begin working on MBR dump utility

Makefile

@@ -2,15 +2,17 @@ CC					=	gcc
 AS					=	as
 LD					=	ld
 OBJCOPY				=	objcopy
-CLFAGS				=	-g -Wall
-ASFLAGS				=
-LDFLAGS				=	-g
 QEMU				=	qemu-system-x86_64
 
 SRC_DIR				=	src
+INC_DIR				=	include
 OBJ_DIR				=	obj
 BIN_DIR				=	bin
 
+CLFAGS				=	-g -Wall -I$(INC_DIR)/
+ASFLAGS				=
+LDFLAGS				=	-g
+
 UID					:=	$(shell id -u)
 GID					:=	$(shell id -g)
 
@@ -97,6 +99,9 @@ $(OBJ_DIR)/%.o: $(SRC_DIR)/%.s
 	$(AS) $(ASFLAGS) -o $@ $<
 	$(OBJCOPY) --remove-section .note.gnu.property $@
 
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
 MBR_TEST_OBJ		=	obj/mbr_test.o obj/serial.o obj/itoa.o obj/util.o obj/test_disk_target.o
 
 mbr_test: $(MBR_TEST_OBJ) $(DISK)
@@ -123,6 +128,11 @@ mbr_test_qemu: mbr_test
 			-drive format=raw,media=disk,file=$(BIN_DIR)/mbr_test.bin	\
 			-drive format=raw,media=disk,file=$(BIN_DIR)/disk.img
 
+READMBR_OBJ			=	obj/readmbr.o
+
+readmbr: $(READMBR_OBJ)
+	$(CC) $(LDFLAGS) -o $(BIN_DIR)/readmbr $(READMBR_OBJ)
+
 clean:
 	rm -f bin/*
 	rm -f obj/*

src/readmbr.c

@@ -0,0 +1,53 @@
+// program to read MBR and its partition table
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdint.h>
+
+typedef struct {
+    uint8_t cylinder;
+    uint8_t head;
+    uint8_t sector;
+} __attribute__((packed)) chs_t;
+
+typedef struct {
+    uint8_t attributes;
+    chs_t chs_first;
+    uint8_t type;
+    chs_t chs_last;
+    uint32_t lba_start;
+    uint32_t num_sectors;
+} __attribute__((packed)) mbr_part_t;
+
+typedef struct {
+    char bootstrap[440];
+    uint32_t unique_id;
+    uint16_t reserved;
+    mbr_part_t part_table[4];
+    uint16_t signature;
+} __attribute__((packed)) mbr_t;
+
+int main(int argc, char** argv)
+{
+    mbr_t mbr;
+
+    // if (argc < 2)
+    // {
+    //     fputs("provide filename to disk image as first argument\n", stderr);
+    //     return 1;
+    // }
+
+    // int fd = open(argv[1], O_RDONLY);
+    // if (fd < 0)
+    // {
+    //     perror("failed to open disk image\n");
+    //     return 1;
+    // }
+
+
+    // close(fd);
+
+    printf("%lu\n", sizeof(mbr_t));
+    printf("%lu\n", sizeof(mbr_part_t));
+
+    return 0;
+}