mirror of
https://github.com/renorris/openfsd
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b899f56871
Pure wire-format package with goldens from docs/protocol.md and differential adapters in fsd. Coverage floor for protocol package.
35 lines
849 B
Go
35 lines
849 B
Go
package protocol
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import (
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"fmt"
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"io"
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"strconv"
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"strings"
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)
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// FormatError builds an FSD $ER packet matching openfsd wire format:
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//
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// $ERserver:unknown:%d::%s\r\n
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//
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// Note: openfsd uses lowercase "server", unpadded error code, and empty
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// causing-parameter field — not the docs form $ERSERVER:unknown:006::...
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func FormatError(code ErrorCode, message string) string {
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var b strings.Builder
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b.Grow(32 + len(message))
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b.WriteString("$ERserver:unknown:")
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b.WriteString(strconv.Itoa(int(code)))
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b.WriteString("::")
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b.WriteString(message)
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b.WriteString("\r\n")
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return b.String()
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}
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// WriteError writes a formatted $ER packet to w.
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func WriteError(w io.Writer, code ErrorCode, message string) error {
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if w == nil {
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return fmt.Errorf("protocol: nil writer")
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}
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_, err := io.WriteString(w, FormatError(code, message))
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return err
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}
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