library: os.ProcessState.String

internal/lib/os/exec_posix.go

@@ -7,8 +7,10 @@
 package os
 
 import (
+	"runtime"
 	"syscall"
 
+	"github.com/goplus/llgo/internal/lib/internal/itoa"
 	"github.com/goplus/llgo/internal/lib/internal/syscall/execenv"
 )
 
@@ -96,7 +98,6 @@ func (p *ProcessState) sysUsage() any {
 }
 
 func (p *ProcessState) String() string {
-	/* TODO(xsw):
 	if p == nil {
 		return "<nil>"
 	}
@@ -124,8 +125,6 @@ func (p *ProcessState) String() string {
 		res += " (core dumped)"
 	}
 	return res
-	*/
-	panic("todo: os.ProcessState.String")
 }
 
 // ExitCode returns the exit code of the exited process, or -1

internal/lib/os/str.go

@@ -0,0 +1,39 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Simple conversions to avoid depending on strconv.
+
+package os
+
+// itox converts val (an int) to a hexadecimal string.
+func itox(val int) string {
+	if val < 0 {
+		return "-" + uitox(uint(-val))
+	}
+	return uitox(uint(val))
+}
+
+const hex = "0123456789abcdef"
+
+// uitox converts val (a uint) to a hexadecimal string.
+func uitox(val uint) string {
+	if val == 0 { // avoid string allocation
+		return "0x0"
+	}
+	var buf [20]byte // big enough for 64bit value base 16 + 0x
+	i := len(buf) - 1
+	for val >= 16 {
+		q := val / 16
+		buf[i] = hex[val%16]
+		i--
+		val = q
+	}
+	// val < 16
+	buf[i] = hex[val%16]
+	i--
+	buf[i] = 'x'
+	i--
+	buf[i] = '0'
+	return string(buf[i:])
+}