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/*
* (c) The GRASP/AQUA Project, Glasgow University, 1994-1998
*
* $Id: readFile.c,v 1.10 2000/01/18 12:42:12 simonmar Exp $
*
* hGetContents Runtime Support
*/
#include "Rts.h"
#include "stgio.h"
#if defined(HAVE_WINSOCK_H) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
#define USE_WINSOCK
#endif
#ifdef USE_WINSOCK
#include <winsock.h>
#endif
#define EOT 4
/* Filling up a (block-buffered) buffer, that
is completely empty. */
StgInt
readBlock(StgForeignPtr ptr)
{
IOFileObject* fo = (IOFileObject*)ptr;
int count,rc=0;
int fd;
/* Check if someone hasn't zapped us */
if ( fo == NULL || fo->fd == -1 )
return -2;
fd = fo->fd;
if ( FILEOBJ_IS_EOF(fo) ) {
ghc_errtype = ERR_EOF;
ghc_errstr = "";
return -1;
}
/* Weird case: buffering has suddenly been turned off.
Return non-std value and deal with this case on the Haskell side.
*/
if ( FILEOBJ_UNBUFFERED(fo) ) {
return -3;
}
/* if input stream is connect to an output stream, flush this one first. */
if ( fo->connectedTo != NULL &&
fo->connectedTo->fd != -1 &&
(fo->connectedTo->flags & FILEOBJ_WRITE)
) {
rc = flushFile((StgForeignPtr)fo->connectedTo);
}
if (rc < 0) return (rc == FILEOBJ_BLOCKED_WRITE ? FILEOBJ_BLOCKED_CONN_WRITE : rc);
/* RW object: flush the (output) buffer first. */
if ( FILEOBJ_WRITEABLE(fo) && FILEOBJ_JUST_WRITTEN(fo) && FILEOBJ_NEEDS_FLUSHING(fo) ) {
rc = flushBuffer(ptr);
if (rc < 0) return rc;
}
fo->flags = (fo->flags & ~FILEOBJ_RW_WRITE) | FILEOBJ_RW_READ;
/* return the unread parts of the file buffer..*/
if ( fo->flags & FILEOBJ_READ &&
fo->bufRPtr > 0 &&
fo->bufWPtr > fo->bufRPtr ) {
count = fo->bufWPtr - fo->bufRPtr;
fo->bufRPtr=0;
return count;
}
#if 0
fprintf(stderr, "rb: %d %d %d\n", fo->bufRPtr, fo->bufWPtr, fo->bufSize);
#endif
while ((count =
(
#ifdef USE_WINSOCK
fo->flags & FILEOBJ_WINSOCK ?
recv(fd, fo->buf, fo->bufSize, 0) :
read(fd, fo->buf, fo->bufSize))) <= 0 ) {
#else
read(fd, fo->buf, fo->bufSize))) <= 0 ) {
#endif
if ( count == 0 ) {
FILEOBJ_SET_EOF(fo);
ghc_errtype = ERR_EOF;
ghc_errstr = "";
return -1;
} else if ( count == -1 && errno == EAGAIN) {
errno = 0;
return FILEOBJ_BLOCKED_READ;
} else if ( count == -1 && errno != EINTR) {
cvtErrno();
stdErrno();
return -1;
}
}
fo->bufWPtr = count;
fo->bufRPtr = 0;
return count;
}
/* Filling up a (block-buffered) buffer of length len */
StgInt
readChunk(StgForeignPtr ptr, StgAddr buf, StgInt len)
{
IOFileObject* fo = (IOFileObject*)ptr;
int count=0,rc=0, total_count;
int fd;
char* p;
/* Check if someone hasn't zapped us */
if ( fo == NULL )
return -2;
fd = fo->fd;
if ( fd == -1 ) /* File has been closed for us */
return -2;
if ( FILEOBJ_IS_EOF(fo) ) {
ghc_errtype = ERR_EOF;
ghc_errstr = "";
return -1;
}
/* if input stream is connect to an output stream, flush it first */
if ( fo->connectedTo != NULL &&
fo->connectedTo->fd != -1 &&
(fo->connectedTo->flags & FILEOBJ_WRITE)
) {
rc = flushFile((StgForeignPtr)fo->connectedTo);
}
if (rc < 0) return (rc == FILEOBJ_BLOCKED_WRITE ? FILEOBJ_BLOCKED_CONN_WRITE : rc);
/* RW object: flush the (output) buffer first. */
if ( FILEOBJ_WRITEABLE(fo) && FILEOBJ_JUST_WRITTEN(fo) && FILEOBJ_NEEDS_FLUSHING(fo) ) {
rc = flushBuffer(ptr);
if (rc < 0) return rc;
}
fo->flags = (fo->flags & ~FILEOBJ_RW_WRITE) | FILEOBJ_RW_READ;
/* copy the unread parts of the file buffer..*/
if ( FILEOBJ_READABLE(fo) &&
fo->bufRPtr > 0 &&
fo->bufWPtr >= fo->bufRPtr ) {
count = ( len < (fo->bufWPtr - fo->bufRPtr)) ? len : (fo->bufWPtr - fo->bufRPtr);
memcpy(buf,fo->buf, count);
fo->bufWPtr=0;
fo->bufRPtr=0;
}
if (len - count <= 0)
return count;
len -= count;
p = buf;
p += count;
total_count = count;
while ((count =
(
#ifdef USE_WINSOCK
fo->flags & FILEOBJ_WINSOCK ?
recv(fd, p, len, 0) :
read(fd, p, len))) <= 0 ) {
#else
read(fd, p, len))) <= 0 ) {
#endif
if ( count == 0 ) { /* EOF */
break;
} else if ( count == -1 && errno == EAGAIN) {
/* ToDo: partial/blocked reads?????? Looks like we don't recover
* from this properly.
