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Tip revision: b2776bf7149bddd1f4161f14f79520f17fc1d71d authored by Linus Torvalds on 07 December 2014, 22:21:05 UTC
Linux 3.18
Linux 3.18
Tip revision: b2776bf
ucs2_string.c
#include <linux/ucs2_string.h>
#include <linux/module.h>
/* Return the number of unicode characters in data */
unsigned long
ucs2_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 long
ucs2_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 long
ucs2_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);
int
ucs2_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);