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add os.Getenv()

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R=rsc
DELTA=51  (50 added, 0 deleted, 1 changed)
OCL=15665
CL=15667
This commit is contained in:
Rob Pike 2008-09-22 17:31:41 -07:00
parent 4332e0a546
commit 4d12c0e170
3 changed files with 56 additions and 1 deletions
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3
src/lib/os/Makefile
View File

@ -3,7 +3,7 @@
# license that can be found in the LICENSE file.
# DO NOT EDIT. Automatically generated by gobuild.
# gobuild -m os os_error.go os_file.go os_time.go
# gobuild -m os os_error.go os_file.go os_time.go os_env.go
O=6
GC=$(O)g
CC=$(O)c -w
@ -36,6 +36,7 @@ O1=\
O2=\
os_file.$O\
os_time.$O\
os_env.$O\
$(PKG): a1 a2
a1: $(O1)

28
src/lib/os/os_env.go Normal file
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@ -0,0 +1,28 @@
// 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.
// Environment variables.
// Setenv doesn't exist yet: don't have the run-time hooks yet
package os
import os "os"
export var (
ENOENV = NewError("no such environment variable");
)
export func Getenv(s string) (v string, err *Error) {
n := len(s);
if n == 0 {
return "", EINVAL
}
for i := 0; i < sys.envc(); i++ {
e := sys.envv(i);
if len(e) > n && e[n] == '=' && e[0 : n] == s {
return e[n+1 : len(e)], nil
}
}
return "", ENOENV
}

26
test/env.go Normal file
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@ -0,0 +1,26 @@
// $G $F.go && $L $F.$A && ./$A.out
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import os "os"
func main() {
ga, e0 := os.Getenv("GOARCH");
if e0 != nil {
print("$GOARCH: ", e0.String(), "\n");
sys.exit(1);
}
if ga != "amd64" {
print("$GOARCH=", ga, "\n");
sys.exit(1);
}
xxx, e1 := os.Getenv("DOES_NOT_EXIST");
if e1 != os.ENOENV {
print("$DOES_NOT_EXIST=", xxx, "; err = ", e1.String(), "\n");
sys.exit(1);
}
}