"
COPYRIGHT (c) 1988 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
ReadWriteStream subclass:#ExternalStream
instanceVariableNames:'filePointer mode buffered binary useCRLF hitEOF didWrite'
classVariableNames:'Lobby LastErrorNumber'
poolDictionaries:''
category:'Streams-External'
!
ExternalStream comment:'
COPYRIGHT (c) 1988 by Claus Gittinger
All Rights Reserved
$Header: /cvs/stx/stx/libbasic/ExternalStream.st,v 1.20 1994-08-11 21:36:34 claus Exp $
'!
%{
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#ifdef hpux
# define fileno(f) ((f->__fileH << 8) | (f->__fileL))
#endif
%}
!ExternalStream class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 1988 by Claus Gittinger
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
version
"
$Header: /cvs/stx/stx/libbasic/ExternalStream.st,v 1.20 1994-08-11 21:36:34 claus Exp $
"
!
documentation
"
ExternalStream defines protocol common to Streams which have a file-descriptor and
represent some file or communicationChannel of the underlying OperatingSystem.
ExternalStream is abstract; concrete classes are FileStream, PipeStream etc.
ExternalStreams can be in two modes: text (the default) and binary.
In text-mode, the elements read/written are characters;
while in binary-mode the basic elements are bytes which read/write as SmallIntegers
in the range 0..255.
Also, the stream can be either in buffered or unbuffered mode. In buffered mode,
data is not written until either a cr is written (in text mode) or a synchronizeOutput
is sent (in both modes).
The underlying OperatingSystem streams may either be closed explicitely (sending a close)
or just forgotten - in this case, the garbage collector will eventually collect the
object AND a close will be performed automatically (but you will NOT know when this
happens - so it is recommended, that you close your files when no longer needed).
Closing is also suggested since if smalltalk is finished (be it by purpose, or due to
some crash) the data will not be in the file, if unclosed.
All streams understand the close message, so it never hurts to use it (it is defined as
a noop in one of the superclasses).
Most of the methods found here redefine inherited methods for better performance,
since I/O from/to files should be fast.
Recovering a snapshot:
not all streams can be restored to the state they had before - see the implementation of
reOpen in subclasses for more information.
For streams sitting on some communication channel (i.e. Pipes and Sockets) you should
reestablish the stream upon image restart (make someone dependent on ObjectMemory).
Instance variables:
filePointer <Integer> the unix FILE*; somehow mapped to an integer
(notice: not the fd)
mode <Symbol> #readwrite, #readonly or #writeonly
buffered <Boolean> true, if buffered (i.e. collects characters - does
not output immediately)
binary <Boolean> true if in binary mode (reads bytes instead of chars)
useCRLF <Boolean> true, if lines should be terminated with crlf instead
of lf. (i.e. if file is an MSDOS-type file)
hitEOF <Boolean> true, if EOF was reached
Class variables:
Lobby <Registry> keeps track of used ext-streams (to free up FILE*'s)
LastErrorNumber <Integer> the value of errno (only valid right after the error -
updated with next i/o operation)
Question: should lastErrorNumber be kept instance-specific ?
"
! !
!ExternalStream class methodsFor:'initialization'!
initialize
Lobby isNil ifTrue:[
Lobby := Registry new.
"want to get informed when returning from snapshot"
ObjectMemory addDependent:self
]
!
reOpenFiles
"reopen all files (if possible) after a snapShot load"
Lobby contentsDo:[:aFileStream |
aFileStream reOpen
]
!
update:something
"have to reopen files when returning from snapshot"
something == #returnFromSnapshot ifTrue:[
self reOpenFiles
]
! !
!ExternalStream class methodsFor:'instance creation'!
new
|newStream|
newStream := self basicNew.
newStream text; buffered:true; useCRLF:false; clearEOF.
^ newStream
! !
!ExternalStream class methodsFor:'error handling'!
lastErrorNumber
"return the last error"
^ LastErrorNumber
!
lastErrorString
"return a message string describing the last error"
^ OperatingSystem errorTextForNumber:LastErrorNumber
"
ExternalStream lastErrorString
"
! !
!ExternalStream methodsFor:'instance release'!
disposed
"some Stream has been collected - close the file if not already done"
self closeFile
!
closeFile
"low level close - may be redefined in subclasses"
%{ /* NOCONTEXT */
if (_INST(filePointer) != nil) {
extern int _immediateInterrupt;
_immediateInterrupt = 1;
fclose(MKFD(_INST(filePointer)));
_immediateInterrupt = 0;
}
%}
! !
!ExternalStream methodsFor:'private'!
clearEOF
hitEOF := false
!
reOpen
"sent after snapin to reopen streams.
cannot reopen here since I am abstract and have no device knowledge"
self class name errorPrint. ': cannot reOpen stream - stream closed' errorPrintNewline.
filePointer := nil.
Lobby unregister:self.
! !
!ExternalStream methodsFor:'error handling'!
lastErrorNumber
"return the last error"
^ LastErrorNumber
!
lastErrorString
"return a message string describing the last error"
^ self class lastErrorString
!
errorNotOpen
"report an error, that the stream has not been opened"
^ self error:(self class name , ' not open')
!
errorReadOnly
"report an error, that the stream is a readOnly stream"
^ self error:(self class name , ' is readonly')
!
errorWriteOnly
"report an error, that the stream is a writeOnly stream"
^ self error:(self class name , ' is writeonly')
!
errorNotBinary
"report an error, that the stream is not in binary mode"
^ self error:(self class name , ' is not in binary mode')
!
errorBinary
"report an error, that the stream is in binary mode"
^ self error:(self class name , ' is in binary mode')
!
errorNotBuffered
"report an error, that the stream is not in buffered mode"
^ self error:(self class name , ' is unbuffered - operation not allowed')
!
argumentMustBeInteger
"report an error, that the argument must be an integer"
^ self error:'argument must be an integer'
!
argumentMustBeCharacter
"report an error, that the argument must be a character"
^ self error:'argument must be a character'
!
argumentMustBeString
"report an error, that the argument must be a string"
^ self error:'argument must be a string'
! !
!ExternalStream methodsFor:'accessing'!
readonly
"set access mode to readonly"
mode := #readonly
!
writeonly
"set access mode to writeonly"
mode := #writeonly
!
readwrite
"set access mode to readwrite"
mode := #readwrite
!
filePointer
"return the filePointer of the receiver -
notice: for portability stdio is used; this means you will get
a FILE * - not a fileDescriptor.
(what you really get is a corresponding integer)"
^ filePointer
!
fileDescriptor
"return the fileDescriptor of the receiver -
notice: this one returns the underlying OSs fileDescriptor -
this may not be available on all platforms (i.e. non unix systems)."
%{ /* NOCONTEXT */
FILE *f;
if (_INST(filePointer) != nil) {
f = MKFD(_INST(filePointer));
RETURN ( MKOBJ(fileno(f)) );
}
%}
.
^ self errorNotOpen
!
buffered:aBoolean
"turn buffering on or off - default is on"
buffered := aBoolean
!
useCRLF:aBoolean
"turn on or off CRLF sending (instead of LF only) - default is off"
useCRLF := aBoolean
!
binary
"switch to binary mode - default is text"
binary := true
!
text
"switch to text mode - default is text"
binary := false
!
contentsSpecies
"return the kind of object to be returned by sub-collection builders
(such as upTo)"
binary ifTrue:[
^ ByteArray
].
