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minix3/commands/fdisk/fdisk.c

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/* fdisk - partition a hard disk Author: Jakob Schripsema */
/* Run this with:
*
* fdisk [-hheads] [-ssectors] [device]
*
* e.g.,
*
* fdisk (to get the default)
* fdisk -h4 -s17 /dev/hd0 (MINIX default)
* fdisk -h4 -s17 c: (DOS default)
* fdisk -h6 -s25 /dev/hd5 (second drive, probably RLL)
* fdisk junkfile (to experiment safely)
*
* The device is opened in read-only mode if the file permissions do not
* permit read-write mode, so it is convenient to use a login account with
* only read permission to look at the partition table safely.
*
* Compile with:
*
* cc -i -o fdisk fdisk.c (MINIX)
* cl -DDOS fdisk.c (DOS with MS C compiler)
*
* This was modified extensively by Bruce Evans 28 Dec 89.
* The new version has not been tried with DOS. The open modes are suspect
* (everyone should convert to use fcntl.h).
*
* Changed 18 Dec 92 by Kees J. Bot: Bootstrap code and geometry from device.
*
* modified 01 March 95 by asw: updated list of known partition types. Also
* changed display format slightly to allow for partition type names of
* up to 9 chars (previous format allowed for 7, but there were already
* some 8 char names in the list).
*/
#include <sys/types.h>
#include <machine/partition.h>
#include <minix/partition.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#ifdef DOS
#include <dos.h>
#define DEFAULT_DEV "c:"
#define LOAD_OPEN_MODE 0x8000
#define SAVE_CREAT_MODE 0644
#else
#define DEFAULT_DEV "/dev/hd0"
#define LOAD_OPEN_MODE 0
#define SAVE_CREAT_MODE 0644
#define UNIX /* for MINIX */
#endif
/* Constants */
#define DEFAULT_NHEAD 4 /* # heads */
#define DEFAULT_NSEC 17 /* sectors / track */
#define SECSIZE 512 /* sector size */
#define OK 0
#define ERR 1
#define CYL_MASK 0xc0 /* mask to extract cyl bits from sec field */
#define CYL_SHIFT 2 /* shift to extract cyl bits from sec field */
#define SEC_MASK 0x3f /* mask to extract sec bits from sec field */
/* Globals */
char rawsecbuf[SECSIZE + sizeof(long)];
char *secbuf;
int badbases;
int badsizes;
int badorders;
char *dev_name;
int nhead;
int nsec;
int ncyl = 1024;
int readonly;
int override= 0;
int main(int argc, char *argv []);
void getgeom(void);
void getboot(char *buffer);
void putboot(char *buffer);
void load_from_file(void);
void save_to_file(void);
void dpl_partitions(int rawflag);
int chk_table(void);
void sec_to_hst(long logsec, unsigned char *hd, unsigned char *sec,
unsigned char *cyl);
void mark_partition(struct part_entry *pe);
void change_partition(struct part_entry *entry);
char get_a_char(void);
void print_menu(void);
void adj_base(struct part_entry *pe);
void adj_size(struct part_entry *pe);
struct part_entry *ask_partition(void);
void footnotes(void);
int get_an_int(char *prompt, int *intptr);
void list_part_types(void);
void mark_npartition(struct part_entry *pe);
