+{-# OPTIONS -fffi -cpp #-}
+
------------------------------------------------------------------------
--- $Id: Main.hs,v 1.25 2001/03/05 00:07:23 qrczak Exp $
+-- $Id: Main.hs,v 1.59 2004/08/12 12:12:54 simonmar Exp $
--
-- Program for converting .hsc files to .hs files, by converting the
-- file into a C program which is run to generate the Haskell source.
--
-- See the documentation in the Users' Guide for more details.
+#if __GLASGOW_HASKELL__ >= 504 || __NHC__ >= 114
+import System.Console.GetOpt
+#else
import GetOpt
-import System (getProgName, getArgs, ExitCode(..), exitWith, exitFailure)
-import KludgedSystem (system, defaultCompiler)
-import Directory (removeFile)
-import Monad (MonadPlus(..), liftM, liftM2, when, unless)
+#endif
+
+import System (getProgName, getArgs, ExitCode(..), exitWith, system)
+import Directory (removeFile,doesFileExist)
+import Monad (MonadPlus(..), liftM, liftM2, when)
import Char (isAlpha, isAlphaNum, isSpace, isDigit, toUpper, intToDigit, ord)
-import List (intersperse)
+import List (intersperse, isSuffixOf)
+import IO (hPutStr, hPutStrLn, stderr)
+
+#if defined(mingw32_HOST_OS)
+import Foreign
+#if __GLASGOW_HASKELL__ >= 504 || __NHC__ >= 114
+import Foreign.C.String
+#else
+import CString
+#endif
+#endif
+
version :: String
-version = "hsc2hs-0.65"
+version = "hsc2hs version 0.66\n"
data Flag
= Help
| LinkFlag String
| NoCompile
| Include String
+ | Define String (Maybe String)
+ | Output String
+ | Verbose
+
+template_flag :: Flag -> Bool
+template_flag (Template _) = True
+template_flag _ = False
include :: String -> Flag
include s@('\"':_) = Include s
include s@('<' :_) = Include s
include s = Include ("\""++s++"\"")
+define :: String -> Flag
+define s = case break (== '=') s of
+ (name, []) -> Define name Nothing
+ (name, _:value) -> Define name (Just value)
+
options :: [OptDescr Flag]
options = [
- Option "t" ["template"] (ReqArg Template "FILE") "template file",
- Option "c" ["cc"] (ReqArg Compiler "PROG") "C compiler to use",
- Option "l" ["ld"] (ReqArg Linker "PROG") "linker to use",
- Option "C" ["cflag"] (ReqArg CompFlag "FLAG") "flag to pass to the C compiler",
- Option "I" [] (ReqArg (CompFlag . ("-I"++))
- "DIR") "passed to the C compiler",
- Option "L" ["lflag"] (ReqArg LinkFlag "FLAG") "flag to pass to the linker",
- Option "" ["no-compile"] (NoArg NoCompile) "stop after writing *.hs_make.c",
- Option "i" ["include"] (ReqArg include "FILE") "as if placed in the source",
- Option "" ["help"] (NoArg Help) "display this help and exit",
- Option "" ["version"] (NoArg Version) "output version information and exit"]
+ Option ['o'] ["output"] (ReqArg Output "FILE")
+ "name of main output file",
+ Option ['t'] ["template"] (ReqArg Template "FILE")
+ "template file",
+ Option ['c'] ["cc"] (ReqArg Compiler "PROG")
+ "C compiler to use",
+ Option ['l'] ["ld"] (ReqArg Linker "PROG")
+ "linker to use",
+ Option ['C'] ["cflag"] (ReqArg CompFlag "FLAG")
+ "flag to pass to the C compiler",
+ Option ['I'] [] (ReqArg (CompFlag . ("-I"++)) "DIR")
+ "passed to the C compiler",
+ Option ['L'] ["lflag"] (ReqArg LinkFlag "FLAG")
+ "flag to pass to the linker",
+ Option ['i'] ["include"] (ReqArg include "FILE")
+ "as if placed in the source",
+ Option ['D'] ["define"] (ReqArg define "NAME[=VALUE]")
+ "as if placed in the source",
+ Option [] ["no-compile"] (NoArg NoCompile)
+ "stop after writing *_hsc_make.c",
+ Option ['v'] ["verbose"] (NoArg Verbose)
+ "dump commands to stderr",
+ Option ['?'] ["help"] (NoArg Help)
+ "display this help and exit",
+ Option ['V'] ["version"] (NoArg Version)
+ "output version information and exit" ]
+
main :: IO ()
main = do
- prog <- getProgName
- let header = "Usage: "++prog++" [OPTIONS] INPUT.hsc [...]"
