27 lines
660 B
Go
27 lines
660 B
Go
|
package netln
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/reiver/go-utf8"
|
||
|
|
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
)
|
||
|
|
|
||
|
|
// writeRune deals with writing a single rune.
|
||
|
|
//
|
||
|
|
// It also makes sure that any error condition is represented as a Go error.
|
||
|
|
//
|
||
|
|
// It also wraps any errors, and provides a more appropriate error message.
|
||
|
|
func writeRune(writer io.Writer, r rune, expectedWritten int) error {
|
||
|
|
|
||
|
|
n, err := utf8.WriteRune(writer, r)
|
||
|
|
if nil != err {
|
||
|
|
return fmt.Errorf("problem writing UTF-8 character %U: %w", r, err)
|
||
|
|
}
|
||
|
|
if expectedWritten != n {
|
||
|
|
return fmt.Errorf("problem writing UTF-8 character %U — expected to write %d bytes, but actually wrote %b bytes", r, expectedWritten, n)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|