int mygets(char *buf, int length);
char *systype(int type);
void toggle_active(struct part_entry *pe);
void usage(void);
/* One featureful master bootstrap. */
char bootstrap[] = {
0353,0001,0000,0061,0300,0216,0330,0216,0300,0372,0216,0320,0274,0000,0174,0373,
0275,0276,0007,0211,0346,0126,0277,0000,0006,0271,0000,0001,0374,0363,0245,0352,
0044,0006,0000,0000,0264,0002,0315,0026,0250,0010,0164,0033,0350,0071,0001,0174,
0007,0060,0344,0315,0026,0242,0205,0007,0054,0060,0074,0012,0163,0363,0120,0350,
0046,0001,0205,0007,0130,0353,0012,0240,0002,0006,0204,0300,0165,0003,0351,0147,
0000,0230,0262,0005,0366,0362,0262,0200,0000,0302,0210,0340,0120,0350,0234,0000,
0163,0003,0351,0147,0000,0130,0054,0001,0175,0003,0351,0141,0000,0276,0276,0175,
0211,0357,0271,0040,0000,0363,0245,0200,0301,0004,0211,0356,0215,0174,0020,0070,
0154,0004,0164,0016,0213,0135,0010,0053,0134,0010,0213,0135,0012,0033,0134,0012,
0163,0014,0212,0044,0206,0144,0020,0210,0044,0106,0071,0376,0162,0364,0211,0376,
0201,0376,0356,0007,0162,0326,0342,0322,0211,0356,0264,0020,0366,0344,0001,0306,
0200,0174,0004,0001,0162,0026,0353,0021,0204,0322,0175,0041,0211,0356,0200,0174,
0004,0000,0164,0013,0366,0004,0200,0164,0006,0350,0070,0000,0162,0053,0303,0203,
0306,0020,0201,0376,0376,0007,0162,0346,0350,0215,0000,0211,0007,0376,0302,0204,
0322,0174,0023,0315,0021,0321,0340,0321,0340,0200,0344,0003,0070,0342,0167,0355,
0350,0011,0000,0162,0350,0303,0350,0003,0000,0162,0146,0303,0211,0356,0214,0134,
0010,0214,0134,0012,0277,0003,0000,0122,0006,0127,0264,0010,0315,0023,0137,0007,
0200,0341,0077,0376,0306,0210,0310,0366,0346,0211,0303,0213,0104,0010,0213,0124,
0012,0367,0363,0222,0210,0325,0366,0361,0060,0322,0321,0352,0321,0352,0010,0342,
0210,0321,0376,0301,0132,0210,0306,0273,0000,0174,0270,0001,0002,0315,0023,0163,
0020,0200,0374,0200,0164,0011,0117,0174,0006,0060,0344,0315,0023,0163,0270,0371,
0303,0201,0076,0376,0175,0125,0252,0165,0001,0303,0350,0013,0000,0243,0007,0353,
0005,0350,0004,0000,0227,0007,0353,0376,0136,0255,0126,0211,0306,0254,0204,0300,
0164,0011,0264,0016,0273,0001,0000,0315,0020,0353,0362,0303,0057,0144,0145,0166,
0057,0150,0144,0077,0010,0000,0015,0012,0000,0116,0157,0156,0145,0040,0141,0143,
0164,0151,0166,0145,0015,0012,0000,0122,0145,0141,0144,0040,0145,0162,0162,0157,
0162,0040,0000,0116,0157,0164,0040,0142,0157,0157,0164,0141,0142,0154,0145,0040,
0000,0000,
};
int main(int argc, char *argv[])
{
int argn;
char *argp;
int ch;
/* Init */
nhead = DEFAULT_NHEAD;
nsec = DEFAULT_NSEC;
for (argn = 1; argn < argc && (argp = argv[argn])[0] == '-'; ++argn) {
if (argp[1] == 'h')
nhead = atoi(argp + 2);
else
if (argp[1] == 's') nsec = atoi(argp + 2);
else
usage();
override= 1;
}
if (argn == argc)
dev_name = DEFAULT_DEV;
else if (argn == argc - 1)
dev_name = argv[argn];
else
usage();
/* Align the sector buffer in such a way that the partition table is at
* a mod 4 offset in memory. Some weird people add alignment checks to
* their Minix!
