3 ------------------------------------------------------------------------
4 -- $Id: Main.hs,v 1.53 2004/02/15 12:20:26 panne Exp $
6 -- Program for converting .hsc files to .hs files, by converting the
7 -- file into a C program which is run to generate the Haskell source.
8 -- Certain items known only to the C compiler can then be used in
9 -- the Haskell module; for example #defined constants, byte offsets
10 -- within structures, etc.
12 -- See the documentation in the Users' Guide for more details.
14 #if __GLASGOW_HASKELL__ >= 504 || __NHC__ >= 114
15 import System.Console.GetOpt
20 import System (getProgName, getArgs, ExitCode(..), exitWith, system)
21 import Directory (removeFile,doesFileExist)
22 import Monad (MonadPlus(..), liftM, liftM2, when, unless)
23 import Char (isAlpha, isAlphaNum, isSpace, isDigit, toUpper, intToDigit, ord)
24 import List (intersperse, isSuffixOf)
25 import IO (hPutStr, hPutStrLn, stderr)
27 #if defined(mingw32_HOST_OS)
29 #if __GLASGOW_HASKELL__ >= 504 || __NHC__ >= 114
30 import Foreign.C.String
38 version = "hsc2hs version 0.66\n"
50 | Define String (Maybe String)
54 template_flag :: Flag -> Bool
55 template_flag (Template _) = True
56 template_flag _ = False
58 include :: String -> Flag
59 include s@('\"':_) = Include s
60 include s@('<' :_) = Include s
61 include s = Include ("\""++s++"\"")
63 define :: String -> Flag
64 define s = case break (== '=') s of
65 (name, []) -> Define name Nothing
66 (name, _:value) -> Define name (Just value)
68 options :: [OptDescr Flag]
70 Option ['o'] ["output"] (ReqArg Output "FILE")
71 "name of main output file",
72 Option ['t'] ["template"] (ReqArg Template "FILE")
74 Option ['c'] ["cc"] (ReqArg Compiler "PROG")
76 Option ['l'] ["ld"] (ReqArg Linker "PROG")
78 Option ['C'] ["cflag"] (ReqArg CompFlag "FLAG")
79 "flag to pass to the C compiler",
80 Option ['I'] [] (ReqArg (CompFlag . ("-I"++)) "DIR")
81 "passed to the C compiler",
82 Option ['L'] ["lflag"] (ReqArg LinkFlag "FLAG")
83 "flag to pass to the linker",
84 Option ['i'] ["include"] (ReqArg include "FILE")
85 "as if placed in the source",
86 Option ['D'] ["define"] (ReqArg define "NAME[=VALUE]")
87 "as if placed in the source",
88 Option [] ["no-compile"] (NoArg NoCompile)
89 "stop after writing *_hsc_make.c",
90 Option ['v'] ["verbose"] (NoArg Verbose)
91 "dump commands to stderr",
92 Option ['?'] ["help"] (NoArg Help)
93 "display this help and exit",
94 Option ['V'] ["version"] (NoArg Version)
95 "output version information and exit" ]
100 prog <- getProgramName
101 let header = "Usage: "++prog++" [OPTIONS] INPUT.hsc [...]\n"
103 let (flags, files, errs) = getOpt Permute options args
105 -- If there is no Template flag explicitly specified, try
106 -- to find one by looking near the executable. This only
107 -- works on Win32 (getExecDir). On Unix, there's a wrapper
108 -- script which specifies an explicit template flag.
109 flags_w_tpl <- if any template_flag flags then
112 do mb_path <- getExecDir "/bin/hsc2hs.exe"
117 let templ = path ++ "/template-hsc.h"
118 flg <- doesFileExist templ
120 then return ((Template templ):)
122 return (add_opt flags)
123 case (files, errs) of
125 | any isHelp flags_w_tpl -> bye (usageInfo header options)
126 | any isVersion flags_w_tpl -> bye version
128 isHelp Help = True; isHelp _ = False
129 isVersion Version = True; isVersion _ = False
130 ((_:_), []) -> mapM_ (processFile flags_w_tpl) files
131 (_, _ ) -> die (concat errs ++ usageInfo header options)
133 getProgramName :: IO String
134 getProgramName = liftM (`withoutSuffix` "-bin") getProgName
135 where str `withoutSuffix` suff
136 | suff `isSuffixOf` str = take (length str - length suff) str
139 bye :: String -> IO a
140 bye s = putStr s >> exitWith ExitSuccess
142 die :: String -> IO a
143 die s = hPutStr stderr s >> exitWith (ExitFailure 1)
145 processFile :: [Flag] -> String -> IO ()
146 processFile flags name
147 = do let file_name = dosifyPath name
148 s <- readFile file_name
150 Parser p -> case p (SourcePos file_name 1) s of
151 Success _ _ _ toks -> output flags file_name toks
152 Failure (SourcePos name' line) msg ->
153 die (name'++":"++show line++": "++msg++"\n")
155 ------------------------------------------------------------------------
156 -- A deterministic parser which remembers the text which has been parsed.
