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freebsd/sbin/fdisk/fdisk.c
Robert Nordier 12d910e9bb Add a -b option as a simple way to rewrite the mbr code 
(eg. replacing a boot manager with a standard mbr)
1999-01-22 11:54:17 +00:00

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/*
* 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 const char rcsid[] =
"$Id: fdisk.c,v 1.27 1998/11/26 12:24:35 joerg Exp $";
#endif /* not lint */
#include <sys/disklabel.h>
#include <sys/stat.h>
#include <ctype.h>
#include <fcntl.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int iotest;
#define LBUF 100
static char lbuf[LBUF];
/*
*
* Ported to 386bsd by Julian Elischer Thu Oct 15 20:26:46 PDT 1992
*
* 14-Dec-89 Robert Baron (rvb) at Carnegie-Mellon University
* Copyright (c) 1989 Robert. V. Baron
* Created.
*/
#define Decimal(str, ans, tmp) if (decimal(str, &tmp, ans)) ans = tmp
#define Hex(str, ans, tmp) if (hex(str, &tmp, ans)) ans = tmp
#define String(str, ans, len) {char *z = ans; char **dflt = &z; if (string(str, dflt)) strncpy(ans, *dflt, len); }
#define RoundCyl(x) ((((x) + cylsecs - 1) / cylsecs) * cylsecs)
#define MAX_SEC_SIZE 2048 /* maximum section size that is supported */
#define MIN_SEC_SIZE 512 /* the sector size to start sensing at */
int secsize = 0; /* the sensed sector size */
const char *disk;
const char *disks[] =
{
"/dev/rwd0", "/dev/rda0", "/dev/rod0", 0
};
struct disklabel disklabel; /* disk parameters */
int cyls, sectors, heads, cylsecs, disksecs;
struct mboot
{
unsigned char padding[2]; /* force the longs to be long aligned */
unsigned char bootinst[DOSPARTOFF];
struct dos_partition parts[4];
unsigned short int signature;
/* room to read in MBRs that are bigger then DEV_BSIZE */
unsigned char large_sector_overflow[MAX_SEC_SIZE-MIN_SEC_SIZE];
};
struct mboot mboot;
#define ACTIVE 0x80
#define BOOT_MAGIC 0xAA55
int dos_cyls;
int dos_heads;
int dos_sectors;
int dos_cylsecs;
#define DOSSECT(s,c) ((s & 0x3f) | ((c >> 2) & 0xc0))
#define DOSCYL(c) (c & 0xff)
static int partition = -1;
#define MAX_ARGS 10
static int current_line_number;
static int geom_processed = 0;
static int part_processed = 0;
static int active_processed = 0;
typedef struct cmd {
char cmd;
int n_args;
struct arg {
char argtype;
int arg_val;
} args[MAX_ARGS];
} CMD;
static int a_flag = 0; /* set active partition */
static int b_flag = 0; /* replace boot code */
static int i_flag = 0; /* replace partition data */
static int u_flag = 0; /* update partition data */
static int t_flag = 0; /* test only, if f_flag is given */
static char *f_flag = NULL; /* Read config info from file */
static int v_flag = 0; /* Be verbose */
static 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
{
unsigned char 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 (<= 32MB)"}
,{0x05, "Extended DOS"}
,{0x06, "Primary 'big' DOS (> 32MB)"}
,{0x07, "OS/2 HPFS, NTFS, QNX or Advanced UNIX"}
,{0x08, "AIX filesystem"}
,{0x09, "AIX boot partition or Coherent"}
,{0x0A, "OS/2 Boot Manager or OPUS"}
,{0x0B, "DOS or Windows 95 with 32 bit FAT"}
,{0x0C, "DOS or Windows 95 with 32 bit FAT, LBA"}
,{0x0E, "Primary 'big' DOS (> 32MB, LBA)"}
,{0x0F, "Extended DOS, LBA"}
,{0x10, "OPUS"}
,{0x40, "VENIX 286"}
,{0x50, "DM"}
,{0x51, "DM"}
,{0x52, "CP/M or Microport SysV/AT"}
,{0x56, "GB"}
,{0x61, "Speed"}
,{0x63, "ISC UNIX, other System V/386, GNU HURD or Mach"}
,{0x64, "Novell Netware 2.xx"}
,{0x65, "Novell Netware 3.xx"}
,{0x75, "PCIX"}
