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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module os
fn C.getenv(&char) &char
// C.GetEnvironmentStringsW & C.FreeEnvironmentStringsW are defined only on windows
fn C.GetEnvironmentStringsW() &u16
fn C.FreeEnvironmentStringsW(&u16) int
// `getenv` returns the value of the environment variable named by the key.
pub fn getenv(key string) string {
unsafe {
$if windows {
s := C._wgetenv(key.to_wide())
if s == 0 {
return ''
}
return string_from_wide(s)
} $else {
s := C.getenv(&char(key.str))
if s == voidptr(0) {
return ''
}
// NB: C.getenv *requires* that the result be copied.
return cstring_to_vstring(s)
}
}
}
// os.setenv sets the value of an environment variable with `name` to `value`.
pub fn setenv(name string, value string, overwrite bool) int {
$if windows {
format := '$name=$value'
if overwrite {
unsafe {
return C._putenv(&char(format.str))
}
} else {
if getenv(name).len == 0 {
unsafe {
return C._putenv(&char(format.str))
}
}
}
return -1
} $else {
unsafe {
return C.setenv(&char(name.str), &char(value.str), overwrite)
}
}
}
// os.unsetenv clears an environment variable with `name`.
pub fn unsetenv(name string) int {
$if windows {
format := '$name='
return C._putenv(&char(format.str))
} $else {
return C.unsetenv(&char(name.str))
}
}
// See: https://linux.die.net/man/5/environ for unix platforms.
// See: https://docs.microsoft.com/bg-bg/windows/win32/api/processenv/nf-processenv-getenvironmentstrings
// os.environ returns a map of all the current environment variables
fn unix_environ() &&char {
// TODO: remove this helper function, when `&&char(C.environ)` works properly
return voidptr(C.environ)
}
pub fn environ() map[string]string {
mut res := map[string]string{}
$if windows {
mut estrings := C.GetEnvironmentStringsW()
mut eline := ''
for c := estrings; *c != 0; {
eline = unsafe { string_from_wide(c) }
eq_index := eline.index_byte(`=`)
if eq_index > 0 {
res[eline[0..eq_index]] = eline[eq_index + 1..]
}
unsafe {
c = c + eline.len + 1
}
}
C.FreeEnvironmentStringsW(estrings)
} $else {
start := unix_environ()
mut i := 0
for {
x := unsafe { start[i] }
if x == 0 {
break
}
eline := unsafe { cstring_to_vstring(x) }
eq_index := eline.index_byte(`=`)
if eq_index > 0 {
res[eline[0..eq_index]] = eline[eq_index + 1..]
}
i++
}
}
return res
}
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