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Implement PrefixWriter

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PrefixWriter is a passthrough io.Writer that prepends a prefix to the
beginning of each line.
This commit is contained in:
Achilleas Anagnostopoulos
2017-07-08 18:12:29 +01:00
parent b1084c1362
commit da279cf3ff
3 changed files with 155 additions and 4 deletions
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10
src/gopheros/kernel/hal/hal.go
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@@ -51,16 +51,18 @@ func probe(hwProbeFns []device.ProbeFn) []device.Driver {
continue
}
strBuf.Reset()
major, minor, patch := drv.DriverVersion()
kfmt.Fprintf(&strBuf, "[hal] %s(%d.%d.%d): ", drv.DriverName(), major, minor, patch)
w.prefix = strBuf.Bytes()
kfmt.Printf("[hal] %s(%d.%d.%d): ", drv.DriverName(), major, minor, patch)
if err := drv.DriverInit(); err != nil {
kfmt.Printf("init failed: %s\n", err.Message)
if err := drv.DriverInit(&w); err != nil {
kfmt.Fprintf(&w, "init failed: %s\n", err.Message)
continue
}
kfmt.Fprintf(&w, "initialized\n")
drivers = append(drivers, drv)
kfmt.Printf("initialized\n")
}
return drivers