^ String
!
contents
"return the contents of the file from the current position up-to
the end. If the stream is in binary mode, a ByteArray containing
the byte values is returned.
In text-mode, a collection of strings, each representing one line,
is returned."
|text l chunks sizes chunk byteCount cnt bytes offset|
binary ifTrue:[
"adding to a ByteArray produces quadratic time-space
behavior - therefore we allocate chunks, and concatenate them
at the end."
chunks := OrderedCollection new.
sizes := OrderedCollection new.
byteCount := 0.
[self atEnd] whileFalse:[
chunk := ByteArray uninitializedNew:4096.
cnt := self nextBytes:(chunk size) into:chunk.
cnt notNil ifTrue:[
chunks add:chunk.
sizes add:cnt.
byteCount := byteCount + cnt
]
].
"now, create one big ByteArray"
bytes := ByteArray uninitializedNew:byteCount.
offset := 1.
1 to:chunks size do:[:index |
chunk := chunks at:index.
cnt := sizes at:index.
bytes replaceFrom:offset to:(offset + cnt - 1) with:chunk.
offset := offset + cnt
].
^ bytes
].
text := Text new.
[self atEnd] whileFalse:[
l := self nextLine.
l notNil ifTrue:[
text add:l
]
].
^ text
! !
!ExternalStream methodsFor:'misc functions'!
open
"open the stream
- this must be redefined in subclass"
^ self subclassResponsibility
!
close
"close the stream - tell operating system"
filePointer isNil ifTrue:[^ self].
Lobby unregister:self.
self closeFile.
filePointer := nil
!
create
"create the stream
- this must be redefined in subclass"
^ self subclassResponsibility
!
position
"return the position
- this must be redefined in subclass"
^ self subclassResponsibility
!
position:anInteger
"set the position
- this must be redefined in subclass"
^ self subclassResponsibility
!
backStep
"step back one element -
redefined, since position is redefined here"
self position:(self position - 1)
!
blocking:aBoolean
"set/clear the blocking attribute - if set (which is the default)
a read (using next) on the receiver will block until data is available.
If cleared, a read operation will immediately return with a value of
nil."
filePointer isNil ifTrue:[^ self errorNotOpen].
^ OperatingSystem setBlocking:aBoolean on:(self fileDescriptor)
!
async:aBoolean
"set/clear the async attribute - if set the availability of data on
the receiver will trigger an ioInterrupt.
If cleared (which is the default) no special notification is made."
filePointer isNil ifTrue:[^ self errorNotOpen].
aBoolean ifTrue:[
^ OperatingSystem enableIOInterruptsOn:(self fileDescriptor)
].
^ OperatingSystem disableIOInterruptsOn:(self fileDescriptor)
!
ioctl:ioctlNumber
"to provide a simple ioctl facility - an ioctl is performed
on the underlying file; no arguments are passed."
%{ /* NOCONTEXT */
FILE *f;
int ret, ioNum, ioArg;
extern int _immediateInterrupt;
extern errno;
if (_INST(filePointer) != nil) {
if (_isSmallInteger(ioctlNumber)) {
ioNum = _intVal(ioctlNumber);
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
do {
ret = ioctl(fileno(f), ioNum);
} while ((ret < 0) && (errno == EINTR));
_immediateInterrupt = 0;
if (ret >= 0) {
RETURN ( _MKSMALLINT(ret) );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
self primitiveFailed
!
ioctl:ioctlNumber with:arg
"to provide a simple ioctl facility - an ioctl is performed
on the underlying file; the argument is passed as argument.
If the argument is a number, its directly passed; if its a
kind of ByteArray (ByteArray, String or Structure) a pointer to
the data is passed. This allows performing most ioctls - however,
it might be tricky to setup the buffer."
|isStructure|
isStructure := arg isKindOf:ByteArray.
%{
FILE *f;
int ret, ioNum;
extern int _immediateInterrupt;
extern errno;
if (_INST(filePointer) != nil) {
if (_isSmallInteger(ioctlNumber)
&& (_isSmallInteger(arg) || (isStructure == true))) {
f = MKFD(_INST(filePointer));
ioNum = _intVal(ioctlNumber);
_immediateInterrupt = 1;
do {
if (isStructure == true) {
ret = ioctl(fileno(f), ioNum, _ByteArrayInstPtr(arg)->ba_element);
} else {
ret = ioctl(fileno(f), ioNum, _intVal(arg));
}
} while ((ret < 0) && (errno == EINTR));
_immediateInterrupt = 0;
if (ret >= 0) {
RETURN ( _MKSMALLINT(ret) );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
self primitiveFailed
! !
!ExternalStream methodsFor:'non homogenous reading'!
nextByte
"read the next byte and return it as an Integer; return nil on error.
This is allowed in both text and binary modes, always returning the
bytes binary value as an integer in 0..255."
%{ /* NOCONTEXT */
FILE *f;
unsigned char byte;
int cnt;
extern errno;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
do {
if (_INST(buffered) == false) {
cnt = read(fileno(f), &byte, 1);
} else {
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fread(&byte, 1, 1, f);
}
} while ((cnt < 0) && (errno == EINTR));
_immediateInterrupt = 0;
if (cnt == 1) {
if (_INST(position) != nil)
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 1);
RETURN ( _MKSMALLINT(byte) );
}
if (cnt < 0) {
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
}
_INST(hitEOF) = true;
RETURN ( nil );
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
self errorWriteOnly
!
nextBytesInto:anObject
"read bytes into an object, regardless of binary/text mode.
The number of bytes to read is defined by the objects size.
Return the number of bytes written or nil on error. On EOF, 0 is returned.
The object must have non-pointer indexed instvars
(i.e. it must be a ByteArray, String, Float- or DoubleArray).
Use with care - non object oriented i/o."
^ self nextBytes:(anObject size) into:anObject startingAt:1
" to read 100 bytes from a stream:"
"
|b aStream|
aStream := 'smalltalk.rc' asFilename readStream.
b := ByteArray new:100.
aStream nextBytesInto:b.
aStream close.
b inspect
"
"
|s aStream|
aStream := 'smalltalk.rc' asFilename readStream.
s := String new:100.
aStream nextBytesInto:s.
aStream close.
s inspect
"
!
nextBytes:count into:anObject
"read the next count bytes into an object and return the number of
bytes read or nil on error. On EOF, 0 is returned.
The object must have non-pointer indexed instvars (i.e. it must be
a ByteArray, String, Float- or DoubleArray).
Use with care - non object oriented i/o."
^ self nextBytes:count into:anObject startingAt:1
!
nextBytes:count into:anObject startingAt:start
"read the next count bytes into an object and return the number of
bytes read or nil on error. On EOF, 0 is returned.
The object must have non-pointer indexed instvars (i.e. it must be
a ByteArray, String, Float- or DoubleArray).
Use with care - non object oriented i/o."
