123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/* $NetBSD: memfs.c,v 1.1 2011/03/06 18:22:13 phx Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2011 Frank Wille.
|
|
* All rights reserved.
|
|
*
|
|
* Written by Frank Wille for The NetBSD Project.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
|
|
#include <lib/libsa/stand.h>
|
|
|
|
#include "globals.h"
|
|
#include "memfs.h"
|
|
|
|
struct memhandle {
|
|
char *base;
|
|
off_t off;
|
|
};
|
|
|
|
int
|
|
mem_open(const char *path, struct open_file *f)
|
|
{
|
|
struct memhandle *mh;
|
|
|
|
mh = alloc(sizeof(struct memhandle));
|
|
if (mh == NULL)
|
|
return ENOMEM;
|
|
mh->base = (char *)read_hex(path);
|
|
mh->off = 0;
|
|
f->f_fsdata = mh;
|
|
return 0;
|
|
}
|
|
|
|
#ifndef LIBSA_NO_FS_CLOSE
|
|
int
|
|
mem_close(struct open_file *f)
|
|
{
|
|
|
|
dealloc(f->f_fsdata, sizeof(struct memhandle));
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
mem_read(struct open_file *f, void *buf, size_t size, size_t *resid)
|
|
{
|
|
struct memhandle *mh;
|
|
|
|
mh = f->f_fsdata;
|
|
memcpy(buf, mh->base + mh->off, size);
|
|
mh->off += size;
|
|
if (resid)
|
|
*resid = 0;
|
|
return 0;
|
|
}
|
|
|
|
#ifndef LIBSA_NO_FS_WRITE
|
|
int
|
|
mem_write(struct open_file *f, void *buf, size_t size, size_t *resid)
|
|
{
|
|
struct memhandle *mh;
|
|
|
|
mh = f->f_fsdata;
|
|
memcpy(mh->base + mh->off, buf, size);
|
|
mh->off += size;
|
|
if (resid)
|
|
*resid = 0;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifndef LIBSA_NO_FS_SEEK
|
|
off_t
|
|
mem_seek(struct open_file *f, off_t offset, int where)
|
|
{
|
|
struct memhandle *mh;
|
|
|
|
mh = f->f_fsdata;
|
|
switch (where) {
|
|
case SEEK_SET:
|
|
mh->off = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
mh->off += offset;
|
|
break;
|
|
default:
|
|
errno = EOFFSET;
|
|
return -1;
|
|
}
|
|
return mh->off;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
mem_stat(struct open_file *f, struct stat *sb)
|
|
{
|
|
|
|
return EIO;
|
|
}
|