1#include <linux/ucs2_string.h>
 2#include <linux/module.h>
 3
 4/* Return the number of unicode characters in data */
 5unsigned long
 6ucs2_strnlen(const ucs2_char_t *s, size_t maxlength)
 7{
 8        unsigned long length = 0;
 9
10        while (*s++ != 0 && length < maxlength)
11                length++;
12        return length;
13}
14EXPORT_SYMBOL(ucs2_strnlen);
15
16unsigned long
17ucs2_strlen(const ucs2_char_t *s)
18{
19        return ucs2_strnlen(s, ~0UL);
20}
21EXPORT_SYMBOL(ucs2_strlen);
22
23/*
24 * Return the number of bytes is the length of this string
25 * Note: this is NOT the same as the number of unicode characters
26 */
27unsigned long
28ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength)
29{
30        return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);
31}
32EXPORT_SYMBOL(ucs2_strsize);
33
34int
35ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
36{
37        while (1) {
38                if (len == 0)
39                        return 0;
40                if (*a < *b)
41                        return -1;
42                if (*a > *b)
43                        return 1;
44                if (*a == 0) /* implies *b == 0 */
45                        return 0;
46                a++;
47                b++;
48                len--;
49        }
50}
51EXPORT_SYMBOL(ucs2_strncmp);

  1#include <linux/ucs2_string.h>
  2#include <linux/module.h>
  3
  4/* Return the number of unicode characters in data */
  5unsigned long
  6ucs2_strnlen(const ucs2_char_t *s, size_t maxlength)
  7{
  8        unsigned long length = 0;
  9
 10        while (*s++ != 0 && length < maxlength)
 11                length++;
 12        return length;
 13}
 14EXPORT_SYMBOL(ucs2_strnlen);
 15
 16unsigned long
 17ucs2_strlen(const ucs2_char_t *s)
 18{
 19        return ucs2_strnlen(s, ~0UL);
 20}
 21EXPORT_SYMBOL(ucs2_strlen);
 22
 23/*
 24 * Return the number of bytes is the length of this string
 25 * Note: this is NOT the same as the number of unicode characters
 26 */
 27unsigned long
 28ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength)
 29{
 30        return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);
 31}
 32EXPORT_SYMBOL(ucs2_strsize);
 33
 34int
 35ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
 36{
 37        while (1) {
 38                if (len == 0)
 39                        return 0;
 40                if (*a < *b)
 41                        return -1;
 42                if (*a > *b)
 43                        return 1;
 44                if (*a == 0) /* implies *b == 0 */
 45                        return 0;
 46                a++;
 47                b++;
 48                len--;
 49        }
 50}
 51EXPORT_SYMBOL(ucs2_strncmp);
 52
 53unsigned long
 54ucs2_utf8size(const ucs2_char_t *src)
 55{
 56	unsigned long i;
 57	unsigned long j = 0;
 58
 59	for (i = 0; src[i]; i++) {
 60		u16 c = src[i];
 61
 62		if (c >= 0x800)
 63			j += 3;
 64		else if (c >= 0x80)
 65			j += 2;
 66		else
 67			j += 1;
 68	}
 69
 70	return j;
 71}
 72EXPORT_SYMBOL(ucs2_utf8size);
 73
 74/*
 75 * copy at most maxlength bytes of whole utf8 characters to dest from the
 76 * ucs2 string src.
 77 *
 78 * The return value is the number of characters copied, not including the
 79 * final NUL character.
 80 */
 81unsigned long
 82ucs2_as_utf8(u8 *dest, const ucs2_char_t *src, unsigned long maxlength)
 83{
 84	unsigned int i;
 85	unsigned long j = 0;
 86	unsigned long limit = ucs2_strnlen(src, maxlength);
 87
 88	for (i = 0; maxlength && i < limit; i++) {
 89		u16 c = src[i];
 90
 91		if (c >= 0x800) {
 92			if (maxlength < 3)
 93				break;
 94			maxlength -= 3;
 95			dest[j++] = 0xe0 | (c & 0xf000) >> 12;
 96			dest[j++] = 0x80 | (c & 0x0fc0) >> 6;
 97			dest[j++] = 0x80 | (c & 0x003f);
 98		} else if (c >= 0x80) {
 99			if (maxlength < 2)
100				break;
101			maxlength -= 2;
102			dest[j++] = 0xc0 | (c & 0x7c0) >> 6;
103			dest[j++] = 0x80 | (c & 0x03f);
104		} else {
105			maxlength -= 1;
106			dest[j++] = c & 0x7f;
107		}
108	}
109	if (maxlength)
110		dest[j] = '\0';
111	return j;
112}
113EXPORT_SYMBOL(ucs2_as_utf8);