+ prog <- getProgramName
+ let header = "Usage: "++prog++" [OPTIONS] INPUT.hsc [...]\n"
args <- getArgs
- case getOpt Permute options args of
- (flags, _, _)
- | any isHelp flags -> putStrLn (usageInfo header options)
- | any isVersion flags -> putStrLn version
+ let (flags, files, errs) = getOpt Permute options args
+
+ -- If there is no Template flag explicitly specified, try
+ -- to find one by looking near the executable. This only
+ -- works on Win32 (getExecDir). On Unix, there's a wrapper
+ -- script which specifies an explicit template flag.
+ flags_w_tpl <- if any template_flag flags then
+ return flags
+ else
+ do mb_path <- getExecDir "/bin/hsc2hs.exe"
+ add_opt <-
+ case mb_path of
+ Nothing -> return id
+ Just path -> do
+ let templ = path ++ "/template-hsc.h"
+ flg <- doesFileExist templ
+ if flg
+ then return ((Template templ):)
+ else return id
+ return (add_opt flags)
+ case (files, errs) of
+ (_, _)
+ | any isHelp flags_w_tpl -> bye (usageInfo header options)
+ | any isVersion flags_w_tpl -> bye version
where
isHelp Help = True; isHelp _ = False
isVersion Version = True; isVersion _ = False
- (_, [], []) -> putStrLn (prog++": No input files")
- (flags, files, []) -> mapM_ (processFile flags) files
- (_, _, errs) -> do
- mapM_ putStrLn errs
- putStrLn (usageInfo header options)
- exitFailure
+ ((_:_), []) -> mapM_ (processFile flags_w_tpl) files
+ (_, _ ) -> die (concat errs ++ usageInfo header options)
+
+getProgramName :: IO String
+getProgramName = liftM (`withoutSuffix` "-bin") getProgName
+ where str `withoutSuffix` suff
+ | suff `isSuffixOf` str = take (length str - length suff) str
+ | otherwise = str
+
+bye :: String -> IO a
+bye s = putStr s >> exitWith ExitSuccess
+
+die :: String -> IO a
+die s = hPutStr stderr s >> exitWith (ExitFailure 1)
processFile :: [Flag] -> String -> IO ()
-processFile flags name = do
- s <- readFile name
- case parser of
- Parser p -> case p (SourcePos name 1) s of
- Success _ _ _ toks -> output flags name toks
- Failure (SourcePos name' line) msg -> do
- putStrLn (name'++":"++show line++": "++msg)
- exitFailure
+processFile flags name
+ = do let file_name = dosifyPath name
+ s <- readFile file_name
+ case parser of
+ Parser p -> case p (SourcePos file_name 1) s of
+ Success _ _ _ toks -> output flags file_name toks
+ Failure (SourcePos name' line) msg ->
+ die (name'++":"++show line++": "++msg++"\n")
------------------------------------------------------------------------
-- A deterministic parser which remembers the text which has been parsed.
Success pos' _ s' a -> Success pos' out s' a
Failure pos' msg -> Failure pos' msg
-{-# INLINE lookAhead #-}
lookAhead :: Parser String
lookAhead = Parser $ \pos s -> Success pos [] s s
-{-# INLINE satisfy #-}
satisfy :: (Char -> Bool) -> Parser Char
satisfy p =
Parser $ \pos s -> case s of
unescapeHashes ('#':'#':s) = '#' : unescapeHashes s
unescapeHashes (c:s) = c : unescapeHashes s
-{-# INLINE lookAheadC #-}
lookAheadC :: Parser String
lookAheadC = liftM joinLines lookAhead
where
joinLines ('\\':'\n':s) = joinLines s
joinLines (c:s) = c : joinLines s
-{-# INLINE satisfyC #-}
satisfyC :: (Char -> Bool) -> Parser Char
satisfyC p = do
s <- lookAhead
_:_ -> do anyCharC_; cString quote
------------------------------------------------------------------------
--- Output the output files.
+-- Write the output files.