158 newtype Parser a = Parser (SourcePos -> String -> ParseResult a)
160 data ParseResult a = Success !SourcePos String String a
161 | Failure !SourcePos String
163 data SourcePos = SourcePos String !Int
165 updatePos :: SourcePos -> Char -> SourcePos
166 updatePos pos@(SourcePos name line) ch = case ch of
167 '\n' -> SourcePos name (line + 1)
170 instance Monad Parser where
171 return a = Parser $ \pos s -> Success pos [] s a
173 Parser $ \pos s -> case m pos s of
174 Success pos' out1 s' a -> case k a of
175 Parser k' -> case k' pos' s' of
176 Success pos'' out2 imp'' b ->
177 Success pos'' (out1++out2) imp'' b
178 Failure pos'' msg -> Failure pos'' msg
179 Failure pos' msg -> Failure pos' msg
180 fail msg = Parser $ \pos _ -> Failure pos msg
182 instance MonadPlus Parser where
184 Parser m `mplus` Parser n =
185 Parser $ \pos s -> case m pos s of
186 success@(Success _ _ _ _) -> success
187 Failure _ _ -> n pos s
189 getPos :: Parser SourcePos
190 getPos = Parser $ \pos s -> Success pos [] s pos
192 setPos :: SourcePos -> Parser ()
193 setPos pos = Parser $ \_ s -> Success pos [] s ()
195 message :: Parser a -> String -> Parser a
196 Parser m `message` msg =
197 Parser $ \pos s -> case m pos s of
198 success@(Success _ _ _ _) -> success
199 Failure pos' _ -> Failure pos' msg
201 catchOutput_ :: Parser a -> Parser String
202 catchOutput_ (Parser m) =
203 Parser $ \pos s -> case m pos s of
204 Success pos' out s' _ -> Success pos' [] s' out
205 Failure pos' msg -> Failure pos' msg
207 fakeOutput :: Parser a -> String -> Parser a
208 Parser m `fakeOutput` out =
209 Parser $ \pos s -> case m pos s of
210 Success pos' _ s' a -> Success pos' out s' a
211 Failure pos' msg -> Failure pos' msg
213 lookAhead :: Parser String
214 lookAhead = Parser $ \pos s -> Success pos [] s s
216 satisfy :: (Char -> Bool) -> Parser Char
218 Parser $ \pos s -> case s of
219 c:cs | p c -> Success (updatePos pos c) [c] cs c
220 _ -> Failure pos "Bad character"
222 char_ :: Char -> Parser ()
224 satisfy (== c) `message` (show c++" expected")
227 anyChar_ :: Parser ()
229 satisfy (const True) `message` "Unexpected end of file"
232 any2Chars_ :: Parser ()
233 any2Chars_ = anyChar_ >> anyChar_
235 many :: Parser a -> Parser [a]
236 many p = many1 p `mplus` return []
238 many1 :: Parser a -> Parser [a]
239 many1 p = liftM2 (:) p (many p)
241 many_ :: Parser a -> Parser ()
242 many_ p = many1_ p `mplus` return ()
244 many1_ :: Parser a -> Parser ()
245 many1_ p = p >> many_ p
247 manySatisfy, manySatisfy1 :: (Char -> Bool) -> Parser String
248 manySatisfy = many . satisfy
249 manySatisfy1 = many1 . satisfy
251 manySatisfy_, manySatisfy1_ :: (Char -> Bool) -> Parser ()
252 manySatisfy_ = many_ . satisfy
253 manySatisfy1_ = many1_ . satisfy
255 ------------------------------------------------------------------------
256 -- Parser of hsc syntax.