*/
secbuf = rawsecbuf;
while ((long)(secbuf + PART_TABLE_OFF) % sizeof(long) != 0) secbuf++;
getgeom();
getboot(secbuf);
chk_table();
do {
putchar('\n');
dpl_partitions(0);
printf(
"\n(Enter 'h' for help. A null line will abort any operation) ");
ch = get_a_char();
putchar('\n');
switch (ch) {
case '+': footnotes(); break;
case 'a': toggle_active(ask_partition()); break;
case 'B': adj_base(ask_partition()); break;
case 'c': change_partition(ask_partition()); break;
case 'h': print_menu(); break;
case 'l': load_from_file(); break;
case 'm': mark_partition(ask_partition()); break;
case 'n': mark_npartition(ask_partition()); break;
case 'p': dpl_partitions(1); break;
case 0:
case 'q': exit(0);
case 'S': adj_size(ask_partition()); break;
case 's': save_to_file(); break;
case 't': list_part_types(); break;
case 'v':
printf("Partition table is %svalid\n",
chk_table() == OK ? "" : "in");
break;
case 'w':
if (readonly)
printf("Write disabled\n");
else if(chk_table() == OK) {
putboot(secbuf);
printf(
"Partition table has been updated and the file system synced.\n");
printf("Please reboot now.\n");
exit(0);
} else
printf("Not written\n");
break;
default: printf(" %c ????\n", ch); break;
}
}
while (1);
}
#ifdef UNIX
void getgeom(void)
{
struct part_geom geom;
int fd, r;
if (override) return;
if ((fd= open(dev_name, O_RDONLY)) < 0) return;
r = ioctl(fd, DIOCGETP, &geom);
close(fd);
if (r < 0) return;
nhead = geom.heads;
nsec = geom.sectors;
ncyl = geom.cylinders;
printf("Geometry of %s: %dx%dx%d\n", dev_name, ncyl, nhead, nsec);
}
static int devfd;
void getboot(char *buffer)
{
devfd = open(dev_name, 2);
if (devfd < 0) {
printf("No write permission on %s\n", dev_name);
readonly = 1;
devfd = open(dev_name, 0);
}
if (devfd < 0) {
printf("Cannot open device %s\n", dev_name);
exit(1);
}
if (read(devfd, buffer, SECSIZE) != SECSIZE) {
printf("Cannot read boot sector\n");
exit(1);
}
if (* (unsigned short *) &buffer[510] != 0xAA55) {
printf("Invalid boot sector on %s.\n", dev_name);
printf("Partition table reset and boot code installed.\n");
memset(buffer, 0, 512);
memcpy(buffer, bootstrap, sizeof(bootstrap));
* (unsigned short *) &buffer[510] = 0xAA55;
}
}
void putboot(char *buffer)
{
if (lseek(devfd, 0L, 0) < 0) {
printf("Seek error during write\n");
exit(1);
}
if (write(devfd, buffer, SECSIZE) != SECSIZE) {
printf("Write error\n");
exit(1);
}
sync();
}
#endif
void load_from_file(void)
{
/* Load buffer from file */
char file[80];
int fd;
printf("Enter name of file to load from: ");
if (!mygets(file, (int) sizeof file)) return;
fd = open(file, LOAD_OPEN_MODE);
if (fd < 0) {
printf("Cannot open %s\n", file);
return;
}
if (read(fd, secbuf, SECSIZE) != SECSIZE || close(fd) != 0) {
printf("Read error\n");
exit(1);
}
printf("Loaded from %s OK\n", file);
chk_table();
}
void save_to_file(void)
{
/* Save to file */
char file[80];
int fd;
printf("Enter name of file to save to: ");
if (!mygets(file, (int) sizeof file)) return;
if(chk_table() != OK) printf("Saving anyway\n");
fd = creat(file, SAVE_CREAT_MODE);
#ifdef DOS
if (fd < 0) {
printf("Cannot creat %s\n", file);
return;
}
close(fd);
fd = open(file, 0x8001);
#endif
if (fd < 0)
printf("Cannot open %s\n", file);
else if (write(fd, secbuf, SECSIZE) != SECSIZE || close(fd) != 0)
printf("Write error\n");
else
printf("Saved to %s OK\n", file);
}
void dpl_partitions(int rawflag)
{
/* Display partition table */
char active[5];