+
+splitName :: String -> (String, String)
+splitName name =
+ case break (== '/') name of
+ (file, []) -> ([], file)
+ (dir, sep:rest) -> (dir++sep:restDir, restFile)
+ where
+ (restDir, restFile) = splitName rest
+
+splitExt :: String -> (String, String)
+splitExt name =
+ case break (== '.') name of
+ (base, []) -> (base, [])
+ (base, sepRest@(sep:rest))
+ | null restExt -> (base, sepRest)
+ | otherwise -> (base++sep:restBase, restExt)
+ where
+ (restBase, restExt) = splitExt rest
output :: [Flag] -> String -> [Token] -> IO ()
-output flags name toks = let
- baseName = case reverse name of
- 'c':base -> reverse base
- _ -> name++".hs"
- cProgName = baseName++"_make.c"
- oProgName = baseName++"_make.o"
- progName = baseName++"_make"
- outHsName = baseName
- outHName = baseName++".h"
- outCName = baseName++".c"
+output flags name toks = do
- execProgName = case progName of
- '/':_ -> progName
- _ -> "./"++progName
+ (outName, outDir, outBase) <- case [f | Output f <- flags] of
+ [] -> if not (null ext) && last ext == 'c'
+ then return (dir++base++init ext, dir, base)
+ else
+ if ext == ".hs"
+ then return (dir++base++"_out.hs", dir, base)
+ else return (dir++base++".hs", dir, base)
+ where
+ (dir, file) = splitName name
+ (base, ext) = splitExt file
+ [f] -> let
+ (dir, file) = splitName f
+ (base, _) = splitExt file
+ in return (f, dir, base)
+ _ -> onlyOne "output file"
- specials = [(pos, key, arg) | Special pos key arg <- toks]
+ let cProgName = outDir++outBase++"_hsc_make.c"
+ oProgName = outDir++outBase++"_hsc_make.o"
+ progName = outDir++outBase++"_hsc_make"
+#if defined(mingw32_HOST_OS)
+-- This is a real hack, but the quoting mechanism used for calling the C preprocesseor
+-- via GHC has changed a few times, so this seems to be the only way... :-P * * *
+ ++ ".exe"
+#endif
+ outHFile = outBase++"_hsc.h"
+ outHName = outDir++outHFile
+ outCName = outDir++outBase++"_hsc.c"
+
+ beVerbose = any (\ x -> case x of { Verbose -> True; _ -> False}) flags
+
+ let execProgName
+ | null outDir = dosifyPath ("./" ++ progName)
+ | otherwise = progName
- needsC = any (\(_, key, _) -> key == "def") specials
- needsH = needsC
+ let specials = [(pos, key, arg) | Special pos key arg <- toks]
- includeGuard = map fixChar outHName
- where
- fixChar c | isAlphaNum c = toUpper c
- | otherwise = '_'
+ let needsC = any (\(_, key, _) -> key == "def") specials
+ needsH = needsC
- in do
+ let includeGuard = map fixChar outHName
+ where
+ fixChar c | isAlphaNum c = toUpper c
+ | otherwise = '_'
+
+ -- Try locating GHC..on Win32, look in the vicinity of hsc2hs.
+ -- Returns a native-format path
+ locateGhc def = do
+ mb <- getExecDir "bin/hsc2hs.exe"
+ case mb of
+ Nothing -> return def
+ Just x -> do
+ let ghc_path = dosifyPath (x ++ "bin/ghc.exe")
+ flg <- doesFileExist ghc_path
+ if flg
+ then return ghc_path
+ else return def
+ -- On a Win32 installation we execute the hsc2hs binary directly,
+ -- with no --cc flags, so we'll call locateGhc here, which will
+ -- succeed, via getExecDir.
