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comparison vendor/golang.org/x/sys/unix/syscall.go @ 66:787b5ee0289d draft

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Use vendored modules Signed-off-by: Izuru Yakumo <yakumo.izuru@chaotic.ninja>
author yakumo.izuru
date Sun, 23 Jul 2023 13:18:53 +0000
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children 4b79810863f6
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65:6d985efa0f7a 66:787b5ee0289d
1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 //go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
6 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
7
8 // Package unix contains an interface to the low-level operating system
9 // primitives. OS details vary depending on the underlying system, and
10 // by default, godoc will display OS-specific documentation for the current
11 // system. If you want godoc to display OS documentation for another
12 // system, set $GOOS and $GOARCH to the desired system. For example, if
13 // you want to view documentation for freebsd/arm on linux/amd64, set $GOOS
14 // to freebsd and $GOARCH to arm.
15 //
16 // The primary use of this package is inside other packages that provide a more
17 // portable interface to the system, such as "os", "time" and "net". Use
18 // those packages rather than this one if you can.
19 //
20 // For details of the functions and data types in this package consult
21 // the manuals for the appropriate operating system.
22 //
23 // These calls return err == nil to indicate success; otherwise
24 // err represents an operating system error describing the failure and
25 // holds a value of type syscall.Errno.
26 package unix // import "golang.org/x/sys/unix"
27
28 import (
29 "bytes"
30 "strings"
31 "unsafe"
32
33 "golang.org/x/sys/internal/unsafeheader"
34 )
35
36 // ByteSliceFromString returns a NUL-terminated slice of bytes
37 // containing the text of s. If s contains a NUL byte at any
38 // location, it returns (nil, EINVAL).
39 func ByteSliceFromString(s string) ([]byte, error) {
40 if strings.IndexByte(s, 0) != -1 {
41 return nil, EINVAL
42 }
43 a := make([]byte, len(s)+1)
44 copy(a, s)
45 return a, nil
46 }
47
48 // BytePtrFromString returns a pointer to a NUL-terminated array of
49 // bytes containing the text of s. If s contains a NUL byte at any
50 // location, it returns (nil, EINVAL).
51 func BytePtrFromString(s string) (*byte, error) {
52 a, err := ByteSliceFromString(s)
53 if err != nil {
54 return nil, err
55 }
56 return &a[0], nil
57 }
58
59 // ByteSliceToString returns a string form of the text represented by the slice s, with a terminating NUL and any
60 // bytes after the NUL removed.
61 func ByteSliceToString(s []byte) string {
62 if i := bytes.IndexByte(s, 0); i != -1 {
63 s = s[:i]
64 }
65 return string(s)
66 }
67
68 // BytePtrToString takes a pointer to a sequence of text and returns the corresponding string.
69 // If the pointer is nil, it returns the empty string. It assumes that the text sequence is terminated
70 // at a zero byte; if the zero byte is not present, the program may crash.
71 func BytePtrToString(p *byte) string {
72 if p == nil {
73 return ""
74 }
75 if *p == 0 {
76 return ""
77 }
78
79 // Find NUL terminator.
80 n := 0
81 for ptr := unsafe.Pointer(p); *(*byte)(ptr) != 0; n++ {
82 ptr = unsafe.Pointer(uintptr(ptr) + 1)
83 }
84
85 var s []byte
86 h := (*unsafeheader.Slice)(unsafe.Pointer(&s))
87 h.Data = unsafe.Pointer(p)
88 h.Len = n
89 h.Cap = n
90
91 return string(s)
92 }
93
94 // Single-word zero for use when we need a valid pointer to 0 bytes.
95 var _zero uintptr