char basefootnote;
int cyl_mask;
int devnum;
char *format;
int i;
int i1;
char orderfootnote;
struct part_entry *pe;
struct part_entry *pe1;
int sec_mask;
char sizefootnote;
char type[10];
badbases = 0;
badsizes = 0;
badorders = 0;
if (rawflag) {
cyl_mask = 0; /* no contribution of cyl to sec */
sec_mask = 0xff;
format =
"%2d %3d%c %4s %-9s x%02x %3d x%02x x%02x %3d x%02x %7ld%c%7ld %7ld%c\n";
} else {
cyl_mask = CYL_MASK;
sec_mask = SEC_MASK;
format =
"%2d %3d%c %4s %-9s %4d %3d %3d %4d %3d %3d %7ld%c%7ld %7ld%c\n";
}
printf(
" ----first---- -----last---- --------sectors-------\n"
);
printf(
"Num Sorted Act Type Cyl Head Sec Cyl Head Sec Base Last Size\n"
);
pe = (struct part_entry *) &secbuf[PART_TABLE_OFF];
for (i = 1; i <= NR_PARTITIONS; i++, pe++) {
if (rawflag) {
sprintf(active, "0x%02x", pe->bootind);
sprintf(type, "0x%02x", pe->sysind);
} else {
sprintf(active, "%s", pe->bootind == ACTIVE_FLAG ? "A " : "");
sprintf(type, "%s", systype(pe->sysind));
}
/* Prepare warnings about confusing setups from old versions. */
basefootnote = orderfootnote = sizefootnote = ' ';
if (pe->sysind == MINIX_PART && pe->lowsec & 1) {
basefootnote = '+';
++badbases;
}
if (pe->size & 1) {
sizefootnote = '-';
++badsizes;
}
/* Calculate the "device numbers" resulting from the misguided sorting
* in the wini drivers. The drivers use this conditional for
* swapping wn[j] > wn[j+1]:
*
* if ((wn[j].wn_low == 0 && wn[j+1].wn_low != 0) ||
* (wn[j].wn_low > wn[j+1].wn_low && wn[j+1].wn_low != 0)) {
*
* which simplifies to:
*
* if (wn[j+1].wn_low != 0 &&
* (wn[j].wn_low == 0 || wn[j].wn_low > wn[j+1].wn_low)) {
*/
devnum = 1;
for (i1 = 1, pe1 = (struct part_entry *) &secbuf[PART_TABLE_OFF];
i1 <= NR_PARTITIONS; ++i1, ++pe1)
if ((pe1->lowsec == 0 && pe->lowsec == 0 && pe1 < pe) ||
(pe1->lowsec != 0 &&
(pe->lowsec == 0 || pe->lowsec > pe1->lowsec)))
++devnum; /* pe1 contents < pe contents */
if (devnum != i) {
orderfootnote = '#';
++badorders;
}
printf(format,
i,
devnum,
orderfootnote,
active,
type,
pe->start_cyl + ((pe->start_sec & cyl_mask) << CYL_SHIFT),
pe->start_head,
pe->start_sec & sec_mask,
pe->last_cyl + ((pe->last_sec & cyl_mask) << CYL_SHIFT),
pe->last_head,
pe->last_sec & sec_mask,
pe->lowsec,
basefootnote,
pe->lowsec + (pe->size == 0 ? 0 : pe->size - 1),
pe->size,
sizefootnote);
}
}
int chk_table(void)
{
/* Check partition table */
int active;
unsigned char cylinder;
unsigned char head;
int i;
int i1;
int maxhead;
int maxsec;
struct part_entry *pe;
struct part_entry *pe1;
unsigned char sector;
int seenpart;
int status;
active = 0;
maxhead = 0;
maxsec = 0;
pe = (struct part_entry *) &secbuf[PART_TABLE_OFF];
seenpart = 0;
status = OK;
for (i = 1; i <= NR_PARTITIONS; i++, ++pe) {
if (pe->bootind == ACTIVE_FLAG) active++;
sec_to_hst(pe->lowsec, &head, &sector, &cylinder);
if (pe->size == 0 && pe->lowsec == 0) sector = 0;
if (head != pe->start_head || sector != pe->start_sec ||
cylinder != pe->start_cyl) {
printf("Inconsistent base in partition %d.\n", i);
printf("Suspect head and sector parameters.\n");
status = ERR;
}
if (pe->size != 0 || pe->lowsec != 0)
sec_to_hst(pe->lowsec + pe->size - 1, &head, &sector, &cylinder);
if (head != pe->last_head || sector != pe->last_sec ||
cylinder != pe->last_cyl) {
printf("Inconsistent size in partition %d.\n", i);
printf("Suspect head and sector parameters.\n");
status = ERR;
}
if (pe->size == 0) continue;
seenpart = 1;
