pushpull.c

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    1 /*
    2  * JFFS2 -- Journalling Flash File System, Version 2.
    3  *
    4  * Copyright (C) 2001 Red Hat, Inc.
    5  *
    6  * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
    7  *
    8  * The original JFFS, from which the design for JFFS2 was derived,
    9  * was designed and implemented by Axis Communications AB.
   10  *
   11  * The contents of this file are subject to the Red Hat eCos Public
   12  * License Version 1.1 (the "Licence"); you may not use this file
   13  * except in compliance with the Licence.  You may obtain a copy of
   14  * the Licence at http://www.redhat.com/
   15  *
   16  * Software distributed under the Licence is distributed on an "AS IS"
   17  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
   18  * See the Licence for the specific language governing rights and
   19  * limitations under the Licence.
   20  *
   21  * The Original Code is JFFS2 - Journalling Flash File System, version 2
   22  *
   23  * Alternatively, the contents of this file may be used under the
   24  * terms of the GNU General Public License version 2 (the "GPL"), in
   25  * which case the provisions of the GPL are applicable instead of the
   26  * above.  If you wish to allow the use of your version of this file
   27  * only under the terms of the GPL and not to allow others to use your
   28  * version of this file under the RHEPL, indicate your decision by
   29  * deleting the provisions above and replace them with the notice and
   30  * other provisions required by the GPL.  If you do not delete the
   31  * provisions above, a recipient may use your version of this file
   32  * under either the RHEPL or the GPL.
   33  *
   34  * $Id: pushpull.c,v 1.7 2001/09/23 10:04:15 rmk Exp $
   35  *
   36  */
   37 
   38 #include <linux/string.h>
   39 #include "pushpull.h"
   40 #include <linux/errno.h>
   41 
   42 void init_pushpull(struct pushpull *pp, char *buf, unsigned buflen, unsigned ofs, unsigned reserve)
   43 {
   44         pp->buf = buf;
   45         pp->buflen = buflen;
   46         pp->ofs = ofs;
   47         pp->reserve = reserve;
   48 }
   49      
   50 
   51 int pushbit(struct pushpull *pp, int bit, int use_reserved)
   52 {
   53         if (pp->ofs >= pp->buflen - (use_reserved?0:pp->reserve)) {
   54                 return -ENOSPC;
   55         }
   56 
   57         if (bit) {
   58                 pp->buf[pp->ofs >> 3] |= (1<<(7-(pp->ofs &7)));
   59         }
   60         else {
   61                 pp->buf[pp->ofs >> 3] &= ~(1<<(7-(pp->ofs &7)));
   62         }
   63         pp->ofs++;
   64 
   65         return 0;
   66 }
   67 
   68 int pushedbits(struct pushpull *pp)
   69 {
   70         return pp->ofs;
   71 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/jffs2/pushpull.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/jffs2/pushpull.c