Update to Zig 0.15.2

build.zig

@@ -22,10 +22,12 @@ pub fn build(b: *std.Build) !void {
 
     const kernel = b.addExecutable(.{
         .name = "kernel.elf",
+        .root_module = b.createModule(.{
             .root_source_file = b.path("src/main.zig"),
             .target = target,
             .optimize = .ReleaseFast,
             .code_model = .kernel,
+        }),
     });
     kernel.setLinkerScript(b.path("kernel.ld"));
 

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1742669843,
-        "narHash": "sha256-G5n+FOXLXcRx+3hCJ6Rt6ZQyF1zqQ0DL0sWAMn2Nk0w=",
+        "lastModified": 1762363567,
+        "narHash": "sha256-YRqMDEtSMbitIMj+JLpheSz0pwEr0Rmy5mC7myl17xs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1e5b653dff12029333a6546c11e108ede13052eb",
+        "rev": "ae814fd3904b621d8ab97418f1d0f2eb0d3716f4",
         "type": "github"
       },
       "original": {

src/Console.zig

@@ -20,18 +20,18 @@ pub const ConsoleColor = enum(u8) {
     red = 4,
     magenta = 5,
     brown = 6,
-    lightGray = 7,
-    darkGray = 8,
-    lightBlue = 9,
-    lightGreen = 10,
-    lightCyan = 11,
-    lightRed = 12,
-    lightMagenta = 13,
-    lightBrown = 14,
+    light_gray = 7,
+    dark_gray = 8,
+    light_blue = 9,
+    light_green = 10,
+    light_cyan = 11,
+    light_red = 12,
+    light_magenta = 13,
+    light_brown = 14,
     white = 15,
 };
 
-const default_color = vgaEntryColor(ConsoleColor.lightGray, ConsoleColor.black);
+const default_color = vgaEntryColor(ConsoleColor.light_gray, ConsoleColor.black);
 
 column: usize = 0,
 color: u8 = default_color,
@@ -115,21 +115,49 @@ pub fn puts(self: *Self, data: []const u8) void {
     }
 }
 
-const Writer = std.io.Writer(
-    *Self,
-    error{},
-    callback,
-);
+const Writer = struct {
+    console: *Self,
+    interface: std.Io.Writer,
 
-pub fn writer(self: *Self) Writer {
-    return .{ .context = self };
-}
+    fn drain(io_w: *std.Io.Writer, data: []const []const u8, splat: usize) std.Io.Writer.Error!usize {
+        const self: *@This() = @fieldParentPtr("interface", io_w);
 
-fn callback(self: *Self, string: []const u8) error{}!usize {
-    self.puts(string);
-    return string.len;
+        try self.puts(io_w.buffered());
+        io_w.end = 0;
+
+        for (data[0..data.len - 1]) |bytes| {
+            try self.puts(bytes);
+        }
+        const pattern = data[data.len - 1];
+        for (0..splat) |_| {
+            try self.puts(pattern);
+        }
+
+        return std.Io.Writer.countSplat(data, splat);
+    }
+
+    fn puts(self: *@This(), data: []const u8) std.Io.Writer.Error!void {
+        self.console.puts(data);
+    }
+};
+
+pub fn writer(self: *Self, buffer: []u8) Writer {
+    return .{
+        .console = self,
+        .interface = .{
+            .buffer = buffer,
+            .vtable = &.{
+                .drain = Writer.drain,
+            },
+        },
+    };
 }
 
 pub fn printf(self: *Self, comptime format: []const u8, args: anytype) void {
-    std.fmt.format(self.writer(), format, args) catch unreachable;
+    var buffer: [1024]u8 = undefined;
+    var w = self.writer(&buffer);
+    const io_w = &w.interface;
+    io_w.print(format, args) catch unreachable;
+    io_w.flush() catch unreachable;
 }
+

src/main.zig

@@ -20,7 +20,7 @@ export var mutliboot: MultibootHeader align(4) linksection(".multiboot") = .{
 
 var stack_bytes: [16 * 1024]u8 align(16) linksection(".bss") = undefined;
 
-export fn _start() callconv(.Naked) noreturn {
+export fn _start() callconv(.naked) noreturn {
     asm volatile (
         \\ movl %[stack_top], %%esp
         \\ movl %%esp, %%ebp
@@ -68,11 +68,12 @@ fn klog(
     const c = console.get();
 
     const color = switch (level) {
-        .err => Console.ConsoleColor.lightRed,
-        .warn => Console.ConsoleColor.lightBrown,
-        .info => Console.ConsoleColor.lightBlue,
-        .debug => Console.ConsoleColor.lightGreen,
+        .err => Console.ConsoleColor.light_red,
+        .warn => Console.ConsoleColor.light_brown,
+        .info => Console.ConsoleColor.light_blue,
+        .debug => Console.ConsoleColor.light_green,
     };
+
     c.putChar('[');
     c.setColor(color, Console.ConsoleColor.black);
     c.puts(level.asText());