for (i1 = i + 1, pe1 = pe + 1; i1 <= NR_PARTITIONS; ++i1, ++pe1) {
if ((pe->lowsec >= pe1->lowsec &&
pe->lowsec < pe1->lowsec + pe1->size) ||
(pe->lowsec + pe->size - 1 >= pe1->lowsec &&
pe->lowsec + pe->size - 1 < pe1->lowsec + pe1->size))
{
printf("Overlap between partitions %d and %d\n",
i, i1);
status = ERR;
}
}
if (pe->lowsec + pe->size < pe->lowsec) {
printf("Overflow from preposterous size in partition %d.\n",
i);
status = ERR;
}
if (maxhead < pe->start_head) maxhead = pe->start_head;
if (maxhead < pe->last_head) maxhead = pe->last_head;
if (maxsec < (pe->start_sec & SEC_MASK))
maxsec = (pe->start_sec & SEC_MASK);
if (maxsec < (pe->last_sec & SEC_MASK))
maxsec = (pe->last_sec & SEC_MASK);
}
if (seenpart) {
if (maxhead + 1 != nhead || maxsec != nsec) {
printf(
"Disk appears to have mis-specified number of heads or sectors.\n");
printf("Try fdisk -h%d -s%d %s instead of\n",
maxhead + 1, maxsec, dev_name);
printf(" fdisk -h%d -s%d %s\n", nhead, nsec, dev_name);
seenpart = 0;
}
} else {
printf(
"Empty table - skipping test on number of heads and sectors.\n");
printf("Assuming %d heads and %d sectors.\n", nhead, nsec);
}
if (!seenpart) printf("Do not write the table if you are not sure!.\n");
if (active > 1) {
printf("%d active partitions\n", active);
status = ERR;
}
return(status);
}
void sec_to_hst(long logsec, unsigned char *hd, unsigned char *sec,
unsigned char *cyl)
{
/* Convert a logical sector number to head / sector / cylinder */
int bigcyl;
bigcyl = logsec / (nhead * nsec);
*sec = (logsec % nsec) + 1 + ((bigcyl >> CYL_SHIFT) & CYL_MASK);
*cyl = bigcyl;
*hd = (logsec % (nhead * nsec)) / nsec;
}
void mark_partition(struct part_entry *pe)
{
/* Mark a partition as being of type MINIX. */
if (pe != NULL) {
pe->sysind = MINIX_PART;
printf("Partition type is now MINIX\n");
}
}
void change_partition(struct part_entry *entry)
{
/* Get partition info : first & last cylinder */
int first, last;
long low, high;
int ch;
if (entry == NULL) return;
while (1) {
if (!get_an_int("\tEnter first cylinder (an integer >= 0): ", &first))
return;
if (first >= 0) break;
printf("\t\tThat looks like %d which is negative\n", first);
}
while (1) {
if (!get_an_int(
"\tEnter last cylinder (an integer >= the first cylinder): ", &last))
return;
if (last >= first) break;
printf("\t\tThat looks like %d which is too small\n", last);
}
if (first == 0 && last == 0) {
entry->bootind = 0;
entry->start_head = 0;
entry->start_sec = 0;
entry->start_cyl = 0;
entry->sysind = NO_PART;
entry->last_head = 0;
entry->last_sec = 0;
entry->last_cyl = 0;
entry->lowsec = 0;
entry->size = 0;
printf("Partition deleted\n");
return;
}
low = first & 0xffff;
low = low * nsec * nhead;
if (low == 0) low = 1; /* sec0 is master boot record */
high = last & 0xffff;
high = (high + 1) * nsec * nhead - 1;
entry->lowsec = low;
entry->size = high - low + 1;
if (entry->size & 1) {
/* Adjust size to even since Minix works with blocks of 2 sectors. */
--high;
--entry->size;
printf("Size reduced by 1 to make it even\n");
}
sec_to_hst(low, &entry->start_head, &entry->start_sec, &entry->start_cyl);
sec_to_hst(high, &entry->last_head, &entry->last_sec, &entry->last_cyl);
printf("Base of partition changed to %ld, size changed to %ld\n",
entry->lowsec, entry->size);
/* Accept the MINIX partition type. Usually ignore foreign types, so this
* fdisk can be used on foreign partitions. Don't allow NO_PART, because
* many DOS fdisks crash on it.
