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#include "dos.h" /* AN000 */
#include "fdisk.h" /* AN000 */
#include "subtype.h" /* AN000 */
#include "extern.h" /* AN000 */
/* */
void write_info_to_disk()
BEGIN
char i;
unsigned char j;
unsigned extended_location;
char extended_index;
char temp;
char first_found;
char changed_flag;
char temp_disk;
temp = c(NUL); /* AN009 */
temp_disk = cur_disk;
/* See if need to update the master boot record */
for (j = uc(0); j < number_of_drives; j++) /* AC000 */
BEGIN
/* Save disk number */
cur_disk = ((char)(j));
/* See if there were any errors on that drive */
if (good_disk[j])
BEGIN
for (i=c(0); i < c(4); i++) /* AC000 */
BEGIN
if (part_table[j][i].changed)
BEGIN
write_master_boot_to_disk(j);
break;
END
END
/* See if the extended partition exists - if not, don't fool with the logical*/
/* drives - there is nothing to point to thier structures. Otherwise you get into */
/* a chicken and the egg situation, where you are trying to write out 'deletes' of */
/* the logical drive based on the start of the extended partition, but there isn't one */
/* because it has already been deleted already. Bad things happen - PTM P941 */
if (find_partition_type(uc(EXTENDED))); /* AC000 */
BEGIN
/* See if any extended partitions need to be updated */
changed_flag = FALSE;
for (i=c(0);i <c(23); i++) /* AC000 */
BEGIN
if (ext_table[j][i].changed)
BEGIN
changed_flag = TRUE;
break;
END
END
if (changed_flag)
BEGIN
/* First,get them in order - drive letters are assigned in the order */
/* that they exist on the disk */
sort_ext_table(c(23)); /* AC000 */
for (i=c(0);i < c(23); i++) /* AC000 */
BEGIN
/* If there is a valid drive existing, write it out */
if (ext_table[j][sort[i]].sys_id != uc(0)) /* AC000 */
BEGIN
write_ext_boot_to_disk(i,j);
END
END
/* Find start of extended partition */
extended_index = find_partition_location(uc(EXTENDED)); /* AC000 */
extended_location = part_table[j][extended_index].start_cyl;
/* See if the first entry in EXTENDED DOS partition will be written out */
/* Need to find the first drive in the sorted list */
for (i=c(0);i < c(23); i++) /* AC000 */
BEGIN
if (ext_table[j][sort[i]].sys_id != uc(0)) /* AC000 */
BEGIN
temp = sort[i];
break;
END
END
/* See if drive written out */
if ((temp != c(NUL)) &&
(extended_location != ext_table[j][temp].start_cyl)) /* AC009 */
BEGIN
/* If not, make a special case and go do it */
/* Use the 24 entry in the array to set up a dummy entry */
/* This one isn't used for anything else */
/* Indicate this is special by passing along a deleted entry - the subroutine will catch it and handle correctly */
ext_table[j][23].sys_id = uc(0); /* AC000 */
ext_table[j][23].start_cyl = part_table[j][extended_index].start_cyl;
ext_table[j][23].start_head = uc(0); /* AC000 */
ext_table[j][23].start_sector = uc(1); /* AC000 */
/* Write out our modified first location - only pointer info will be sent to the disk*/
write_ext_boot_to_disk(c(23),j); /* AC000 */
END
END
END
END
END
cur_disk = temp_disk;
return;
END
/* */
char write_master_boot_to_disk(disk)
unsigned char disk;
BEGIN
unsigned char i;
unsigned j;
unsigned x;
unsigned temp;
unsigned long long_temp;
unsigned index;
char location;
unsigned byte_temp;
/* Clean out the boot_record */
for (j=u(0);j < u(BYTES_PER_SECTOR); j++) /* AC000 */
BEGIN
boot_record[j] = uc(0); /* AC000 */
END
/* Copy the master boot record to boot_record */
for (j=u(0); j < u(BYTES_PER_SECTOR); j++) /* AC000 */
BEGIN
