mirror of
https://github.com/vbatts/go-mtree.git
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Vincent Batts
08b1000418
The current Vis() and Unvis() are using the C implementation from MTREE(8). But that means that cgo is used, which is not always desired. Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
28 lines
743 B
Go
28 lines
743 B
Go
package cvis
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// #include "vis.h"
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// #include <stdlib.h>
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import "C"
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import (
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"fmt"
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"math"
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"unsafe"
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)
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// Vis is a wrapper around the C implementation
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func Vis(src string, flags int) (string, error) {
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// dst needs to be 4 times the length of str, must check appropriate size
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if uint32(len(src)*4+1) >= math.MaxUint32/4 {
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return "", fmt.Errorf("failed to encode: %q", src)
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}
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dst := string(make([]byte, 4*len(src)+1))
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cDst, cSrc := C.CString(dst), C.CString(src)
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defer C.free(unsafe.Pointer(cDst))
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defer C.free(unsafe.Pointer(cSrc))
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C.strvis(cDst, cSrc, C.int(flags))
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return C.GoString(cDst), nil
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}
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// DefaultVisFlags are the common flags used in mtree string encoding
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var DefaultVisFlags = C.VIS_WHITE | C.VIS_OCTAL | C.VIS_GLOB
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