File: [cvs.NetBSD.org] / src / sbin / fdisk / fdisk.c (download)
Revision 1.14, Tue Jul 29 08:31:31 1997 UTC (26 years, 8 months ago) by phil
Branch: MAIN
Changes since 1.13: +56 -9
lines
Add code for a -s flag where the output is a series of VAL=xyz lines
so /bin/sh can "eval `fdisk -s`" and get variables defined with the
fdisk information.
|
/* $NetBSD: fdisk.c,v 1.14 1997/07/29 08:31:31 phil Exp $ */
/*
* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#ifndef lint
static char rcsid[] = "$NetBSD: fdisk.c,v 1.14 1997/07/29 08:31:31 phil Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define LBUF 100
static char lbuf[LBUF];
/*
* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
* Copyright (c) 1989 Robert. V. Baron
* Created.
*/
char *disk = "/dev/rwd0d";
struct disklabel disklabel; /* disk parameters */
int cylinders, sectors, heads, cylindersectors, disksectors;
struct mboot {
unsigned char padding[2]; /* force the longs to be long alligned */
unsigned char bootinst[DOSPARTOFF];
struct dos_partition parts[4];
unsigned short int signature;
};
struct mboot mboot;
#define ACTIVE 0x80
#define BOOT_MAGIC 0xAA55
int dos_cylinders;
int dos_heads;
int dos_sectors;
int dos_cylindersectors;
#define DOSSECT(s,c) (((s) & 0x3f) | (((c) >> 2) & 0xc0))
#define DOSCYL(c) ((c) & 0xff)
int partition = -1;
int a_flag; /* set active partition */
int i_flag; /* replace partition data */
int u_flag; /* update partition data */
int s_flag; /* Output data as shell defines */
unsigned char bootcode[] = {
0x33, 0xc0, 0xfa, 0x8e, 0xd0, 0xbc, 0x00, 0x7c, 0x8e, 0xc0, 0x8e, 0xd8, 0xfb, 0x8b, 0xf4, 0xbf,
0x00, 0x06, 0xb9, 0x00, 0x02, 0xfc, 0xf3, 0xa4, 0xea, 0x1d, 0x06, 0x00, 0x00, 0xb0, 0x04, 0xbe,
0xbe, 0x07, 0x80, 0x3c, 0x80, 0x74, 0x0c, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x75, 0xf4, 0xbe, 0xbd,
0x06, 0xeb, 0x43, 0x8b, 0xfe, 0x8b, 0x14, 0x8b, 0x4c, 0x02, 0x83, 0xc6, 0x10, 0xfe, 0xc8, 0x74,
0x0a, 0x80, 0x3c, 0x80, 0x75, 0xf4, 0xbe, 0xbd, 0x06, 0xeb, 0x2b, 0xbd, 0x05, 0x00, 0xbb, 0x00,
0x7c, 0xb8, 0x01, 0x02, 0xcd, 0x13, 0x73, 0x0c, 0x33, 0xc0, 0xcd, 0x13, 0x4d, 0x75, 0xef, 0xbe,
0x9e, 0x06, 0xeb, 0x12, 0x81, 0x3e, 0xfe, 0x7d, 0x55, 0xaa, 0x75, 0x07, 0x8b, 0xf7, 0xea, 0x00,
0x7c, 0x00, 0x00, 0xbe, 0x85, 0x06, 0x2e, 0xac, 0x0a, 0xc0, 0x74, 0x06, 0xb4, 0x0e, 0xcd, 0x10,
0xeb, 0xf4, 0xfb, 0xeb, 0xfe,
'M', 'i', 's', 's', 'i', 'n', 'g', ' ',
'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0,
'E', 'r', 'r', 'o', 'r', ' ', 'l', 'o', 'a', 'd', 'i', 'n', 'g', ' ',
'o', 'p', 'e', 'r', 'a', 't', 'i', 'n', 'g', ' ', 's', 'y', 's', 't', 'e', 'm', 0,
'I', 'n', 'v', 'a', 'l', 'i', 'd', ' ',
'p', 'a', 'r', 't', 'i', 't', 'i', 'o', 'n', ' ', 't', 'a', 'b', 'l', 'e', 0,
'A', 'u', 't', 'h', 'o', 'r', ' ', '-', ' ',
'S', 'i', 'e', 'g', 'm', 'a', 'r', ' ', 'S', 'c', 'h', 'm', 'i', 'd', 't', 0,0,0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
struct part_type {
int type;
char *name;
} part_types[] = {
{0x00, "unused"},
{0x01, "Primary DOS with 12 bit FAT"},
{0x02, "XENIX / filesystem"},
{0x03, "XENIX /usr filesystem"},
{0x04, "Primary DOS with 16 bit FAT <32M"},
{0x05, "Extended DOS"},
{0x06, "Primary 'big' DOS, 16-bit FAT (> 32MB)"},
{0x07, "OS/2 HPFS or NTFS or QNX2 or Advanced UNIX"},
