Merge "Merge remote-tracking branch 'origin/dev/dev-kernel-3.18-lz4-zram' into dev...
[linux-3.10.git] / lib / ucs2_string.c
1 #include <linux/ucs2_string.h>
2 #include <linux/module.h>
3
4 /* Return the number of unicode characters in data */
5 unsigned long
6 ucs2_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 }
14 EXPORT_SYMBOL(ucs2_strnlen);
15
16 unsigned long
17 ucs2_strlen(const ucs2_char_t *s)
18 {
19         return ucs2_strnlen(s, ~0UL);
20 }
21 EXPORT_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  */
27 unsigned long
28 ucs2_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 }
32 EXPORT_SYMBOL(ucs2_strsize);
33
34 int
35 ucs2_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 }
51 EXPORT_SYMBOL(ucs2_strncmp);