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c7d5b8c83d
* Update osenv.nim * Update win_setenv.nim * Update lib/pure/includes/osenv.nim * Update lib/pure/includes/osenv.nim * fixing cstring Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
97 lines
3.8 KiB
Nim
97 lines
3.8 KiB
Nim
#[
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Copyright (c) Facebook, Inc. and its affiliates.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Adapted `setenv` from https://github.com/facebook/folly/blob/master/folly/portability/Stdlib.cpp
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translated from C to nim.
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]#
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#[
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Introduced in https://github.com/facebook/folly/commit/5d8ca09a3f96afefb44e35808f03651a096ab9c7
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TODO:
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check errno_t vs cint
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]#
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when not defined(windows): discard
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else:
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type wchar_t {.importc: "wchar_t".} = int16
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proc setEnvironmentVariableA*(lpName, lpValue: cstring): int32 {.
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stdcall, dynlib: "kernel32", importc: "SetEnvironmentVariableA", sideEffect.}
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# same as winlean.setEnvironmentVariableA
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proc c_getenv(env: cstring): cstring {.importc: "getenv", header: "<stdlib.h>".}
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proc c_putenv(envstring: cstring): cint {.importc: "_putenv", header: "<stdlib.h>".}
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proc c_wgetenv(varname: ptr wchar_t): ptr wchar_t {.importc: "_wgetenv", header: "<stdlib.h>".}
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var errno {.importc, header: "<errno.h>".}: cint
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var gWenviron {.importc: "_wenviron".}: ptr ptr wchar_t
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# xxx `ptr UncheckedArray[WideCString]` did not work
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proc mbstowcs(wcstr: ptr wchar_t, mbstr: cstring, count: csize_t): csize_t {.importc: "mbstowcs", header: "<stdlib.h>".}
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# xxx cint vs errno_t?
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proc setEnvImpl*(name: string, value: string, overwrite: cint): cint =
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const EINVAL = cint(22)
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if overwrite == 0 and c_getenv(cstring(name)) != nil: return 0
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if value != "":
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let envstring = name & "=" & value
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let e = c_putenv(cstring(envstring))
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if e != 0:
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errno = EINVAL
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return -1
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return 0
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#[
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We are trying to set the value to an empty string, but `_putenv` deletes
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entries if the value is an empty string, and just calling
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SetEnvironmentVariableA doesn't update `_environ`,
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so we have to do these terrible things.
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]#
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let envstring = name & "= "
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if c_putenv(cstring(envstring)) != 0:
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errno = EINVAL
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return -1
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# Here lies the documentation we blatently ignore to make this work.
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var s = c_getenv(cstring(name))
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s[0] = '\0'
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#[
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This would result in a double null termination, which normally signifies the
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end of the environment variable list, so we stick a completely empty
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environment variable into the list instead.
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]#
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s = c_getenv(cstring(name))
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s[1] = '='
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#[
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If gWenviron is null, the wide environment has not been initialized
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yet, and we don't need to try to update it. We have to do this otherwise
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we'd be forcing the initialization and maintenance of the wide environment
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even though it's never actually used in most programs.
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]#
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if gWenviron != nil:
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# var buf: array[MAX_ENV + 1, WideCString]
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let requiredSize = mbstowcs(nil, cstring(name), 0).int
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var buf = newSeq[Utf16Char](requiredSize + 1)
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let buf2 = cast[ptr wchar_t](buf[0].addr)
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if mbstowcs(buf2, cstring(name), csize_t(requiredSize + 1)) == csize_t(high(uint)):
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errno = EINVAL
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return -1
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var ptrToEnv = cast[WideCString](c_wgetenv(buf2))
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ptrToEnv[0] = '\0'.Utf16Char
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ptrToEnv = cast[WideCString](c_wgetenv(buf2))
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ptrToEnv[1] = '='.Utf16Char
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# And now, we have to update the outer environment to have a proper empty value.
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if setEnvironmentVariableA(cstring(name), cstring(value)) == 0:
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errno = EINVAL
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return -1
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return 0
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