{0x08, "AIX filesystem"},
{0x09, "AIX boot partition or Coherent"},
{0x0A, "OS/2 Boot Manager or Coherent swap or OPUS"},
{0x0E, "DOS (16-bit FAT), CHS-mapped"},
{0x0F, "Ext. partition, CHS-mapped"},
{0x10, "OPUS"},
{0x11, "OS/2 BM: hidden DOS 12-bit FAT"},
{0x12, "Compaq diagnostics"},
{0x14, "OS/2 BM: hidden DOS 16-bit FAT <32M"},
{0x16, "OS/2 BM: hidden DOS 16-bit FAT >=32M"},
{0x17, "OS/2 BM: hidden IFS"},
{0x18, "AST Windows swapfile"},
{0x24, "NEC DOS"},
{0x3C, "PartitionMagic recovery"},
{0x40, "VENIX 286"},
{0x41, "Linux/MINIX (sharing disk with DRDOS)"},
{0x42, "SFS or Linux swap (sharing disk with DRDOS)"},
{0x43, "Linux native (sharing disk with DRDOS)"},
{0x50, "DM (disk manager)"},
{0x51, "DM6 Aux1 (or Novell)"},
{0x52, "CP/M or Microport SysV/AT"},
{0x53, "DM6 Aux3"},
{0x54, "DM6"},
{0x55, "EZ-Drive (disk manager)"},
{0x56, "Golden Bow (disk manager)"},
{0x5C, "Priam Edisk (disk manager)"},
{0x61, "SpeedStor"},
{0x63, "GNU HURD or Mach or Sys V/386 (such as ISC UNIX)"},
{0x64, "Novell Netware 2.xx"},
{0x65, "Novell Netware 3.xx"},
{0x70, "DiskSecure Multi-Boot"},
{0x75, "PC/IX"},
{0x77, "QNX4.x"},
{0x78, "QNX4.x 2nd part"},
{0x79, "QNX4.x 3rd part"},
{0x80, "MINIX until 1.4a"},
{0x81, "MINIX since 1.4b, early Linux, Mitac dmgr"},
{0x82, "Linux swap"},
{0x83, "Linux native"},
{0x84, "OS/2 hidden C: drive"},
{0x85, "Linux extended"},
{0x86, "NTFS volume set??"},
{0x87, "NTFS volume set??"},
{0x93, "Amoeba filesystem"},
{0x94, "Amoeba bad block table"},
{0xA0, "IBM Thinkpad hibernation"},
{0xA5, "NetBSD or FreeBSD or 386BSD"},
{0xA6, "OpenBSD"},
{0xA7, "NeXTSTEP 486"},
{0xB7, "BSDI BSD/386 filesystem"},
{0xB8, "BSDI BSD/386 swap"},
{0xC1, "DRDOS/sec (FAT-12)"},
{0xC4, "DRDOS/sec (FAT-16, < 32M)"},
{0xC6, "DRDOS/sec (FAT-16, >= 32M)"},
{0xC7, "Syrinx"},
{0xDB, "CP/M or Concurrent CP/M or Concurrent DOS or CTOS"},
{0xE1, "DOS access or SpeedStor 12-bit FAT extended partition"},
{0xE3, "DOS R/O or SpeedStor"},
{0xE4, "SpeedStor 16-bit FAT extended partition < 1024 cyl."},
{0xF1, "SpeedStor"},
{0xF2, "DOS 3.3+ Secondary"},
{0xF4, "SpeedStor large partition"},
{0xFE, "SpeedStor >1024 cyl. or LANstep"},
{0xFF, "Xenix Bad Block Table"},
};
void usage __P((void));
void print_s0 __P((int));
void print_part __P((int));
void init_sector0 __P((int));
void intuit_translated_geometry __P((void));
int try_heads __P((quad_t, quad_t, quad_t, quad_t, quad_t, quad_t, quad_t,
quad_t));
int try_sectors __P((quad_t, quad_t, quad_t, quad_t, quad_t));
void change_part __P((int));
void print_params __P((void));
void change_active __P((int));
void get_params_to_use __P((void));
void dos __P((int, unsigned char *, unsigned char *, unsigned char *));
int open_disk __P((int));
int read_disk __P((int, void *));
int write_disk __P((int, void *));
int get_params __P((void));
int read_s0 __P((void));
int write_s0 __P((void));
int yesno __P((char *));
void decimal __P((char *, int *));
int type_match __P((const void *, const void *));
char *get_type __P((int));
int
main(argc, argv)
int argc;
char *argv[];
{
int ch;
int part;
a_flag = i_flag = u_flag = s_flag = 0;
while ((ch = getopt(argc, argv, "0123aius")) != -1)
switch (ch) {
case '0':
partition = 0;
break;
case '1':
partition = 1;
break;
case '2':
partition = 2;
