158 lines
3 KiB
C
158 lines
3 KiB
C
/***************************************************************************
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stream_direct.c
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The direct stream management routines
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(c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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***************************************************************************/
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#define __STREAM_IMPL_C
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#include "gb_common.h"
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#include "gb_error.h"
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#include "gbx_value.h"
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#include "gb_limit.h"
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include "gbx_stream.h"
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#define FD (stream->direct.fd)
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static int stream_open(STREAM *stream, const char *path, int mode)
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{
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int fd;
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struct stat info;
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int fmode;
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if (mode & ST_CREATE)
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fmode = O_CREAT | O_TRUNC;
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else if (mode & ST_APPEND)
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fmode = O_APPEND | O_CREAT;
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else
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fmode = 0;
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switch (mode & ST_MODE)
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{
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case ST_READ: fmode |= O_RDONLY; break;
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case ST_WRITE: fmode |= O_WRONLY; break;
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case ST_READ_WRITE: fmode |= O_RDWR; break;
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default: fmode |= O_RDONLY;
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}
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fd = open(path, fmode, 0666);
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if (fd < 0)
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return TRUE;
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if (fstat(fd, &info) < 0)
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return TRUE;
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if (S_ISDIR(info.st_mode))
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{
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errno = EISDIR;
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return TRUE;
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}
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stream->direct.size = info.st_size;
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FD = fd;
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return FALSE;
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}
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static int stream_close(STREAM *stream)
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{
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if (close(FD) < 0)
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return TRUE;
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FD = -1;
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return FALSE;
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}
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static int stream_read(STREAM *stream, char *buffer, long len)
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{
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return STREAM_read_direct(FD, buffer, len);
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}
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static int stream_getchar(STREAM *stream, char *buffer)
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{
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return read(FD, buffer, 1) <= 0;
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}
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static int stream_write(STREAM *stream, char *buffer, long len)
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{
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return STREAM_write_direct(FD, buffer, len);
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}
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static int stream_seek(STREAM *stream, long long pos, int whence)
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{
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return (lseek(FD, pos, whence) < 0);
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}
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static int stream_tell(STREAM *stream, long long *pos)
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{
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*pos = lseek(FD, 0, SEEK_CUR);
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return (*pos < 0);
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}
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static int stream_flush(STREAM *stream)
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{
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return FALSE;
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}
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/*static int stream_eof(STREAM *stream)
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{
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int ilen;
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if (STREAM_get_readable(FD, &ilen))
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return TRUE;
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return (ilen == 0);
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}*/
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#define stream_eof NULL
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static int stream_lof(STREAM *stream, long long *len)
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{
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*len = stream->direct.size;
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return FALSE;
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}
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static int stream_handle(STREAM *stream)
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{
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return FD;
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}
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DECLARE_STREAM(STREAM_direct);
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