Adding upstream version 1.37.0.

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

dmesg.go

@@ -0,0 +1,56 @@
+// Copyright 2023 The Sqlite 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 sqlite.dmesg
+// +build sqlite.dmesg
+
+package sqlite // import "modernc.org/sqlite"
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+const dmesgs = true
+
+var (
+	pid  = fmt.Sprintf("[%v %v] ", os.Getpid(), filepath.Base(os.Args[0]))
+	logf *os.File
+)
+
+func init() {
+	t := time.Now()
+	// 01/02 03:04:05PM '06 -0700
+	dn := t.Format("sqlite-dmesg-2006-01-02-03-150405")
+	dn = filepath.Join(os.TempDir(), fmt.Sprintf("%s.%d", dn, os.Getpid()))
+	if err := os.Mkdir(dn, 0770); err != nil {
+		panic(err.Error())
+	}
+
+	fn := filepath.Join(dn, "dmesg.log")
+	var err error
+	if logf, err = os.OpenFile(fn, os.O_APPEND|os.O_CREATE|os.O_WRONLY|os.O_SYNC, 0644); err != nil {
+		panic(err.Error())
+	}
+
+	dmesg("%v", time.Now())
+	fmt.Fprintf(os.Stderr, "debug messages in %s\n", fn)
+}
+
+func dmesg(s string, args ...interface{}) {
+	if s == "" {
+		s = strings.Repeat("%v ", len(args))
+	}
+	s = fmt.Sprintf(pid+s, args...)
+	s += fmt.Sprintf(" (%v: %v:)", origin(3), origin(2))
+	switch {
+	case len(s) != 0 && s[len(s)-1] == '\n':
+		fmt.Fprint(logf, s)
+	default:
+		fmt.Fprintln(logf, s)
+	}
+}