%{ /* NOCONTEXT */
FILE *f;
int cnt, offs;
int objSize, nInstVars, nInstBytes;
char *cp;
extern errno;
OBJ pos;
extern int _immediateInterrupt;
OBJ oClass;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
if (_isSmallInteger(count) && _isSmallInteger(start)) {
oClass = _Class(anObject);
switch (_intVal(_ClassInstPtr(oClass)->c_flags) & ARRAYMASK) {
case BYTEARRAY:
case WORDARRAY:
case LONGARRAY:
case FLOATARRAY:
case DOUBLEARRAY:
break;
default:
goto bad;
}
cnt = _intVal(count);
offs = _intVal(start) - 1;
f = MKFD(_INST(filePointer));
nInstVars = _intVal(_ClassInstPtr(oClass)->c_ninstvars);
nInstBytes = OHDR_SIZE + __OBJS2BYTES__(nInstVars);
objSize = _Size(anObject) - nInstBytes;
if ((offs >= 0) && (cnt >= 0) && (objSize >= (cnt + offs))) {
cp = (char *)_InstPtr(anObject) + nInstBytes + offs;
_immediateInterrupt = 1;
do {
if (_INST(buffered) == false) {
cnt = read(fileno(f), cp, cnt);
} else {
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fread(cp, 1, cnt, f);
}
} while ((cnt < 0) && (errno == EINTR));
_immediateInterrupt = 0;
if (cnt >= 0) {
if (cnt == 0)
_INST(hitEOF) = true;
else {
pos = _INST(position);
if (pos != nil)
_INST(position) = _MKSMALLINT(_intVal(pos) + cnt);
}
RETURN ( _MKSMALLINT(cnt) );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
}
bad: ;
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self primitiveFailed
!
nextWord
"in text-mode:
read the next word (i.e. up to non letter-or-digit).
return a string containing those characters.
in binary-mode:
read two bytes (msb-first) and return the value as a 16-bit unsigned Integer
(for compatibility with other smalltalks)"
%{ /* NOCONTEXT */
extern int _immediateInterrupt;
int _buffered;
_buffered = (_INST(buffered) == true);
/*
* binary mode
*/
if (_INST(binary) == true) {
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
FILE *f;
unsigned char hi, low;
int cnt;
OBJ pos;
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
if (_buffered) {
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
}
do {
if (! _buffered) {
cnt = read(fileno(f), &hi, 1);
} else {
cnt = fread(&hi, 1, 1, f);
}
} while ((cnt < 0) && (errno == EINTR));
if (cnt <= 0) {
_INST(hitEOF) = true;
if (cnt < 0)
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
_immediateInterrupt = 0;
RETURN ( nil );
}
do {
if (! _buffered) {
cnt = read(fileno(f), &low, 1);
} else {
cnt = fread(&low, 1, 1, f);
}
} while ((cnt < 0) && (errno == EINTR));
_immediateInterrupt = 0;
pos = _INST(position);
if (cnt <= 0) {
if (pos != nil) {
_INST(position) = _MKSMALLINT(_intVal(pos) + 1);
}
_INST(hitEOF) = true;
if (cnt < 0)
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( _MKSMALLINT(hi & 0xFF) );
}
if (pos != nil) {
_INST(position) = _MKSMALLINT(_intVal(pos) + 2);
}
RETURN ( _MKSMALLINT(((hi & 0xFF)<<8) | (low & 0xFF)) );
}
}
%}
.
%{ /* STACK: 2000 */
FILE *f;
int len;
char buffer[1024];
int ch;
int cnt = 0;
extern int _immediateInterrupt;
/*
* text mode
*/
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
for (;;) {
ch = getc(f);
cnt++;
if (ch >= ' ') break;
if ((ch != ' ') && (ch != '\t') && (ch != '\r')
&& (ch != '\n') && (ch != 0x0b)) break;
}
ungetc(ch, f);
cnt--;
len = 0;
for (;;) {
ch = getc(f);
if (ch == EOF) {
_INST(hitEOF) = true;
break;
}
ch &= 0xFF;
if (! (((ch >= 'a') && (ch <= 'z')) ||
((ch >= 'A') && (ch <= 'Z')) ||
((ch >= '0') && (ch <= '9')))) {
ungetc(ch, f);
break;
}
cnt++;
buffer[len++] = ch;
if (len >= sizeof(buffer)-1) {
/* emergency */
break;
}
}
_immediateInterrupt = 0;
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + cnt);
}
buffer[len] = '\0';
if (len != 0) {
RETURN ( _MKSTRING(buffer COMMA_CON) );
}
RETURN ( nil );
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
self errorWriteOnly
!
nextShortMSB:msbFlag
"Read two bytes and return the value as a 16-bit signed Integer.
If msbFlag is true, value is read with most-significant byte first, otherwise
least-significant byte comes first.
A nil is also returned, if endOfFile occurs after the first byte.
Works in both binary and text modes."
%{ /* NOCONTEXT */
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
FILE *f;
int first, second;
short value;
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
first = getc(f);
if (first == EOF) {
_immediateInterrupt = 0;
_INST(hitEOF) = true;
RETURN ( nil );
}
second = getc(f);
_immediateInterrupt = 0;
if (second == EOF) {
_INST(hitEOF) = true;
RETURN ( nil );
}
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 2);
}
if (msbFlag == true) {
RETURN ( _MKSMALLINT(((first & 0xFF)<<8) | (second & 0xFF)) );
}
RETURN ( _MKSMALLINT(((second & 0xFF)<<8) | (first & 0xFF)) );
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self primitiveFailed
!
nextUnsignedShortMSB:msbFlag
"Read two bytes and return the value as a 16-bit unsigned Integer.
If msbFlag is true, value is read with most-significant byte first, otherwise
least-significant byte comes first.
A nil is also returned, if endOfFile occurs after the first byte.
Works in both binary and text modes."
%{ /* NOCONTEXT */
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
FILE *f;
int first, second;
_immediateInterrupt = 1;
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
first = getc(f);
if (first == EOF) {
_immediateInterrupt = 0;
_INST(hitEOF) = true;
RETURN ( nil );
}
second = getc(f);
_immediateInterrupt = 0;
if (second == EOF) {
_INST(hitEOF) = true;
RETURN ( nil );
}
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 2);
}
if (msbFlag == true) {
RETURN ( _MKSMALLINT(((first & 0xFF)<<8) | (second & 0xFF)) );
}
RETURN ( _MKSMALLINT(((second & 0xFF)<<8) | (first & 0xFF)) );
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self primitiveFailed
!
nextLongMSB:msbFlag
"Read four bytes and return the value as a 32-bit signed Integer, which may be
a LargeInteger.
If msbFlag is true, value is read with most-significant byte first, otherwise
least-significant byte comes first.
A nil is returned, if endOfFile occurs before all 4 bytes have been read.
Works in both binary and text modes."
%{ /* NOCONTEXT */
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
FILE *f;
int first, second, third, fourth;
int value;
_immediateInterrupt = 1;
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
first = getc(f);
if (first == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
second = getc(f);
if (second == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
third = getc(f);
if (third == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
fourth = getc(f);
_immediateInterrupt = 0;
if (fourth == EOF) {
_INST(hitEOF) = true;
RETURN ( nil );
}
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 4);
}
if (msbFlag == true) {
value = ((first & 0xFF) << 24)
| ((second & 0xFF) << 16)
| ((third & 0xFF) << 8)
| (fourth & 0xFF);
} else {
value = ((fourth & 0xFF) << 24)
| ((third & 0xFF) << 16)
| ((second & 0xFF) << 8)
| (first & 0xFF);
}
if ((value >= _MIN_INT) && (value <= _MAX_INT)) {
RETURN ( _MKSMALLINT(value));
}
RETURN ( _makeLarge(value) );
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self primitiveFailed
!
nextUnsignedLongMSB:msbFlag
"Read four bytes and return the value as a 32-bit unsigned Integer, which may be
a LargeInteger.
