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      1 /* $NetBSD: memfs.c,v 1.1 2011/03/06 18:22:13 phx Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2011 Frank Wille.
      5  * All rights reserved.
      6  *
      7  * Written by Frank Wille for The NetBSD Project.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/param.h>
     32 
     33 #include <lib/libsa/stand.h>
     34 
     35 #include "globals.h"
     36 #include "memfs.h"
     37 
     38 struct memhandle {
     39 	char *base;
     40 	off_t off;
     41 };
     42 
     43 int
     44 mem_open(const char *path, struct open_file *f)
     45 {
     46 	struct memhandle *mh;
     47 
     48 	mh = alloc(sizeof(struct memhandle));
     49 	if (mh == NULL)
     50 		return ENOMEM;
     51 	mh->base = (char *)read_hex(path);
     52 	mh->off = 0;
     53 	f->f_fsdata = mh;
     54 	return 0;
     55 }
     56 
     57 #ifndef LIBSA_NO_FS_CLOSE
     58 int
     59 mem_close(struct open_file *f)
     60 {
     61 
     62 	dealloc(f->f_fsdata, sizeof(struct memhandle));
     63 	return 0;
     64 }
     65 #endif
     66 
     67 int
     68 mem_read(struct open_file *f, void *buf, size_t size, size_t *resid)
     69 {
     70 	struct memhandle *mh;
     71 
     72 	mh = f->f_fsdata;
     73 	memcpy(buf, mh->base + mh->off, size);
     74 	mh->off += size;
     75 	if (resid)
     76 		*resid = 0;
     77 	return 0;
     78 }
     79 
     80 #ifndef LIBSA_NO_FS_WRITE
     81 int
     82 mem_write(struct open_file *f, void *buf, size_t size, size_t *resid)
     83 {
     84 	struct memhandle *mh;
     85 
     86 	mh = f->f_fsdata;
     87 	memcpy(mh->base + mh->off, buf, size);
     88 	mh->off += size;
     89 	if (resid)
     90 		*resid = 0;
     91 	return 0;
     92 }
     93 #endif
     94 
     95 #ifndef LIBSA_NO_FS_SEEK
     96 off_t
     97 mem_seek(struct open_file *f, off_t offset, int where)
     98 {
     99 	struct memhandle *mh;
    100 
    101 	mh = f->f_fsdata;
    102 	switch (where) {
    103 	case SEEK_SET:
    104 		mh->off = offset;
    105 		break;
    106 	case SEEK_CUR:
    107 		mh->off += offset;
    108 		break;
    109 	default:
    110 		errno = EOFFSET;
    111 		return -1;
    112 	}
    113 	return mh->off;
    114 }
    115 #endif
    116 
    117 int
    118 mem_stat(struct open_file *f, struct stat *sb)
    119 {
    120 
    121 	return EIO;
    122 }
    123