,{0x80, "Minix 1.1 ... 1.4a"}
,{0x81, "Minix 1.4b ... 1.5.10"}
,{0x82, "Linux swap or Solaris x86"}
,{0x83, "Linux filesystem"}
,{0x93, "Amoeba filesystem"}
,{0x94, "Amoeba bad block table"}
,{0x9F, "BSD/OS"}
,{0xA5, "FreeBSD/NetBSD/386BSD"}
,{0xA6, "OpenBSD"}
,{0xA7, "NEXTSTEP"}
,{0xA9, "NetBSD"}
,{0xB7, "BSDI BSD/386 filesystem"}
,{0xB8, "BSDI BSD/386 swap"}
,{0xDB, "Concurrent CPM or C.DOS or CTOS"}
,{0xE1, "Speed"}
,{0xE3, "Speed"}
,{0xE4, "Speed"}
,{0xF1, "Speed"}
,{0xF2, "DOS 3.3+ Secondary"}
,{0xF4, "Speed"}
,{0xFF, "BBT (Bad Blocks Table)"}
};
static void print_s0(int which);
static void print_part(int i);
static void init_sector0(unsigned long start);
static void init_boot(void);
static void change_part(int i);
static void print_params();
static void change_active(int which);
static void change_code();
static void get_params_to_use();
static void dos(int sec, int size, unsigned char *c, unsigned char *s,
unsigned char *h);
static int open_disk(int u_flag);
static ssize_t read_disk(off_t sector, void *buf);
static ssize_t write_disk(off_t sector, void *buf);
static int get_params();
static int read_s0();
static int write_s0();
static int ok(char *str);
static int decimal(char *str, int *num, int deflt);
static char *get_type(int type);
static int read_config(char *config_file);
static void reset_boot(void);
static void usage(void);
#if 0
static int hex(char *str, int *num, int deflt);
static int string(char *str, char **ans);
#endif
int
main(int argc, char *argv[])
{
int i;
for ( argv++ ; --argc ; argv++ ) { register char *token = *argv;
if (*token++ != '-' || !*token)
break;
else { register int flag;
for ( ; (flag = *token++) ; ) {
switch (flag) {
case '1':
partition = 1;
break;
case '2':
partition = 2;
break;
case '3':
partition = 3;
break;
case '4':
partition = 4;
break;
case 'a':
a_flag = 1;
break;
case 'b':
b_flag = 1;
break;
case 'f':
if (*token)
{
f_flag = token;
token = "";
}
else
{
if (argc == 1)
usage();
--argc;
f_flag = *++argv;
}
/*
* u_flag is needed, because we're
* writing to the disk.
*/
u_flag = 1;
break;
case 'i':
i_flag = 1;
case 'u':
u_flag = 1;
break;
case 't':
t_flag = 1;
case 'v':
v_flag = 1;
break;
default:
usage();
}
}
}
}
if (argc > 0)
{
static char realname[12];
if(strncmp(argv[0], "/dev", 4) == 0)
disk = argv[0];
else
{
snprintf(realname, 12, "/dev/r%s", argv[0]);
disk = realname;
}
if (open_disk(u_flag) < 0)
err(1, "cannot open disk %s", disk);
}
else
{
int i, rv = 0;
for(i = 0; disks[i]; i++)
{
disk = disks[i];
rv = open_disk(u_flag);
if(rv != -2) break;
}
if(rv < 0)
err(1, "cannot open any disk");
}
printf("******* Working on device %s *******\n",disk);
if (f_flag)
{
if (read_s0() || i_flag)
{
reset_boot();
}
if (!read_config(f_flag))
{
exit(1);
}
if (v_flag)
{
print_s0(-1);
}
if (!t_flag)
{
write_s0();
}
}
else
{
if(u_flag)
{
get_params_to_use();
}
else
{
print_params();
}
if (read_s0())
init_sector0(1);
printf("Media sector size is %d\n", secsize);
printf("Warning: BIOS sector numbering starts with sector 1\n");
printf("Information from DOS bootblock is:\n");
if (partition == -1)
for (i = 1; i <= NDOSPART; i++)
change_part(i);
else
change_part(partition);
if (u_flag || a_flag)
change_active(partition);
if (b_flag)
change_code();
if (u_flag || a_flag || b_flag) {
if (!t_flag)
{
printf("\nWe haven't changed the partition table yet. ");
printf("This is your last chance.\n");
}
print_s0(-1);
if (!t_flag)
{
if (ok("Should we write new partition table?"))