259 = Text SourcePos String
260 | Special SourcePos String String
262 parser :: Parser [Token]
265 t <- catchOutput_ text
269 _:_ -> liftM2 (:) (special `fakeOutput` []) parser
270 return (if null t then rest else Text pos t : rest)
277 c:_ | isAlpha c || c == '_' -> do
279 manySatisfy_ (\c' -> isAlphaNum c' || c' == '_' || c' == '\'')
281 c:_ | isHsSymbol c -> do
282 symb <- catchOutput_ (manySatisfy_ isHsSymbol)
285 '-':'-':symb' | all (== '-') symb' -> do
286 return () `fakeOutput` symb
287 manySatisfy_ (/= '\n')
290 return () `fakeOutput` unescapeHashes symb
292 '\"':_ -> do anyChar_; hsString '\"'; text
293 '\'':_ -> do anyChar_; hsString '\''; text
294 '{':'-':_ -> do any2Chars_; linePragma `mplus` hsComment; text
295 _:_ -> do anyChar_; text
297 hsString :: Char -> Parser ()
302 c:_ | c == quote -> anyChar_
307 char_ '\\' `mplus` return ()
309 | otherwise -> do any2Chars_; hsString quote
310 _:_ -> do anyChar_; hsString quote
312 hsComment :: Parser ()
317 '-':'}':_ -> any2Chars_
318 '{':'-':_ -> do any2Chars_; hsComment; hsComment
319 _:_ -> do anyChar_; hsComment
321 linePragma :: Parser ()
325 satisfy (\c -> c == 'L' || c == 'l')
326 satisfy (\c -> c == 'I' || c == 'i')
327 satisfy (\c -> c == 'N' || c == 'n')
328 satisfy (\c -> c == 'E' || c == 'e')
329 manySatisfy1_ isSpace
330 line <- liftM read $ manySatisfy1 isDigit
331 manySatisfy1_ isSpace
333 name <- manySatisfy (/= '\"')
339 setPos (SourcePos name (line - 1))
341 isHsSymbol :: Char -> Bool
342 isHsSymbol '!' = True; isHsSymbol '#' = True; isHsSymbol '$' = True
343 isHsSymbol '%' = True; isHsSymbol '&' = True; isHsSymbol '*' = True
344 isHsSymbol '+' = True; isHsSymbol '.' = True; isHsSymbol '/' = True
345 isHsSymbol '<' = True; isHsSymbol '=' = True; isHsSymbol '>' = True
346 isHsSymbol '?' = True; isHsSymbol '@' = True; isHsSymbol '\\' = True
347 isHsSymbol '^' = True; isHsSymbol '|' = True; isHsSymbol '-' = True
348 isHsSymbol '~' = True
351 unescapeHashes :: String -> String
352 unescapeHashes [] = []
353 unescapeHashes ('#':'#':s) = '#' : unescapeHashes s
354 unescapeHashes (c:s) = c : unescapeHashes s
356 lookAheadC :: Parser String
357 lookAheadC = liftM joinLines lookAhead
360 joinLines ('\\':'\n':s) = joinLines s
361 joinLines (c:s) = c : joinLines s
363 satisfyC :: (Char -> Bool) -> Parser Char
367 '\\':'\n':_ -> do any2Chars_ `fakeOutput` []; satisfyC p
370 charC_ :: Char -> Parser ()
372 satisfyC (== c) `message` (show c++" expected")
375 anyCharC_ :: Parser ()
377 satisfyC (const True) `message` "Unexpected end of file"
380 any2CharsC_ :: Parser ()
381 any2CharsC_ = anyCharC_ >> anyCharC_
383 manySatisfyC :: (Char -> Bool) -> Parser String
384 manySatisfyC = many . satisfyC
386 manySatisfyC_ :: (Char -> Bool) -> Parser ()
387 manySatisfyC_ = many_ . satisfyC
389 special :: Parser Token
391 manySatisfyC_ (\c -> isSpace c && c /= '\n')
396 manySatisfyC_ isSpace
397 sp <- keyArg (== '\n')
400 _ -> keyArg (const False)
402 keyArg :: (Char -> Bool) -> Parser Token
405 key <- keyword `message` "hsc keyword or '{' expected"
406 manySatisfyC_ (\c' -> isSpace c' && c' /= '\n' || eol c')
407 arg <- catchOutput_ (argument eol)
408 return (Special pos key arg)
410 keyword :: Parser String
412 c <- satisfyC (\c' -> isAlpha c' || c' == '_')
413 cs <- manySatisfyC (\c' -> isAlphaNum c' || c' == '_')
416 argument :: (Char -> Bool) -> Parser ()
421 c:_ | eol c -> do anyCharC_; argument eol
423 '\"':_ -> do anyCharC_; cString '\"'; argument eol
424 '\'':_ -> do anyCharC_; cString '\''; argument eol
425 '(':_ -> do anyCharC_; nested ')'; argument eol
427 '/':'*':_ -> do any2CharsC_; cComment; argument eol
429 any2CharsC_; manySatisfyC_ (/= '\n'); argument eol
430 '[':_ -> do anyCharC_; nested ']'; argument eol
432 '{':_ -> do anyCharC_; nested '}'; argument eol
434 _:_ -> do anyCharC_; argument eol
436 nested :: Char -> Parser ()
437 nested c = do argument (== '\n'); charC_ c
439 cComment :: Parser ()
444 '*':'/':_ -> do any2CharsC_
445 _:_ -> do anyCharC_; cComment
447 cString :: Char -> Parser ()
452 c:_ | c == quote -> anyCharC_
453 '\\':_:_ -> do any2CharsC_; cString quote
454 _:_ -> do anyCharC_; cString quote
456 ------------------------------------------------------------------------
457 -- Write the output files.
