Root/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 */
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

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