mop3/sdutil/sdutil.c

#include <devices.h>
#include <fs_types.h>
#include <in_input.h>
#include <libfat.h>
#include <mprintf.h>
#include <process_self.h>
#include <status.h>
#include <str_status.h>
#include <strconv.h>
#include <string.h>
#include <system.h>
#include <tcursor.h>
#include <tscreen.h>

struct dos_pte {
  uint8_t drive_attrs;
  uint8_t chs_start_addr[3];
  uint8_t part_type;
  uint8_t chs_last_sect_addr[3];
  uint32_t start_lba;
  uint32_t sector_count;
} __attribute__ ((packed));

struct dos_mbr {
  uint8_t boot_code[440];
  uint8_t signature[4];
  uint8_t resv[2];
  struct dos_pte ptes[4];
  uint8_t valid_sign[2];
} __attribute__ ((packed));

static void lba_to_chs (uint32_t lba, uint8_t chs[3]) {
  uint32_t sectors_per_track = 63;
  uint32_t heads = 255;

  uint32_t cylinder = lba / (heads * sectors_per_track);
  uint32_t head = (lba / sectors_per_track) % heads;
  uint32_t sector = (lba % sectors_per_track) + 1;

  if (cylinder > 1023) {
    chs[0] = 254;
    chs[1] = 0xFF;
    chs[2] = 0xFF;
  } else {
    chs[0] = (uint8_t)head;
    chs[1] = (uint8_t)((sector & 0x3F) | ((cylinder >> 2) & 0xC0));
    chs[2] = (uint8_t)(cylinder & 0xFF);
  }
}

static void start_part_dos (void) {
  char dev_name[64];
  memset (dev_name, 0, sizeof (dev_name));
  struct dos_mbr mbr;
  memset (&mbr, 0, sizeof (mbr));
  char confirm_buf[4];
  memset (confirm_buf, 0, sizeof (confirm_buf));
  bool ok = false, write = false;

  in_stream_read_line ("Device name: ", dev_name, sizeof (dev_name));

#define prompt_partition(N)                                                                        \
  char p##N##_start_lba_str[12], p##N##_sector_cout_str[12];                                       \
  uint32_t p##N##_start_lba, p##N##_sector_count;                                                  \
  mprintf ("\nConfigure parition %d:\n", N);                                                       \
  in_stream_read_line ("Start LBA: ", p##N##_start_lba_str, sizeof (p##N##_start_lba_str));        \
  in_stream_read_line ("Sector count: ", p##N##_sector_cout_str, sizeof (p##N##_sector_cout_str)); \
  p##N##_start_lba = str_to_uint32 (p##N##_start_lba_str);                                         \
  p##N##_sector_count = str_to_uint32 (p##N##_sector_cout_str);

  prompt_partition (0);
  prompt_partition (1);
  prompt_partition (2);
  prompt_partition (3);

  mbr.ptes[0].start_lba = p0_start_lba;
  mbr.ptes[0].sector_count = p0_sector_count;
  lba_to_chs (p0_start_lba, mbr.ptes[0].chs_start_addr);
  lba_to_chs (p0_start_lba + p0_sector_count - 1, mbr.ptes[0].chs_last_sect_addr);

  mbr.ptes[1].start_lba = p1_start_lba;
  mbr.ptes[1].sector_count = p1_sector_count;
  lba_to_chs (p1_start_lba, mbr.ptes[1].chs_start_addr);
  lba_to_chs (p1_start_lba + p1_sector_count - 1, mbr.ptes[1].chs_last_sect_addr);

  mbr.ptes[2].start_lba = p2_start_lba;
  mbr.ptes[2].sector_count = p2_sector_count;
  lba_to_chs (p2_start_lba, mbr.ptes[2].chs_start_addr);
  lba_to_chs (p2_start_lba + p2_sector_count - 1, mbr.ptes[2].chs_last_sect_addr);

  mbr.ptes[3].start_lba = p3_start_lba;
  mbr.ptes[3].sector_count = p3_sector_count;
  lba_to_chs (p3_start_lba, mbr.ptes[3].chs_start_addr);
  lba_to_chs (p3_start_lba + p3_sector_count - 1, mbr.ptes[3].chs_last_sect_addr);

  mbr.valid_sign[0] = 0x55;
  mbr.valid_sign[1] = 0xAA;

  /* clang-format off */
  mprintf ("\n\n-------------------------------------------------------\n");
  mprintf ("Current configuration (%s):\n", dev_name);
  mprintf ("Partition 0: start LBA = %u, sector count = %zu\n",mbr.ptes[0].start_lba, mbr.ptes[0].sector_count);
  mprintf ("Partition 1: start LBA = %u, sector count = %zu\n",mbr.ptes[1].start_lba, mbr.ptes[1].sector_count);
  mprintf ("Partition 2: start LBA = %u, sector count = %zu\n",mbr.ptes[2].start_lba, mbr.ptes[2].sector_count);
  mprintf ("Partition 3: start LBA = %u, sector count = %zu\n",mbr.ptes[3].start_lba, mbr.ptes[3].sector_count);
  /* clang-format on */

  in_stream_read_line ("\nDoes this look plausible? [yes/no]: ", confirm_buf, sizeof (confirm_buf));

