3 ------------------------------------------------------------------------
4 -- $Id: Main.hs,v 1.57 2004/06/27 20:41:07 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
481 [] -> if not (null ext) && last ext == 'c'
482 then return (dir++base++init ext, dir, base)
485 then return (dir++base++"_out.hs", dir, base)
486 else return (dir++base++".hs", dir, base)
488 (dir, file) = splitName name
489 (base, ext) = splitExt file
491 (dir, file) = splitName f
492 (base, _) = splitExt file
493 in return (f, dir, base)
494 _ -> onlyOne "output file"
496 let cProgName = outDir++outBase++"_hsc_make.c"
497 oProgName = outDir++outBase++"_hsc_make.o"
498 progName = outDir++outBase++"_hsc_make"
499 #if defined(mingw32_HOST_OS)
500 -- This is a real hack, but the quoting mechanism used for calling the C preprocesseor
501 -- via GHC has changed a few times, so this seems to be the only way... :-P * * *
504 outHFile = outBase++"_hsc.h"
505 outHName = outDir++outHFile
506 outCName = outDir++outBase++"_hsc.c"
508 beVerbose = any (\ x -> case x of { Verbose -> True; _ -> False}) flags
511 | null outDir = dosifyPath ("./" ++ progName)
512 | otherwise = progName
514 let specials = [(pos, key, arg) | Special pos key arg <- toks]
516 let needsC = any (\(_, key, _) -> key == "def") specials
519 let includeGuard = map fixChar outHName
521 fixChar c | isAlphaNum c = toUpper c
524 -- Try locating GHC..on Win32, look in the vicinity of hsc2hs.
525 -- Returns a native-format path
527 mb <- getExecDir "bin/hsc2hs.exe"
529 Nothing -> return def
531 let ghc_path = dosifyPath (x ++ "bin/ghc.exe")
532 flg <- doesFileExist ghc_path
537 -- On a Win32 installation we execute the hsc2hs binary directly,
538 -- with no --cc flags, so we'll call locateGhc here, which will
539 -- succeed, via getExecDir.
541 -- On a Unix installation, we'll run the wrapper script hsc2hs.sh
542 -- (called plain hsc2hs in the installed tree), which will pass
543 -- a suitable C compiler via --cc
545 -- The in-place installation always uses the wrapper script,
546 -- (called hsc2hs-inplace, generated from hsc2hs.sh)
547 compiler <- case [c | Compiler c <- flags] of
548 [] -> locateGhc "ghc"
550 _ -> onlyOne "compiler"
552 linker <- case [l | Linker l <- flags] of
553 [] -> locateGhc compiler
555 _ -> onlyOne "linker"
557 writeFile cProgName $
558 concatMap outFlagHeaderCProg flags++
559 concatMap outHeaderCProg specials++
560 "\nint main (int argc, char *argv [])\n{\n"++
561 outHeaderHs flags (if needsH then Just outHName else Nothing) specials++
562 outHsLine (SourcePos name 0)++
563 concatMap outTokenHs toks++
566 unless (null [() | NoCompile <- flags]) $ exitWith ExitSuccess
570 compilerStatus <- systemL beVerbose $
573 concat [" "++f | CompFlag f <- flags]++
576 case compilerStatus of
577 e@(ExitFailure _) -> exitWith e
581 linkerStatus <- systemL beVerbose $
583 concat [" "++f | LinkFlag f <- flags]++
587 e@(ExitFailure _) -> exitWith e
591 progStatus <- systemL beVerbose (execProgName++" >"++outName)
594 e@(ExitFailure _) -> exitWith e
597 when needsH $ writeFile outHName $
598 "#ifndef "++includeGuard++"\n\
599 \#define "++includeGuard++"\n\
601 "__GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n\
604 \#include <HsFFI.h>\n\
607 \#define HsChar int\n\
609 concatMap outFlagH flags++
610 concatMap outTokenH specials++
613 when needsC $ writeFile outCName $
614 "#include \""++outHFile++"\"\n"++
615 concatMap outTokenC specials
616 -- NB. outHFile not outHName; works better when processed
617 -- by gcc or mkdependC.