459 splitName :: String -> (String, String)
461 case break (== '/') name of
462 (file, []) -> ([], file)
463 (dir, sep:rest) -> (dir++sep:restDir, restFile)
465 (restDir, restFile) = splitName rest
467 splitExt :: String -> (String, String)
469 case break (== '.') name of
470 (base, []) -> (base, [])
471 (base, sepRest@(sep:rest))
472 | null restExt -> (base, sepRest)
473 | otherwise -> (base++sep:restBase, restExt)
475 (restBase, restExt) = splitExt rest
477 output :: [Flag] -> String -> [Token] -> IO ()
478 output flags name toks = do
480 (outName, outDir, outBase) <- case [f | Output f <- flags] of
483 last ext == 'c' -> return (dir++base++init ext, dir, base)
484 | ext == ".hs" -> return (dir++base++"_out.hs", dir, base)
485 | otherwise -> return (dir++base++".hs", dir, base)
487 (dir, file) = splitName name
488 (base, ext) = splitExt file
490 (dir, file) = splitName f
491 (base, _) = splitExt file
492 in return (f, dir, base)
493 _ -> onlyOne "output file"
495 let cProgName = outDir++outBase++"_hsc_make.c"
496 oProgName = outDir++outBase++"_hsc_make.o"
497 progName = outDir++outBase++"_hsc_make"
498 #if defined(mingw32_HOST_OS)
499 -- This is a real hack, but the quoting mechanism used for calling the C preprocesseor
500 -- via GHC has changed a few times, so this seems to be the only way... :-P * * *
503 outHFile = outBase++"_hsc.h"
504 outHName = outDir++outHFile
505 outCName = outDir++outBase++"_hsc.c"
507 beVerbose = any (\ x -> case x of { Verbose{} -> True; _ -> False}) flags
510 | null outDir = dosifyPath ("./" ++ progName)
511 | otherwise = progName
513 let specials = [(pos, key, arg) | Special pos key arg <- toks]
515 let needsC = any (\(_, key, _) -> key == "def") specials
518 let includeGuard = map fixChar outHName
520 fixChar c | isAlphaNum c = toUpper c
523 -- try locating GHC..on Win32, look in the vicinity of hsc2hs.
525 mb <- getExecDir "bin/hsc2hs.exe"
527 Nothing -> return def
529 let ghc_path = dosifyPath (x ++ "bin/ghc.exe")
530 flg <- doesFileExist ghc_path
535 compiler <- case [c | Compiler c <- flags] of
536 [] -> locateGhc "ghc"
538 _ -> onlyOne "compiler"
540 linker <- case [l | Linker l <- flags] of
541 [] -> locateGhc compiler
543 _ -> onlyOne "linker"
545 writeFile cProgName $
546 concatMap outFlagHeaderCProg flags++
547 concatMap outHeaderCProg specials++
548 "\nint main (int argc, char *argv [])\n{\n"++
549 outHeaderHs flags (if needsH then Just outHName else Nothing) specials++
550 outHsLine (SourcePos name 0)++
551 concatMap outTokenHs toks++
554 unless (null [() | NoCompile <- flags]) $ exitWith ExitSuccess
558 compilerStatus <- systemL beVerbose $
561 concat [" "++f | CompFlag f <- flags]++
564 case compilerStatus of
565 e@(ExitFailure _) -> exitWith e
569 linkerStatus <- systemL beVerbose $
571 concat [" "++f | LinkFlag f <- flags]++
575 e@(ExitFailure _) -> exitWith e
579 progStatus <- systemL beVerbose (execProgName++" >"++outName)
582 e@(ExitFailure _) -> exitWith e
585 when needsH $ writeFile outHName $
586 "#ifndef "++includeGuard++"\n\
587 \#define "++includeGuard++"\n\
589 "__GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n\
592 \#include <HsFFI.h>\n\
595 \#define HsChar int\n\
597 concatMap outFlagH flags++
598 concatMap outTokenH specials++
601 when needsC $ writeFile outCName $
602 "#include \""++outHFile++"\"\n"++
603 concatMap outTokenC specials
604 -- NB. outHFile not outHName; works better when processed
605 -- by gcc or mkdependC.
