568732/writepart.c

   1 #include <stddef.h>
   2 #include <stdio.h>
   3 #include <stdint.h>
   4 #include <string.h>
   5
   6 struct apartition {
   7         unsigned char flag;
   8         char id[3];
   9         uint32_t start;
  10         uint32_t size;
  11 } __attribute__((packed));
  12 struct rootsector {
  13         char unused[0x156];
  14         struct apartition icdpart[8];
  15         char unused2[0xc];
  16         struct apartition part[4];
  17 } __attribute__((packed));
  18 typedef struct _PARTITION {
  19         unsigned long start;
  20         char id[4];
  21         unsigned long rootsec;
  22 } PARTITION;
  23 int partitions;
  24 PARTITION part_table[64];
  25 static void PART2diskpart(PARTITION * cp, struct apartition *dp,
  26                           unsigned long relto)
  27 {
  28         memcpy(dp->id, cp->id, 3);
  29 }
  30
  31 void put_boot(int first_ext, int last_ext, PARTITION * master_XGM)
  32 {
  33         char buffer[sizeof(struct rootsector)];
  34         struct rootsector *rs = (struct rootsector *)buffer;
  35         struct apartition *pi;
  36         int i, bootable;
  37         PARTITION cont_XGM;
  38         pi = &rs->part[0];
  39         for (i = 0; i < partitions; ++i) {
  40                 if (i == first_ext) {
  41                         PART2diskpart(master_XGM, pi, 0);
  42                         PART2diskpart(&part_table[i], &rs->part[0],
  43                                       part_table[i].rootsec);
  44                         if (i == last_ext) {
  45                                 PART2diskpart(&cont_XGM, &rs->part[1],
  46                                               master_XGM->start);
  47                         }
  48                 }
  49         }
  50 }
  51
  52 main() {
  53         printf("%i\n", sizeof(struct rootsector));
  54         printf("%i %i\n", offsetof(struct rootsector, part[0]));
  55 }