forked from lxc/go-lxc
/
util.go
102 lines (80 loc) · 1.95 KB
/
util.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
// Copyright © 2013, 2014, S.Çağlar Onur
// Use of this source code is governed by a LGPLv2.1
// license that can be found in the LICENSE file.
//
// Authors:
// S.Çağlar Onur <caglar@10ur.org>
// +build linux
package lxc
/*
#include <stdlib.h>
#include <lxc/lxccontainer.h>
static char** makeCharArray(int size) {
return calloc(sizeof(char*), size);
}
static void setArrayString(char **array, char *string, int n) {
array[n] = string;
}
static void freeCharArray(char **array, int size) {
int i;
for (i = 0; i < size; i++)
free(array[i]);
free(array);
}
static void freeSnapshotArray(struct lxc_snapshot *s, int size) {
int i;
for (i = 0; i < size; i++) {
s[i].free(&s[i]);
}
free(s);
}
*/
import "C"
import (
"unsafe"
)
func sptr(p uintptr) *C.char {
return *(**C.char)(unsafe.Pointer(p))
}
func makeNullTerminatedArgs(args []string) **C.char {
cparams := C.makeCharArray(C.int(len(args) + 1))
for i, s := range args {
C.setArrayString(cparams, C.CString(s), C.int(i))
}
C.setArrayString(cparams, nil, C.int(len(args)))
return cparams
}
func freeNullTerminatedArgs(cArgs **C.char, length int) {
C.freeCharArray(cArgs, C.int(length+1))
}
func convertArgs(cArgs **C.char) []string {
if cArgs == nil {
return nil
}
var s []string
// duplicate
for p := uintptr(unsafe.Pointer(cArgs)); sptr(p) != nil; p += unsafe.Sizeof(uintptr(0)) {
s = append(s, C.GoString(sptr(p)))
}
// free the original
C.freeCharArray(cArgs, C.int(len(s)))
return s
}
func convertNArgs(cArgs **C.char, size int) []string {
if cArgs == nil || size <= 0 {
return nil
}
var s []string
// duplicate
p := uintptr(unsafe.Pointer(cArgs))
for i := 0; i < size; i++ {
s = append(s, C.GoString(sptr(p)))
p += unsafe.Sizeof(uintptr(0))
}
// free the original
C.freeCharArray(cArgs, C.int(size))
return s
}
func freeSnapshots(snapshots *C.struct_lxc_snapshot, size int) {
C.freeSnapshotArray(snapshots, C.int(size))
}