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Upstream-Status: Backport [see text]
https://github.com/golong/go.git as of commit 22c1d18a27...
Copy src/internal/godebug from go 1.19 since it does not
exist in 1.17.
Signed-off-by: Joe Slater <joe.slater@windriver.com>
---
--- /dev/null
+++ go/src/internal/godebug/godebug.go
@@ -0,0 +1,34 @@
+// Copyright 2021 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 godebug parses the GODEBUG environment variable.
+package godebug
+
+import "os"
+
+// Get returns the value for the provided GODEBUG key.
+func Get(key string) string {
+ return get(os.Getenv("GODEBUG"), key)
+}
+
+// get returns the value part of key=value in s (a GODEBUG value).
+func get(s, key string) string {
+ for i := 0; i < len(s)-len(key)-1; i++ {
+ if i > 0 && s[i-1] != ',' {
+ continue
+ }
+ afterKey := s[i+len(key):]
+ if afterKey[0] != '=' || s[i:i+len(key)] != key {
+ continue
+ }
+ val := afterKey[1:]
+ for i, b := range val {
+ if b == ',' {
+ return val[:i]
+ }
+ }
+ return val
+ }
+ return ""
+}
--- /dev/null
+++ go/src/internal/godebug/godebug_test.go
@@ -0,0 +1,34 @@
+// Copyright 2021 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 godebug
+
+import "testing"
+
+func TestGet(t *testing.T) {
+ tests := []struct {
+ godebug string
+ key string
+ want string
+ }{
+ {"", "", ""},
+ {"", "foo", ""},
+ {"foo=bar", "foo", "bar"},
+ {"foo=bar,after=x", "foo", "bar"},
+ {"before=x,foo=bar,after=x", "foo", "bar"},
+ {"before=x,foo=bar", "foo", "bar"},
+ {",,,foo=bar,,,", "foo", "bar"},
+ {"foodecoy=wrong,foo=bar", "foo", "bar"},
+ {"foo=", "foo", ""},
+ {"foo", "foo", ""},
+ {",foo", "foo", ""},
+ {"foo=bar,baz", "loooooooong", ""},
+ }
+ for _, tt := range tests {
+ got := get(tt.godebug, tt.key)
+ if got != tt.want {
+ t.Errorf("get(%q, %q) = %q; want %q", tt.godebug, tt.key, got, tt.want)
+ }
+ }
+}
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