blob: 001687e3ca06d9444a0c7769ae88021d1b07abb7 (
plain)
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
|
// Copyright 2024 The Libc Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package libc is a partial reimplementation of C libc in pure Go.
package libc // import "modernc.org/libc"
import (
"sync/atomic"
"unsafe"
"golang.org/x/exp/constraints"
)
func X__sync_add_and_fetch[T constraints.Integer](t *TLS, p uintptr, v T) T {
switch unsafe.Sizeof(v) {
case 4:
return T(atomic.AddInt32((*int32)(unsafe.Pointer(p)), int32(v)))
case 8:
return T(atomic.AddInt64((*int64)(unsafe.Pointer(p)), int64(v)))
default:
panic(todo(""))
}
}
func X__sync_sub_and_fetch[T constraints.Integer](t *TLS, p uintptr, v T) T {
switch unsafe.Sizeof(v) {
case 4:
return T(atomic.AddInt32((*int32)(unsafe.Pointer(p)), -int32(v)))
case 8:
return T(atomic.AddInt64((*int64)(unsafe.Pointer(p)), -int64(v)))
default:
panic(todo(""))
}
}
// GoString returns the value of a C string at s.
func GoString(s uintptr) string {
if s == 0 {
return ""
}
p := s
for *(*byte)(unsafe.Pointer(p)) != 0 {
p++
}
return string(unsafe.Slice((*byte)(unsafe.Pointer(s)), p-s))
}
// GoBytes returns a byte slice from a C char* having length len bytes.
func GoBytes(s uintptr, len int) []byte {
return unsafe.Slice((*byte)(unsafe.Pointer(s)), len)
}
|