break;
case '3':
partition = 3;
break;
case 'a':
a_flag = 1;
break;
case 'i':
i_flag = 1;
case 'u':
u_flag = 1;
break;
case 's':
s_flag = 1;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (s_flag && (a_flag || i_flag || u_flag ))
usage();
if (argc > 0)
disk = argv[0];
if (open_disk(a_flag || i_flag || u_flag) < 0)
exit(1);
if (read_s0())
init_sector0(1);
intuit_translated_geometry();
if (!s_flag)
printf("******* Working on device %s *******\n", disk);
if (u_flag)
get_params_to_use();
else
print_params();
if (!s_flag) {
printf("Warning: BIOS sector numbering starts with sector 1\n");
printf("Information from DOS bootblock is:\n");
}
if (partition == -1) {
for (part = 0; part < NDOSPART; part++)
change_part(part);
} else
change_part(partition);
if (u_flag || a_flag)
change_active(partition);
if (u_flag || a_flag) {
printf("\nWe haven't changed the partition table yet. ");
printf("This is your last chance.\n");
print_s0(-1);
if (yesno("Should we write new partition table?"))
write_s0();
}
exit(0);
}
void
usage()
{
(void)fprintf(stderr, "usage: fdisk [-aiu] [-0|-1|-2|-3] [device]\n");
(void)fprintf(stderr, "usage: fdisk -s [-0|-1|-2|-3] [device]\n");
exit(1);
}
void
print_s0(which)
int which;
{
int part;
print_params();
printf("Information from DOS bootblock is:\n");
if (which == -1) {
for (part = 0; part < NDOSPART; part++)
printf("%d: ", part), print_part(part);
} else
print_part(which);
}
static struct dos_partition mtpart = { 0 };
static inline unsigned short
getshort(p)
void *p;
{
unsigned char *cp = p;
return cp[0] | (cp[1] << 8);
}
static inline void
putshort(p, l)
void *p;
unsigned short l;
{
unsigned char *cp = p;
*cp++ = l;
*cp++ = l >> 8;
}
static inline unsigned long
getlong(p)
void *p;
{
unsigned char *cp = p;
return cp[0] | (cp[1] << 8) | (cp[2] << 16) | (cp[3] << 24);
}
static inline void
putlong(p, l)
void *p;
unsigned long l;
{
unsigned char *cp = p;
*cp++ = l;
*cp++ = l >> 8;
*cp++ = l >> 16;
*cp++ = l >> 24;
}
void
print_part(part)
int part;
{
struct dos_partition *partp;
int empty;
partp = &mboot.parts[part];
empty = !memcmp(partp, &mtpart, sizeof(struct dos_partition));
if (s_flag) {
if (empty) {
printf("PART%dSIZE=0\n", part);
return;
}
printf("PART%dID=%d\n", part, partp->dp_typ);
printf("PART%dSIZE=%d\n", part, getlong(&partp->dp_size));
printf("PART%dSTART=%d\n", part, getlong(&partp->dp_start));
printf("PART%dFLAG=%x\n", part, partp->dp_flag);
printf("PART%dBCYL=%d\n", part, DPCYL(partp->dp_scyl,
partp->dp_ssect));
printf("PART%dBHEAD=%d\n", part, partp->dp_shd);
printf("PART%dBSEC=%d\n", part, DPSECT(partp->dp_ssect));
printf("PART%dECYL=%d\n", part, DPCYL(partp->dp_ecyl,
partp->dp_esect));
printf("PART%dEHEAD=%d\n", part, partp->dp_ehd);
printf("PART%dESEC=%d\n", part, DPSECT(partp->dp_esect));
return;
}
/* Not s_flag. */
if (empty) {
printf("<UNUSED>\n");
return;
}
printf("sysid %d (%s)\n", partp->dp_typ, get_type(partp->dp_typ));
printf(" start %d, size %d (%d MB), flag %x\n",
getlong(&partp->dp_start), getlong(&partp->dp_size),
getlong(&partp->dp_size) * 512 / (1024 * 1024), partp->dp_flag);
printf("\tbeg: cylinder %4d, head %3d, sector %2d\n",
DPCYL(partp->dp_scyl, partp->dp_ssect),
partp->dp_shd, DPSECT(partp->dp_ssect));
printf("\tend: cylinder %4d, head %3d, sector %2d\n",
