go/src/runtime/utf8.go

const runeError …

const runeSelf …

const maxRune …

const surrogateMin …

const surrogateMax …

const t1 …

const tx …

const t2 …

const t3 …

const t4 …

const t5 …

const maskx …

const mask2 …

const mask3 …

const mask4 …

const rune1Max …

const rune2Max …

const rune3Max …

const locb …

const hicb …

// countrunes returns the number of runes in s.
func countrunes(s string) int { … }

// decoderune returns the non-ASCII rune at the start of
// s[k:] and the index after the rune in s.
//
// decoderune assumes that caller has checked that
// the to be decoded rune is a non-ASCII rune.
//
// If the string appears to be incomplete or decoding problems
// are encountered (runeerror, k + 1) is returned to ensure
// progress when decoderune is used to iterate over a string.
func decoderune(s string, k int) (r rune, pos 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(p []byte, r rune) int { … }