  if (strcmp (confirm_buf, "yes") == 0) {
    in_stream_read_line ("\nWrite to device? There's no going back! [yes/no]: ", confirm_buf,
                         sizeof (confirm_buf));

    ok = true;

    if (strcmp (confirm_buf, "yes") == 0) {
      write = true;
    } else {
      mprintf ("OK. Canceling\n");
    }
  } else {
    mprintf ("OK. Canceling\n");
  }

  if (ok && write) {
    size_t sector = 0;
    size_t sector_count = 1;
    int r = device_do (dev_name, XDRV_WRITE, &sector, &sector_count, &mbr, NULL);
    mprintf ("Finished writing. Result: %s (%d)\n", str_status[r < 0 ? -r : r], r);
  }
}

static void list_part_dos (const char* dev_name) {
  struct dos_mbr mbr;
  memset (&mbr, 0, sizeof (mbr));

  size_t sector = 0;
  size_t sector_count = 1;
  int r = device_do (dev_name, XDRV_READ, &sector, &sector_count, &mbr, NULL);
  mprintf ("Finished reading. Result: %s (%d)\n", str_status[r < 0 ? -r : r], r);

  if (!(mbr.valid_sign[0] == 0x55 && mbr.valid_sign[1] == 0xAA)) {
    mprintf ("ERROR invalid Master Boot Record!\n");
    return;
  }

  /* clang-format off */
  mprintf ("\n\n-------------------------------------------------------\n");
  mprintf ("Summary (%s):\n", dev_name);
  mprintf ("Partition 0: start LBA = %u, sector count = %zu\n",mbr.ptes[0].start_lba, mbr.ptes[0].sector_count);
  mprintf ("Partition 1: start LBA = %u, sector count = %zu\n",mbr.ptes[1].start_lba, mbr.ptes[1].sector_count);
  mprintf ("Partition 2: start LBA = %u, sector count = %zu\n",mbr.ptes[2].start_lba, mbr.ptes[2].sector_count);
  mprintf ("Partition 3: start LBA = %u, sector count = %zu\n",mbr.ptes[3].start_lba, mbr.ptes[3].sector_count);
  /* clang-format on */
}

static const char* spinner = "-\\|/";
static size_t spinner_state = 0;
static size_t sectors_done = 0;

static void format_update (size_t sector, size_t sector_count) {
  (void)sector;

  char spinner_char = spinner[(spinner_state++) % (sizeof (spinner) - 1)];
  mprintf (ANSIQ_CUR_SET_COL (0) ANSIQ_SCR_CLR2LEND "%c %zu", spinner_char, sectors_done);
  sectors_done += sector_count;
}

static void format_fat32 (const char* dev_name) {
  mprintf ("Formatting device %s!\n", dev_name);

  struct fatfs_ctx ctx;
  memset (&ctx, 0, sizeof (ctx));
  ctx.update_cb = &format_update;

  int r = fat_format_drive (&ctx, dev_name, FS_FAT32);

  mprintf ("\nFormatting done: %s (%d)\n", str_status[r < 0 ? -r : r], r);
}

static void format_fat16 (const char* dev_name) {
  mprintf ("Formatting device %s!\n", dev_name);

  struct fatfs_ctx ctx;
  memset (&ctx, 0, sizeof (ctx));
  ctx.update_cb = &format_update;

  int r = fat_format_drive (&ctx, dev_name, FS_FAT16);

  mprintf ("\nFormatting done: %s (%d)\n", str_status[r < 0 ? -r : r], r);
}

void app_main (void) {
  libprocess_self_init ();

  char commandbuf[32];
  memset (commandbuf, 0, sizeof (commandbuf));
  char devnamebuf[64];
  memset (devnamebuf, 0, sizeof (devnamebuf));

  if (env_get (process_get_pgid (), "C", (void*)commandbuf, sizeof (commandbuf)) != ST_OK) {
    mprintf ("ERROR C=???. No command provided\n");
    return;
  }

  if (strcmp (commandbuf, "part_dos") == 0) {
    start_part_dos ();
  } else if (strcmp (commandbuf, "list_part_dos") == 0) {
    if (env_get (process_get_pgid (), "dev", (void*)devnamebuf, sizeof (devnamebuf)) != ST_OK) {
      mprintf ("ERROR dev=???. No device name provided for list_part_dos\n");
      return;
    }

    list_part_dos (devnamebuf);
  } else if (strcmp (commandbuf, "format_fat32") == 0) {
    if (env_get (process_get_pgid (), "dev", (void*)devnamebuf, sizeof (devnamebuf)) != ST_OK) {
      mprintf ("ERROR dev=???. No device name provided for format_fat32\n");
      return;
    }

    format_fat32 (devnamebuf);
  } else if (strcmp (commandbuf, "format_fat16") == 0) {
    if (env_get (process_get_pgid (), "dev", (void*)devnamebuf, sizeof (devnamebuf)) != ST_OK) {
      mprintf ("ERROR dev=???. No device name provided for format_fat16\n");
      return;
    }

    format_fat16 (devnamebuf);
  } else {
    mprintf ("ERROR C=%s. Unknown command\n", commandbuf);
  }
}