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ergo/vendor/github.com/goshuirc/irc-go/ircutils/unicode.go
2021-03-18 03:56:57 -04:00

26 lines
562 B
Go

// Copyright (c) 2021 Shivaram Lingamneni
// Released under the MIT License
package ircutils
import (
"unicode/utf8"
)
// truncate a message, taking care not to make valid UTF8 into invalid UTF8
func TruncateUTF8Safe(message string, byteLimit int) (result string) {
if len(message) <= byteLimit {
return message
}
message = message[:byteLimit]
for i := 0; i < (utf8.UTFMax - 1); i++ {
r, n := utf8.DecodeLastRuneInString(message)
if r == utf8.RuneError && n <= 1 {
message = message[:len(message)-1]
} else {
break
}
}
return message
}