Kyle Isom
c13c868e77
Vendor dependencies and expose mcproxyctl binary via nix build. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
123 lines
2.5 KiB
Go
123 lines
2.5 KiB
Go
// Copyright 2024 The Libc Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package libc is a partial reimplementation of C libc in pure Go.
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package libc // import "modernc.org/libc"
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import (
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"math"
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"sync/atomic"
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"unsafe"
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)
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type integer interface {
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~int | ~int32 | ~int64 | ~uint | ~uint32 | ~uint64 | ~uintptr
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}
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func X__sync_add_and_fetch[T integer](t *TLS, p uintptr, v T) T {
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switch unsafe.Sizeof(v) {
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case 4:
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return T(atomic.AddInt32((*int32)(unsafe.Pointer(p)), int32(v)))
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case 8:
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return T(atomic.AddInt64((*int64)(unsafe.Pointer(p)), int64(v)))
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default:
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panic(todo(""))
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}
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}
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func X__sync_sub_and_fetch[T integer](t *TLS, p uintptr, v T) T {
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switch unsafe.Sizeof(v) {
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case 4:
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return T(atomic.AddInt32((*int32)(unsafe.Pointer(p)), -int32(v)))
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case 8:
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return T(atomic.AddInt64((*int64)(unsafe.Pointer(p)), -int64(v)))
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default:
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panic(todo(""))
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}
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}
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// GoString returns the value of a C string at s.
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func GoString(s uintptr) string {
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if s == 0 {
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return ""
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}
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if n := strlen(s); n != 0 {
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return string(unsafe.Slice((*byte)(unsafe.Pointer(s)), n))
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}
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return ""
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}
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// GoBytes returns a byte slice from a C char* having length len bytes.
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func GoBytes(s uintptr, len int) []byte {
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return unsafe.Slice((*byte)(unsafe.Pointer(s)), len)
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}
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func X__isfinitef(tls *TLS, f float32) int32 {
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d := float64(f)
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if !math.IsInf(d, 0) && !math.IsNaN(d) {
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return 1
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}
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return 0
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}
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func X__isfinite(tls *TLS, d float64) int32 {
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if !math.IsInf(d, 0) && !math.IsNaN(d) {
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return 1
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}
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return 0
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}
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func X__isfinitel(tls *TLS, d float64) int32 {
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if !math.IsInf(d, 0) && !math.IsNaN(d) {
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return 1
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}
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return 0
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}
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func strlen(s uintptr) (r Tsize_t) {
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if s == 0 {
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return 0
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}
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for ; *(*int8)(unsafe.Pointer(s)) != 0; s++ {
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r++
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}
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return r
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}
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// size_t strlen(const char *s)
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func Xstrlen(t *TLS, s uintptr) (r Tsize_t) {
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if __ccgo_strace {
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trc("t=%v s=%v, (%v:)", t, s, origin(2))
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defer func() { trc("-> %v", r) }()
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}
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return strlen(s)
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}
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func _strlen(t *TLS, s uintptr) (r Tsize_t) {
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return strlen(s)
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}
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func X__builtin_ilogb(tls *TLS, x float64) int32 {
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return int32(math.Ilogb(x))
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}
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func X__builtin_ilogbl(tls *TLS, x float64) int32 {
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return int32(math.Ilogb(x))
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}
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func X__builtin_ilogbf(tls *TLS, x float32) int32 {
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// Casting to float64 is safe and mathematically correct here.
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// Subnormal float32 values become normal float64 values,
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// which allows math.Ilogb to correctly return their negative exponent.
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return int32(math.Ilogb(float64(x)))
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}
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