1/* $NetBSD: stg.c,v 1.1 2011/03/06 13:55:12 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 38struct memhandle { 39 char *base; 40 off_t off; 41}; 42 43int 44mem_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 58int 59mem_close(struct open_file *f) 60{ 61 62 dealloc(f->f_fsdata, sizeof(struct memhandle)); 63 return 0; 64} 65#endif 66 67int 68mem_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 81int 82mem_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 96off_t 97mem_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 117int 118mem_stat(struct open_file *f, struct stat *sb) 119{ 120 121 return EIO; 122} 123