NetBSD/sbin/edlabel/edlabel.c

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/* $NetBSD: edlabel.c,v 1.2 1996/01/30 18:34:07 thorpej Exp $ */
/*
* Copyright (c) 1995 Gordon W. Ross
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gordon W. Ross
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <fcntl.h>
#include <stdio.h>
#include <ctype.h>
/*
* This is a data-driven program
*/
struct field {
char *f_name;
int f_offset;
int f_type; /* 1:char, 2:short, 4:int, >4:string */
};
/* Table describing fields in the head of a disklabel. */
#define dloff(f) (int)(&((struct disklabel *)0)->f)
struct field label_head[] = {
{ " type_num", dloff(d_type), 2 },
{ " sub_type", dloff(d_subtype), 2 },
{ " type_name", dloff(d_typename), 16 },
{ " pack_name", dloff(d_packname), 16 },
{ " bytes/sector", dloff(d_secsize), 4 },
{ " sectors/track", dloff(d_nsectors), 4 },
{ " tracks/cylinder", dloff(d_ntracks), 4 },
{ " cylinders", dloff(d_ncylinders), 4 },
{ "sectors/cylinder", dloff(d_secpercyl), 4 },
/* Don't care about the others until later... */
0,
};
#undef dloff
char tmpbuf[64];
void
edit_head_field(v, f, modify)
void *v;
struct field *f;
int modify; /* also modify */
{
u_int8_t *cp;
u_int tmp;
cp = v;
cp += f->f_offset;
printf("%s: ", f->f_name);
/* Print current value... */
switch (f->f_type) {
case 1:
tmp = *cp;
printf("%d", tmp);
break;
case 2:
tmp = *((u_int16_t *)cp);
printf("%d", tmp);
break;
case 4:
tmp = *((u_int32_t *)cp);
printf("%d", tmp);
break;
default:
/* must be a string. */
strncpy(tmpbuf, (char*)cp, sizeof(tmpbuf));
printf("%s", tmpbuf);
break;
}
if (modify == 0) {
printf("\n");
return;
}
printf(" ? ");
fflush(stdout);
tmpbuf[0] = '\0';
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
if ((tmpbuf[0] == '\0') || (tmpbuf[0] == '\n')) {
/* no new value supplied. */
return;
}
/* store new value */
if (f->f_type <= 4)
if (sscanf(tmpbuf, "%d", &tmp) != 1)
return;
switch (f->f_type) {
case 1:
*cp = tmp;
break;
case 2:
*((u_int16_t *)cp) = tmp;
break;
case 4:
*((u_int32_t *)cp) = tmp;
break;
default:
/* Get rid of the trailing newline. */
tmp = strlen(tmpbuf);
if (tmp < 1)
break;
if (tmpbuf[tmp-1] == '\n')
tmpbuf[tmp-1] = '\0';
strncpy((char*)cp, tmpbuf, f->f_type);
break;
}
}
void
edit_head_all(d, modify)
struct disklabel *d;
int modify;
{
struct field *f;
/* Edit head stuff. */
for (f = label_head; f->f_name; f++)
edit_head_field(d, f, modify);
}
void
edit_partition(d, idx, modify)
struct disklabel *d;
int idx;
{
struct partition *p;
int start_cyl, cyls, trks, sects, tmp;
char letter;
if ((idx < 0) || (idx >= MAXPARTITIONS)) {
printf("bad partition index\n");
return;
}
p = &d->d_partitions[idx];
letter = 'a' + idx;
/* Print current value... */
start_cyl = p->p_offset / d->d_secpercyl;
printf("partition %c start cyl= %6d", letter, start_cyl);
if (p->p_offset % d->d_secpercyl) {
printf(" (bad start!)");
}
printf(", nblks= %9d ", p->p_size);
tmp = p->p_size;
sects = tmp % d->d_nsectors;
tmp /= d->d_nsectors;
trks = tmp % d->d_ntracks;
tmp /= d->d_ntracks;
cyls = tmp;
printf("(%d/%d/%d)\n", cyls, trks, sects);
if (modify == 0)
return;
/* Start cylinder: */
printf("partition %c start cyl: ", letter);
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
if (sscanf(tmpbuf, "%d", &tmp) == 1)
p->p_offset = tmp * d->d_secpercyl;
/* number of blocks, or cyls/trks/sects */
printf("length as <nblks> or <cyls/trks/sects> : ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
