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116 lines
2.5 KiB
116 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#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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unsigned long |
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ucs2_utf8size(const ucs2_char_t *src) |
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{ |
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unsigned long i; |
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unsigned long j = 0; |
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for (i = 0; src[i]; i++) { |
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u16 c = src[i]; |
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if (c >= 0x800) |
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j += 3; |
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else if (c >= 0x80) |
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j += 2; |
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else |
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j += 1; |
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} |
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return j; |
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} |
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EXPORT_SYMBOL(ucs2_utf8size); |
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/* |
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* copy at most maxlength bytes of whole utf8 characters to dest from the |
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* ucs2 string src. |
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* |
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* The return value is the number of characters copied, not including the |
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* final NUL character. |
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*/ |
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unsigned long |
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ucs2_as_utf8(u8 *dest, const ucs2_char_t *src, unsigned long maxlength) |
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{ |
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unsigned int i; |
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unsigned long j = 0; |
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unsigned long limit = ucs2_strnlen(src, maxlength); |
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for (i = 0; maxlength && i < limit; i++) { |
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u16 c = src[i]; |
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if (c >= 0x800) { |
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if (maxlength < 3) |
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break; |
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maxlength -= 3; |
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dest[j++] = 0xe0 | (c & 0xf000) >> 12; |
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dest[j++] = 0x80 | (c & 0x0fc0) >> 6; |
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dest[j++] = 0x80 | (c & 0x003f); |
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} else if (c >= 0x80) { |
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if (maxlength < 2) |
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break; |
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maxlength -= 2; |
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dest[j++] = 0xc0 | (c & 0x7c0) >> 6; |
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dest[j++] = 0x80 | (c & 0x03f); |
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} else { |
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maxlength -= 1; |
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dest[j++] = c & 0x7f; |
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} |
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} |
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if (maxlength) |
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dest[j] = '\0'; |
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return j; |
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} |
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EXPORT_SYMBOL(ucs2_as_utf8); |
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MODULE_LICENSE("GPL v2");
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