DPCYL(partp->dp_ecyl, partp->dp_esect),
partp->dp_ehd, DPSECT(partp->dp_esect));
}
void
init_sector0(start)
int start;
{
struct dos_partition *partp;
memcpy(mboot.bootinst, bootcode, sizeof(bootcode));
putshort(&mboot.signature, BOOT_MAGIC);
partp = &mboot.parts[3];
partp->dp_typ = DOSPTYP_386BSD;
partp->dp_flag = ACTIVE;
putlong(&partp->dp_start, start);
putlong(&partp->dp_size, disksectors - start);
dos(getlong(&partp->dp_start),
&partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect);
dos(getlong(&partp->dp_start) + getlong(&partp->dp_size) - 1,
&partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect);
}
/* Prerequisite: the disklabel parameters and master boot record must
* have been read (i.e. dos_* and mboot are meaningful).
* Specification: modifies dos_cylinders, dos_heads, dos_sectors, and
* dos_cylindersectors to be consistent with what the
* partition table is using, if we can find a geometry
* which is consistent with all partition table entries.
* We may get the number of cylinders slightly wrong (in
* the conservative direction). The idea is to be able
* to create a NetBSD partition on a disk we don't know
* the translated geometry of.
* This whole routine should be replaced with a kernel interface to get
* the BIOS geometry (which in turn requires modifications to the i386
* boot loader to pass in the BIOS geometry for each disk). */
void
intuit_translated_geometry()
{
int cylinders = -1, heads = -1, sectors = -1, i, j;
int c1, h1, s1, c2, h2, s2;
long a1, a2;
quad_t num, denom;
/* Try to deduce the number of heads from two different mappings. */
for (i = 0; i < NDOSPART * 2; i++) {
if (get_mapping(i, &c1, &h1, &s1, &a1) < 0)
continue;
for (j = 0; j < 8; j++) {
if (get_mapping(j, &c2, &h2, &s2, &a2) < 0)
continue;
num = (quad_t)h1*(a2-s2) - h2*(a1-s1);
denom = (quad_t)c2*(a1-s1) - c1*(a2-s2);
if (denom != 0 && num % denom == 0) {
heads = num / denom;
break;
}
}
if (heads != -1)
break;
}
if (heads == -1)
return;
/* Now figure out the number of sectors from a single mapping. */
for (i = 0; i < NDOSPART * 2; i++) {
if (get_mapping(i, &c1, &h1, &s1, &a1) < 0)
continue;
num = a1 - s1;
denom = c1 * heads + h1;
if (denom != 0 && num % denom == 0) {
sectors = num / denom;
break;
}
}
if (sectors == -1)
return;
/* Estimate the number of cylinders. */
cylinders = dos_cylinders * dos_cylindersectors / heads / sectors;
/* Now verify consistency with each of the partition table entries.
* Be willing to shove cylinders up a little bit to make things work,
* but translation mismatches are fatal. */
for (i = 0; i < NDOSPART * 2; i++) {
if (get_mapping(i, &c1, &h1, &s1, &a1) < 0)
continue;
if (sectors * (c1 * heads + h1) + s1 != a1)
return;
if (c1 >= cylinders)
cylinders = c1 + 1;
}
/* Everything checks out. Reset the geometry to use for further
* calculations. */
dos_cylinders = cylinders;
dos_heads = heads;
dos_sectors = sectors;
dos_cylindersectors = heads * sectors;
}
/* For the purposes of intuit_translated_geometry(), treat the partition
* table as a list of eight mapping between (cylinder, head, sector)
* triplets and absolute sectors. Get the relevant geometry triplet and
* absolute sectors for a given entry, or return -1 if it isn't present.