return;
tmp = sscanf(tmpbuf, "%d/%d/%d", &cyls, &trks, &sects);
if (tmp == 1)
p->p_size = cyls; /* really nblks! */
if (tmp == 3) {
tmp = cyls;
tmp *= d->d_ntracks;
tmp += trks;
tmp *= d->d_nsectors;
tmp += sects;
p->p_size = tmp;
}
}
/*****************************************************************/
void
check_divisors(d)
struct disklabel *d;
{
if (d->d_nsectors == 0) {
d->d_nsectors = 1;
printf("bad sect/trk, set to 1\n");
}
if (d->d_ntracks == 0) {
d->d_ntracks = 1;
printf("bad trks/cyl, set to 1\n");
}
if (d->d_ncylinders == 0) {
d->d_ncylinders = 1;
printf("bad cyls, set to 1\n");
}
if (d->d_secpercyl == 0) {
d->d_secpercyl = (d->d_nsectors * d->d_ntracks);
printf("bad sect/cyl, set to %d\n", d->d_secpercyl);
}
}
u_short
dkcksum(d)
struct disklabel *d;
{
u_short *start, *end;
u_short sum = 0;
start = (u_short *)d;
end = (u_short *)&d->d_partitions[d->d_npartitions];
while (start < end)
sum ^= *start++;
return (sum);
}
void
label_write(d, dn)
struct disklabel *d;
char *dn;
{
int fd;
d->d_magic = DISKMAGIC;
d->d_magic2 = DISKMAGIC;
d->d_checksum = 0;
d->d_checksum = dkcksum(d);
fd = open(dn, O_RDWR, 0);
if (fd < 0) {
perror(dn);
return;
}
if (ioctl(fd, DIOCWDINFO, d) < 0) {
perror("ioctl DIOCWDINFO");
}
close(fd);
}
void
label_read(dl, dn)
struct disklabel *dl;
char *dn;
{
int fd;
fd = open(dn, O_RDONLY, 0);
if (fd < 0) {
perror(dn);
exit(1);
}
if (ioctl(fd, DIOCGDINFO, dl) < 0) {
perror("ioctl DIOCGDINFO");
exit(1);
}
/* Make sure divisors are non-zero. */
check_divisors(dl);
close(fd);
}
/*****************************************************************/
void
label_print(dl, dn)
struct disklabel *dl;
char *dn;
{
struct field *f;
int i;
/* Print out head stuff. */
edit_head_all(dl, 0);
for (i = 0; i < 8; i++)
edit_partition(dl, i, 0);
}
char modify_cmds[] = "modify subcommands:\n\
@ : modify disk parameters\n\
a-h : modify partition\n\
q : quit this subcommand\n";
void
label_modify(dl, dn)
struct disklabel *dl;
char *dn;
{
int c;
printf(modify_cmds);
for (;;) {
printf("edlabel/modify> ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
break;
c = tmpbuf[0];
if ((c == '\0') || (c == '\n'))
continue; /* blank line */
if (c == 'q')
break;
if (c == '@') {
edit_head_all(dl, 1);
check_divisors(dl);
continue;
}
if ((c < 'a') || (c > 'q')) {
printf("bad input. ");
printf(modify_cmds);
continue;
}
edit_partition(dl, c - 'a', 1);
}
}
void
label_quit()
{
exit(0);
}
struct cmd {
void (*cmd_func)();
char *cmd_name;
char *cmd_descr;
} cmds[] = {
{ label_print, "print", "display the current disk label" },
{ label_modify, "modify", "prompt for changes to the label" },
{ label_write, "write", "write the new label to disk" },
{ label_quit, "quit", "terminate program" },
0,
};
void
menu()
{
struct cmd *cmd;
printf("edlabel menu:\n");
for (cmd = cmds; cmd->cmd_func; cmd++)
printf("%s\t- %s\n", cmd->cmd_name, cmd->cmd_descr);
}
main(argc, argv)
int argc;
char **argv;
{
struct disklabel dl;
struct cmd *cmd;
char *devname;
if (argc != 2) {
fprintf(stderr, "usage: edlabel RAWDISK\n");
exit(1);
}
devname = argv[1];
label_read(&dl, devname);
menu();
for (;;) {
printf("edlabel> ");
fflush(stdout);
if (fgets(tmpbuf, sizeof(tmpbuf), stdin) == NULL)
break;
for (cmd = cmds; cmd->cmd_func; cmd++)
if (cmd->cmd_name[0] == tmpbuf[0])
goto found;
printf("Invalid command. ");
menu();
continue;
found:
cmd->cmd_func(&dl, devname);
}
exit(0);
}