+ --
+ -- On a Unix installation, we'll run the wrapper script hsc2hs.sh
+ -- (called plain hsc2hs in the installed tree), which will pass
+ -- a suitable C compiler via --cc
+ --
+ -- The in-place installation always uses the wrapper script,
+ -- (called hsc2hs-inplace, generated from hsc2hs.sh)
compiler <- case [c | Compiler c <- flags] of
- [] -> return "ghc"
+ [] -> locateGhc "ghc"
[c] -> return c
_ -> onlyOne "compiler"
+
linker <- case [l | Linker l <- flags] of
- [] -> return defaultCompiler
+ [] -> locateGhc compiler
[l] -> return l
_ -> onlyOne "linker"
-
+
writeFile cProgName $
- concat ["#include \""++t++"\"\n" | Template t <- flags]++
- concat ["#include "++f++"\n" | Include f <- flags]++
- outHeaderCProg specials++
- "\nint main (void)\n{\n"++
+ concatMap outFlagHeaderCProg flags++
+ concatMap outHeaderCProg specials++
+ "\nint main (int argc, char *argv [])\n{\n"++
outHeaderHs flags (if needsH then Just outHName else Nothing) specials++
outHsLine (SourcePos name 0)++
concatMap outTokenHs toks++
" return 0;\n}\n"
- unless (null [() | NoCompile <- flags]) $ exitWith ExitSuccess
+ -- NOTE: hbc compiles "[() | NoCompile <- flags]" into wrong code,
+ -- so we use something slightly more complicated. :-P
+ when (any (\x -> case x of NoCompile -> True; _ -> False) flags) $
+ exitWith ExitSuccess
+
+
- compilerStatus <- system $
+ compilerStatus <- systemL beVerbose $
compiler++
" -c"++
concat [" "++f | CompFlag f <- flags]++
_ -> return ()
removeFile cProgName
- linkerStatus <- system $
+ linkerStatus <- systemL beVerbose $
linker++
concat [" "++f | LinkFlag f <- flags]++
" "++oProgName++
_ -> return ()
removeFile oProgName
- system (execProgName++" >"++outHsName)
+ progStatus <- systemL beVerbose (execProgName++" >"++outName)
removeFile progName
+ case progStatus of
+ e@(ExitFailure _) -> exitWith e
+ _ -> return ()
when needsH $ writeFile outHName $
- "#ifndef "++includeGuard++"\n\
- \#define "++includeGuard++"\n\
- \#if __GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n\
- \#include <Rts.h>\n\
- \#endif\n\
- \#include <HsFFI.h>\n\
- \#if __NHC__\n\
- \#undef HsChar\n\
- \#define HsChar int\n\
- \#endif\n"++
- concat ["#include "++n++"\n" | Include n <- flags]++
+ "#ifndef "++includeGuard++"\n" ++
+ "#define "++includeGuard++"\n" ++
+ "#if __GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n" ++
+ "#include <Rts.h>\n" ++
+ "#endif\n" ++
+ "#include <HsFFI.h>\n" ++
+ "#if __NHC__\n" ++
+ "#undef HsChar\n" ++
+ "#define HsChar int\n" ++
+ "#endif\n" ++
+ concatMap outFlagH flags++
concatMap outTokenH specials++
"#endif\n"
when needsC $ writeFile outCName $
- "#include \""++outHName++"\"\n"++
+ "#include \""++outHFile++"\"\n"++
concatMap outTokenC specials
+ -- NB. outHFile not outHName; works better when processed
+ -- by gcc or mkdependC.
+
+systemL :: Bool -> String -> IO ExitCode
+systemL flg s = do
+ when flg (hPutStrLn stderr ("Executing: " ++ s))
+ system s
onlyOne :: String -> IO a
-onlyOne what = do
- putStrLn ("Only one "++what++" may be specified")
- exitFailure
-
-outHeaderCProg :: [(SourcePos, String, String)] -> String
-outHeaderCProg =
- concatMap $ \(pos, key, arg) -> case key of
- "include" -> outCLine pos++"#include "++arg++"\n"
- "define" -> outCLine pos++"#define "++arg++"\n"
- "undef" -> outCLine pos++"#undef "++arg++"\n"
- "def" -> case arg of
- 's':'t':'r':'u':'c':'t':' ':_ -> outCLine pos++arg++"\n"
- 't':'y':'p':'e':'d':'e':'f':' ':_ -> outCLine pos++arg++"\n"
- _ -> ""
- _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
- "let" -> case break (== '=') arg of
- (_, "") -> ""
