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82
Source/ostream.h
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82
Source/ostream.h
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/* objc_streams - C-function interface to Objective-C streams
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Copyright (C) 1993,1994, 1996 Free Software Foundation, Inc.
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Written by: Adam Fedor <fedor@boulder.colorado.edu>
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Date: Jun 1996
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __objc_stream_h_GNUSTEP_BASE_INCLUDE
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#define __objc_stream_h_GNUSTEP_BASE_INCLUDE
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#include <stdarg.h>
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#include <objc/typedstream.h>
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typedef struct _ostream {
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void* stream_obj;
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int flags;
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} ostream;
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/* Access modes */
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#define OSTREAM_READONLY 1 /* read on stream only */
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#define OSTREAM_WRITEONLY 2 /* write on stream only */
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#define OSTREAM_READWRITE 4 /* do read & write */
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#define OSTREAM_APPEND 8 /* append (write at end of file) */
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/* Seek modes */
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#define OSTREAM_SEEK_FROM_START 0
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#define OSTREAM_SEEK_FROM_CURRENT 1
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#define OSTREAM_SEEK_FROM_END 2
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/* Private flags */
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#define OSTREAM_READFLAG 1 /* stream is for reading */
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#define OSTREAM_WRITEFLAG (1 << 1) /* stream is for writing */
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#define OSTREAM_ISBUFFER (1 << 2)
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#define OSTREAM_USER_OWNS_BUF (1 << 3)
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#define OSTREAM_CANSEEK (1 << 4)
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extern int ostream_getc(ostream* s);
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extern void ostream_ungetc(ostream* s);
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extern int ostream_putc(ostream* s, int c);
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extern BOOL ostream_at_eos(ostream* s);
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extern char* ostream_gets(ostream* s, char* buf, int count);
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extern int ostream_flush(ostream *s);
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extern void ostream_seek(ostream *s, long offset, int mode);
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extern long ostream_tell(ostream *s);
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extern int ostream_read(ostream* s, void* buf, int count);
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extern int ostream_write(ostream* s, const void* buf, int count);
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extern void ostream_printf(ostream *s, const char *format, ...);
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extern void ostream_vprintf(ostream *s, const char *format, va_list argList);
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extern int ostream_scanf(ostream *s, const char *format, ...);
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extern int ostream_vscanf(ostream *s, const char *format, va_list argList);
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extern ostream *ostream_open_descriptor(int fd, int mode);
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extern ostream *ostream_open_memory(const char *addr, int size, int mode);
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extern ostream *ostream_map_file(const char *name, int mode);
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extern int ostream_save_to_file(ostream *s, const char *name);
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extern void ostream_get_memory_buffer(ostream *s, char **addr,
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int *len, int *maxlen);
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extern void ostream_close_memory(ostream *s, int option);
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extern void ostream_close(ostream *s);
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#define OSTREAM_FREEBUFFER 0
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#define OSTREAM_TRUNCATEBUFFER 1
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#define OSTREAM_SAVEBUFFER 2
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#endif /* __objc_stream_h_GNUSTEP_BASE_INCLUDE */
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344
Source/ostream.m
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344
Source/ostream.m
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/* objc_streams - C-function interface to Objective-C streams
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Copyright (C) 1993,1994, 1996 Free Software Foundation, Inc.