boot_record[j] = master_boot_record[disk][j];
END
/* Copy the partition tables over - only bother with the changed ones */
for (i=uc(0); i < uc(4); i++) /* AC000 */
BEGIN
index = ((unsigned)i)*16;
if (part_table[disk][i].changed)
BEGIN
/* Get boot ind */
boot_record[0x1BE+(index)] = part_table[disk][i].boot_ind;
/* Start head */
boot_record[0x1BF+(index)] = part_table[disk][i].start_head;
/* Start sector - scramble it to INT 13 format*/
boot_record[0x1C0+(index)] = (part_table[disk][i].start_sector & 0x3F) |
((unsigned char)((part_table[disk][i].start_cyl/256) << 6));
/* Start cyl - scramble it to INT 13 format*/
boot_record[0x1C1+(index)] = ((unsigned char)(part_table[disk][i].start_cyl%256));
/* System id */
boot_record[0x1C2+(index)]= part_table[disk][i].sys_id;
/* End head */
boot_record[0x1C3+(index)] = part_table[disk][i].end_head;
/* End sector - scramble it to INT 13 format*/
boot_record[0x1C4+(index)] = (part_table[disk][i].end_sector & 0x3F) |
((unsigned char)((part_table[disk][i].end_cyl/256) << 6));
/* End cyl - scramble it to INT 13 format*/
boot_record[0x1C5+(index)] = ((unsigned char)(part_table[disk][i].end_cyl%256));
/* Relative sectors */
long_temp = part_table[disk][i].rel_sec;
boot_record[0x1C9+(index)] = uc((long_temp >> 24)); /* AC000 */
boot_record[0x1C8+(index)] = uc(((long_temp & 0x00FF0000l) >> 16)); /* AC000 */
boot_record[0x1C7+(index)] = uc(((long_temp & 0x0000FF00l) >> 8)); /* AC000 */
boot_record[0x1C6+(index)] = uc((long_temp & 0x000000FFl)); /* AC000 */
/* Number of sectors */
long_temp = part_table[disk][i].num_sec;
boot_record[0x1CD+(index)] = uc(long_temp >> 24); /* AC000 */
boot_record[0x1CC+(index)] = uc((long_temp & 0x00FF0000l) >> 16); /* AC000 */
boot_record[0x1CB+(index)] = uc((long_temp & 0x0000FF00l) >> 8); /* AC000 */
boot_record[0x1CA+(index)] = uc(long_temp & 0x000000FFl); /* AC000 */
END
END
boot_record[510] = uc(0x55); /* AC000 */
boot_record[511] = uc(0xAA); /* AC000 */
return(write_boot_record(u(0),disk)); /* AC000 */
END
/* */
char write_ext_boot_to_disk(entry,disk)
char entry;
unsigned char disk;
BEGIN
char i;
unsigned j;
unsigned long long_temp;
unsigned index;
char location;
char next_drive;
char pointer;
char write;
/* Clean out the boot_record */
for (j=u(0);j < u(BYTES_PER_SECTOR); j++) /* AC000 */
BEGIN
boot_record[j] = uc(0); /* AC000 */
END
/* First - setup the logical devices */
/* See if it has been deleted - if so, leave entries as zero */
/* Otherwise - go unscramble everything out of the arrays */
if (ext_table[disk][sort[entry]].sys_id != uc(0)) /* AC000 */
BEGIN
/* Get boot ind */
boot_record[0x1BE] = ext_table[disk][sort[entry]].boot_ind;
/* Start head */
boot_record[0x1BF] = ext_table[disk][sort[entry]].start_head;
/* Start sector - scramble it to INT 13 format*/
boot_record[0x1C0] = (ext_table[disk][sort[entry]].start_sector & 0x3F) |
((ext_table[disk][sort[entry]].start_cyl/256) << 6);
/* Start cyl - scramble it to INT 13 format*/
boot_record[0x1C1] = ((unsigned char)(ext_table[disk][sort[entry]].start_cyl%256));
/* System id */
boot_record[0x1C2]= ext_table[disk][sort[entry]].sys_id;
/* End head */
boot_record[0x1C3] = ext_table[disk][sort[entry]].end_head;
/* End sector - scramble it to INT 13 format*/
boot_record[0x1C4] = (ext_table[disk][sort[entry]].end_sector & 0x3F) |
((ext_table[disk][sort[entry]].end_cyl/256) << 6);
/* End cyl - scramble it to INT 13 format*/
boot_record[0x1C5] = ((unsigned char)(ext_table[disk][sort[entry]].end_cyl%256));
/* Relative sectors */
