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