ml
57 lines
1.0 KiB
Go
57 lines
1.0 KiB
Go
package serial_test
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import (
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"fmt"
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"io"
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"github.com/inkyblackness/hacked/ss1"
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)
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type errorBuffer struct {
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position int64
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callCounter int
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errorOnNextCall bool
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errorByteCount int
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}
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func (buf *errorBuffer) check() (err error) {
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buf.callCounter++
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if buf.errorOnNextCall {
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buf.errorOnNextCall = false
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err = ss1.StringError(fmt.Sprintf("errorBuffer on call number %v", buf.callCounter))
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}
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return
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}
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func (buf *errorBuffer) Seek(offset int64, whence int) (int64, error) {
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err := buf.check()
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if err != nil {
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return 0, err
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}
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switch whence {
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case io.SeekStart:
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buf.position = offset
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case io.SeekCurrent:
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buf.position += offset
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case io.SeekEnd:
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panic("SeekEnd not supported")
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}
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return buf.position, nil
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}
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func (buf *errorBuffer) Read(p []byte) (n int, err error) {
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err = buf.check()
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if err != nil {
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return buf.errorByteCount, err
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}
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return len(p), nil
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}
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func (buf *errorBuffer) Write(p []byte) (n int, err error) {
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err = buf.check()
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if err != nil {
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return buf.errorByteCount, err
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}
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return len(p), nil
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}
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