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Written by: Adam Fedor <fedor@boulder.colorado.edu>
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Date: Aug 1996
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdio.h>
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#include "gnustep/base/objc_streams.h"
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#include "gnustep/base/MemoryStream.h"
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#include "gnustep/base/StdioStream.h"
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#include "gnustep/base/String.h"
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#define OSTREAM_EOF EOF
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/* Handle a stream error - FIXME: not sure if this should throw an exception
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or what... */
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static void
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_ostream_error(const char* message)
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{
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fprintf(stderr, "ostream error: %s\n", message);
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}
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int
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ostream_getc(ostream* s)
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{
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char c = 0;
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if (s->flags & OSTREAM_READFLAG)
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[(id <Streaming>)s->stream_obj readByte: &c];
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else
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c = OSTREAM_EOF;
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return c;
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}
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void
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ostream_ungetc(ostream* s)
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{
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if ((s->flags & OSTREAM_READFLAG) && (s->flags & OSTREAM_CANSEEK))
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{
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long pos = [(id <SeekableStreaming>)s->stream_obj streamPosition];
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[(id <SeekableStreaming>)s->stream_obj setStreamPosition: pos-1];
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}
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else
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_ostream_error("Tried to unget on non-readable/non-seekable stream");
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}
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int
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ostream_putc(ostream* s, int c)
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{
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if (s->flags & OSTREAM_WRITEFLAG)
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return [(id <Streaming>)s->stream_obj writeByte: c];
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else
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return OSTREAM_EOF;
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}
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BOOL
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ostream_at_eos(ostream* s)
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{
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return [(id <Streaming>)s->stream_obj isAtEof];
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}
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int
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ostream_flush(ostream *s)
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{
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int pos;
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pos = [(id <Streaming>)s->stream_obj streamPosition];
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[(id <Streaming>)s->stream_obj flushStream];
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return [(id <Streaming>)s->stream_obj streamPosition] - pos;
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}
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void
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ostream_seek(ostream *s, long offset, int mode)
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{
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if (!(s->flags & OSTREAM_CANSEEK))
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return;
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[(id <SeekableStreaming>)s->stream_obj setStreamPosition: offset
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seekMode: (mode - OSTREAM_SEEK_FROM_START + STREAM_SEEK_FROM_START)];
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}
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long
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ostream_tell(ostream *s)
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{
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return [(id <Streaming>)s->stream_obj streamPosition];
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}
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int
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ostream_read(ostream* s, void* buf, int count)
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{
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assert(buf); /* xxxFIXME: should be an exception ? */
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if (s->flags & OSTREAM_READFLAG)
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return [(id <Streaming>)s->stream_obj readBytes: buf length: count];
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return OSTREAM_EOF;
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}
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char* ostream_gets(ostream* s, char* buf, int count)
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{
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char c;
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int i = 0;
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assert(buf); /* xxxFIXME: should be an exception ? */
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if (!(s->flags & OSTREAM_READFLAG))
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return NULL;
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while (i < count-1) {
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[(id <Streaming>)s->stream_obj readByte: &c];
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if (c == -1)
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break;
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buf[i++] = c;
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if (c == '\n')
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break;
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}
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buf[i++] = 0;
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return i > 1 ? buf : NULL;
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}
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int
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ostream_write(ostream* s, const void* buf, int count)
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{
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assert(buf); /* xxxFIXME: should be an exception ? */
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if (s->flags & OSTREAM_WRITEFLAG)
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return [(id <Streaming>)s->stream_obj writeBytes: buf length: count];
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return OSTREAM_EOF;
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}
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void
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ostream_printf(ostream *s, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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ostream_vprintf(s, format, args);
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va_end(args);
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}
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void
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ostream_vprintf(ostream *s, const char *format, va_list argList)
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{
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id <String> str = [String stringWithCString: format];
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if (s->flags & OSTREAM_WRITEFLAG)
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[(id <Streaming>)s->stream_obj writeFormat: str arguments: argList];
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else
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_ostream_error("Tried to write to non-writable stream");
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}
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int
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ostream_scanf(ostream *s, const char *format, ...)