If msbFlag is true, value is read with most-significant byte first, otherwise
least-significant byte comes first.
A nil is returned, if endOfFile occurs before all 4 bytes have been read.
Works in both binary and text modes."
%{ /* NOCONTEXT */
extern int _immediateInterrupt;
extern OBJ _makeULarge();
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
FILE *f;
int first, second, third, fourth;
unsigned int value;
_immediateInterrupt = 1;
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
first = getc(f);
if (first == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
second = getc(f);
if (second == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
third = getc(f);
if (third == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
fourth = getc(f);
_immediateInterrupt = 0;
if (fourth == EOF) {
_INST(hitEOF) = true;
RETURN ( nil );
}
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 4);
}
if (msbFlag == true) {
value = ((first & 0xFF) << 24)
| ((second & 0xFF) << 16)
| ((third & 0xFF) << 8)
| (fourth & 0xFF);
} else {
value = ((fourth & 0xFF) << 24)
| ((third & 0xFF) << 16)
| ((second & 0xFF) << 8)
| (first & 0xFF);
}
if (value <= _MAX_INT) {
RETURN ( _MKSMALLINT(value));
}
RETURN ( _makeULarge(value) );
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self primitiveFailed
!
nextLong
"Read four bytes (msb-first) and return the value as a 32-bit signed Integer.
The returned value may be a LargeInteger.
(msb-first for compatibility with other smalltalks)"
^ self nextLongMSB:true
! !
!ExternalStream methodsFor:'non homogenous writing'!
nextPutByte:aByteValue
"write a byte.
Works in both binary and text modes."
%{ /* NOCONTEXT */
FILE *f;
char c;
extern errno;
OBJ pos;
int cnt;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_isSmallInteger(aByteValue)) {
c = _intVal(aByteValue);
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), &c, 1);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(&c, 1, 1, f);
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
}
_immediateInterrupt = 0;
if (cnt == 1) {
pos = _INST(position);
if (pos != nil)
_INST(position) = _MKSMALLINT(_intVal(pos) + 1);
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN (nil);
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #readonly) ifTrue:[^ self errorReadOnly].
self primitiveFailed
!
nextPutBytesFrom:anObject
"write bytes from an object; the number of bytes is defined by
the objects size.
Return the number of bytes written or nil on error.
The object must have non-pointer indexed instvars
(i.e. be a ByteArray, String, Float- or DoubleArray).
Use with care - non object oriented i/o"
^ self nextPutBytes:(anObject size) from:anObject startingAt:1
!
nextPutBytes:count from:anObject
"write count bytes from an object.
Return the number of bytes written or nil on error.
The object must have non-pointer indexed instvars
(i.e. be a ByteArray, String, Float- or DoubleArray).
Use with care - non object oriented i/o"
^ self nextPutBytes:count from:anObject startingAt:1
!
nextPutBytes:count from:anObject startingAt:start
"write count bytes from an object starting at index start.
return the number of bytes written or nil on error.
The object must have non-pointer indexed instvars
(i.e. be a ByteArray, String, Float- or DoubleArray).
Use with care - non object oriented i/o"
%{ /* NOCONTEXT */
FILE *f;
int cnt, offs;
int objSize, nInstVars, nInstBytes;
char *cp;
extern errno;
OBJ oClass;
OBJ pos;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_isSmallInteger(count) && _isSmallInteger(start)) {
oClass = _Class(anObject);
switch (_intVal(_ClassInstPtr(oClass)->c_flags) & ARRAYMASK) {
case BYTEARRAY:
case WORDARRAY:
case LONGARRAY:
case FLOATARRAY:
case DOUBLEARRAY:
break;
default:
goto bad;
}
cnt = _intVal(count);
offs = _intVal(start) - 1;
f = MKFD(_INST(filePointer));
nInstVars = _intVal(_ClassInstPtr(oClass)->c_ninstvars);
nInstBytes = OHDR_SIZE + __OBJS2BYTES__(nInstVars);
objSize = _Size(anObject) - nInstBytes;
if ( (offs >= 0) && (cnt >= 0) && (objSize >= (cnt + offs)) ) {
cp = (char *)_InstPtr(anObject) + nInstBytes + offs;
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), cp, cnt);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(cp, 1, cnt, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt >= 0) {
pos = _INST(position);
if (pos != nil)
_INST(position) = _MKSMALLINT(_intVal(pos) + cnt);
RETURN ( _MKSMALLINT(cnt) );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
}
bad: ;
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #readonly) ifTrue:[^ self errorReadOnly].
self primitiveFailed
!
nextPutShort:aNumber MSB:msbFlag
"Write the argument, aNumber as a short (two bytes). If msbFlag is
true, data is written most-significant byte first; otherwise least
first. Returns the receiver on ok, nil on error.
Works in both binary and text modes."
%{ /* NOCONTEXT */
int num;
char bytes[2];
FILE *f;
extern errno;
extern int _immediateInterrupt;
int cnt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_isSmallInteger(aNumber)) {
num = _intVal(aNumber);
if (msbFlag == true) {
bytes[0] = (num >> 8) & 0xFF;
bytes[1] = num & 0xFF;
} else {
bytes[1] = (num >> 8) & 0xFF;
bytes[0] = num & 0xFF;
}
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), bytes, 2);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(bytes, 1, 2, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt == 2) {
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 2);
}
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
return ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #readonly) ifTrue:[^ self errorReadOnly].
self argumentMustBeInteger
!
nextPutLong:aNumber MSB:msbFlag
"Write the argument, aNumber as a long (four bytes). If msbFlag is
true, data is written most-significant byte first; otherwise least
first. Returns the receiver on ok, nil on error.
Works in both binary and text modes."
%{ /* NOCONTEXT */
int num;
char bytes[4];
FILE *f;
extern errno;
int cnt;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_isSmallInteger(aNumber)) {
num = _intVal(aNumber);
if (msbFlag == true) {
bytes[0] = (num >> 24) & 0xFF;
bytes[1] = (num >> 16) & 0xFF;
bytes[2] = (num >> 8) & 0xFF;
bytes[3] = num & 0xFF;
} else {
bytes[3] = (num >> 24) & 0xFF;
bytes[2] = (num >> 16) & 0xFF;
bytes[1] = (num >> 8) & 0xFF;
bytes[0] = num & 0xFF;
}
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), bytes, 4);
} else
#endif
{
cnt = fwrite(bytes, 1, 4, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt == 4) {
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 4);
}
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
return ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #readonly) ifTrue:[^ self errorReadOnly].
aNumber isInteger ifTrue:[
msbFlag ifTrue:[
"high word first"
(self nextShortPut:(aNumber // 16r10000) MSB:true) isNil ifTrue:[^ nil].
^ self nextShortPut:(aNumber \\ 16r10000) MSB:true
].
