Adding upstream version 1.65.7.

Signed-off-by: Daniel Baumann <daniel@debian.org>

etc_musl.go

@@ -0,0 +1,69 @@
+// Copyright 2023 The Libc Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && (amd64 || arm64 || loong64 || ppc64le || s390x || riscv64 || 386 || arm)
+
+package libc // import "modernc.org/libc"
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+// origin returns caller's short position, skipping skip frames.
+func origin(skip int) string {
+	pc, fn, fl, _ := runtime.Caller(skip)
+	f := runtime.FuncForPC(pc)
+	var fns string
+	if f != nil {
+		fns = f.Name()
+		if x := strings.LastIndex(fns, "."); x > 0 {
+			fns = fns[x+1:]
+		}
+		if strings.HasPrefix(fns, "func") {
+			num := true
+			for _, c := range fns[len("func"):] {
+				if c < '0' || c > '9' {
+					num = false
+					break
+				}
+			}
+			if num {
+				return origin(skip + 2)
+			}
+		}
+	}
+	return fmt.Sprintf("%s:%d:%s", filepath.Base(fn), fl, fns)
+}
+
+// todo prints and return caller's position and an optional message tagged with TODO. Output goes to stderr.
+func todo(s string, args ...interface{}) string {
+	switch {
+	case s == "":
+		s = fmt.Sprintf(strings.Repeat("%v ", len(args)), args...)
+	default:
+		s = fmt.Sprintf(s, args...)
+	}
+	r := fmt.Sprintf("%s\n\tTODO %s", origin(2), s)
+	// fmt.Fprintf(os.Stderr, "%s\n", r)
+	// os.Stdout.Sync()
+	return r
+}
+
+// trc prints and return caller's position and an optional message tagged with TRC. Output goes to stderr.
+func trc(s string, args ...interface{}) string {
+	switch {
+	case s == "":
+		s = fmt.Sprintf(strings.Repeat("%v ", len(args)), args...)
+	default:
+		s = fmt.Sprintf(s, args...)
+	}
+	r := fmt.Sprintf("%s: TRC %s", origin(2), s)
+	fmt.Fprintf(os.Stderr, "%s\n", r)
+	os.Stderr.Sync()
+	return r
+}