77 lines
3.3 KiB
Racket
77 lines
3.3 KiB
Racket
;; Copyright (c) 2009-2013 Derick Eddington. All rights reserved.
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;; Permission is hereby granted, free of charge, to any person obtaining a
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;; copy of this software and associated documentation files (the "Software"),
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;; to deal in the Software without restriction, including without limitation
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;; the rights to use, copy, modify, merge, publish, distribute, sublicense,
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;; and/or sell copies of the Software, and to permit persons to whom the
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;; Software is furnished to do so, subject to the following conditions:
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;; The above copyright notice and this permission notice shall be included in
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;; all copies or substantial portions of the Software.
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;; Except as contained in this notice, the name(s) of the above copyright
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;; holders shall not be used in advertising or otherwise to promote the sale,
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;; use or other dealings in this Software without prior written authorization.
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;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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;; THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;; DEALINGS IN THE SOFTWARE.
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;; Inspired by Danny Yoo's get-environment PLaneT package.
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#lang scheme/base
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(require scheme/foreign)
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(provide (rename-out (getenv get-environment-variable))
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get-environment-variables)
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(unsafe!)
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(define (get-environment-variables)
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(define (split-strings l)
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(for/list ([next (in-list l)])
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(let loop ((i 0) (len (string-length next)))
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(if (< i len)
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(if (char=? #\= (string-ref next i))
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(cons (substring next 0 i)
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(substring next (+ 1 i) len))
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(loop (+ 1 i) len))
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(cons next #f)))))
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(case (system-type)
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[(windows)
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(let ([get (get-ffi-obj "GetEnvironmentStringsW" #f (_fun #:abi 'stdcall -> _bytes))]
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[free (get-ffi-obj "FreeEnvironmentStringsW" #f (_fun #:abi 'stdcall _pointer -> _void))])
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(let* ([strs (get)]
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[len (let loop ([i 0])
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(if (and (= 0 (ptr-ref strs _byte i))
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(= 0 (ptr-ref strs _byte (+ i 1)))
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(= 0 (ptr-ref strs _byte (+ i 2)))
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(= 0 (ptr-ref strs _byte (+ i 3))))
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(+ i 4)
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(loop (+ i 2))))]
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[strs (cast strs _pointer (_bytes o len))])
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(begin0
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(split-strings
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(let loop ([pos 0])
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(let ([m (regexp-match-positions #rx"(?:..)*?\0\0" strs pos)])
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(if m
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(if (= (cdar m) (+ pos 2))
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null
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(cons (cast (ptr-add strs pos) _pointer _string/utf-16)
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(loop (cdar m))))
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null))))
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(free strs))))]
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[else
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(let ([environ (get-ffi-obj "environ" (ffi-lib #f) _pointer)])
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(split-strings
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(let loop ([i 0])
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(let ((next (ptr-ref environ _string/locale i)))
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(if next
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(cons next (loop (+ 1 i)))
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null)))))]))
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