"low word first"
(self nextShortPut:(aNumber \\ 16r10000) MSB:false) isNil ifTrue:[^ nil].
^ self nextShortPut:(aNumber // 16r10000) MSB:false.
].
self argumentMustBeInteger
! !
!ExternalStream methodsFor:'reading'!
peek
"return the element to be read next without advancing read position.
In binary mode, an integer is returned, otherwise a character.
If there are no more elements, nil is returned.
Not allowed in unbuffered mode."
%{ /* NOCONTEXT */
FILE *f;
REGISTER int c;
extern int _immediateInterrupt;
if (_INST(filePointer) != nil) {
if (_INST(mode) != _writeonly) {
#ifdef OLD
if (_INST(buffered) == true)
#endif
{
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
_immediateInterrupt = 1;
c = getc(f);
_immediateInterrupt = 0;
if (c != EOF) {
ungetc(c, f);
if (_INST(binary) == true) {
RETURN ( _MKSMALLINT(c & 0xFF) );
}
RETURN ( _MKCHARACTER(c & 0xFF) );
}
_INST(hitEOF) = true;
RETURN ( nil );
}
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
buffered ifFalse:[^ self errorNotBuffered].
self errorWriteOnly
!
next
"return the next element; advance read position.
In binary mode, an integer is returned, otherwise a character.
If there are no more elements, nil is returned."
%{ /* NOCONTEXT */
FILE *f;
int c;
OBJ pos;
unsigned char ch;
extern int _immediateInterrupt;
if (_INST(filePointer) != nil) {
if (_INST(mode) != _writeonly) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
do {
#ifdef OLD
if (_INST(buffered) == false) {
if (read(fileno(f), &ch, 1) != 1)
c = EOF;
else
c = ch;
} else
#endif
{
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
c = getc(f);
}
} while ((c < 0) && (errno == EINTR));
_immediateInterrupt = 0;
if (c != EOF) {
pos = _INST(position);
if (_isSmallInteger(pos)) {
_INST(position) = _MKSMALLINT(_intVal(pos) + 1);
} else {
_INST(position) = nil;
}
if (_INST(binary) == true) {
RETURN ( _MKSMALLINT(c & 0xFF) );
}
RETURN ( _MKCHARACTER(c & 0xFF) );
}
_INST(hitEOF) = true;
_INST(position) = nil;
RETURN ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
self errorWriteOnly
!
next:count
"return the next count elements of the stream as a collection.
Redefined to return a String or ByteArray instead of the default Array."
|coll|
binary ifTrue:[
coll := ByteArray new:count
] ifFalse:[
coll := String new:count
].
1 to:count do: [:index |
coll at:index put:(self next)
].
^ coll
! !
!ExternalStream methodsFor:'writing'!
synchronizeOutput
"write all buffered data - for buffered mode only"
%{ /* NOCONTEXT */
if (_INST(filePointer) != nil) {
if (_INST(mode) != _readonly) {
if (_INST(buffered) == true) {
fflush( MKFD(_INST(filePointer)) );
}
}
}
%}
!
nextPut:aCharacter
"write the argument, aCharacter - return nil if failed, self if ok"
%{ /* NOCONTEXT */
FILE *f;
char c;
extern errno;
int cnt;
OBJ pos;
extern int _immediateInterrupt;
if (_INST(filePointer) != nil) {
if (_INST(mode) != _readonly) {
if (_INST(binary) != true) {
if (__isCharacter(aCharacter)) {
c = _intVal(_CharacterInstPtr(aCharacter)->c_asciivalue);
doWrite:
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), &c, 1);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(&c, 1, 1, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt == 1) {
pos = _INST(position);
if (pos != nil) {
_INST(position) = _MKSMALLINT(_intVal(pos) + 1);
}
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
} else {
if (_isSmallInteger(aCharacter)) {
c = _intVal(aCharacter);
goto doWrite;
}
}
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #readonly) ifTrue:[^ self errorReadOnly].
binary ifFalse:[^ self argumentMustBeCharacter].
^ self argumentMustBeInteger.
!
nextPutAll:aCollection
"write all elements of the argument, aCollection.
Reimplemented for speed when writing strings or byteArrays.
For others, falls back to general method in superclass."
%{ /* NOCONTEXT */
FILE *f;
unsigned char *cp;
int len, cnt;
extern errno;
OBJ pos;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
cp = NULL;
if (__isString(aCollection) || __isSymbol(aCollection)) {
cp = _stringVal(aCollection);
len = _stringSize(aCollection);
} else {
if (_INST(binary) == true) {
if (__isByteArray(aCollection)) {
cp = _ByteArrayInstPtr(aCollection)->ba_element;
len = _byteArraySize(aCollection);
} else {
if (__isBytes(aCollection)) {
int nInst;
cp = _ByteArrayInstPtr(aCollection)->ba_element;
len = _byteArraySize(aCollection);
nInst = _intVal(_ClassInstPtr(_qClass(aCollection))->c_ninstvars);
cp += __OBJS2BYTES__(nInst);
len -= __OBJS2BYTES__(nInst);
}
}
}
}
if (cp != NULL) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), cp, len);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(cp, 1, len, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt == len) {
pos = _INST(position);
if (pos != nil) {
_INST(position) = _MKSMALLINT(_intVal(pos) + len);
}
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
%}
.
^ super nextPutAll:aCollection
!
nextPutAll:aCollection startingAt:start to:stop
"write a range of elements of the argument, aCollection.
Reimplemented for speed when writing strings or byteArrays.
For others, falls back to general method in superclass."
%{ /* NOCONTEXT */
FILE *f;
unsigned char *cp;
int len, cnt, index1, index2;
extern errno;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_isSmallInteger(start) && _isSmallInteger(stop)) {
cp = NULL;
if (_INST(binary) != true) {
if (__isString(aCollection) || __isSymbol(aCollection)) {
cp = _stringVal(aCollection);
len = _stringSize(aCollection);
}
} else {
if (__isByteArray(aCollection)) {
cp = _ByteArrayInstPtr(aCollection)->ba_element;
len = _byteArraySize(aCollection);
} else {
if (__isBytes(aCollection)) {
int nInst;
cp = _ByteArrayInstPtr(aCollection)->ba_element;
len = _byteArraySize(aCollection);
nInst = _intVal(_ClassInstPtr(_qClass(aCollection))->c_ninstvars);
cp += __OBJS2BYTES__(nInst);
len -= __OBJS2BYTES__(nInst);
}
}
}
if (cp != NULL) {
f = MKFD(_INST(filePointer));
index1 = _intVal(start);
index2 = _intVal(stop);
if ((index1 < 1) || (index2 > len) || (index2 < index1)) {
RETURN ( self );
}
if (index2 > len)
index2 = len;
_immediateInterrupt = 1;
len = index2 - index1 + 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), cp + index1 - 1, len);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(cp + index1 - 1, 1, len, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt == len) {
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + len);
}
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
}
%}
.
^ super nextPutAll:aCollection startingAt:start to:stop
!
cr
"reimplemented for speed"
%{ /* NOCONTEXT */
FILE *f;
extern errno;
extern int _immediateInterrupt;
int cnt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_INST(binary) != true) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), "\n", 1);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite("\n", 1, 1, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
_immediateInterrupt = 0;
if (cnt == 1) {
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + 1);
}
RETURN ( self );
}
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
return ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #readonly) ifTrue:[^ self errorReadOnly].
self errorBinary
! !
