Gibheer
fa05045d31
This is the import from the separate monfront repository. The history could not be imported, but this should suffice.
96 lines
3.0 KiB
Go
96 lines
3.0 KiB
Go
// Copyright 2009 The Go 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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//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
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// Package unix contains an interface to the low-level operating system
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// primitives. OS details vary depending on the underlying system, and
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// by default, godoc will display OS-specific documentation for the current
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// system. If you want godoc to display OS documentation for another
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// system, set $GOOS and $GOARCH to the desired system. For example, if
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// you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
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// to freebsd and $GOARCH to arm.
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//
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// The primary use of this package is inside other packages that provide a more
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// portable interface to the system, such as "os", "time" and "net". Use
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// those packages rather than this one if you can.
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//
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// For details of the functions and data types in this package consult
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// the manuals for the appropriate operating system.
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//
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// These calls return err == nil to indicate success; otherwise
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// err represents an operating system error describing the failure and
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// holds a value of type syscall.Errno.
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package unix // import "golang.org/x/sys/unix"
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import (
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"bytes"
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"strings"
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"unsafe"
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"golang.org/x/sys/internal/unsafeheader"
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)
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// ByteSliceFromString returns a NUL-terminated slice of bytes
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// containing the text of s. If s contains a NUL byte at any
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// location, it returns (nil, EINVAL).
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func ByteSliceFromString(s string) ([]byte, error) {
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if strings.IndexByte(s, 0) != -1 {
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return nil, EINVAL
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}
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a := make([]byte, len(s)+1)
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copy(a, s)
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return a, nil
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}
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// BytePtrFromString returns a pointer to a NUL-terminated array of
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// bytes containing the text of s. If s contains a NUL byte at any
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// location, it returns (nil, EINVAL).
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func BytePtrFromString(s string) (*byte, error) {
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a, err := ByteSliceFromString(s)
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if err != nil {
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return nil, err
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}
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return &a[0], nil
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}
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// ByteSliceToString returns a string form of the text represented by the slice s, with a terminating NUL and any
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// bytes after the NUL removed.
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func ByteSliceToString(s []byte) string {
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if i := bytes.IndexByte(s, 0); i != -1 {
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s = s[:i]
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}
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return string(s)
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}
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// BytePtrToString takes a pointer to a sequence of text and returns the corresponding string.
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// If the pointer is nil, it returns the empty string. It assumes that the text sequence is terminated
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// at a zero byte; if the zero byte is not present, the program may crash.
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func BytePtrToString(p *byte) string {
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if p == nil {
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return ""
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}
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if *p == 0 {
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return ""
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}
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// Find NUL terminator.
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n := 0
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for ptr := unsafe.Pointer(p); *(*byte)(ptr) != 0; n++ {
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ptr = unsafe.Pointer(uintptr(ptr) + 1)
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}
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var s []byte
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h := (*unsafeheader.Slice)(unsafe.Pointer(&s))
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h.Data = unsafe.Pointer(p)
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h.Len = n
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h.Cap = n
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return string(s)
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}
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// Single-word zero for use when we need a valid pointer to 0 bytes.
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var _zero uintptr
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