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// 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)
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
}
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