splitfs.c revision 199767f8919635c4928607450d9e0abb932109ce
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Copyright (c) 2002 Maxim Sobolev
199767f8919635c4928607450d9e0abb932109ceToomas Soome * All rights reserved.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Redistribution and use in source and binary forms, with or without
199767f8919635c4928607450d9e0abb932109ceToomas Soome * modification, are permitted provided that the following conditions
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 1. Redistributions of source code must retain the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
199767f8919635c4928607450d9e0abb932109ceToomas Soome * notice, this list of conditions and the following disclaimer in the
199767f8919635c4928607450d9e0abb932109ceToomas Soome * documentation and/or other materials provided with the distribution.
199767f8919635c4928607450d9e0abb932109ceToomas Soome * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
199767f8919635c4928607450d9e0abb932109ceToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
199767f8919635c4928607450d9e0abb932109ceToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
199767f8919635c4928607450d9e0abb932109ceToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
199767f8919635c4928607450d9e0abb932109ceToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
199767f8919635c4928607450d9e0abb932109ceToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
199767f8919635c4928607450d9e0abb932109ceToomas Soome * SUCH DAMAGE.
199767f8919635c4928607450d9e0abb932109ceToomas Soome off_t tot_pos; /* Offset from the beginning of the sequence */
199767f8919635c4928607450d9e0abb932109ceToomas Soome off_t file_pos; /* Offset from the beginning of the slice */
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int split_openfile(struct split_file *sf);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int splitfs_open(const char *path, struct open_file *f);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int splitfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic off_t splitfs_seek(struct open_file *f, off_t offset, int where);
199767f8919635c4928607450d9e0abb932109ceToomas Soomestatic int splitfs_stat(struct open_file *f, struct stat *sb);
199767f8919635c4928607450d9e0abb932109ceToomas Soome for (i = 0;; i++) {
199767f8919635c4928607450d9e0abb932109ceToomas Soome sf->curfd = open(sf->filesv[sf->curfile], O_RDONLY);
199767f8919635c4928607450d9e0abb932109ceToomas Soome printf("\nInsert disk labelled %s and press any key...",
199767f8919635c4928607450d9e0abb932109ceToomas Soomesplitfs_open(const char *fname, struct open_file *f)
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Have to be in "just read it" mode */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* If the name already ends in `.split', ignore it */
199767f8919635c4928607450d9e0abb932109ceToomas Soome if ((cp = strrchr(fname, '.')) && (!strcmp(cp, ".split")))
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Construct new name */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Try to open the configuration file */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Allocate a split_file structure, populate it from the config file */
199767f8919635c4928607450d9e0abb932109ceToomas Soome sf->filesv = realloc(sf->filesv, sizeof(*(sf->filesv)) * sf->filesc);
199767f8919635c4928607450d9e0abb932109ceToomas Soome sf->descsv = realloc(sf->descsv, sizeof(*(sf->descsv)) * sf->filesc);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Looks OK, we'll take it */
199767f8919635c4928607450d9e0abb932109ceToomas Soomesplitfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Error? */
199767f8919635c4928607450d9e0abb932109ceToomas Soome if (sf->curfile == (sf->filesc - 1)) /* Last slice */
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Close previous slice */
199767f8919635c4928607450d9e0abb932109ceToomas Soomesplitfs_seek(struct open_file *f, off_t offset, int where)
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome * Seek forward - implemented using splitfs_read(), because otherwise we'll be
199767f8919635c4928607450d9e0abb932109ceToomas Soome * unable to detect that we have crossed slice boundary and hence
199767f8919635c4928607450d9e0abb932109ceToomas Soome * unable to do a long seek crossing that boundary.
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome errno = splitfs_read(f, tmp, min(seek_by, SEEK_BUF), &resid);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Error or EOF */
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* Seek backward or seek past the boundary of the last slice */
199767f8919635c4928607450d9e0abb932109ceToomas Soome panic("splitfs_seek: can't seek past the beginning of the slice");
199767f8919635c4928607450d9e0abb932109ceToomas Soome return (-1);
199767f8919635c4928607450d9e0abb932109ceToomas Soomesplitfs_stat(struct open_file *f, struct stat *sb)
199767f8919635c4928607450d9e0abb932109ceToomas Soome struct split_file *sf = (struct split_file *)f->f_fsdata;
199767f8919635c4928607450d9e0abb932109ceToomas Soome /* stat as normal, but indicate that size is unknown */