openblt

a hobby OS from the late 90s
git clone http://frotz.net/git/openblt.git
Log | Files | Refs | LICENSE

blkdev.c (2380B)


      1 /* $Id: //depot/blt/srv/vfs/sandbox/blkdev.c#1 $
      2 **
      3 ** Copyright 1999 Sidney Cammeresi
      4 ** All rights reserved.
      5 **
      6 ** Redistribution and use in source and binary forms, with or without
      7 ** modification, are permitted provided that the following conditions
      8 ** are met:
      9 ** 1. Redistributions of source code must retain the above copyright
     10 **    notice, this list of conditions, and the following disclaimer.
     11 ** 2. Redistributions in binary form must reproduce the above copyright
     12 **    notice, this list of conditions, and the following disclaimer in the
     13 **    documentation and/or other materials provided with the distribution.
     14 ** 3. The name of the author may not be used to endorse or promote products
     15 **    derived from this software without specific prior written permission.
     16 **
     17 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19 ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20 ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22 ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26 ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 */
     28 
     29 #include <stdlib.h>
     30 #include <fcntl.h>
     31 #include <unistd.h>
     32 #include <sys/stat.h>
     33 #include <sys/types.h>
     34 #include "blkdev.h"
     35 
     36 int blk_open (const char *name, int flags, blkdev_t **retdev)
     37 {
     38 	int fd;
     39 	struct stat statbuf;
     40 
     41 	if (stat (name, &statbuf))
     42 	{
     43 		*retdev = NULL;
     44 		return -1;
     45 	}
     46 	if ((fd = open (name, O_RDONLY, 0)) < 0)
     47 	{
     48 		*retdev = NULL;
     49 		return -1;
     50 	}
     51 	*retdev = malloc (sizeof (blkdev_t));
     52 	(*retdev)->blksize = 512;
     53 	(*retdev)->devno = fd;
     54 	return 0;
     55 }
     56 
     57 int blk_close (blkdev_t *dev)
     58 {
     59 	close (dev->devno);
     60 	free (dev);
     61 	return 0;
     62 }
     63 
     64 int blk_read (blkdev_t *dev, void *buf, int block, int count)
     65 {
     66 	int i;
     67 
     68 	lseek (dev->devno, block * dev->blksize, SEEK_SET);
     69 	for (i = 0; i < count; i++)
     70 		read (dev->devno, buf + dev->blksize * i, dev->blksize);
     71 	return 0;
     72 }
     73 
     74 int blk_write (blkdev_t dev, const void *buf, int block, int count)
     75 {
     76 	return 0;
     77 }
     78