write_s0();
}
else
{
printf("\n-t flag specified -- partition table not written.\n");
}
}
}
exit(0);
}
static void
usage()
{
fprintf(stderr,
"usage: fdisk {-a|-b|-i|-u} [-f configfile [-t] [-v]] [-{1,2,3,4}] [disk]\n");
exit(1);
}
static void
print_s0(int which)
{
int i;
print_params();
printf("Information from DOS bootblock is:\n");
if (which == -1)
for (i = 1; i <= NDOSPART; i++)
printf("%d: ", i), print_part(i);
else
print_part(which);
}
static struct dos_partition mtpart = { 0 };
static void
print_part(int i)
{
struct dos_partition *partp;
u_int64_t part_mb;
partp = ((struct dos_partition *) &mboot.parts) + i - 1;
if (!bcmp(partp, &mtpart, sizeof (struct dos_partition))) {
printf("<UNUSED>\n");
return;
}
/*
* Be careful not to overflow.
*/
part_mb = partp->dp_size;
part_mb *= secsize;
part_mb /= (1024 * 1024);
printf("sysid %d,(%s)\n", partp->dp_typ, get_type(partp->dp_typ));
printf(" start %lu, size %lu (%qd Meg), flag %x%s\n",
(u_long)partp->dp_start,
(u_long)partp->dp_size,
part_mb,
partp->dp_flag,
partp->dp_flag == ACTIVE ? " (active)" : "");
printf("\tbeg: cyl %d/ sector %d/ head %d;\n\tend: cyl %d/ sector %d/ head %d\n"
,DPCYL(partp->dp_scyl, partp->dp_ssect)
,DPSECT(partp->dp_ssect)
,partp->dp_shd
,DPCYL(partp->dp_ecyl, partp->dp_esect)
,DPSECT(partp->dp_esect)
,partp->dp_ehd);
}
static void
init_boot(void)
{
memcpy(mboot.bootinst, bootcode, sizeof(bootcode));
mboot.signature = BOOT_MAGIC;
}
static void
init_sector0(unsigned long start)
{
struct dos_partition *partp = (struct dos_partition *) (&mboot.parts[3]);
unsigned long size = disksecs - start;
init_boot();
partp->dp_typ = DOSPTYP_386BSD;
partp->dp_flag = ACTIVE;
partp->dp_start = start;
partp->dp_size = size;
dos(partp->dp_start, partp->dp_size,
&partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd);
dos(partp->dp_start + partp->dp_size - 1, partp->dp_size,
&partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd);
}
static void
change_part(int i)
{
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts) + i - 1;
printf("The data for partition %d is:\n", i);
print_part(i);
if (u_flag && ok("Do you want to change it?")) {
int tmp;
if (i_flag) {
bzero((char *)partp, sizeof (struct dos_partition));
if (i == 4) {
init_sector0(1);
printf("\nThe static data for the DOS partition 4 has been reinitialized to:\n");
print_part(i);
}
}
do {
Decimal("sysid (165=FreeBSD)", partp->dp_typ, tmp);
Decimal("start", partp->dp_start, tmp);
Decimal("size", partp->dp_size, tmp);
if (ok("Explicitly specify beg/end address ?"))
