106 lines
2.0 KiB
Go
106 lines
2.0 KiB
Go
// 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 (
|
|
"math"
|
|
"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 ""
|
|
}
|
|
|
|
if n := strlen(s); n != 0 {
|
|
return string(unsafe.Slice((*byte)(unsafe.Pointer(s)), n))
|
|
}
|
|
|
|
return ""
|
|
}
|
|
|
|
// 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)
|
|
}
|
|
|
|
func X__isfinitef(tls *TLS, f float32) int32 {
|
|
d := float64(f)
|
|
if !math.IsInf(d, 0) && !math.IsNaN(d) {
|
|
return 1
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func X__isfinite(tls *TLS, d float64) int32 {
|
|
if !math.IsInf(d, 0) && !math.IsNaN(d) {
|
|
return 1
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func X__isfinitel(tls *TLS, d float64) int32 {
|
|
if !math.IsInf(d, 0) && !math.IsNaN(d) {
|
|
return 1
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
func strlen(s uintptr) (r Tsize_t) {
|
|
if s == 0 {
|
|
return 0
|
|
}
|
|
|
|
for ; *(*int8)(unsafe.Pointer(s)) != 0; s++ {
|
|
r++
|
|
}
|
|
|
|
return r
|
|
}
|
|
|
|
// size_t strlen(const char *s)
|
|
func Xstrlen(t *TLS, s uintptr) (r Tsize_t) {
|
|
if __ccgo_strace {
|
|
trc("t=%v s=%v, (%v:)", t, s, origin(2))
|
|
defer func() { trc("-> %v", r) }()
|
|
}
|
|
return strlen(s)
|
|
|
|
}
|
|
|
|
func _strlen(t *TLS, s uintptr) (r Tsize_t) {
|
|
return strlen(s)
|
|
}
|