607 systemL :: Bool -> String -> IO ExitCode
609 when flg (hPutStrLn stderr ("Executing: " ++ s))
612 onlyOne :: String -> IO a
613 onlyOne what = die ("Only one "++what++" may be specified\n")
615 outFlagHeaderCProg :: Flag -> String
616 outFlagHeaderCProg (Template t) = "#include \""++t++"\"\n"
617 outFlagHeaderCProg (Include f) = "#include "++f++"\n"
618 outFlagHeaderCProg (Define n Nothing) = "#define "++n++"\n"
619 outFlagHeaderCProg (Define n (Just v)) = "#define "++n++" "++v++"\n"
620 outFlagHeaderCProg _ = ""
622 outHeaderCProg :: (SourcePos, String, String) -> String
623 outHeaderCProg (pos, key, arg) = case key of
624 "include" -> outCLine pos++"#include "++arg++"\n"
625 "define" -> outCLine pos++"#define "++arg++"\n"
626 "undef" -> outCLine pos++"#undef "++arg++"\n"
628 's':'t':'r':'u':'c':'t':' ':_ -> outCLine pos++arg++"\n"
629 't':'y':'p':'e':'d':'e':'f':' ':_ -> outCLine pos++arg++"\n"
631 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
632 "let" -> case break (== '=') arg of
634 (header, _:body) -> case break isSpace header of
637 "#define hsc_"++name++"("++dropWhile isSpace args++") \
638 \printf ("++joinLines body++");\n"
641 joinLines = concat . intersperse " \\\n" . lines
643 outHeaderHs :: [Flag] -> Maybe String -> [(SourcePos, String, String)] -> String
644 outHeaderHs flags inH toks =
646 "__GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n\
647 \ printf (\"{-# OPTIONS -optc-D" ++
648 "__GLASGOW_HASKELL__=%d #-}\\n\", \
649 \__GLASGOW_HASKELL__);\n\
652 Nothing -> concatMap outFlag flags++concatMap outSpecial toks
653 Just f -> outOption ("-#include \""++f++"\"")
655 outFlag (Include f) = outOption ("-#include "++f)
656 outFlag (Define n Nothing) = outOption ("-optc-D"++n)
657 outFlag (Define n (Just v)) = outOption ("-optc-D"++n++"="++v)
659 outSpecial (pos, key, arg) = case key of
660 "include" -> outOption ("-#include "++arg)
661 "define" | goodForOptD arg -> outOption ("-optc-D"++toOptD arg)
663 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
665 goodForOptD arg = case arg of
667 c:_ | isSpace c -> True
670 toOptD arg = case break isSpace arg of
672 (name, _:value) -> name++'=':dropWhile isSpace value
673 outOption s = " printf (\"{-# OPTIONS %s #-}\\n\", \""++
674 showCString s++"\");\n"
676 outTokenHs :: Token -> String
677 outTokenHs (Text pos txt) =
678 case break (== '\n') txt of
679 (allTxt, []) -> outText allTxt
681 outText (first++"\n")++
685 outText s = " fputs (\""++showCString s++"\", stdout);\n"
686 outTokenHs (Special pos key arg) =
692 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
694 "enum" -> outCLine pos++outEnum arg
695 _ -> outCLine pos++" hsc_"++key++" ("++arg++");\n"
697 outEnum :: String -> String
699 case break (== ',') arg of
701 (t, _:afterT) -> case break (== ',') afterT of
704 enums (_:s) = case break (== ',') s of
706 this = case break (== '=') $ dropWhile isSpace enum of
708 " hsc_enum ("++t++", "++f++", \
709 \hsc_haskellize (\""++name++"\"), "++
712 " hsc_enum ("++t++", "++f++", \
713 \printf (\"%s\", \""++hsName++"\"), "++
718 outFlagH :: Flag -> String
719 outFlagH (Include f) = "#include "++f++"\n"
720 outFlagH (Define n Nothing) = "#define "++n++"\n"
721 outFlagH (Define n (Just v)) = "#define "++n++" "++v++"\n"
