Add funcs KernAux_Mbr*_is_valid

.gitignore

@@ -73,6 +73,7 @@
 /tests/test_cmdline
 /tests/test_elf
 /tests/test_itoa
+/tests/test_mbr
 /tests/test_multiboot2_header_helpers
 /tests/test_multiboot2_header_print
 /tests/test_multiboot2_header_validation

Makefile.am

@@ -60,6 +60,7 @@ endif
 
 if WITH_MBR
 libkernaux_a_SOURCES += src/mbr.c
+TESTS += tests/test_mbr
 endif
 
 if WITH_MULTIBOOT2
@@ -160,6 +161,10 @@ tests_test_itoa_SOURCES = \
 	$(libkernaux_a_SOURCES) \
 	tests/test_itoa.c
 
+tests_test_mbr_SOURCES = \
+	$(libkernaux_a_SOURCES) \
+	tests/test_mbr.c
+
 tests_test_multiboot2_header_helpers_SOURCES = \
 	$(libkernaux_a_SOURCES) \
 	tests/test_multiboot2_header_helpers.c \

include/kernaux/mbr.h

@@ -5,6 +5,7 @@
 extern "C" {
 #endif
 
+#include <stdbool.h>
 #include <stdint.h>
 
 #define KERNAUX_MBR_SIZE 512
@@ -38,6 +39,10 @@ struct KernAux_Mbr {
 }
 __attribute__((packed));
 
+bool KernAux_Mbr_is_valid(const struct KernAux_Mbr *mbr);
+bool KernAux_Mbr_Info_is_valid(const struct KernAux_Mbr_Info *mbr_info);
+bool KernAux_Mbr_Entry_is_valid(const struct KernAux_Mbr_Entry *mbr_entry);
+
 #ifdef __cplusplus
 }
 #endif

src/mbr.c

@@ -2,4 +2,38 @@
 #include "config.h"
 #endif
 
+#include <kernaux/assert.h>
 #include <kernaux/mbr.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+
+bool KernAux_Mbr_is_valid(const struct KernAux_Mbr *const mbr)
+{
+    KERNAUX_NOTNULL_RETVAL(mbr, false);
+
+    return KernAux_Mbr_Info_is_valid(&mbr->info);
+}
+
+bool KernAux_Mbr_Info_is_valid(const struct KernAux_Mbr_Info *const mbr_info)
+{
+    KERNAUX_NOTNULL_RETVAL(mbr_info, false);
+
+    if (mbr_info->magic != KERNAUX_MBR_MAGIC) return false;
+
+    for (size_t index = 0; index < KERNAUX_MBR_ENTRIES; ++index) {
+        if (!KernAux_Mbr_Entry_is_valid(&mbr_info->entries[index])) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool KernAux_Mbr_Entry_is_valid(const struct KernAux_Mbr_Entry *const mbr_entry)
+{
+    KERNAUX_NOTNULL_RETVAL(mbr_entry, false);
+
+    // TODO: implement this
+    return true;
+}

tests/test_mbr.c

@@ -0,0 +1,45 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <kernaux/mbr.h>
+
+#include <assert.h>
+#include <string.h>
+
+static void create_valid_mbr(struct KernAux_Mbr *mbr);
+
+int main()
+{
+    struct KernAux_Mbr mbr;
+
+    create_valid_mbr(&mbr);
+
+    assert(KernAux_Mbr_is_valid(&mbr));
+    assert(KernAux_Mbr_Info_is_valid(&mbr.info));
+    for (size_t index = 0; index < KERNAUX_MBR_ENTRIES; ++index) {
+        assert(KernAux_Mbr_Entry_is_valid(&mbr.info.entries[index]));
+    }
+
+    create_valid_mbr(&mbr);
+    mbr.info.magic = 123;
+
+    assert(!KernAux_Mbr_is_valid(&mbr));
+    assert(!KernAux_Mbr_Info_is_valid(&mbr.info));
+    for (size_t index = 0; index < KERNAUX_MBR_ENTRIES; ++index) {
+        assert(KernAux_Mbr_Entry_is_valid(&mbr.info.entries[index]));
+    }
+
+    // TODO: test partition table
+
+    return 0;
+}
+
+void create_valid_mbr(struct KernAux_Mbr *const mbr)
+{
+    memset(mbr, 0, sizeof(*mbr));
+
+    mbr->info.magic = KERNAUX_MBR_MAGIC;
+    mbr->info.disk_id = 0xCAFEBABE;
+    // TODO: fill partition table
+}