{
int tsec,tcyl,thd;
tcyl = DPCYL(partp->dp_scyl,partp->dp_ssect);
thd = partp->dp_shd;
tsec = DPSECT(partp->dp_ssect);
Decimal("beginning cylinder", tcyl, tmp);
Decimal("beginning head", thd, tmp);
Decimal("beginning sector", tsec, tmp);
partp->dp_scyl = DOSCYL(tcyl);
partp->dp_ssect = DOSSECT(tsec,tcyl);
partp->dp_shd = thd;
tcyl = DPCYL(partp->dp_ecyl,partp->dp_esect);
thd = partp->dp_ehd;
tsec = DPSECT(partp->dp_esect);
Decimal("ending cylinder", tcyl, tmp);
Decimal("ending head", thd, tmp);
Decimal("ending sector", tsec, tmp);
partp->dp_ecyl = DOSCYL(tcyl);
partp->dp_esect = DOSSECT(tsec,tcyl);
partp->dp_ehd = thd;
} else {
dos(partp->dp_start, partp->dp_size,
&partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd);
dos(partp->dp_start + partp->dp_size - 1, partp->dp_size,
&partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd);
}
print_part(i);
} while (!ok("Are we happy with this entry?"));
}
}
static void
print_params()
{
printf("parameters extracted from in-core disklabel are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
,cyls,heads,sectors,cylsecs);
if((dos_sectors > 63) || (dos_cyls > 1023) || (dos_heads > 255))
printf("Figures below won't work with BIOS for partitions not in cyl 1\n");
printf("parameters to be used for BIOS calculations are:\n");
printf("cylinders=%d heads=%d sectors/track=%d (%d blks/cyl)\n\n"
,dos_cyls,dos_heads,dos_sectors,dos_cylsecs);
}
static void
change_active(int which)
{
int i;
int active = 4, tmp;
struct dos_partition *partp = ((struct dos_partition *) &mboot.parts);
if (a_flag && which != -1)
active = which;
if (!ok("Do you want to change the active partition?"))
return;
setactive:
active = 4;
do {
Decimal("active partition", active, tmp);
if (active < 1 || 4 < active) {
printf("Active partition number must be in range 1-4."
" Try again.\n");
goto setactive;
}
} while (!ok("Are you happy with this choice"));
for (i = 0; i < NDOSPART; i++)
partp[i].dp_flag = 0;
if (active > 0 && active <= NDOSPART)
partp[active-1].dp_flag = ACTIVE;
}
static void
change_code()
{
if (ok("Do you want to change the boot code?"))
init_boot();
}
void
get_params_to_use()
{
int tmp;
print_params();
if (ok("Do you want to change our idea of what BIOS thinks ?"))
{
do
{
Decimal("BIOS's idea of #cylinders", dos_cyls, tmp);
Decimal("BIOS's idea of #heads", dos_heads, tmp);
Decimal("BIOS's idea of #sectors", dos_sectors, tmp);
dos_cylsecs = dos_heads * dos_sectors;
print_params();
}
while(!ok("Are you happy with this choice"));
}
}
/***********************************************\
* Change real numbers into strange dos numbers *
\***********************************************/
static void
dos(sec, size, c, s, h)
int sec, size;
unsigned char *c, *s, *h;
{
int cy;
int hd;
if (sec == 0 && size == 0) {
*s = *c = *h = 0;
return;
}
cy = sec / ( dos_cylsecs );
sec = sec - cy * ( dos_cylsecs );
hd = sec / dos_sectors;
sec = (sec - hd * dos_sectors) + 1;
*h = hd;
*c = cy & 0xff;
*s = (sec & 0x3f) | ( (cy & 0x300) >> 2);
}
int fd;
/* Getting device status */
static int
open_disk(int u_flag)
{
struct stat st;
if (stat(disk, &st) == -1) {
warnx("can't get file status of %s", disk);
return -1;
}
if ( !(st.st_mode & S_IFCHR) )
warnx("device %s is not character special", disk);
if ((fd = open(disk,
a_flag || b_flag || u_flag ? O_RDWR : O_RDONLY)) == -1) {
if(errno == ENXIO)
return -2;
warnx("can't open device %s", disk);
return -1;
}
if (get_params(0) == -1) {
warnx("can't get disk parameters on %s", disk);
return -1;
}
return fd;
}
static ssize_t
read_disk(off_t sector, void *buf)
{
lseek(fd,(sector * 512), 0);
if( secsize == 0 )
for( secsize = MIN_SEC_SIZE; secsize <= MAX_SEC_SIZE; secsize *= 2 )
