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// 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 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 ""
}
var _cgo_setenv unsafe.Pointer // pointer to C function
var _cgo_unsetenv unsafe.Pointer // pointer to C function
// Update the C environment if cgo is loaded.
// Called from syscall.Setenv.
func syscall_setenv_c(k string, v string) {
if _cgo_setenv == nil {
return
}
arg := [2]unsafe.Pointer{cstring(k), cstring(v)}
asmcgocall(unsafe.Pointer(_cgo_setenv), unsafe.Pointer(&arg))
}
// Update the C environment if cgo is loaded.
// Called from syscall.unsetenv.
func syscall_unsetenv_c(k string) {
if _cgo_unsetenv == nil {
return
}
arg := [1]unsafe.Pointer{cstring(k)}
asmcgocall(unsafe.Pointer(_cgo_unsetenv), unsafe.Pointer(&arg))
}
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])
}
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