blob: 5563115b6b9732da9c5ca8361ea8fbab1a8679d8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
import System.IO
import Foreign
import Foreign.C
main = do test True; test False
test blocking = do
h <- openBinaryFile "hGetBuf002.hs" ReadMode
let sz = 42
loop = do
b <- allocaBytes sz $ \ptr -> do
r <- (if blocking then hGetBuf else hGetBufNonBlocking) h ptr sz
if (r == 0)
then return True
else do s <- peekCStringLen (ptr,r)
putStr s
return False
if b then return () else loop -- tail call
loop
import System.IO
import Foreign
import Foreign.C
main = do test True; test False
test blocking = do
h <- openBinaryFile "hGetBuf002.hs" ReadMode
let sz = 42
loop = do
b <- allocaBytes sz $ \ptr -> do
r <- (if blocking then hGetBuf else hGetBufNonBlocking) h ptr sz
if (r == 0)
then return True
else do s <- peekCStringLen (ptr,r)
putStr s
return False
if b then return () else loop -- tail call
loop
|