* Note: for simplicity, the returned sector is 0-based. */
int
get_mapping(i, cylinder, head, sector, absolute)
int i, *cylinder, *head, *sector;
long *absolute;
{
struct dos_partition *part = &mboot.parts[i / 2];
if (part->dp_typ == 0)
return -1;
if (i % 2 == 0) {
*cylinder = DPCYL(part->dp_scyl, part->dp_ssect);
*head = part->dp_shd;
*sector = DPSECT(part->dp_ssect) - 1;
*absolute = getlong(&part->dp_start);
} else {
*cylinder = DPCYL(part->dp_ecyl, part->dp_esect);
*head = part->dp_ehd;
*sector = DPSECT(part->dp_esect) - 1;
*absolute = getlong(&part->dp_start)
+ getlong(&part->dp_size) - 1;
}
return 0;
}
void
change_part(part)
int part;
{
struct dos_partition *partp;
partp = &mboot.parts[part];
if (!s_flag)
printf("The data for partition %d is:\n", part);
print_part(part);
if (!u_flag || !yesno("Do you want to change it?"))
return;
if (i_flag) {
memset(partp, 0, sizeof(*partp));
if (part == 3) {
init_sector0(1);
printf("\nThe static data for the DOS partition 3 has been reinitialized to:\n");
print_part(part);
}
}
do {
{
int sysid, start, size;
sysid = partp->dp_typ,
start = getlong(&partp->dp_start),
size = getlong(&partp->dp_size);
decimal("sysid", &sysid);
decimal("start", &start);
decimal("size", &size);
partp->dp_typ = sysid;
putlong(&partp->dp_start, start);
putlong(&partp->dp_size, size);
}
if (yesno("Explicitly specify beg/end address?")) {
int tsector, tcylinder, thead;
tcylinder = DPCYL(partp->dp_scyl, partp->dp_ssect);
thead = partp->dp_shd;
tsector = DPSECT(partp->dp_ssect);
decimal("beginning cylinder", &tcylinder);
decimal("beginning head", &thead);
decimal("beginning sector", &tsector);
partp->dp_scyl = DOSCYL(tcylinder);
partp->dp_shd = thead;
partp->dp_ssect = DOSSECT(tsector, tcylinder);
tcylinder = DPCYL(partp->dp_ecyl, partp->dp_esect);
thead = partp->dp_ehd;
tsector = DPSECT(partp->dp_esect);
decimal("ending cylinder", &tcylinder);
decimal("ending head", &thead);
decimal("ending sector", &tsector);
partp->dp_ecyl = DOSCYL(tcylinder);
partp->dp_ehd = thead;
partp->dp_esect = DOSSECT(tsector, tcylinder);
} else {
dos(getlong(&partp->dp_start),
&partp->dp_scyl, &partp->dp_shd, &partp->dp_ssect);
dos(getlong(&partp->dp_start)
+ getlong(&partp->dp_size) - 1,
&partp->dp_ecyl, &partp->dp_ehd, &partp->dp_esect);
}
print_part(part);
} while (!yesno("Is this entry okay?"));
}
void
print_params()
{
if (s_flag) {
printf ("DLCYL=%d\nDLHEAD=%d\nDLSEC=%d\n",
cylinders, heads, sectors);
printf ("BCYL=%d\nBHEAD=%d\nBSEC=%d\n",
dos_cylinders, dos_heads, dos_sectors);
return;
}
/* Not s_flag */
printf("parameters extracted from in-core disklabel are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d sectors/cylinder)\n\n",
cylinders, heads, sectors, cylindersectors);
if (dos_sectors > 63 || dos_cylinders > 1023 || dos_heads > 255)
printf("Figures below won't work with BIOS for partitions not in cylinder 1\n");
printf("parameters to be used for BIOS calculations are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d sectors/cylinder)\n\n",
dos_cylinders, dos_heads, dos_sectors, dos_cylindersectors);
}
void
change_active(which)
int which;
{
struct dos_partition *partp;
int part;
int active = 3;
partp = &mboot.parts[0];
if (a_flag && which != -1)
active = which;
else {
for (part = 0; part < NDOSPART; part++)
if (partp[part].dp_flag & ACTIVE)
active = part;
}
if (yesno("Do you want to change the active partition?")) {
do {
decimal("active partition", &active);
} while (!yesno("Are you happy with this choice?"));
}
for (part = 0; part < NDOSPART; part++)
partp[part].dp_flag &= ~ACTIVE;
partp[active].dp_flag |= ACTIVE;
}
void
get_params_to_use()
{
print_params();
if (yesno("Do you want to change our idea of what BIOS thinks?")) {