!ExternalStream methodsFor:'line reading/writing'!
nextLine
"read the next line (characters up to newline).
Return a string containing those characters excluding the newline.
If the previous-to-last character is a cr, this is also removed,
so its possible to read alien (i.e. ms-dos) text as well.
The line must be shorter than 1K characters - otherwise its truncated."
%{ /* STACK:2000 */
FILE *f;
int len;
char buffer[1024];
extern int _immediateInterrupt;
char *rslt;
extern errno;
int fd, ch;
int _buffered;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
if (_INST(binary) != true) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
buffer[0] = 0;
_buffered = (_INST(buffered) == true);
/*
* mhmh - the following code looks ok to me,
* but seems not to work for sockets
*/
#ifdef DOES_NOT_WORK
if (_INST(mode) == _readwrite)
fseek(f, 0L, 1); /* needed in stdio */
do {
rslt = fgets(buffer, sizeof(buffer), f);
} while ((rslt == NULL) && (errno == EINTR));
#else
if (_buffered) {
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
}
rslt = buffer;
fd = fileno(f);
for (;;) {
if (_buffered) {
ch = getc(f);
if (ch == EOF)
len = 0;
else {
len = 1;
*rslt = ch;
}
} else {
do {
len = read(fd, rslt, 1);
} while ((len < 0) && (errno == EINTR));
}
if (len <= 0) {
if (rslt == buffer) {
rslt = NULL;
} else {
*rslt = '\0';
}
break;
}
rslt++;
if (*(rslt-1) == '\n') {
*rslt = '\0';
break;
}
if (rslt == (buffer + sizeof(buffer) - 1)) {
*rslt = '\0';
break;
}
}
#endif
_immediateInterrupt = 0;
if (rslt != NULL) {
len = strlen(buffer);
if (_INST(position) != nil) {
_INST(position) = _MKSMALLINT(_intVal(_INST(position)) + len + 1);
}
/* remove EOL character */
if ((len != 0) && (buffer[len-1] == '\n')) {
buffer[--len] = '\0';
}
if ((len != 0) && (buffer[len-1] == '\r')) {
buffer[--len] = '\0';
}
RETURN ( _MKSTRING(buffer COMMA_CON) );
}
_INST(hitEOF) = true;
RETURN ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self errorBinary
!
nextPutLine:aString
"write the characters in aString and append a newline"
%{ /* NOCONTEXT */
FILE *f;
int len, cnt;
OBJ pos;
char *s;
extern errno;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _readonly)) {
if (_INST(binary) != true) {
if (__isString(aString)) {
f = MKFD(_INST(filePointer));
s = (char *) _stringVal(aString);
len = _stringSize(aString);
_immediateInterrupt = 1;
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), s, len);
} else
#endif
{
if ((_INST(didWrite) != true) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = true;
fseek(f, 0L, 1); /* needed in stdio */
}
cnt = fwrite(s, 1, len, f);
}
if (cnt == len) {
#ifdef OLD
if (_INST(buffered) == false) {
cnt = write(fileno(f), "\n", 1);
} else
#endif
{
cnt = fwrite("\n", 1, 1, f);
}
#ifndef OLD
if (_INST(buffered) == false) {
fflush(f);
}
#endif
if (cnt == 1) {
pos = _INST(position);
if (pos != nil) {
_INST(position) = _MKSMALLINT(_intVal(pos)+len+1);
}
_immediateInterrupt = 0;
RETURN ( self );
}
}
_immediateInterrupt = 0;
ExternalStream_LastErrorNumber = _MKSMALLINT(errno);
RETURN ( nil );
}
}
}
%}
.
super nextPutAll:aString.
self cr.
!
nextPutLinesFrom:aStream upToLineStartingWith:aStringOrNil
"read from aStream up to and including a line starting with aStringOrNil
and append it to self.
can be used to copy/create large files or copy from a pipe/socket.
If aStringOrNil is nil or not matched, copy preceeds to the end.
(this allows for example to read a Socket and transfer the data quickly
into a file - without creating zillions of temporary strings)"
|srcFilePointer|
(mode == #readonly) ifTrue:[^ self errorReadOnly].
filePointer isNil ifTrue:[^ self errorNotOpen].
srcFilePointer := aStream filePointer.
srcFilePointer isNil ifTrue:[^ aStream errorNotOpen].
%{ /* STACK:2000 */
FILE *dst, *src;
char *matchString;
int matchLen = 0;
char buffer[1024];
extern int _immediateInterrupt;
if (_isSmallInteger(srcFilePointer)
#ifdef OLD
&& (_INST(buffered) == true)
#endif
) {
if ((aStringOrNil == nil) || __isString(aStringOrNil)) {
if (aStringOrNil != nil) {
matchString = (char *) _stringVal(aStringOrNil);
matchLen = _stringSize(aStringOrNil);
}
dst = MKFD(_INST(filePointer));
src = (FILE *)_intVal(srcFilePointer);
_immediateInterrupt = 1;
for (;;) {
if (fgets(buffer, sizeof(buffer), src) == NULL) break;
if (fputs(buffer, dst) == EOF) break;
#ifndef OLD
if (_INST(buffered) == false) {
fflush(dst);
}
#endif
if (matchLen) {
if (strncmp(matchString, buffer, matchLen) == 0)
break;
}
}
_immediateInterrupt = 0;
_INST(position) = nil;
RETURN ( self );
}
}
%}
.
buffered ifFalse:[^ self errorNotBuffered].
^ self primitiveFailed
!
peekForLineStartingWith:aString
"read ahead for next line starting with aString;
return the line-string if found, nil otherwise.
Do not advance position i.e. nextLine will reread this line"
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
filePointer isNil ifTrue:[^ self errorNotOpen].
binary ifTrue:[^ self errorBinary].
%{ /* STACK: 2000 */
FILE *f;
int l;
char buffer[1024];
char *cp;
char *matchString;
int firstpos = -1, lastpos;
extern int _immediateInterrupt;
if (__isString(aString)) {
matchString = (char *) _stringVal(aString);
l = _stringSize(aString);
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
for (;;) {
lastpos = ftell(f);
if (firstpos == -1) firstpos = lastpos;
_immediateInterrupt = 1;
do {
cp = fgets(buffer, sizeof(buffer), f);
} while ((cp == NULL) && (errno == EINTR));
_immediateInterrupt = 0;
if (cp == NULL) {
fseek(f, firstpos, 0);
RETURN ( nil );
}
if (strncmp(cp, matchString, l) == 0) {
fseek(f, lastpos, 0);
break;
}
}
/* remove EOL character */
cp = buffer;
while (*cp && (*cp != '\n')) cp++;
*cp = '\0';
RETURN ( _MKSTRING(buffer COMMA_CON) );
}
%}
.
self argumentMustBeString
!
peekForLineStartingWithAny:aCollectionOfStrings
"read ahead for next line starting with any of aCollectionOfStrings;
return the index in aCollection if found, nil otherwise..