619 systemL :: Bool -> String -> IO ExitCode
621 when flg (hPutStrLn stderr ("Executing: " ++ s))
624 onlyOne :: String -> IO a
625 onlyOne what = die ("Only one "++what++" may be specified\n")
627 outFlagHeaderCProg :: Flag -> String
628 outFlagHeaderCProg (Template t) = "#include \""++t++"\"\n"
629 outFlagHeaderCProg (Include f) = "#include "++f++"\n"
630 outFlagHeaderCProg (Define n Nothing) = "#define "++n++"\n"
631 outFlagHeaderCProg (Define n (Just v)) = "#define "++n++" "++v++"\n"
632 outFlagHeaderCProg _ = ""
634 outHeaderCProg :: (SourcePos, String, String) -> String
635 outHeaderCProg (pos, key, arg) = case key of
636 "include" -> outCLine pos++"#include "++arg++"\n"
637 "define" -> outCLine pos++"#define "++arg++"\n"
638 "undef" -> outCLine pos++"#undef "++arg++"\n"
640 's':'t':'r':'u':'c':'t':' ':_ -> outCLine pos++arg++"\n"
641 't':'y':'p':'e':'d':'e':'f':' ':_ -> outCLine pos++arg++"\n"
643 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
644 "let" -> case break (== '=') arg of
646 (header, _:body) -> case break isSpace header of
649 "#define hsc_"++name++"("++dropWhile isSpace args++") \
650 \printf ("++joinLines body++");\n"
653 joinLines = concat . intersperse " \\\n" . lines
655 outHeaderHs :: [Flag] -> Maybe String -> [(SourcePos, String, String)] -> String
656 outHeaderHs flags inH toks =
658 "__GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n\
659 \ printf (\"{-# OPTIONS -optc-D" ++
660 "__GLASGOW_HASKELL__=%d #-}\\n\", \
661 \__GLASGOW_HASKELL__);\n\
664 Nothing -> concatMap outFlag flags++concatMap outSpecial toks
665 Just f -> outOption ("-#include \""++f++"\"")
667 outFlag (Include f) = outOption ("-#include "++f)
668 outFlag (Define n Nothing) = outOption ("-optc-D"++n)
669 outFlag (Define n (Just v)) = outOption ("-optc-D"++n++"="++v)
671 outSpecial (pos, key, arg) = case key of
672 "include" -> outOption ("-#include "++arg)
673 "define" | goodForOptD arg -> outOption ("-optc-D"++toOptD arg)
675 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
677 goodForOptD arg = case arg of
679 c:_ | isSpace c -> True
682 toOptD arg = case break isSpace arg of
684 (name, _:value) -> name++'=':dropWhile isSpace value
685 outOption s = " printf (\"{-# OPTIONS %s #-}\\n\", \""++
686 showCString s++"\");\n"
688 outTokenHs :: Token -> String
689 outTokenHs (Text pos txt) =
690 case break (== '\n') txt of
691 (allTxt, []) -> outText allTxt
693 outText (first++"\n")++
697 outText s = " fputs (\""++showCString s++"\", stdout);\n"
698 outTokenHs (Special pos key arg) =
704 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
706 "enum" -> outCLine pos++outEnum arg
707 _ -> outCLine pos++" hsc_"++key++" ("++arg++");\n"
709 outEnum :: String -> String
711 case break (== ',') arg of
713 (t, _:afterT) -> case break (== ',') afterT of
716 enums (_:s) = case break (== ',') s of
718 this = case break (== '=') $ dropWhile isSpace enum of
720 " hsc_enum ("++t++", "++f++", \
721 \hsc_haskellize (\""++name++"\"), "++
724 " hsc_enum ("++t++", "++f++", \
725 \printf (\"%s\", \""++hsName++"\"), "++
730 outFlagH :: Flag -> String
731 outFlagH (Include f) = "#include "++f++"\n"
732 outFlagH (Define n Nothing) = "#define "++n++"\n"
733 outFlagH (Define n (Just v)) = "#define "++n++" "++v++"\n"