{
/* try the read */
int size = read(fd, buf, secsize);
if( size == secsize )
/* it worked so return */
return secsize;
}
else
return read( fd, buf, secsize );
/* we failed to read at any of the sizes */
return -1;
}
static ssize_t
write_disk(off_t sector, void *buf)
{
lseek(fd,(sector * 512), 0);
/* write out in the size that the read_disk found worked */
return write(fd, buf, secsize);
}
static int
get_params()
{
if (ioctl(fd, DIOCGDINFO, &disklabel) == -1) {
warnx("can't get disk parameters on %s; supplying dummy ones", disk);
dos_cyls = cyls = 1;
dos_heads = heads = 1;
dos_sectors = sectors = 1;
dos_cylsecs = cylsecs = heads * sectors;
disksecs = cyls * heads * sectors;
return disksecs;
}
dos_cyls = cyls = disklabel.d_ncylinders;
dos_heads = heads = disklabel.d_ntracks;
dos_sectors = sectors = disklabel.d_nsectors;
dos_cylsecs = cylsecs = heads * sectors;
disksecs = cyls * heads * sectors;
return (disksecs);
}
static int
read_s0()
{
if (read_disk(0, (char *) mboot.bootinst) == -1) {
warnx("can't read fdisk partition table");
return -1;
}
if (mboot.signature != BOOT_MAGIC) {
warnx("invalid fdisk partition table found");
/* So should we initialize things */
return -1;
}
return 0;
}
static int
write_s0()
{
int flag;
if (iotest) {
print_s0(-1);
return 0;
}
/*
* 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;
#ifdef NOT_NOW
if (ioctl(fd, DIOCWLABEL, &flag) < 0)
warn("ioctl DIOCWLABEL");
#endif
if (write_disk(0, (char *) mboot.bootinst) == -1) {
warnx("can't write fdisk partition table");
return -1;
flag = 0;
#ifdef NOT_NOW
(void) ioctl(fd, DIOCWLABEL, &flag);
#endif
}
return(0);
}
static int
ok(str)
char *str;
{
printf("%s [n] ", str);
fgets(lbuf, LBUF, stdin);
lbuf[strlen(lbuf)-1] = 0;
if (*lbuf &&
(!strcmp(lbuf, "yes") || !strcmp(lbuf, "YES") ||
!strcmp(lbuf, "y") || !strcmp(lbuf, "Y")))
return 1;
else
return 0;
}
static int
decimal(char *str, int *num, int deflt)
{
int acc = 0, c;
char *cp;
while (1) {
printf("Supply a decimal value for \"%s\" [%d] ", str, deflt);
fgets(lbuf, LBUF, stdin);
lbuf[strlen(lbuf)-1] = 0;
if (!*lbuf)
return 0;
cp = lbuf;
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c)
return 0;
while ((c = *cp++)) {
if (c <= '9' && c >= '0')
acc = acc * 10 + c - '0';
else
break;
}
if (c == ' ' || c == '\t')
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c) {
*num = acc;
return 1;
} else
printf("%s is an invalid decimal number. Try again.\n",
lbuf);
}
}
#if 0
static int
hex(char *str, int *num, int deflt)
{
int acc = 0, c;
char *cp;
while (1) {
printf("Supply a hex value for \"%s\" [%x] ", str, deflt);
fgets(lbuf, LBUF, stdin);
lbuf[strlen(lbuf)-1] = 0;
if (!*lbuf)
return 0;
cp = lbuf;
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c)
return 0;
while ((c = *cp++)) {
if (c <= '9' && c >= '0')
acc = (acc << 4) + c - '0';
else if (c <= 'f' && c >= 'a')
acc = (acc << 4) + c - 'a' + 10;
else if (c <= 'F' && c >= 'A')
acc = (acc << 4) + c - 'A' + 10;
else
break;
}
if (c == ' ' || c == '\t')
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (!c) {
*num = acc;
return 1;
} else
printf("%s is an invalid hex number. Try again.\n",
lbuf);
}
}
static int
string(char *str, char **ans)
{
int c;
char *cp = lbuf;
while (1) {
printf("Supply a string value for \"%s\" [%s] ", str, *ans);
fgets(lbuf, LBUF, stdin);
lbuf[strlen(lbuf)-1] = 0;
if (!*lbuf)
return 0;
while ((c = *cp) && (c == ' ' || c == '\t')) cp++;
if (c == '"') {
c = *++cp;
*ans = cp;
while ((c = *cp) && c != '"') cp++;
} else {
*ans = cp;
while ((c = *cp) && c != ' ' && c != '\t') cp++;
}
if (c)
*cp = 0;
return 1;
}
}
#endif
static char *
get_type(int type)
{