If no match, do not change position; otherwise advance right before the
matched line so that nextLine will return this line."
|line startPos linePos index|
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
filePointer isNil ifTrue:[^ self errorNotOpen].
binary ifTrue:[^ self errorBinary].
startPos := self position.
[self atEnd] whileFalse:[
linePos := self position.
line := self nextLine.
index := 1.
aCollectionOfStrings do:[:prefix |
(line startsWith:prefix) ifTrue:[
self position:linePos.
^ index
].
index := index + 1
]
].
self position:startPos.
^ nil
! !
!ExternalStream methodsFor:'testing'!
atEnd
"return true, if position is at end"
%{ /* NOCONTEXT */
FILE *f;
OBJ t;
OBJ _true = true;
int c;
extern int _immediateInterrupt;
if (_INST(hitEOF) == _true) {
RETURN (_true);
}
if ((t = _INST(filePointer)) != nil) {
f = MKFD(t);
#ifdef OLD
RETURN ( feof(f) ? _true : false );
#else
_immediateInterrupt = 1;
c = getc(f);
_immediateInterrupt = 0;
if (c == EOF) {
_INST(hitEOF) = _true;
RETURN (_true);
}
ungetc(c, f);
RETURN (false);
#endif
}
%}
.
self errorNotOpen
!
canReadWithoutBlocking
"return true, if any data is available for reading (i.e.
a read operation will not block the smalltalk process), false otherwise."
|fd|
filePointer isNil ifTrue:[
^ self errorNotOpen
].
mode == #writeonly ifTrue:[
^ self errorWriteOnly
].
fd := self fileDescriptor.
^ OperatingSystem readCheck:fd
"
|pipe|
pipe := PipeStream readingFrom:'(sleep 10; echo hello)'.
pipe canReadWithoutBlocking ifTrue:[
Transcript showCr:'data available'
] ifFalse:[
Transcript showCr:'no data available'
].
pipe close
"
!
canWriteWithoutBlocking
"return true, if data can be written into the stream
(i.e. a write operation will not block the smalltalk process)."
|fd|
filePointer isNil ifTrue:[
^ self errorNotOpen
].
mode == #readonly ifTrue:[
^ self errorReadOnly
].
fd := self fileDescriptor.
^ OperatingSystem writeCheck:fd
! !
!ExternalStream methodsFor:'waiting for I/O'!
readWait
"suspend the current process, until the receiver
becomes ready for reading. If data is already available,
return immediate.
The other threads are not affected by the wait."
self readWaitWithTimeout:nil
!
readWaitWithTimeout:timeout
"suspend the current process, until the receiver
becomes ready for reading or a timeout (in seconds) expired.
If data is already available, return immediate.
Return true if data is available, false if not (i.e. a timeout occured).
The other threads are not affected by the wait."
|fd inputSema hasData wasBlocked|
filePointer isNil ifTrue:[
^ self errorNotOpen
].
mode == #writeonly ifTrue:[
^ self errorWriteOnly
].
fd := self fileDescriptor.
(OperatingSystem readCheck:fd) ifTrue:[^ true].
wasBlocked := OperatingSystem blockInterrupts.
hasData := OperatingSystem readCheck:fd.
hasData ifFalse:[
inputSema := Semaphore new.
timeout notNil ifTrue:[
Processor signal:inputSema afterSeconds:timeout
].
Processor signal:inputSema onInput:fd.
Processor activeProcess state:#ioWait.
inputSema wait.
Processor disableSemaphore:inputSema.
hasData := OperatingSystem readCheck:fd
].
wasBlocked ifFalse:[OperatingSystem unblockInterrupts].
^ hasData
!
writeWait
"suspend the current process, until the receiver
becomes ready for writing.
Return immediate if the receiver is already ready.
The other threads are not affected by the wait."
self writeWaitWithTimeout:nil
!
writeWaitWithTimeout:timeout
"suspend the current process, until the receiver
becomes ready for writing or a timeout (in seconds) expired.
Return true if data can be written, false if not (i.e. a timeout occured).
Return immediate if the receiver is already ready.
The other threads are not affected by the wait."
|fd outputSema canWrite wasBlocked|
filePointer isNil ifTrue:[
^ self errorNotOpen
].
mode == #readonly ifTrue:[
^ self errorReadOnly
].
fd := self fileDescriptor.
(OperatingSystem writeCheck:fd) ifTrue:[^ true].
wasBlocked := OperatingSystem blockInterrupts.
canWrite := OperatingSystem writeCheck:fd.
canWrite ifFalse:[
outputSema := Semaphore new.
timeout notNil ifTrue:[
Processor signal:outputSema afterSeconds:timeout
].
Processor signal:outputSema onOutput:fd.
Processor activeProcess state:#ioWait.
outputSema wait.
Processor disableSemaphore:outputSema.
canWrite := OperatingSystem writeCheck:fd
].
wasBlocked ifFalse:[OperatingSystem unblockInterrupts].
^ canWrite
! !
!ExternalStream methodsFor:'reimplemented for speed'!
peekFor:anObject
"return true and move past if next == something.
Otherwise, stay and return false."
%{ /* NOCONTEXT */
FILE *f;
int c;
int peekValue;
extern int _immediateInterrupt;
if (_INST(filePointer) != nil) {
if (_INST(binary) == true) {
if (_isSmallInteger(anObject)) {
peekValue = _intVal(anObject) & 0xFF;
} else {
goto bad;
}
} else {
if (__isCharacter(anObject)) {
peekValue = _intVal(_characterVal(anObject)) & 0xFF;
} else {
goto bad;
}
}
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
c = getc(f);
_immediateInterrupt = 0;
if (c == peekValue) {
OBJ pos;
if ((pos = _INST(position)) != nil) {
_INST(position) = _MKSMALLINT(_intVal(pos) + 1);
}
RETURN ( true );
}
if (c == EOF) {
_INST(hitEOF) = true;
} else {
ungetc(c, f);
}
RETURN ( false );
}
bad: ;
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
^ super peekFor:anObject
!
nextMatchFor:anObject
"skip all objects up-to and including anObject, return anObject on success,
nil if end-of-file is reached before. The next read operation will return
the element after anObject."
%{ /* NOCONTEXT */
FILE *f;
int peekValue, c;
extern int _immediateInterrupt;
if ((_INST(binary) == true) && _isSmallInteger(anObject)) {
peekValue = _intVal(anObject) & 0xFF;
} else {
if ((_INST(binary) != true) && __isCharacter(anObject)) {
peekValue = _intVal(_characterVal(anObject)) & 0xFF;
} else
peekValue = -1;
}
if (peekValue >= 0) {
if (_INST(filePointer) != nil) {
if (_INST(mode) != _writeonly) {
f = MKFD(_INST(filePointer));
_immediateInterrupt = 1;
_INST(position) = nil;
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
for (;;) {
c = getc(f);
if (c == EOF) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN (nil);
}
if (c == peekValue) {
_immediateInterrupt = 0;
RETURN (anObject);
}
}
_immediateInterrupt = 0;
}
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
^ super nextMatchFor:anObject
!
skipLine
"read the next line (characters up to newline) skip only;
return nil if EOF reached, self otherwise.
Not allowed in binary mode."
