From 187629b228d9b2f4a093b89737eaa9da57e3779e Mon Sep 17 00:00:00 2001
From: kamkow1 <kamkow256@gmail.com>
Date: Fri, 20 Mar 2026 22:34:05 +0100
Subject: [PATCH] sdutil Add list_part_dos command

---
 sdutil/sdutil.c | 39 ++++++++++++++++++++++++++++++++++++---
 1 file changed, 36 insertions(+), 3 deletions(-)

diff --git a/sdutil/sdutil.c b/sdutil/sdutil.c
index 7567a0e..ccc46bc 100644
--- a/sdutil/sdutil.c
+++ b/sdutil/sdutil.c
@@ -8,8 +8,6 @@
 #include <string.h>
 #include <system.h>
 
-#define COMMAND_MAX 32
-
 struct dos_pte {
   uint8_t drive_attrs;
   uint8_t chs_start_addr[3];
@@ -98,11 +96,37 @@ static void start_part_dos (void) {
   }
 }
 
+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 */
+}
+
 void app_main (void) {
   libprocess_self_init ();
 
-  char commandbuf[COMMAND_MAX];
+  char commandbuf[32];
   commandbuf[0] = '\0';
+  char devnamebuf[64];
+  devnamebuf[0] = '\0';
 
   if (env_get (process_get_pgid (), "C", (void*)commandbuf, sizeof (commandbuf)) != ST_OK) {
     mprintf ("ERROR C=???. No command provided\n");
@@ -111,5 +135,14 @@ void app_main (void) {
 
   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 {
+    mprintf ("ERROR C=%s. Unknown command\n", commandbuf);
   }
 }