mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 14:52:05 +00:00
0635eb8a54
We want to be able to use the utf16 functions that are currently present in the EFI variables code in platform-specific code as well. Move them to the kernel core, and in the process rename them to accurately describe what they do - they don't handle UTF16, only UCS2. Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
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);
|