41 lines
1,001 B
Go
41 lines
1,001 B
Go
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// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
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package strings
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import (
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"unsafe"
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)
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// hasSuffix tests whether the string s ends with suffix.
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func hasSuffix(s, suffix string) bool {
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return len(s) >= len(suffix) && s[len(s)-len(suffix):] == suffix
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}
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// CString converts a go string to *byte that can be passed to C code.
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func CString(name string) *byte {
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if hasSuffix(name, "\x00") {
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return &(*(*[]byte)(unsafe.Pointer(&name)))[0]
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}
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b := make([]byte, len(name)+1)
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copy(b, name)
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return &b[0]
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}
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// GoString copies a null-terminated char* to a Go string.
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func GoString(c uintptr) string {
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// We take the address and then dereference it to trick go vet from creating a possible misuse of unsafe.Pointer
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ptr := *(*unsafe.Pointer)(unsafe.Pointer(&c))
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if ptr == nil {
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return ""
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}
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var length int
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for {
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if *(*byte)(unsafe.Add(ptr, uintptr(length))) == '\x00' {
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break
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}
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length++
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}
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return string(unsafe.Slice((*byte)(ptr), length))
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}
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