- (header, _:body) -> case break isSpace header of
- (name, args) ->
- outCLine pos++
- "#define hsc_"++name++"("++dropWhile isSpace args++") \
- \printf ("++joinLines body++");\n"
+onlyOne what = die ("Only one "++what++" may be specified\n")
+
+outFlagHeaderCProg :: Flag -> String
+outFlagHeaderCProg (Template t) = "#include \""++t++"\"\n"
+outFlagHeaderCProg (Include f) = "#include "++f++"\n"
+outFlagHeaderCProg (Define n Nothing) = "#define "++n++"\n"
+outFlagHeaderCProg (Define n (Just v)) = "#define "++n++" "++v++"\n"
+outFlagHeaderCProg _ = ""
+
+outHeaderCProg :: (SourcePos, String, String) -> String
+outHeaderCProg (pos, key, arg) = case key of
+ "include" -> outCLine pos++"#include "++arg++"\n"
+ "define" -> outCLine pos++"#define "++arg++"\n"
+ "undef" -> outCLine pos++"#undef "++arg++"\n"
+ "def" -> case arg of
+ 's':'t':'r':'u':'c':'t':' ':_ -> outCLine pos++arg++"\n"
+ 't':'y':'p':'e':'d':'e':'f':' ':_ -> outCLine pos++arg++"\n"
_ -> ""
- where
+ _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
+ "let" -> case break (== '=') arg of
+ (_, "") -> ""
+ (header, _:body) -> case break isSpace header of
+ (name, args) ->
+ outCLine pos++
+ "#define hsc_"++name++"("++dropWhile isSpace args++") " ++
+ "printf ("++joinLines body++");\n"
+ _ -> ""
+ where
joinLines = concat . intersperse " \\\n" . lines
outHeaderHs :: [Flag] -> Maybe String -> [(SourcePos, String, String)] -> String
outHeaderHs flags inH toks =
- "#if __GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n\
- \ printf (\"{-# OPTIONS -optc-D__GLASGOW_HASKELL__=%d #-}\\n\", \
- \__GLASGOW_HASKELL__);\n\
- \#endif\n"++
- includeH++
- concatMap outSpecial toks
+ "#if " ++
+ "__GLASGOW_HASKELL__ && __GLASGOW_HASKELL__ < 409\n" ++
+ " printf (\"{-# OPTIONS -optc-D" ++
+ "__GLASGOW_HASKELL__=%d #-}\\n\", " ++
+ "__GLASGOW_HASKELL__);\n" ++
+ "#endif\n"++
+ case inH of
+ Nothing -> concatMap outFlag flags++concatMap outSpecial toks
+ Just f -> outOption ("-#include \""++f++"\"")
where
+ outFlag (Include f) = outOption ("-#include "++f)
+ outFlag (Define n Nothing) = outOption ("-optc-D"++n)
+ outFlag (Define n (Just v)) = outOption ("-optc-D"++n++"="++v)
+ outFlag _ = ""
outSpecial (pos, key, arg) = case key of
- "include" -> case inH of
- Nothing -> outOption ("-#include "++arg)
- Just _ -> ""
- "define" -> case inH of
- Nothing | goodForOptD arg -> outOption ("-optc-D"++toOptD arg)
- _ -> ""
- _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
- _ -> ""
+ "include" -> outOption ("-#include "++arg)
+ "define" | goodForOptD arg -> outOption ("-optc-D"++toOptD arg)
+ | otherwise -> ""
+ _ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
+ _ -> ""
goodForOptD arg = case arg of
"" -> True
c:_ | isSpace c -> True
toOptD arg = case break isSpace arg of
(name, "") -> name
(name, _:value) -> name++'=':dropWhile isSpace value
- includeH = concat [
- outOption ("-#include "++name++"")
- | name <- case inH of
- Nothing -> [name | Include name <- flags]
- Just name -> ["\""++name++"\""]]
outOption s = " printf (\"{-# OPTIONS %s #-}\\n\", \""++
showCString s++"\");\n"
outTokenHs :: Token -> String
-outTokenHs (Text pos text) =
- case break (== '\n') text of
- (all, []) -> outText all
+outTokenHs (Text pos txt) =
+ case break (== '\n') txt of
+ (allTxt, []) -> outText allTxt
(first, _:rest) ->
outText (first++"\n")++
outHsLine pos++
(enum, rest) -> let
this = case break (== '=') $ dropWhile isSpace enum of
(name, []) ->
- " hsc_enum ("++t++", "++f++", \
- \hsc_haskellize (\""++name++"\"), "++
+ " hsc_enum ("++t++", "++f++", " ++
+ "hsc_haskellize (\""++name++"\"), "++
name++");\n"
(hsName, _:cName) ->