*/
if (entry->sysind == NO_PART) {
entry->sysind = MINIX_PART;
printf("Partition type changed from None to MINIX\n");
} else if (entry->sysind == MINIX_PART)
printf("Leaving partition type as MINIX\n");
else while (1) {
printf("\tChange partition type from %s to MINIX? (y/n) ",
systype(entry->sysind));
ch = get_a_char();
if (ch == 0 || ch == 'n') {
printf("Leaving partition type as %s\n",
systype(entry->sysind));
break;
} else if (ch == 'y') {
entry->sysind = MINIX_PART;
printf("Partition type changed from %s to MINIX\n",
systype(entry->sysind));
break;
}
}
if (entry->bootind == ACTIVE_FLAG)
printf("Leaving partition active\n");
else while (1) {
printf("\tChange partition to active? (y/n) ");
ch = get_a_char();
if (ch == 0 || ch == 'n') {
printf("Leaving partition inactive\n");
break;
} else if (ch == 'y') {
toggle_active(entry);
break;
}
}
}
char get_a_char(void)
{
/* Read 1 character and discard rest of line */
char buf[80];
if (!mygets(buf, (int) sizeof buf)) return(0);
return(*buf);
}
void print_menu(void)
{
printf("Type a command letter, then a carriage return:\n");
printf(" + - explain any footnotes (+, -, #)\n");
printf(" a - toggle an active flag\n");
printf(" B - adjust a base sector\n");
printf(" c - change a partition\n");
printf(" l - load boot block (including partition table) from a file\n");
printf(" m - mark a partition as a MINIX partition\n");
printf(" n - mark a partition as a non-MINIX partition\n");
printf(" p - print raw partition table\n");
printf(" q - quit without making any changes\n");
printf(" S - adjust a size (by changing the last sector)\n");
printf(" s - save boot block (including partition table) on a file\n");
printf(" t - print known partition types\n");
printf(" v - verify partition table\n");
if (readonly)
printf(" w - write (disabled)\n");
else
printf(" w - write changed partition table back to disk and exit\n");
}
/* Here are the DOS routines for reading and writing the boot sector. */
#ifdef DOS
union REGS regs;
struct SREGS sregs;
int drivenum;
void getboot(char *buffer)
{
/* Read boot sector */
segread(&sregs); /* get ds */
if (dev_name[1] != ':') {
printf("Invalid drive %s\n", dev_name);
exit(1);
}
if (*dev_name >= 'a') *dev_name += 'A' - 'a';
drivenum = (*dev_name - 'C') & 0xff;
if (drivenum < 0 || drivenum > 7) {
printf("Funny drive number %d\n", drivenum);
exit(1);
}
regs.x.ax = 0x201; /* read 1 sectors */
regs.h.ch = 0; /* cylinder */
regs.h.cl = 1; /* first sector = 1 */
regs.h.dh = 0; /* head = 0 */
regs.h.dl = 0x80 + drivenum; /* drive = 0 */
sregs.es = sregs.ds; /* buffer address */
regs.x.bx = (int) buffer;
int86x(0x13, &regs, &regs, &sregs);
if (regs.x.cflag) {
printf("Cannot read boot sector\n");
exit(1);
}
}
void putboot(char *buffer)
{
/* Write boot sector */
regs.x.ax = 0x301; /* read 1 sectors */
regs.h.ch = 0; /* cylinder */
regs.h.cl = 1; /* first sector = 1 */
regs.h.dh = 0; /* head = 0 */
regs.h.dl = 0x80 + drivenum; /* drive = 0 */
sregs.es = sregs.ds; /* buffer address */
regs.x.bx = (int) buffer;
int86x(0x13, &regs, &regs, &sregs);
if (regs.x.cflag) {
