8_to_utf16le()
80 		len--;  in utf8_to_utf16le()
84 	return -1;  in utf8_to_utf16le()
89  * usb_gadget_get_string - fill out a string descriptor
90  * @table: of c strings encoded using UTF-8
94  * Finds the UTF-8 string matching the ID, and converts it into a
95  * string descriptor in utf16-le.
100  * using this routine after choosing which set of UTF-8 strings to use.
101  * Note that US-ASCII is a strict subset of UTF-8; any string bytes with
102  * the eighth bit set will be multibyte UTF-8 characters, not ISO-8859/1
112 		return -EINVAL;  in usb_gadget_get_string()
118 		buf[2] = (u8) table->language;  in usb_gadget_get_string()
119 		buf[3] = (u8) (table->language >> 8);  in usb_gadget_get_string()
122 	for (s = table->strings; s && s->s; s++)  in usb_gadget_get_string()
123 		if (s->id == id)  in usb_gadget_get_string()
127 	if (!s || !s->s)  in usb_gadget_get_string()
128 		return -EINVAL;  in usb_gadget_get_string()
130 	/* string descriptors have length, tag, then UTF16-LE text */  in usb_gadget_get_string()
131 	len = min((size_t) 126, strlen(s->s));  in usb_gadget_get_string()
133 	len = utf8_to_utf16le(s->s, (__le16 *)&buf[2], len);  in usb_gadget_get_string()
135 		return -EINVAL;  in usb_gadget_get_string()