linux/lib/ucs2_string.c
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   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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