736 outTokenH :: (SourcePos, String, String) -> String
737 outTokenH (pos, key, arg) =
739 "include" -> outCLine pos++"#include "++arg++"\n"
740 "define" -> outCLine pos++"#define " ++arg++"\n"
741 "undef" -> outCLine pos++"#undef " ++arg++"\n"
742 "def" -> outCLine pos++case arg of
743 's':'t':'r':'u':'c':'t':' ':_ -> arg++"\n"
744 't':'y':'p':'e':'d':'e':'f':' ':_ -> arg++"\n"
745 'i':'n':'l':'i':'n':'e':' ':_ ->
750 _ -> "extern "++header++";\n"
751 where header = takeWhile (\c -> c /= '{' && c /= '=') arg
752 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
755 outTokenC :: (SourcePos, String, String) -> String
756 outTokenC (pos, key, arg) =
759 's':'t':'r':'u':'c':'t':' ':_ -> ""
760 't':'y':'p':'e':'d':'e':'f':' ':_ -> ""
761 'i':'n':'l':'i':'n':'e':' ':arg' ->
762 case span (\c -> c /= '{' && c /= '=') arg' of
769 "\n#ifndef __GNUC__\n\
774 _ -> outCLine pos++arg++"\n"
775 _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
778 conditional :: String -> Bool
779 conditional "if" = True
780 conditional "ifdef" = True
781 conditional "ifndef" = True
782 conditional "elif" = True
783 conditional "else" = True
784 conditional "endif" = True
785 conditional "error" = True
786 conditional "warning" = True
787 conditional _ = False
789 outCLine :: SourcePos -> String
790 outCLine (SourcePos name line) =
791 "#line "++show line++" \""++showCString (snd (splitName name))++"\"\n"
793 outHsLine :: SourcePos -> String
794 outHsLine (SourcePos name line) =
795 " hsc_line ("++show (line + 1)++", \""++
796 showCString (snd (splitName name))++"\");\n"
798 showCString :: String -> String
799 showCString = concatMap showCChar
801 showCChar '\"' = "\\\""
802 showCChar '\'' = "\\\'"
803 showCChar '?' = "\\?"
804 showCChar '\\' = "\\\\"
805 showCChar c | c >= ' ' && c <= '~' = [c]
806 showCChar '\a' = "\\a"
807 showCChar '\b' = "\\b"
808 showCChar '\f' = "\\f"
809 showCChar '\n' = "\\n\"\n \""
810 showCChar '\r' = "\\r"
811 showCChar '\t' = "\\t"
812 showCChar '\v' = "\\v"
814 intToDigit (ord c `quot` 64),
815 intToDigit (ord c `quot` 8 `mod` 8),
816 intToDigit (ord c `mod` 8)]
820 -----------------------------------------
821 -- Cut and pasted from ghc/compiler/SysTools
822 -- Convert paths foo/baz to foo\baz on Windows
824 dosifyPath :: String -> String
825 #if defined(mingw32_HOST_OS)
826 dosifyPath xs = subst '/' '\\' xs
828 unDosifyPath :: String -> String
829 unDosifyPath xs = subst '\\' '/' xs
831 subst :: Eq a => a -> a -> [a] -> [a]
832 subst a b ls = map (\ x -> if x == a then b else x) ls
834 getExecDir :: String -> IO (Maybe String)
835 -- (getExecDir cmd) returns the directory in which the current
836 -- executable, which should be called 'cmd', is running
837 -- So if the full path is /a/b/c/d/e, and you pass "d/e" as cmd,
838 -- you'll get "/a/b/c" back as the result
840 = allocaArray len $ \buf -> do
841 ret <- getModuleFileName nullPtr buf len
842 if ret == 0 then return Nothing
843 else do s <- peekCString buf
844 return (Just (reverse (drop (length cmd)
845 (reverse (unDosifyPath s)))))
847 len = 2048::Int -- Plenty, PATH_MAX is 512 under Win32.
849 foreign import stdcall unsafe "GetModuleFileNameA"
850 getModuleFileName :: Ptr () -> CString -> Int -> IO Int32
855 getExecDir :: String -> IO (Maybe String)
856 getExecDir _ = return Nothing