long_temp = ext_table[disk][sort[entry]].rel_sec;
boot_record[0x1C9] = uc((long_temp >> 24)); /* AC000 */
boot_record[0x1C8] = uc(((long_temp & 0x00FF0000l) >> 16)); /* AC000 */
boot_record[0x1C7] = uc(((long_temp & 0x0000FF00l) >> 8)); /* AC000 */
boot_record[0x1C6] = uc((long_temp & 0x000000FFl)); /* AC000 */
/* Number of sectors */
long_temp = ext_table[disk][sort[entry]].num_sec;
boot_record[0x1CD] = uc((long_temp >> 24)); /* AC000 */
boot_record[0x1CC] = uc(((long_temp & 0x00FF0000l) >> 16)); /* AC000 */
boot_record[0x1CB] = uc(((long_temp & 0x0000FF00l) >> 8)); /* AC000 */
boot_record[0x1CA] = uc((long_temp & 0x000000FFl)); /* AC000 */
END
/* set up pointer to next logical drive unless this is # 23 */
if (entry != c(22)) /* AC000 */
BEGIN
/* Find the drive to be pointed to */
pointer = entry+1;
/* Handle the special case of a deleted or empty first entry in partition*/
if (entry == c(23)) /* AC000 */
BEGIN
pointer = c(0); /* AC000 */
END
for (i = pointer; i <c(23); i++) /* AC000 */
BEGIN
next_drive = ((char)(INVALID));
/* Go look for the next valid drive */
if (ext_table[disk][sort[i]].sys_id != uc(0)) /* AC000 */
BEGIN
next_drive = sort[i];
break;
END
END
if (next_drive != ((char)(INVALID)))
BEGIN
/* Get boot ind */
boot_record[0x1CE] = uc(0); /* AC000 */
/* Start head */
boot_record[0x1CF] = uc(0); /* AC000 */
/* Start sector - scramble it to INT 13 format*/
boot_record[0x1D0] = uc(0x01) | ((ext_table[disk][next_drive].start_cyl/256) << 6); /* AC000 */
/* System id */
boot_record[0x1D2]= uc(EXTENDED); /* AC000 */
/* End head */
boot_record[0x1D3] = uc(max_head[disk] -1); /* AC004 */
/* End sector - scramble it to INT 13 format*/
boot_record[0x1D4] =(max_sector[disk] & 0x3F) | ((ext_table[disk][next_drive].end_cyl/256) << 6);
/* Start cyl - scramble it to INT 13 format*/
boot_record[0x1D1] = ((unsigned char)(ext_table[disk][next_drive].start_cyl%256));
/* End cyl - scramble it to INT 13 format*/
boot_record[0x1D5] = ((unsigned char)(ext_table[disk][next_drive].end_cyl%256));
/* Relative sectors - this is from the front of the extended volume */
/* Find the extended partition */
location = find_partition_location(uc(EXTENDED));
long_temp = ((unsigned long)(ext_table[disk][next_drive].start_cyl - part_table[disk][location].start_cyl))
* max_head[disk] * max_sector[disk];
boot_record[0x1D9] = uc((long_temp >> 24)); /* AC000 */
boot_record[0x1D8] = uc(((long_temp & 0x00FF0000l) >> 16)); /* AC000 */
boot_record[0x1D7] = uc(((long_temp & 0x0000FF00l) >> 8)); /* AC000 */
boot_record[0x1D6] = uc((long_temp & 0x000000FFl)); /* AC000 */
/* Number of sectors in the next volume*/
long_temp = ((unsigned long)(ext_table[disk][next_drive].end_cyl - ext_table[disk][next_drive].start_cyl+1))
* max_head[disk] * max_sector[disk];
boot_record[0x1DD] = uc((long_temp >> 24)); /* AC000 */
boot_record[0x1DC] = uc(((long_temp & 0x00FF0000l) >> 16)); /* AC000 */
boot_record[0x1DB] = uc(((long_temp & 0x0000FF00l) >> 8)); /* AC000 */
boot_record[0x1DA] = uc((long_temp & 0x000000FFl)); /* AC000 */
END
END
boot_record[510] = uc(0x55); /* AC000 */
boot_record[511] = uc(0xAA); /* AC000 */
/* Write the boot record out */
if (entry != c(23)) /* AC000 */
BEGIN
write = write_boot_record(ext_table[disk][sort[entry]].start_cyl,disk);
END
else
BEGIN
/* Write the special case of the first entry only having a pointer */
write = write_boot_record(ext_table[disk][23].start_cyl,disk);
END
return(write);
END
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