#include <linux/ucs2_string.h>#include <linux/module.h> /* Return the number of unicode characters in data */unsigned longucs2_strnlen(const ucs2_char_t *s, size_t maxlength){        unsigned long length = 0;         while (*s++ != 0 && length < maxlength)                length++;        return length;}EXPORT_SYMBOL(ucs2_strnlen); unsigned longucs2_strlen(const ucs2_char_t *s){        return ucs2_strnlen(s, ~0UL);}EXPORT_SYMBOL(ucs2_strlen); /* * Return the number of bytes is the length of this string * Note: this is NOT the same as the number of unicode characters */unsigned longucs2_strsize(const ucs2_char_t *data, unsigned long maxlength){        return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);}EXPORT_SYMBOL(ucs2_strsize); intucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len){        while (1) {                if (len == 0)                        return 0;                if (*a < *b)                        return -1;                if (*a > *b)                        return 1;                if (*a == 0) /* implies *b == 0 */                        return 0;                a++;                b++;                len--;        }}EXPORT_SYMBOL(ucs2_strncmp); unsigned longucs2_utf8size(const ucs2_char_t *src){	unsigned long i;	unsigned long j = 0; 	for (i = 0; i < ucs2_strlen(src); i++) {		u16 c = src[i]; 		if (c >= 0x800)			j += 3;		else if (c >= 0x80)			j += 2;		else			j += 1;	} 	return j;}EXPORT_SYMBOL(ucs2_utf8size); /* * copy at most maxlength bytes of whole utf8 characters to dest from the * ucs2 string src. * * The return value is the number of characters copied, not including the * final NUL character. */unsigned longucs2_as_utf8(u8 *dest, const ucs2_char_t *src, unsigned long maxlength){	unsigned int i;	unsigned long j = 0;	unsigned long limit = ucs2_strnlen(src, maxlength); 	for (i = 0; maxlength && i < limit; i++) {		u16 c = src[i]; 		if (c >= 0x800) {			if (maxlength < 3)				break;			maxlength -= 3;			dest[j++] = 0xe0 | (c & 0xf000) >> 12;			dest[j++] = 0x80 | (c & 0x0fc0) >> 6;			dest[j++] = 0x80 | (c & 0x003f);		} else if (c >= 0x80) {			if (maxlength < 2)				break;			maxlength -= 2;			dest[j++] = 0xc0 | (c & 0x7c0) >> 6;			dest[j++] = 0x80 | (c & 0x03f);		} else {			maxlength -= 1;			dest[j++] = c & 0x7f;		}	}	if (maxlength)		dest[j] = '\0';	return j;}EXPORT_SYMBOL(ucs2_as_utf8);