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>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
#include <linux/ucs2_string.h>
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#include <linux/module.h>
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/* Return the number of unicode characters in data */
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unsigned long
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ucs2_strnlen(const ucs2_char_t *s, size_t maxlength)
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{
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unsigned long length = 0;
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while (*s++ != 0 && length < maxlength)
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length++;
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return length;
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}
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EXPORT_SYMBOL(ucs2_strnlen);
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unsigned long
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ucs2_strlen(const ucs2_char_t *s)
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{
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return ucs2_strnlen(s, ~0UL);
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}
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EXPORT_SYMBOL(ucs2_strlen);
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/*
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* Return the number of bytes is the length of this string
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* Note: this is NOT the same as the number of unicode characters
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*/
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unsigned long
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ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength)
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{
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return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);
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}
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EXPORT_SYMBOL(ucs2_strsize);
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int
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ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
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{
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while (1) {
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if (len == 0)
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return 0;
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if (*a < *b)
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return -1;
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if (*a > *b)
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return 1;
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if (*a == 0) /* implies *b == 0 */
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return 0;
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a++;
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b++;
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len--;
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}
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}
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EXPORT_SYMBOL(ucs2_strncmp);
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