do {
decimal("BIOS's idea of #cylinders", &dos_cylinders);
decimal("BIOS's idea of #heads", &dos_heads);
decimal("BIOS's idea of #sectors", &dos_sectors);
dos_cylindersectors = dos_heads * dos_sectors;
print_params();
} while (!yesno("Are you happy with this choice?"));
}
}
/***********************************************\
* Change real numbers into strange dos numbers *
\***********************************************/
void
dos(sector, cylinderp, headp, sectorp)
int sector;
unsigned char *cylinderp, *headp, *sectorp;
{
int cylinder, head;
cylinder = sector / dos_cylindersectors;
sector -= cylinder * dos_cylindersectors;
head = sector / dos_sectors;
sector -= head * dos_sectors;
*cylinderp = DOSCYL(cylinder);
*headp = head;
*sectorp = DOSSECT(sector + 1, cylinder);
}
int fd;
int
open_disk(u_flag)
int u_flag;
{
struct stat st;
if ((fd = open(disk, u_flag ? O_RDWR : O_RDONLY)) == -1) {
warn("%s", disk);
return (-1);
}
if (fstat(fd, &st) == -1) {
close(fd);
warn("%s", disk);
return (-1);
}
if (!S_ISCHR(st.st_mode) && !S_ISREG(st.st_mode)) {
close(fd);
warnx("%s is not a character device or regular file", disk);
return (-1);
}
if (get_params() == -1) {
close(fd);
return (-1);
}
return (0);
}
int
read_disk(sector, buf)
int sector;
void *buf;
{
if (lseek(fd, (off_t)(sector * 512), 0) == -1)
return (-1);
return (read(fd, buf, 512));
}
int
write_disk(sector, buf)
int sector;
void *buf;
{
if (lseek(fd, (off_t)(sector * 512), 0) == -1)
return (-1);
return (write(fd, buf, 512));
}
int
get_params()
{
if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
warn("DIOCGDINFO");
return (-1);
}
dos_cylinders = cylinders = disklabel.d_ncylinders;
dos_heads = heads = disklabel.d_ntracks;
dos_sectors = sectors = disklabel.d_nsectors;
dos_cylindersectors = cylindersectors = heads * sectors;
disksectors = cylinders * heads * sectors;
return (0);
}
int
read_s0()
{
if (read_disk(0, mboot.bootinst) == -1) {
warn("can't read fdisk partition table");
return (-1);
}
if (getshort(&mboot.signature) != BOOT_MAGIC) {
warnx("invalid fdisk partition table found");
/* So should we initialize things? */
return (-1);
}
return (0);
}
int
write_s0()
{
int flag;
/*
* write enable label sector before write (if necessary),
* disable after writing.
* needed if the disklabel protected area also protects
* sector 0. (e.g. empty disk)
*/
flag = 1;
if (ioctl(fd, DIOCWLABEL, &flag) < 0)
warn("DIOCWLABEL");
if (write_disk(0, mboot.bootinst) == -1) {
warn("can't write fdisk partition table");
return -1;
}
flag = 0;
if (ioctl(fd, DIOCWLABEL, &flag) < 0)
warn("DIOCWLABEL");
}
int
yesno(str)
char *str;
{
int ch, first;
printf("%s [n] ", str);
first = ch = getchar();
while (ch != '\n' && ch != EOF)
ch = getchar();
return (first == 'y' || first == 'Y');
}
void
decimal(str, num)
char *str;
int *num;
{
int acc = 0;
char *cp;
for (;; printf("%s is not a valid decimal number.\n", lbuf)) {
printf("Supply a decimal value for \"%s\" [%d] ", str, *num);
fgets(lbuf, LBUF, stdin);
lbuf[strlen(lbuf)-1] = '\0';
cp = lbuf;
cp += strspn(cp, " \t");
if (*cp == '\0')
return;
if (!isdigit(*cp))
continue;
acc = strtol(lbuf, &cp, 10);
cp += strspn(cp, " \t");
if (*cp != '\0')
continue;
*num = acc;
return;
}
}
int
type_match(key, item)
const void *key, *item;
{
const int *typep = key;
const struct part_type *ptr = item;
if (*typep < ptr->type)
return (-1);
if (*typep > ptr->type)
return (1);
return (0);
}
char *
get_type(type)
int type;
{
struct part_type *ptr;
ptr = bsearch(&type, part_types,
sizeof(part_types) / sizeof(struct part_type),
sizeof(struct part_type), type_match);
if (ptr == 0)
return ("unknown");
else
return (ptr->name);
}
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