- " hsc_enum ("++t++", "++f++", \
- \printf (\"%s\", \""++hsName++"\"), "++
+ " hsc_enum ("++t++", "++f++", " ++
+ "printf (\"%s\", \""++hsName++"\"), "++
cName++");\n"
in this++enums rest
in enums afterF
+outFlagH :: Flag -> String
+outFlagH (Include f) = "#include "++f++"\n"
+outFlagH (Define n Nothing) = "#define "++n++"\n"
+outFlagH (Define n (Just v)) = "#define "++n++" "++v++"\n"
+outFlagH _ = ""
+
outTokenH :: (SourcePos, String, String) -> String
outTokenH (pos, key, arg) =
case key of
's':'t':'r':'u':'c':'t':' ':_ -> arg++"\n"
't':'y':'p':'e':'d':'e':'f':' ':_ -> arg++"\n"
'i':'n':'l':'i':'n':'e':' ':_ ->
- "#ifdef __GNUC__\n\
- \extern\n\
- \#endif\n"++
+ "#ifdef __GNUC__\n" ++
+ "extern\n" ++
+ "#endif\n"++
arg++"\n"
_ -> "extern "++header++";\n"
- where header = takeWhile (\c -> c /= '{' && c /= '=') arg
+ where header = takeWhile (\c -> c /= '{' && c /= '=') arg
_ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
_ -> ""
"def" -> case arg of
's':'t':'r':'u':'c':'t':' ':_ -> ""
't':'y':'p':'e':'d':'e':'f':' ':_ -> ""
- 'i':'n':'l':'i':'n':'e':' ':_ ->
- outCLine pos++
- "#ifndef __GNUC__\n\
- \extern\n\
- \#endif\n"++
- header++
- "\n#ifndef __GNUC__\n\
- \;\n\
- \#else\n"++
- body++
- "\n#endif\n"
+ 'i':'n':'l':'i':'n':'e':' ':arg' ->
+ case span (\c -> c /= '{' && c /= '=') arg' of
+ (header, body) ->
+ outCLine pos++
+ "#ifndef __GNUC__\n" ++
+ "extern inline\n" ++
+ "#endif\n"++
+ header++
+ "\n#ifndef __GNUC__\n" ++
+ ";\n" ++
+ "#else\n"++
+ body++
+ "\n#endif\n"
_ -> outCLine pos++arg++"\n"
- where (header, body) = span (\c -> c /= '{' && c /= '=') arg
_ | conditional key -> outCLine pos++"#"++key++" "++arg++"\n"
_ -> ""
outCLine :: SourcePos -> String
outCLine (SourcePos name line) =
- "# "++show line++" \""++showCString (basename name)++"\"\n"
+ "#line "++show line++" \""++showCString (snd (splitName name))++"\"\n"
outHsLine :: SourcePos -> String
outHsLine (SourcePos name line) =
" hsc_line ("++show (line + 1)++", \""++
- showCString (basename name)++"\");\n"
-
-basename :: String -> String
-basename s = case break (== '/') s of
- (name, []) -> name
- (_, _:rest) -> basename rest
+ showCString (snd (splitName name))++"\");\n"
showCString :: String -> String
showCString = concatMap showCChar
intToDigit (ord c `quot` 64),
intToDigit (ord c `quot` 8 `mod` 8),
intToDigit (ord c `mod` 8)]
+
+
+
+-----------------------------------------
+-- Cut and pasted from ghc/compiler/SysTools
+-- Convert paths foo/baz to foo\baz on Windows
+
+dosifyPath :: String -> String
+#if defined(mingw32_HOST_OS)
+dosifyPath xs = subst '/' '\\' xs
+
+unDosifyPath :: String -> String
+unDosifyPath xs = subst '\\' '/' xs
+
+subst :: Eq a => a -> a -> [a] -> [a]
+subst a b ls = map (\ x -> if x == a then b else x) ls
+
+getExecDir :: String -> IO (Maybe String)
+-- (getExecDir cmd) returns the directory in which the current
+-- executable, which should be called 'cmd', is running
+-- So if the full path is /a/b/c/d/e, and you pass "d/e" as cmd,
+-- you'll get "/a/b/c" back as the result
+getExecDir cmd
+ = allocaArray len $ \buf -> do
+ ret <- getModuleFileName nullPtr buf len
+ if ret == 0 then return Nothing
+ else do s <- peekCString buf
+ return (Just (reverse (drop (length cmd)
+ (reverse (unDosifyPath s)))))
+ where
+ len = 2048::Int -- Plenty, PATH_MAX is 512 under Win32.
+
+foreign import stdcall unsafe "GetModuleFileNameA"
+ getModuleFileName :: Ptr () -> CString -> Int -> IO Int32
+
+#else
+dosifyPath xs = xs
+
+getExecDir :: String -> IO (Maybe String)
+getExecDir _ = return Nothing
+#endif
projects / ghc-hetmet.git / blobdiff