printf("Cannot write boot sector\n");
exit(1);
}
}
#endif
void adj_base(struct part_entry *pe)
{
/* Adjust base sector of partition, usually to make it even. */
int adj;
if (pe == NULL) return;
while (1) {
if (!get_an_int("\tEnter adjustment to base (an integer): ", &adj))
return;
if (pe->lowsec + adj < 1)
printf(
"\t\tThat would make the base %lu and too small\n", pe->lowsec + adj);
else if (pe->size - adj < 1)
printf(
"\t\tThat would make the size %lu and too small\n", pe->size - adj);
else
break;
}
pe->lowsec += adj;
pe->size -= adj;
sec_to_hst(pe->lowsec, &pe->start_head, &pe->start_sec, &pe->start_cyl);
printf("Base of partition adjusted to %ld, size adjusted to %ld\n",
pe->lowsec, pe->size);
}
void adj_size(struct part_entry *pe)
{
/* Adjust size of partition by reducing high sector. */
int adj;
if (pe == NULL) return;
while (1) {
if (!get_an_int("\tEnter adjustment to size (an integer): ", &adj))
return;
if (pe->size + adj >= 1) break;
printf("\t\tThat would make the size %lu and too small \n",
pe->size + adj);
}
pe->size += adj;
sec_to_hst(pe->lowsec + pe->size - 1,
&pe->last_head, &pe->last_sec, &pe->last_cyl);
printf("Size of partition adjusted to %ld\n", pe->size);
}
struct part_entry *ask_partition()
{
/* Ask for a valid partition number and return its entry. */
int num;
while (1) {
if (!get_an_int("Enter partition number (1 to 4): ", &num))
return(NULL);
if (num >= 1 && num <= NR_PARTITIONS) break;
printf("\tThat does not look like 1 to 4\n");
}
printf("Partition %d\n", num);
return((struct part_entry *) &secbuf[PART_TABLE_OFF] + (num - 1));
}
void footnotes(void)
{
/* Explain the footnotes. */
if (badbases != 0) {
printf(
"+ The old Minix wini drivers (before V1.5) discarded odd base sectors.\n");
printf(
" This causes some old (Minix) file systems to be offset by 1 sector.\n");
printf(
" To use these with the new drivers, increase the base by 1 using 'B'.\n");
}
if (badsizes != 0) {
if (badbases != 0) putchar('\n');
printf(
"- Minix cannot access the last sector on an odd-sized partition. This\n");
printf(
" causes trouble for programs like dosread. This program will by default\n");
printf(
" only create partitions with even sizes. If possible, the current odd\n");
printf(
" sizes should be decreased by 1 using 'S'. This is safe for all Minix\n");
printf(
" partitions, and may be safe for other partitions which are about to be\n");
printf(
" reformatted.\n");
}
if (badorders!= 0 ) {
if (badbases != 0 || badsizes != 0) putchar('\n');
printf(
"# The partitions are in a funny order. This is normal if they were created\n");
printf(
" by DOS fdisks prior to DOS 3.3. The Minix wini drivers further confuse\n");
printf(
" the order by sorting the partitions on their base. Be careful if the\n");
printf(
" device numbers of unchanged partitions have changed.\n");
}
}
int get_an_int(char *prompt, int *intptr)
{
/* Read an int from the start of line of stdin, discard rest of line. */
char buf[80];
while (1) {
printf("%s", prompt);
if (!mygets(buf, (int) sizeof buf)) return(0);
if ((sscanf(buf, "%d", intptr)) == 1) return(1);
