initial

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.22)
+project(libembpart C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_library(embpart embpart.c
+        mbr/mbr.c
+        mbr/mbr.h
+        ../test/main.c)

embpart.c

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+#include "embpart.h"
+
+#include <stdio.h>
+
+void hello(void) {
+    printf("Hello, World!\n");
+}

embpart.h

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+#ifndef EMBPART_EMBPART_H
+#define EMBPART_EMBPART_H
+
+#include "mbr/mbr.h"
+
+#endif //EMBPART_EMBPART_H

mbr/mbr.c

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+#include "mbr.h"
+
+#define MBR_PART_TABLE_OFFSET (446)
+
+const PartEntry *mbr_get_partitions(const uint8_t *mbr_sec) {
+    return (PartEntry *)(mbr_sec + MBR_PART_TABLE_OFFSET);
+}

mbr/mbr.h

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+#ifndef EMBPART_MBR_H
+#define EMBPART_MBR_H
+
+#include <stdint.h>
+
+// partition entry
+
+typedef struct {
+    uint8_t status; // partition status
+    uint8_t chsa_fa[3]; // CHS address of first absolute sector in partition
+    uint8_t part_type; // partition type
+    uint8_t chsa_la[3]; // CHS address of last absolute sector in partition
+    uint32_t lba_fa; // LBA of first absolute sector
+    uint32_t sector_count; // number of sectors the partition includes
+} PartEntry;
+
+/**
+ * Get pointer to partition table
+ * @param mbr_sec pointer to the sector containing the MBR, MUST BE DWORD ALIGNED
+ * @return pointer to first partition entry
+ */
+const PartEntry * mbr_get_partitions(const uint8_t * mbr_sec);
+
+#endif //EMBPART_MBR_H