int numentries = (sizeof(part_types)/sizeof(struct part_type));
int counter = 0;
struct part_type *ptr = part_types;
while(counter < numentries)
{
if(ptr->type == type)
{
return(ptr->name);
}
ptr++;
counter++;
}
return("unknown");
}
static void
parse_config_line(line, command)
char *line;
CMD *command;
{
char *cp, *end;
cp = line;
while (1) /* dirty trick used to insure one exit point for this
function */
{
memset(command, 0, sizeof(*command));
while (isspace(*cp)) ++cp;
if (*cp == '\0' || *cp == '#')
{
break;
}
command->cmd = *cp++;
/*
* Parse args
*/
while (1)
{
while (isspace(*cp)) ++cp;
if (*cp == '#')
{
break; /* found comment */
}
if (isalpha(*cp))
{
command->args[command->n_args].argtype = *cp++;
}
if (!isdigit(*cp))
{
break; /* assume end of line */
}
end = NULL;
command->args[command->n_args].arg_val = strtol(cp, &end, 0);
if (cp == end)
{
break; /* couldn't parse number */
}
cp = end;
command->n_args++;
}
break;
}
}
static int
process_geometry(command)
CMD *command;
{
int status = 1, i;
while (1)
{
geom_processed = 1;
if (part_processed)
{
warnx(
"ERROR line %d: the geometry specification line must occur before\n\
all partition specifications",
current_line_number);
status = 0;
break;
}
if (command->n_args != 3)
{
warnx("ERROR line %d: incorrect number of geometry args",
current_line_number);
status = 0;
break;
}
dos_cyls = -1;
dos_heads = -1;
dos_sectors = -1;
for (i = 0; i < 3; ++i)
{
switch (command->args[i].argtype)
{
case 'c':
dos_cyls = command->args[i].arg_val;
break;
case 'h':
dos_heads = command->args[i].arg_val;
break;
case 's':
dos_sectors = command->args[i].arg_val;
break;
default:
warnx(
"ERROR line %d: unknown geometry arg type: '%c' (0x%02x)",
current_line_number, command->args[i].argtype,
command->args[i].argtype);
status = 0;
break;
}
}
if (status == 0)
{
break;
}
dos_cylsecs = dos_heads * dos_sectors;
/*
* Do sanity checks on parameter values
*/
if (dos_cyls < 0)
{
warnx("ERROR line %d: number of cylinders not specified",
current_line_number);
status = 0;
}
if (dos_cyls == 0 || dos_cyls > 1024)
{
warnx(
"WARNING line %d: number of cylinders (%d) may be out-of-range\n\
(must be within 1-1024 for normal BIOS operation, unless the entire disk\n\
is dedicated to FreeBSD)",
current_line_number, dos_cyls);
}
if (dos_heads < 0)
{
warnx("ERROR line %d: number of heads not specified",
current_line_number);
status = 0;
}
else if (dos_heads < 1 || dos_heads > 256)
{
warnx("ERROR line %d: number of heads must be within (1-256)",
current_line_number);
status = 0;
}
if (dos_sectors < 0)
{
warnx("ERROR line %d: number of sectors not specified",
current_line_number);
status = 0;
}
else if (dos_sectors < 1 || dos_sectors > 63)
{
warnx("ERROR line %d: number of sectors must be within (1-63)",
current_line_number);
status = 0;
}
break;
}
return (status);
}
static int
process_partition(command)
CMD *command;
{
int status = 0, partition;
unsigned long chunks, adj_size, max_end;
struct dos_partition *partp;
while (1)
{
part_processed = 1;
if (command->n_args != 4)
{
warnx("ERROR line %d: incorrect number of partition args",
current_line_number);
break;
}
partition = command->args[0].arg_val;
if (partition < 1 || partition > 4)
{
warnx("ERROR line %d: invalid partition number %d",
current_line_number, partition);
break;
}
partp = ((struct dos_partition *) &mboot.parts) + partition - 1;
bzero((char *)partp, sizeof (struct dos_partition));
partp->dp_typ = command->args[1].arg_val;
partp->dp_start = command->args[2].arg_val;
partp->dp_size = command->args[3].arg_val;
max_end = partp->dp_start + partp->dp_size;
if (partp->dp_typ == 0)
{
/*
* Get out, the partition is marked as unused.
