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);