chore: vendor go dependencies

1 files changed, 40 insertions, 0 deletions

diff --git a/vendor/github.com/ebitengine/purego/internal/strings/strings.go b/vendor/github.com/ebitengine/purego/internal/strings/strings.go
new file mode 100644
index 0000000..5b0d252
--- /dev/null
+++ b/vendor/github.com/ebitengine/purego/internal/strings/strings.go
@@ -0,0 +1,40 @@
+// 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))
+}