*/
/*
* Insure that it's unused.
*/
bzero((char *)partp, sizeof (struct dos_partition));
status = 1;
break;
}
/*
* Adjust start upwards, if necessary, to fall on an head boundary.
*/
if (partp->dp_start % dos_sectors != 0)
{
adj_size =
(partp->dp_start / dos_sectors + 1) * dos_sectors;
if (adj_size > max_end)
{
/*
* Can't go past end of partition
*/
warnx(
"ERROR line %d: unable to adjust start of partition %d to fall on\n\
a cylinder boundary",
current_line_number, partition);
break;
}
warnx(
"WARNING: adjusting start offset of partition '%d' from %lu\n\
to %lu, to round to an head boundary",
partition, (u_long)partp->dp_start, adj_size);
partp->dp_start = adj_size;
}
/*
* Adjust size downwards, if necessary, to fall on a cylinder
* boundary.
*/
chunks =
((partp->dp_start + partp->dp_size) / dos_cylsecs) * dos_cylsecs;
adj_size = chunks - partp->dp_start;
if (adj_size != partp->dp_size)
{
warnx(
"WARNING: adjusting size of partition '%d' from %lu to %lu,\n\
to round to a cylinder boundary",
partition, (u_long)partp->dp_size, adj_size);
if (chunks > 0)
{
partp->dp_size = adj_size;
}
else
{
partp->dp_size = 0;
}
}
if (partp->dp_size < 1)
{
warnx("ERROR line %d: size for partition '%d' is zero",
current_line_number, partition);
break;
}
dos(partp->dp_start, partp->dp_size,
&partp->dp_scyl, &partp->dp_ssect, &partp->dp_shd);
dos(partp->dp_start+partp->dp_size - 1, partp->dp_size,
&partp->dp_ecyl, &partp->dp_esect, &partp->dp_ehd);
status = 1;
break;
}
return (status);
}
static int
process_active(command)
CMD *command;
{
int status = 0, partition, i;
struct dos_partition *partp;
while (1)
{
active_processed = 1;
if (command->n_args != 1)
{
warnx("ERROR line %d: incorrect number of active args",
current_line_number);
status = 0;
break;
}
partition = command->args[0].arg_val;
if (partition < 1 || partition > 4)
{
warnx("ERROR line %d: invalid partition number %d",
current_line_number, partition);
break;
}
/*
* Reset active partition
*/
partp = ((struct dos_partition *) &mboot.parts);
for (i = 0; i < NDOSPART; i++)
partp[i].dp_flag = 0;
partp[partition-1].dp_flag = ACTIVE;
status = 1;
break;
}
return (status);
}
static int
process_line(line)
char *line;
{
CMD command;
int status = 1;
while (1)
{
parse_config_line(line, &command);
switch (command.cmd)
{
case 0:
/*
* Comment or blank line
*/
break;
case 'g':
/*
* Set geometry
*/
status = process_geometry(&command);
break;
case 'p':
status = process_partition(&command);
break;
case 'a':
status = process_active(&command);
break;
default:
status = 0;
break;
}
break;
}
return (status);
}
static int
read_config(config_file)
char *config_file;
{
FILE *fp = NULL;
int status = 1;
char buf[1010];
while (1) /* dirty trick used to insure one exit point for this
function */
{
if (strcmp(config_file, "-") != 0)
{
/*
* We're not reading from stdin
*/
if ((fp = fopen(config_file, "r")) == NULL)
{
status = 0;
break;
}
}
else
{
fp = stdin;
}
current_line_number = 0;
while (!feof(fp))
{
if (fgets(buf, sizeof(buf), fp) == NULL)
{
break;
}
++current_line_number;
status = process_line(buf);
if (status == 0)
{
break;
}
}
break;
}
if (fp)
{
/*
* It doesn't matter if we're reading from stdin, as we've reached EOF
*/
fclose(fp);
}
return (status);
}
static void
reset_boot(void)
{
int i;
struct dos_partition *partp;
init_boot();
for (i = 0; i < 4; ++i)
{
partp = ((struct dos_partition *) &mboot.parts) + i;
bzero((char *)partp, sizeof (struct dos_partition));
}
}
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