| 1 | |
| 2 | #include <linux/ucs2_string.h>
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| 3 | #include <linux/module.h>
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| 4 |
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| 5 |
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| 6 | unsigned long
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| 7 | ucs2_strnlen(const ucs2_char_t *s, size_t maxlength)
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| 8 | {
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| 9 | unsigned long length = 0;
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| 10 |
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| 11 | while (*s++ != 0 && length < maxlength)
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| 12 | length++;
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| 13 | return length;
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| 14 | }
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| 15 | EXPORT_SYMBOL(ucs2_strnlen);
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| 16 |
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| 17 | unsigned long
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| 18 | ucs2_strlen(const ucs2_char_t *s)
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| 19 | {
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| 20 | return ucs2_strnlen(s, ~0UL);
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| 21 | }
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| 22 | EXPORT_SYMBOL(ucs2_strlen);
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| 23 |
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| 24 | |
| 25 | * Return the number of bytes is the length of this string
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| 26 | * Note: this is NOT the same as the number of unicode characters
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| 27 |
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| 28 | unsigned long
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| 29 | ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength)
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| 30 | {
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| 31 | return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);
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| 32 | }
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| 33 | EXPORT_SYMBOL(ucs2_strsize);
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| 34 |
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| 35 | int
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| 36 | ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
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| 37 | {
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| 38 | while (1) {
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| 39 | if (len == 0)
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| 40 | return 0;
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| 41 | if (*a < *b)
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| 42 | return -1;
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| 43 | if (*a > *b)
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| 44 | return 1;
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| 45 | if (*a == 0)
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| 46 | return 0;
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| 47 | a++;
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| 48 | b++;
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| 49 | len--;
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| 50 | }
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| 51 | }
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| 52 | EXPORT_SYMBOL(ucs2_strncmp);
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| 53 |
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| 54 | unsigned long
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| 55 | ucs2_utf8size(const ucs2_char_t *src)
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| 56 | {
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| 57 | unsigned long i;
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| 58 | unsigned long j = 0;
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| 59 |
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| 60 | for (i = 0; src[i]; i++) {
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| 61 | u16 c = src[i];
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| 62 |
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| 63 | if (c >= 0x800)
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| 64 | j += 3;
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| 65 | else if (c >= 0x80)
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| 66 | j += 2;
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| 67 | else
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| 68 | j += 1;
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| 69 | }
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| 70 |
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| 71 | return j;
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| 72 | }
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| 73 | EXPORT_SYMBOL(ucs2_utf8size);
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| 74 |
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| 75 | |
| 76 | * copy at most maxlength bytes of whole utf8 characters to dest from the
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| 77 | * ucs2 string src.
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| 78 | *
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| 79 | * The return value is the number of characters copied, not including the
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| 80 | * final NUL character.
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| 81 |
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| 82 | unsigned long
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| 83 | ucs2_as_utf8(u8 *dest, const ucs2_char_t *src, unsigned long maxlength)
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| 84 | {
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| 85 | unsigned int i;
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| 86 | unsigned long j = 0;
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| 87 | unsigned long limit = ucs2_strnlen(src, maxlength);
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| 88 |
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| 89 | for (i = 0; maxlength && i < limit; i++) {
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| 90 | u16 c = src[i];
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| 91 |
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| 92 | if (c >= 0x800) {
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| 93 | if (maxlength < 3)
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| 94 | break;
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| 95 | maxlength -= 3;
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| 96 | dest[j++] = 0xe0 | (c & 0xf000) >> 12;
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| 97 | dest[j++] = 0x80 | (c & 0x0fc0) >> 6;
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| 98 | dest[j++] = 0x80 | (c & 0x003f);
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| 99 | } else if (c >= 0x80) {
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| 100 | if (maxlength < 2)
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| 101 | break;
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| 102 | maxlength -= 2;
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| 103 | dest[j++] = 0xc0 | (c & 0x7c0) >> 6;
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| 104 | dest[j++] = 0x80 | (c & 0x03f);
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| 105 | } else {
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| 106 | maxlength -= 1;
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| 107 | dest[j++] = c & 0x7f;
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| 108 | }
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| 109 | }
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| 110 | if (maxlength)
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| 111 | dest[j] = '\0';
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| 112 | return j;
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| 113 | }
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| 114 | EXPORT_SYMBOL(ucs2_as_utf8);
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