subsonic-tui/vendor/github.com/ebitengine/purego/internal/strings/strings.go
Sagi Dayan 26e526f07e
initial commit
Signed-off-by: Sagi Dayan <sagidayan@gmail.com>
2024-02-20 19:10:14 +02:00

40 lines
1,001 B
Go

// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
package strings
import (
"unsafe"
)
// hasSuffix tests whether the string s ends with suffix.
func hasSuffix(s, suffix string) bool {
return len(s) >= len(suffix) && s[len(s)-len(suffix):] == suffix
}
// CString converts a go string to *byte that can be passed to C code.
func CString(name string) *byte {
if hasSuffix(name, "\x00") {
return &(*(*[]byte)(unsafe.Pointer(&name)))[0]
}
b := make([]byte, len(name)+1)
copy(b, name)
return &b[0]
}
// GoString copies a null-terminated char* to a Go string.
func GoString(c uintptr) string {
// We take the address and then dereference it to trick go vet from creating a possible misuse of unsafe.Pointer
ptr := *(*unsafe.Pointer)(unsafe.Pointer(&c))
if ptr == nil {
return ""
}
var length int
for {
if *(*byte)(unsafe.Add(ptr, uintptr(length))) == '\x00' {
break
}
length++
}
return string(unsafe.Slice((*byte)(ptr), length))
}