*/
errno = 0;
return FILEOBJ_BLOCKED_READ;
} else if ( count == -1 && errno != EINTR) {
cvtErrno();
stdErrno();
return -1;
}
total_count += count;
len -= count;
p += count;
}
total_count += count;
/* ToDo: might point beyond the end of the buffer??? */
fo->bufWPtr = total_count;
fo->bufRPtr = 0;
return total_count;
}
/*
readLine() tries to fill the buffer up with a line of chars, returning
the length of the resulting line.
Users of readLine() should immediately afterwards copy out the line
from the buffer.
*/
StgInt
readLine(StgForeignPtr ptr)
{
IOFileObject* fo = (IOFileObject*)ptr;
int rc=0, count;
/* Check if someone hasn't zapped us */
if ( fo == NULL || fo->fd == -1 )
return -2;
if ( FILEOBJ_IS_EOF(fo) ) {
ghc_errtype = ERR_EOF;
ghc_errstr = "";
return -1;
}
/* Weird case: buffering has been turned off.
Return non-std value and deal with this case on the Haskell side.
*/
if ( FILEOBJ_UNBUFFERED(fo) ) {
return -3;
}
/* if input stream is connect to an output stream, flush it first */
if ( fo->connectedTo != NULL &&
fo->connectedTo->fd != -1 &&
(fo->connectedTo->flags & FILEOBJ_WRITE)
) {
rc = flushFile((StgForeignPtr)fo->connectedTo);
}
if (rc < 0) return (rc == FILEOBJ_BLOCKED_WRITE ? FILEOBJ_BLOCKED_CONN_WRITE : rc);
/* RW object: flush the (output) buffer first. */
if ( FILEOBJ_WRITEABLE(fo) && FILEOBJ_JUST_WRITTEN(fo) ) {
rc = flushBuffer(ptr);
if (rc < 0) return rc;
}
fo->flags = (fo->flags & ~FILEOBJ_RW_WRITE) | FILEOBJ_RW_READ;
if ( fo->bufRPtr < 0 || fo->bufRPtr >= fo->bufWPtr ) { /* Buffer is empty */
fo->bufRPtr=0; fo->bufWPtr=0;
rc = fill_up_line_buffer(fo);
if (rc < 0) return rc;
}
while (1) {
unsigned char* s1 = memchr((unsigned char *)fo->buf+fo->bufRPtr, '\n', fo->bufWPtr - fo->bufRPtr);
if (s1 != NULL ) { /* Found one */
/* Note: we *don't* zero terminate the line */
count = s1 - ((unsigned char*)fo->buf + fo->bufRPtr) + 1;
fo->bufRPtr += count;
return count;
} else {
/* Just return partial line */
count = fo->bufWPtr - fo->bufRPtr;
fo->bufRPtr += count;
return count;
}
}
}
StgInt
readChar(StgForeignPtr ptr)
{
IOFileObject* fo= (IOFileObject*)ptr;
int count,rc=0;
unsigned char c;
/* Check if someone hasn't zapped us */
if ( fo == NULL || fo->fd == -1)
return -2;
if ( FILEOBJ_IS_EOF(fo) ) {
ghc_errtype = ERR_EOF;
ghc_errstr = "";
return -1;
}
/* Buffering has been changed, report back */
if ( FILEOBJ_LINEBUFFERED(fo) ) {
return -3;
} else if ( FILEOBJ_BLOCKBUFFERED(fo) ) {
return -4;
}
/* if input stream is connect to an output stream, flush it first */
if ( fo->connectedTo != NULL &&
fo->connectedTo->fd != -1 &&
(fo->connectedTo->flags & FILEOBJ_WRITE)
) {
rc = flushFile((StgForeignPtr)fo->connectedTo);
}
if (rc < 0) return (rc == FILEOBJ_BLOCKED_WRITE ? FILEOBJ_BLOCKED_CONN_WRITE : rc);
/* RW object: flush the (output) buffer first. */
if ( FILEOBJ_WRITEABLE(fo) && FILEOBJ_JUST_WRITTEN(fo) && FILEOBJ_NEEDS_FLUSHING(fo) ) {
rc = flushBuffer(ptr);
if (rc < 0) return rc;
}
fo->flags = (fo->flags & ~FILEOBJ_RW_WRITE) | FILEOBJ_RW_READ;
while ( (count =
(
#ifdef USE_WINSOCK
fo->flags & FILEOBJ_WINSOCK ?
recv(fo->fd, &c, 1, 0) :
read(fo->fd, &c, 1))) <= 0 ) {
#else
read(fo->fd, &c, 1))) <= 0 ) {
#endif
if ( count == 0 ) {
ghc_errtype = ERR_EOF;
ghc_errstr = "";
return -1;
} else if ( count == -1 && errno == EAGAIN) {
errno = 0;
return FILEOBJ_BLOCKED_READ;
} else if ( count == -1 && errno != EINTR) {
cvtErrno();
stdErrno();
return -1;
}
}
if ( isatty(fo->fd) && c == EOT ) {
return EOF;
} else {
return (int)c;
}
}
|
