GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/fdisk/disk.c Lines: 0 60 0.0 %
Date: 2017-11-13 Branches: 0 36 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: disk.c,v 1.55 2016/03/09 12:55:18 krw Exp $	*/
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/*
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 * Copyright (c) 1997 Tobias Weingartner
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/dkio.h>
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#include <sys/stat.h>
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#include <sys/disklabel.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <util.h>
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#include "disk.h"
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#include "misc.h"
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struct disk disk;
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struct disklabel dl;
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void
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DISK_open(int rw)
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{
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	struct stat st;
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	u_int64_t sz, spc;
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	disk.fd = opendev(disk.name, rw ? O_RDWR : O_RDONLY, OPENDEV_PART,
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	    NULL);
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	if (disk.fd == -1)
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		err(1, "%s", disk.name);
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	if (fstat(disk.fd, &st) == -1)
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		err(1, "%s", disk.name);
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	if (!S_ISCHR(st.st_mode))
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		errx(1, "%s is not a character device", disk.name);
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	/* Get label geometry. */
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	if (ioctl(disk.fd, DIOCGPDINFO, &dl) == -1) {
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		warn("DIOCGPDINFO");
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	} else {
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		unit_types[SECTORS].conversion = dl.d_secsize;
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		if (disk.size == 0) {
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			/* -l or -c/-h/-s not used. Use disklabel info. */
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			disk.cylinders = dl.d_ncylinders;
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			disk.heads = dl.d_ntracks;
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			disk.sectors = dl.d_nsectors;
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			/* MBR handles only first UINT32_MAX sectors. */
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			spc = (u_int64_t)disk.heads * disk.sectors;
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			sz = DL_GETDSIZE(&dl);
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			if (sz > UINT32_MAX) {
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				disk.cylinders = UINT32_MAX / spc;
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				disk.size = disk.cylinders * spc;
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			} else
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				disk.size = sz;
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		}
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	}
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	if (disk.size == 0 || disk.cylinders == 0 || disk.heads == 0 ||
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	    disk.sectors == 0 || unit_types[SECTORS].conversion == 0)
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		errx(1, "Can't get disk geometry, please use [-chs] or [-l]"
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		    "to specify.");
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}
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/*
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 * Print the disk geometry information. Take an optional modifier
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 * to indicate the units that should be used for display.
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 */
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int
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DISK_printgeometry(char *units)
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{
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	const int secsize = unit_types[SECTORS].conversion;
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	double size;
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	int i;
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	i = unit_lookup(units);
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	size = ((double)disk.size * secsize) / unit_types[i].conversion;
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	printf("Disk: %s\t", disk.name);
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	if (disk.size) {
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		printf("geometry: %d/%d/%d [%.0f ", disk.cylinders,
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		    disk.heads, disk.sectors, size);
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		if (i == SECTORS && secsize != sizeof(struct dos_mbr))
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			printf("%d-byte ", secsize);
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		printf("%s]\n", unit_types[i].lname);
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	} else
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		printf("geometry: <none>\n");
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	return (0);
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}
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/*
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 * Read the sector at 'where' from the file descriptor 'fd' into newly
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 * calloc'd memory. Return a pointer to the memory if it contains the
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 * requested data, or NULL if it does not.
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 *
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 * The caller must free() the memory it gets.
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 */
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char *
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DISK_readsector(off_t where)
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{
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	int secsize;
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	char *secbuf;
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	ssize_t len;
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	off_t off;
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	secsize = dl.d_secsize;
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	where *= secsize;
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	off = lseek(disk.fd, where, SEEK_SET);
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	if (off != where)
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		return (NULL);
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	secbuf = calloc(1, secsize);
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	if (secbuf == NULL)
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		return (NULL);
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	len = read(disk.fd, secbuf, secsize);
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	if (len == -1 || len != secsize) {
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		free(secbuf);
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		return (NULL);
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	}
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	return (secbuf);
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}
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/*
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 * Write the sector-sized 'secbuf' to the sector 'where' on the file
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 * descriptor 'fd'. Return 0 if the write works. Return -1 and set
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 * errno if the write fails.
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 */
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int
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DISK_writesector(char *secbuf, off_t where)
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{
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	int secsize;
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	ssize_t len;
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	off_t off;
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	len = -1;
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	secsize = dl.d_secsize;
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	where *= secsize;
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	off = lseek(disk.fd, where, SEEK_SET);
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	if (off == where)
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		len = write(disk.fd, secbuf, secsize);
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	if (len == -1 || len != secsize) {
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		/* short read or write */
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		errno = EIO;
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		return (-1);
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	}
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	return (0);
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}