724 outTokenH :: (SourcePos, String, String) -> String
725 outTokenH (pos, key, arg) =
727 "include" -> outCLine pos++"#include "++arg++"\n"
728 "define" -> outCLine pos++"#define " ++arg++"\n"
729 "undef" -> outCLine pos++"#undef " ++arg++"\n"
730 "def" -> outCLine pos++case arg of
731 's':'t':'r':'u':'c':'t':' ':_ -> arg++"\n"
732 't':'y':'p':'e':'d':'e':'f':' ':_ -> arg++"\n"
733 'i':'n':'l':'i':'n':'e':' ':_ ->
738 _ -> "extern "++header++";\n"
739 where header = takeWhile (\c -> c /= '{' && c /= '=') arg
740 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
743 outTokenC :: (SourcePos, String, String) -> String
744 outTokenC (pos, key, arg) =
747 's':'t':'r':'u':'c':'t':' ':_ -> ""
748 't':'y':'p':'e':'d':'e':'f':' ':_ -> ""
749 'i':'n':'l':'i':'n':'e':' ':arg' ->
750 case span (\c -> c /= '{' && c /= '=') arg' of
757 "\n#ifndef __GNUC__\n\
762 _ -> outCLine pos++arg++"\n"
763 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
766 conditional :: String -> Bool
767 conditional "if" = True
768 conditional "ifdef" = True
769 conditional "ifndef" = True
770 conditional "elif" = True
771 conditional "else" = True
772 conditional "endif" = True
773 conditional "error" = True
774 conditional "warning" = True
775 conditional _ = False
777 outCLine :: SourcePos -> String
778 outCLine (SourcePos name line) =
779 "#line "++show line++" \""++showCString (snd (splitName name))++"\"\n"
781 outHsLine :: SourcePos -> String
782 outHsLine (SourcePos name line) =
783 " hsc_line ("++show (line + 1)++", \""++
784 showCString (snd (splitName name))++"\");\n"
786 showCString :: String -> String
787 showCString = concatMap showCChar
789 showCChar '\"' = "\\\""
790 showCChar '\'' = "\\\'"
791 showCChar '?' = "\\?"
792 showCChar '\\' = "\\\\"
793 showCChar c | c >= ' ' && c <= '~' = [c]
794 showCChar '\a' = "\\a"
795 showCChar '\b' = "\\b"
796 showCChar '\f' = "\\f"
797 showCChar '\n' = "\\n\"\n \""
798 showCChar '\r' = "\\r"
799 showCChar '\t' = "\\t"
800 showCChar '\v' = "\\v"
802 intToDigit (ord c `quot` 64),
803 intToDigit (ord c `quot` 8 `mod` 8),
804 intToDigit (ord c `mod` 8)]
808 -----------------------------------------
809 -- Cut and pasted from ghc/compiler/SysTools
810 -- Convert paths foo/baz to foo\baz on Windows
812 dosifyPath :: String -> String
813 #if defined(mingw32_HOST_OS)
814 dosifyPath xs = subst '/' '\\' xs
816 unDosifyPath :: String -> String
817 unDosifyPath xs = subst '\\' '/' xs
819 subst :: Eq a => a -> a -> [a] -> [a]
820 subst a b ls = map (\ x -> if x == a then b else x) ls
822 getExecDir :: String -> IO (Maybe String)
823 -- (getExecDir cmd) returns the directory in which the current
824 -- executable, which should be called 'cmd', is running
825 -- So if the full path is /a/b/c/d/e, and you pass "d/e" as cmd,
826 -- you'll get "/a/b/c" back as the result
828 = allocaArray len $ \buf -> do
829 ret <- getModuleFileName nullPtr buf len
830 if ret == 0 then return Nothing
831 else do s <- peekCString buf
832 return (Just (reverse (drop (length cmd)
833 (reverse (unDosifyPath s)))))
835 len = 2048::Int -- Plenty, PATH_MAX is 512 under Win32.
837 foreign import stdcall unsafe "GetModuleFileNameA"
838 getModuleFileName :: Ptr () -> CString -> Int -> IO Int32
843 getExecDir :: String -> IO (Maybe String)
844 getExecDir _ = return Nothing