printf("\t\tThat does not look like an integer\n");
}
}
void list_part_types(void)
{
/* Print all known partition types. */
int column;
int type;
for (column = 0, type = 0; type < 0x100; ++type)
if (strcmp(systype(type), "Unknown") != 0) {
printf("0x%02x: %-9s", type, systype(type));
column += 16;
if (column < 80)
putchar(' ');
else {
putchar('\n');
column = 0;
}
}
if (column != 0) putchar('\n');
}
void mark_npartition(struct part_entry *pe)
{
/* Mark a partition with arbitrary type. */
char buf[80];
unsigned type;
if (pe == NULL) return;
printf("\nKnown partition types are:\n\n");
list_part_types();
while (1) {
printf("\nEnter partition type (in 2-digit hex): ");
if (!mygets(buf, (int) sizeof buf)) return;
if (sscanf(buf, "%x", &type) != 1)
printf("Invalid hex number\n");
else if (type >= 0x100)
printf("Hex number too large\n");
else
break;
}
pe->sysind = type;
printf("Partition type changed to 0x%02x (%s)\n", type, systype(type));
}
int mygets(char *buf, int length)
{
/* Get a non-empty line of maximum length 'length'. */
while (1) {
fflush(stdout);
if (fgets(buf, length, stdin) == NULL) {
putchar('\n');
return(0);
}
if (strrchr(buf, '\n') != NULL) *strrchr(buf, '\n') = 0;
if (*buf != 0) return(1);
printf("Use the EOF character to create a null line.\n");
printf("Otherwise, please type something before the newline: ");
}
}
char *systype(int type)
{
/* Convert system indicator into system name. */
/* asw 01.03.95: added types based on info in kjb's part.c and output
* from Linux (1.0.8) fdisk. Note comments here, there are disagreements.
*/
switch(type) {
case NO_PART:
return("None");
case 1: return("DOS-12");
case 2: return("XENIX");
case 3: return("XENIX usr");
case 4: return("DOS-16");
case 5: return("DOS-EXT");
case 6: return("DOS-BIG");
case 7: return("HPFS");
case 8: return("AIX");
case 9: return("COHERENT"); /* LINUX says AIX bootable */
case 0x0a: return("OS/2"); /* LINUX says OPUS */
case 0x10: return("OPUS");
case 0x40: return("VENIX286");
case 0x51: return("NOVELL?");
case 0x52: return("MICROPORT");
case 0x63: return("386/IX"); /*LINUX calls this GNU HURD */
case 0x64: return("NOVELL286");
case 0x65: return("NOVELL386");
case 0x75: return("PC/IX");
case 0x80: return("MINIX old");
case 0x81: return("MINIX");
case 0x82: return("LINUXswap");
case 0x83: return("LINUX");
case 0x93: return("AMOEBA");
case 0x94: return("AMOEBAbad");
case 0xa5: return("386BSD");
case 0xb7: return("BSDI");
case 0xb8: return("BSDIswap");
case 0xc7: return("Syrinx");
case 0xDB: return("CP/M");
case 0xe1: return("DOS acc");
case 0xe3: return("DOS r/o");
case 0xf2: return("DOS 2ary");
case 0xFF: return("Badblocks");
default: return("Unknown");
}
}
void toggle_active(struct part_entry *pe)
{
/* Toggle active flag of a partition. */
if (pe == NULL) return;
pe->bootind = (pe->bootind == ACTIVE_FLAG) ? 0 : ACTIVE_FLAG;
printf("Partition changed to %sactive\n", pe->bootind ? "" : "in");
}
void usage(void)
{
/* Print usage message and exit. */
printf("Usage: fdisk [-hheads] [-ssectors] [device]\n");
exit(1);
}
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