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simpler fix for the negative rune problem, spotted seconds after submitting the previous fix.

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R=rsc
https://golang.org/cl/178044
This commit is contained in:
Rob Pike 2009-12-15 09:31:24 +11:00
parent a9e8befb49
commit 0d3f5a84b8
1 changed files with 17 additions and 19 deletions
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36
src/pkg/utf8/utf8.go
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@ -227,37 +227,35 @@ func RuneLen(rune int) int {
// EncodeRune writes into p (which must be large enough) the UTF-8 encoding of the rune.
// It returns the number of bytes written.
func EncodeRune(rune int, p []byte) int {
// Negative values are erroneous.
if rune < 0 {
rune = RuneError
}
// Negative values are erroneous. Making it unsigned addresses the problem.
r := uint(rune);
if rune <= _Rune1Max {
p[0] = byte(rune);
if r <= _Rune1Max {
p[0] = byte(r);
return 1;
}
if rune <= _Rune2Max {
p[0] = _T2 | byte(rune>>6);
p[1] = _Tx | byte(rune)&_Maskx;
if r <= _Rune2Max {
p[0] = _T2 | byte(r>>6);
p[1] = _Tx | byte(r)&_Maskx;
return 2;
}
if rune > unicode.MaxRune {
rune = RuneError
if r > unicode.MaxRune {
r = RuneError
}
if rune <= _Rune3Max {
p[0] = _T3 | byte(rune>>12);
p[1] = _Tx | byte(rune>>6)&_Maskx;
p[2] = _Tx | byte(rune)&_Maskx;
if r <= _Rune3Max {
p[0] = _T3 | byte(r>>12);
p[1] = _Tx | byte(r>>6)&_Maskx;
p[2] = _Tx | byte(r)&_Maskx;
return 3;
}
p[0] = _T4 | byte(rune>>18);
p[1] = _Tx | byte(rune>>12)&_Maskx;
p[2] = _Tx | byte(rune>>6)&_Maskx;
p[3] = _Tx | byte(rune)&_Maskx;
p[0] = _T4 | byte(r>>18);
p[1] = _Tx | byte(r>>12)&_Maskx;
p[2] = _Tx | byte(r>>6)&_Maskx;
p[3] = _Tx | byte(r)&_Maskx;
return 4;
}