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#include <stdio.h>
#include "tarboot.v"
#include "sysboot.v"
char tarblock[512];
char *bootblock = tarboot_data;
struct tar_head {
char name[100];
char mode[8];
char uid[8];
char gid[8];
char size[12];
char mtime[12];
char chksum[8];
char linkflag;
char linkname[100];
char magic[8];
char uname[32];
char gname[32];
char devmajor[8];
char devminor[8];
char padding[167];
} ;
#define head (*(struct tar_head*) tarblock)
#define boothead (*(struct tar_head*) bootblock)
int force = 0;
int relocatable = 0;
int tableload = 0;
long loadaddress = 0x8000;
long execaddress = 0x8000;
main(argc, argv)
int argc;
char ** argv;
{
int ar;
int done=0;
if( sizeof(head) != sizeof(tarblock) )
{ fprintf(stderr, "Program structure error\n"); exit(1); }
for(ar=1; ar<argc; ar++) if(argv[ar][0]=='-') switch(argv[ar][1])
{
case 'f': force++; break;
case 'r': relocatable++; break;
case 't': tableload++; break;
case 'l': sscanf(argv[ar]+2, "%li", &loadaddress); break;
case 'x': sscanf(argv[ar]+2, "%li", &execaddress); break;
case '?': Usage(1); break;
default: Usage(0); break;
}
else
{
mktarboot(argv[ar]);
done++;
}
}
Usage(flg)
int flg;
{
fprintf(stderr, "Usage: makeboot [-f] device\n");
exit(9);
}
mktarboot(fname)
char * fname;
{
FILE * fd;
fd = fopen(fname, "r+");
if( !fd ) { perror(fname); exit(1); }
if( fread(tarblock, sizeof(tarblock), 1, fd) != 1 )
{ fprintf(stderr, "Cannot read boot block\n"); exit(1); }
check_tar(1);
mangle_tarvol();
rewind(fd);
if( fwrite(tarblock, sizeof(tarblock), 1, fd) != 1 )
{ fprintf(stderr, "Cannot write boot block\n"); exit(1); }
rewind(fd);
if( fread(tarblock, sizeof(tarblock), 1, fd) != 1 )
{ fprintf(stderr, "Cannot re-read boot block\n"); exit(1); }
if( fread(tarblock, sizeof(tarblock), 1, fd) == 1 && head.linkflag == '0' )
printf("Boot block installed to boot file %s\n", head.name);
fclose(fd);
exit(0);
}
unsigned int oct(s)
char *s;
{
unsigned int val = 0;
int i;
for(i=0; i<8; i++) if( s[i] >= '0' && s[i] <= '7' )
val = (val<<3) + s[i] - '0';
return val;
}
check_tar(fatal)
int fatal;
{
char vbuf[100], *p;
unsigned int csum = 0;
long osum = -1;
osum = oct(head.chksum);
memset(head.chksum, ' ', sizeof(head.chksum));
for(p=tarblock; p<tarblock+sizeof(tarblock); p++)
csum += (*p & 0xFF);
if( csum != osum )
{
fprintf(stderr, "TAR file checksum failed, this isn't a tar file.\n");
if(fatal) exit(9);
return -1;
}
if( head.linkflag != 'V' )
{
fprintf(stderr, "Tar file doesn't start with a volume label\n");
if(fatal) exit(8);
return -1;
}
strcpy(vbuf, boothead.name); strcat(vbuf, " Volume 1");
if( !force && strcmp(boothead.name, head.name) != 0
&& strcmp(vbuf, head.name) != 0 )
{
fprintf(stderr, "Volume is labeled as '%s' not '%s'\n",
head.name, boothead.name);
fprintf(stderr, "Use -f flag to force write\n");
if(fatal) exit(1);
return -1;
}
return 0;
}
mangle_tarvol()
{
char lbuf[20];
char * p;
unsigned int csum = 0;
int i;
struct tar_head temp;
temp = boothead;
/* Copy preserved fields
*/
memcpy(temp.mtime, head.mtime, sizeof(temp.mtime));
memset(temp.name, 0x90, 16);
for(i=0; head.name[i] && head.name[i] != ' ' && i<14; i++)
{
int ch = head.name[i];
if( islower(ch) ) ch = toupper(ch);
if( strchr("/?@ABCDEFGHIJKLMNO", ch) == 0 )
ch = '?';
temp.name[i] = ch;
}
temp.name[i++] = 0;
temp.name[i] = 0xC0;
head = temp;
/* Calculate the checksum */
memset(head.chksum, ' ', sizeof(head.chksum));
for(p=tarblock; p<tarblock+sizeof(tarblock); p++)
csum += (*p & 0xFF);
sprintf(head.chksum, "%7o", csum);
}
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