%{ /* STACK:2000 */
FILE *f;
char buffer[1024];
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
if (_INST(binary) != true) {
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
_immediateInterrupt = 1;
if (fgets(buffer, sizeof(buffer), f) != NULL) {
_immediateInterrupt = 0;
RETURN ( self );
}
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
binary ifTrue:[^ self errorBinary].
self errorWriteOnly
!
skipThroughAll:aString
"search & skip for the sequence given by the argument, aCollection;
return nil if not found, self otherwise. If successfull, the next read
will return the character after the searchstring."
|buffer len first|
(aString isString and:[binary not]) ifTrue:[
len := aString size.
first := aString at:1.
buffer := String new:len.
buffer at:1 put:first.
len := len - 1.
[true] whileTrue:[
(self skipThrough:first) isNil ifTrue:[
^ nil.
].
(self nextBytes:len into:buffer startingAt:2) == len ifFalse:[
^ nil
].
buffer = aString ifTrue:[
"
position back, before string
"
^ self
].
].
"NOT REACHED"
].
^ super skipThroughAll:aString
"
|s|
s := 'Makefile' asFilename readStream.
s skipThroughAll:'are'.
s next:10
"
!
skipToAll:aString
"skip for the sequence given by the argument, aCollection;
return nil if not found, self otherwise. On a successful match, next read
will return characters of aString."
|oldPos|
oldPos := self position.
(self skipThroughAll:aString) isNil ifTrue:[
"
restore position
"
self position:oldPos.
^ nil
].
"
position before match-string
"
self position:(self position - aString size).
^ self
"
|s|
s := 'Makefile' asFilename readStream.
s skipToAll:'are'.
s next:10
"
!
skipThrough:aCharacter
"skip all characters up-to and including aCharacter. Return the receiver if
skip was successfull, otherwise (i.e. if not found) return nil.
The next read operation will return the character after aCharacter.
The argument, aCharacter must be character, or integer wehn in binary mode."
%{ /* NOCONTEXT */
FILE *f;
REGISTER int c, cSearch;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
if (_INST(binary) == true) {
/* searched for object must be a smallInteger */
if (! _isSmallInteger(aCharacter)) goto badArgument;
cSearch = _intVal(aCharacter);
} else {
/* searched for object must be a character */
if (! __isCharacter(aCharacter)) goto badArgument;
cSearch = _intVal(_characterVal(aCharacter));
}
/* Q: should we just say: "not found" ? */
if ((cSearch < 0) || (cSearch > 255)) goto badArgument;
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
_immediateInterrupt = 1;
while (1) {
if (feof(f)) {
_immediateInterrupt = 0;
RETURN ( nil );
}
c = getc(f);
if (c < 0) {
_immediateInterrupt = 0;
_INST(hitEOF) = true;
RETURN (nil);
}
if (c == cSearch) {
_immediateInterrupt = 0;
RETURN (self);
}
}
}
badArgument: ;
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
"
argument must be integer/character in binary mode,
character in text mode
"
^ self error:'invalid argument'.
"
|s|
s := 'Makefile' asFilename readStream.
s skipThrough:$=.
s next:10
"
!
skipSeparators
"skip all whitespace; next will return next non-white-space character
or nil if endOfFile reached. Not allowed in binary mode.
- reimplemented for speed"
%{ /* NOCONTEXT */
FILE *f;
REGISTER int c;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
if (_INST(binary) != true) {
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
_immediateInterrupt = 1;
while (1) {
if (feof(f)) {
_immediateInterrupt = 0;
RETURN ( nil );
}
c = getc(f);
switch (c) {
case ' ':
case '\t':
case '\n':
case '\r':
case '\b':
case '\014':
break;
default:
if (c < 0) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
ungetc(c, f);
_immediateInterrupt = 0;
RETURN ( _MKCHARACTER(c & 0xFF) );
}
}
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
^ self errorBinary.
!
skipSeparatorsExceptCR
"skip all whitespace but no newlines;
next will return next non-white-space character
or nil if endOfFile reached. Not allowed in binary mode.
- reimplemented for speed"
%{ /* NOCONTEXT */
FILE *f;
int c;
extern int _immediateInterrupt;
if ((_INST(filePointer) != nil) && (_INST(mode) != _writeonly)) {
if (_INST(binary) != true) {
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
_immediateInterrupt = 1;
while (1) {
if (feof(f)) {
_immediateInterrupt = 0;
RETURN ( nil );
}
c = getc(f);
switch (c) {
case ' ':
case '\t':
case '\b':
break;
default:
if (c < 0) {
_INST(hitEOF) = true;
_immediateInterrupt = 0;
RETURN ( nil );
}
ungetc(c, f);
_immediateInterrupt = 0;
RETURN ( _MKCHARACTER(c & 0xFF) );
}
}
}
}
%}
.
filePointer isNil ifTrue:[^ self errorNotOpen].
(mode == #writeonly) ifTrue:[^ self errorWriteOnly].
self errorBinary
!
nextChunk
"return the next chunk, i.e. all characters up to the next
non-doubled exclamation mark; undouble doubled exclamation marks.
- reimplemented for speed"
|retVal|
filePointer isNil ifTrue:[
^ self errorNotOpen
].
binary ifTrue:[
^ self errorBinary
].
%{
FILE *f;
int done = 0;
REGISTER int c;
unsigned char peekC;
char *buffer, *newBuffer;
REGISTER int index;
int currSize;
int inComment, inString, inPrimitive = 0;
extern int _immediateInterrupt;
f = MKFD(_INST(filePointer));
if ((_INST(didWrite) != false) && (_INST(mode) == _readwrite)) {
_INST(didWrite) = false;
fseek(f, 0L, 1); /* needed in stdio */
}
/*
* skip spaces
*/
_immediateInterrupt = 1;
while (! done) {
if (feof(f)) {
_immediateInterrupt = 0;
RETURN ( nil );
}
do {
c = getc(f);
} while ((c < 0) && (errno == EINTR));
switch (c) {
case ' ':
case '\t':
case '\n':
case '\r':
case '\b':
case '\014':
break;
case EOF:
_immediateInterrupt = 0;
_INST(hitEOF) = true;
RETURN ( nil );
default:
ungetc(c, f);
done = 1;
break;
}
}
/*
* read chunk into a buffer
*/
buffer = (char *)malloc(3000);
currSize = 3000;
index = 0;
while (! feof(f)) {
/* do we have to resize the buffer ? */
if ((index+2) >= currSize) {
newBuffer = (char *)malloc(currSize * 2);
bcopy(buffer, newBuffer, index);
free(buffer);
buffer = newBuffer;
currSize = currSize * 2;
}
do {
c = getc(f);
} while (c < 0 && (errno == EINTR));
if (c == '%') {
peekC = getc(f);
ungetc(peekC, f);
if (peekC == '{') {
inPrimitive++;
} else if (peekC == '}') {
inPrimitive--;
}
} else {
if (! inPrimitive) {
if (c == '!') {
do {
c = getc(f);
} while (c < 0 && (errno == EINTR));
if (c != '!') {
ungetc(c, f);
break;
}
}
}
}
if (c == EOF) {
_INST(hitEOF) = true;
break;
}
buffer[index++] = c;
}
_immediateInterrupt = 0;
buffer[index] = '\0';
/*
* make it a string
*/
retVal = _MKSTRING(buffer COMMA_CON);
free(buffer);
%}
.
^ retVal
! !