mirror of
https://github.com/AsahiLinux/u-boot
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76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
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#ifndef _LINUX_UTF_H
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#define _LINUX_UTF_H
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#include <asm/unaligned.h>
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static inline int utf8_to_utf16le(const char *s, __le16 *cp, unsigned len)
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{
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int count = 0;
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u8 c;
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u16 uchar;
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/*
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* this insists on correct encodings, though not minimal ones.
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* BUT it currently rejects legit 4-byte UTF-8 code points,
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* which need surrogate pairs. (Unicode 3.1 can use them.)
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*/
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while (len != 0 && (c = (u8) *s++) != 0) {
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if ((c & 0x80)) {
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/*
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* 2-byte sequence:
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* 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx
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*/
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if ((c & 0xe0) == 0xc0) {
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uchar = (c & 0x1f) << 6;
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c = (u8) *s++;
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if ((c & 0xc0) != 0x80)
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goto fail;
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c &= 0x3f;
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uchar |= c;
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/*
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* 3-byte sequence (most CJKV characters):
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* zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx
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*/
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} else if ((c & 0xf0) == 0xe0) {
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uchar = (c & 0x0f) << 12;
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c = (u8) *s++;
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if ((c & 0xc0) != 0x80)
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goto fail;
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c &= 0x3f;
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uchar |= c << 6;
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c = (u8) *s++;
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if ((c & 0xc0) != 0x80)
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goto fail;
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c &= 0x3f;
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uchar |= c;
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/* no bogus surrogates */
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if (0xd800 <= uchar && uchar <= 0xdfff)
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goto fail;
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/*
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* 4-byte sequence (surrogate pairs, currently rare):
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* 11101110wwwwzzzzyy + 110111yyyyxxxxxx
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* = 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx
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* (uuuuu = wwww + 1)
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* FIXME accept the surrogate code points (only)
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*/
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} else
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goto fail;
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} else
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uchar = c;
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put_unaligned_le16(uchar, cp++);
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count++;
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len--;
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}
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return count;
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fail:
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return -1;
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}
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#endif /* _LINUX_UTF_H */
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