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go-mtree/vis.go
Stephen Chung 773763fb87 vis: refactored code to reflect using vis/unvis for file names
Added some more test cases for `vis`ing and `unvis`ing
strings, and a test case that walks/checks a directory with
filenames that require encoding. Had to change Path() to account
for possible errors Unvis() could return. Refactored Vis()/Unvis() into
go-mtree tar functionality as well.

Signed-off-by: Stephen Chung <schung@redhat.com>
2016-07-25 16:41:06 -04:00

26 lines
700 B
Go

package mtree
// #include "vis.h"
// #include <stdlib.h>
import "C"
import (
"fmt"
"math"
"unsafe"
)
// Vis is a wrapper of the C implementation of the function vis, which encodes
// a character with a particular format/style
func Vis(src string) (string, error) {
// dst needs to be 4 times the length of str, must check appropriate size
if uint32(len(src)*4+1) >= math.MaxUint32/4 {
return "", fmt.Errorf("failed to encode: %q", src)
}
dst := string(make([]byte, 4*len(src)+1))
cDst, cSrc := C.CString(dst), C.CString(src)
defer C.free(unsafe.Pointer(cDst))
defer C.free(unsafe.Pointer(cSrc))
C.strvis(cDst, cSrc, C.VIS_WHITE|C.VIS_OCTAL|C.VIS_GLOB)
return C.GoString(cDst), nil
}