mirror of
https://github.com/golang/go
synced 2024-11-23 00:50:05 -07:00
85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package Platform
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import IO "io"
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import OS "os"
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import Utils "utils"
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// ----------------------------------------------------------------------------
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// Environment
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var
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GOARCH,
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GOOS,
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GOROOT,
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USER string;
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func init() {
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var e *OS.Error;
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GOARCH, e = OS.Getenv("GOARCH");
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GOOS, e = OS.Getenv("GOOS");
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GOROOT, e = OS.Getenv("GOROOT");
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USER, e = OS.Getenv("USER");
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}
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// ----------------------------------------------------------------------------
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// I/O
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const (
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MAGIC_obj_file = "@gri-go.7@v0"; // make it clear that it cannot be a source file
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Src_file_ext = ".go";
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Obj_file_ext = ".7";
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)
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func readfile(filename string) (string, *OS.Error) {
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fd, err := OS.Open(filename, OS.O_RDONLY, 0);
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if err != nil {
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return "", err;
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}
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var buf [1<<20]byte;
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n, err1 := IO.Readn(fd, buf);
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fd.Close();
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if err1 == IO.ErrEOF {
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err1 = nil;
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}
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return string(buf[0:n]), err1;
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}
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func writefile(name, data string) *OS.Error {
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fd, err := OS.Open(name, OS.O_WRONLY, 0);
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if err != nil {
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return err;
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}
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n, err1 := IO.WriteString(fd, data);
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fd.Close();
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return err1;
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}
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func ReadObjectFile(filename string) (string, bool) {
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data, err := readfile(filename + Obj_file_ext);
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magic := MAGIC_obj_file; // TODO remove once len(constant) works
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if err == nil && len(data) >= len(magic) && data[0 : len(magic)] == magic {
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return data, true;
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}
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return "", false;
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}
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func ReadSourceFile(name string) (string, bool) {
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name = Utils.TrimExt(name, Src_file_ext) + Src_file_ext;
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data, err := readfile(name);
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return data, err == nil;
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}
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func WriteObjectFile(name string, data string) bool {
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name = Utils.TrimExt(Utils.BaseName(name), Src_file_ext) + Obj_file_ext;
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return writefile(name, data) != nil;
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}
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