27d6b51071
Patch by Svante Signell.
Reviewed-on: https://go-review.googlesource.com/c/160822
From-SVN: r268459
44 lines
1.0 KiB
Go
44 lines
1.0 KiB
Go
// Copyright 2012 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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// +build aix darwin dragonfly freebsd hurd js,wasm linux nacl netbsd openbsd solaris windows
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package runtime
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func gogetenv(key string) string {
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env := environ()
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if env == nil {
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throw("getenv before env init")
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}
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for _, s := range env {
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if len(s) > len(key) && s[len(key)] == '=' && envKeyEqual(s[:len(key)], key) {
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return s[len(key)+1:]
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}
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}
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return ""
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}
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// envKeyEqual reports whether a == b, with ASCII-only case insensitivity
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// on Windows. The two strings must have the same length.
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func envKeyEqual(a, b string) bool {
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if GOOS == "windows" { // case insensitive
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for i := 0; i < len(a); i++ {
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ca, cb := a[i], b[i]
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if ca == cb || lowerASCII(ca) == lowerASCII(cb) {
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continue
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}
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return false
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}
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return true
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}
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return a == b
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}
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func lowerASCII(c byte) byte {
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if 'A' <= c && c <= 'Z' {
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return c + ('a' - 'A')
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}
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return c
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}
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