// Copyright 2012 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. // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris windows package runtime import "unsafe" func environ() []string func getenv(s *byte) *byte { val := gogetenv(gostringnocopy(s)) if val == "" { return nil } // Strings found in environment are NUL-terminated. return &bytes(val)[0] } func gogetenv(key string) string { env := environ() if env == nil { gothrow("getenv before env init") } for _, s := range environ() { if len(s) > len(key) && s[len(key)] == '=' && s[:len(key)] == key { return s[len(key)+1:] } } return "" } //extern setenv func _cgo_setenv(unsafe.Pointer, unsafe.Pointer, int32) //extern unsetenv func _cgo_unsetenv(unsafe.Pointer) // Update the C environment if cgo is loaded. // Called from syscall.Setenv. func syscall_setenv_c(k string, v string) { _cgo_setenv(cstring(k), cstring(v), 1) } // Update the C environment if cgo is loaded. // Called from syscall.unsetenv. func syscall_unsetenv_c(k string) { _cgo_unsetenv(cstring(k)) } func cstring(s string) unsafe.Pointer { p := make([]byte, len(s)+1) sp := (*_string)(unsafe.Pointer(&s)) memmove(unsafe.Pointer(&p[0]), unsafe.Pointer(sp.str), uintptr(len(s))) return unsafe.Pointer(&p[0]) }