Add func stubs

src/multiboot2/header_is_valid.c

@@ -0,0 +1,14 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <kernaux/multiboot2.h>
+
+#include <stdbool.h>
+
+bool KernAux_Multiboot2_Header_is_valid(
+    const struct KernAux_Multiboot2_Header *const multiboot2_header
+) {
+    // TODO: write this
+    return false;
+}

src/multiboot2/header_print.c

@@ -0,0 +1,55 @@
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <kernaux/multiboot2.h>
+
+#include <stddef.h>
+
+static const char *KernAux_Multiboot2_HTag_to_str(
+    enum KernAux_Multiboot2_HTag tag_type
+);
+
+const char *KernAux_Multiboot2_HTag_to_str(
+    enum KernAux_Multiboot2_HTag tag_type
+) {
+    switch (tag_type) {
+    case KERNAUX_MULTIBOOT2_HTAG_NONE:
+        return "none";
+    case KERNAUX_MULTIBOOT2_HTAG_INFO_REQ:
+        return "information request";
+    case KERNAUX_MULTIBOOT2_HTAG_ADDR:
+        return "address";
+    case KERNAUX_MULTIBOOT2_HTAG_ENTRY_ADDR:
+        return "entry address";
+    case KERNAUX_MULTIBOOT2_HTAG_FLAGS:
+        return "flags";
+    case KERNAUX_MULTIBOOT2_HTAG_FRAMEBUFFER:
+        return "framebuffer";
+    case KERNAUX_MULTIBOOT2_HTAG_MODULE_ALIGN:
+        return "module alignment";
+    case KERNAUX_MULTIBOOT2_HTAG_EFI_BOOT_SERVICES:
+        return "EFI boot services";
+    case KERNAUX_MULTIBOOT2_HTAG_EFI_I386_ENTRY_ADDR:
+        return "EFI i386 entry address";
+    case KERNAUX_MULTIBOOT2_HTAG_EFI_AMD64_ENTRY_ADDR:
+        return "EFI AMD64 entry address";
+    case KERNAUX_MULTIBOOT2_HTAG_RELOCATABLE_HEADER:
+        return "relocatable header";
+    default:
+        return NULL;
+    }
+}
+
+void KernAux_Multiboot2_Header_print(
+    const struct KernAux_Multiboot2_Header *const multiboot2_header,
+    void (*const printf)(const char *format, ...) __attribute__((format(printf, 1, 2)))
+) {
+    printf("Multiboot 2 header\n");
+    printf("  magic: %u\n", multiboot2_header->magic);
+    printf("  arch: %u\n", multiboot2_header->arch);
+    printf("  size: %u\n", multiboot2_header->total_size);
+    printf("  checksum: %u\n", multiboot2_header->checksum);
+
+    // TODO: write this
+}

src/multiboot2/info_is_valid.c

@@ -4,6 +4,7 @@
 
 #include <kernaux/multiboot2.h>
 
+#include <stdbool.h>
 #include <stddef.h>
 
 bool KernAux_Multiboot2_Info_is_valid(