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{
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int ret;
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va_list args;
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va_start(args, format);
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ret = ostream_vscanf(s, format, args);
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va_end(args);
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return ret;
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}
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int
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ostream_vscanf(ostream *s, const char *format, va_list argList)
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{
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id <String> str = [String stringWithCString: format];
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if (s->flags & OSTREAM_READFLAG)
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return [(id <Streaming>)s->stream_obj readFormat: str
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arguments: argList];
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_ostream_error("Tried to read from non-readable stream");
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return OSTREAM_EOF;
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}
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static ostream *
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_ostream_new_stream_struct(int mode, char** cmode)
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{
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char* fmode;
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ostream* stream;
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OBJC_MALLOC(stream, ostream, 1);
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stream->flags = 0;
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switch (mode)
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{
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case OSTREAM_READONLY:
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fmode = "r";
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stream->flags |= OSTREAM_READFLAG;
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break;
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case OSTREAM_WRITEONLY:
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fmode = "w";
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stream->flags |= OSTREAM_WRITEFLAG;
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break;
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case OSTREAM_READWRITE:
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fmode = "w+";
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stream->flags |= OSTREAM_READFLAG;
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stream->flags |= OSTREAM_WRITEFLAG;
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break;
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case OSTREAM_APPEND:
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fmode = "w";
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stream->flags |= OSTREAM_WRITEFLAG;
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break;
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default:
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fmode = "r";
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break;
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}
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if (cmode)
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*cmode = fmode;
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return stream;
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}
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ostream *
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ostream_open_descriptor(int fd, int mode)
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{
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char* fmode;
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ostream* stream = _ostream_new_stream_struct(mode, &fmode);
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stream->stream_obj = [[StdioStream alloc] initWithFileDescriptor: fd
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fmode: fmode];
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/* FIXME: Just assuming we can seek FILE streams */
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stream->flags |= OSTREAM_CANSEEK;
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return stream;
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}
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ostream *
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ostream_open_memory(const char *addr, int size, int mode)
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{
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char* fmode;
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ostream* stream = _ostream_new_stream_struct(mode, &fmode);
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if (addr)
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{
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stream->stream_obj = [[MemoryStream alloc] _initOnMallocBuffer: addr
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size: size
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eofPosition: size
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prefix: 0
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position: 0];
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if (!stream->stream_obj)
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return NULL;
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/* xxxFIXME: Now way of telling MemoryStream that we own this buffer
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so just ad an extra retain so we never free the stream */
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[(id)stream->stream_obj retain];
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}
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else
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{
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stream->stream_obj = [[MemoryStream alloc] initWithCapacity: size
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prefix: 0];
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}
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if (mode == OSTREAM_APPEND)
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ostream_seek(stream, 0, OSTREAM_SEEK_FROM_END);
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stream->flags |= OSTREAM_CANSEEK;
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stream->flags |= OSTREAM_ISBUFFER;
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return stream;
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}
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ostream *
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ostream_map_file(const char *name, int mode)
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{
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char* fmode;
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String* str = [String stringWithCString: name];
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ostream* stream = _ostream_new_stream_struct(mode, &fmode);
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stream->stream_obj = [[StdioStream alloc] initWithFilename: str
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fmode: fmode];
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if (!stream->stream_obj)
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return NULL;
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/* xxxFIXME: Just assuming that we can seek: */
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stream->flags |= OSTREAM_CANSEEK;
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if (mode == OSTREAM_APPEND)
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ostream_seek(stream, 0, OSTREAM_SEEK_FROM_END);
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return stream;
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}
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/* Would like to use NSData for this, but it's to hard to pass the buffer
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and tell NSData not to free it */
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int
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ostream_save_to_file(ostream *s, const char *name)
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{
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StdioStream* output;
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if (!(s->flags & OSTREAM_ISBUFFER))
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{
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_ostream_error("Tried to save non-memory stream");
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return -1;
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}
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output = [[StdioStream alloc] initWithFilename:
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[NSString stringWithCString: name] fmode: "w"];
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if (!output)
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{
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_ostream_error("Unable to open save file");
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return -1;
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}
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[output writeBytes: [(id <MemoryStreaming>)s->stream_obj streamBuffer]
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length: [(id <MemoryStreaming>)s->stream_obj streamEofPosition]];
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[output release];
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return 0;
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}
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void
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ostream_get_memory_buffer(ostream *s, char **addr, int *len, int *maxlen)
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{
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if (!(s->flags & OSTREAM_ISBUFFER))
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{
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if (addr)
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*addr = 0;
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return;
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}
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if (addr)
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*addr = [(id <MemoryStreaming>)s->stream_obj streamBuffer];
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if (len)
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*len = [(id <MemoryStreaming>)s->stream_obj streamEofPosition];
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if (maxlen)
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*maxlen = [(id <MemoryStreaming>)s->stream_obj streamBufferCapacity];
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}
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void
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ostream_close_memory(ostream *s, int option)
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{
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if (s->flags & OSTREAM_ISBUFFER)
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{
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/* Here's the extra release that allows MemoryStream to dealloc itself */
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if (option == OSTREAM_FREEBUFFER)
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[(id)s->stream_obj release];
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}
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ostream_close(s);
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}
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void
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ostream_close(ostream *s)
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{
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[(id <Streaming>)s->stream_obj close];
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[(id)s->stream_obj release];
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s->stream_obj = 0;
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OBJC_FREE(s);
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}
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