chore: special case saving for ROMS without titles

src/bus/backup.zig

@@ -2,8 +2,8 @@ const std = @import("std");
 const Allocator = std.mem.Allocator;
 const log = std.log.scoped(.Backup);
 
-const correctTitle = @import("../util.zig").correctTitle;
+const escape = @import("../util.zig").escape;
-const safeTitle = @import("../util.zig").safeTitle;
+const asString = @import("../util.zig").asString;
 const intToBytes = @import("../util.zig").intToBytes;
 
 const backup_kinds = [5]Needle{
@@ -76,6 +76,11 @@ pub const Backup = struct {
         const file_path = try self.getSaveFilePath(path);
         defer self.alloc.free(file_path);
 
+        // FIXME: Don't rely on this lol
+        if (std.mem.eql(u8, file_path[file_path.len - 12 .. file_path.len], "untitled.sav")) {
+            return log.err("ROM header lacks title, no save loaded", .{});
+        }
+
         const file: std.fs.File = try std.fs.openFileAbsolute(file_path, .{});
         const file_buf = try file.readToEndAlloc(self.alloc, try file.getEndPos());
         defer self.alloc.free(file_buf);
@@ -98,7 +103,10 @@ pub const Backup = struct {
                     return log.info("Loaded Save from {s}", .{file_path});
                 }
 
-                log.err("EEPROM can either be 0x200 bytes or 0x2000 byes, but {s} was {X:} bytes", .{ file_path, file_buf.len, });
+                log.err("EEPROM can either be 0x200 bytes or 0x2000 byes, but {s} was {X:} bytes", .{
+                    file_path,
+                    file_buf.len,
+                });
             },
             .None => return SaveError.UnsupportedBackupKind,
         }
@@ -112,8 +120,10 @@ pub const Backup = struct {
     }
 
     fn getSaveFilename(self: *const Self) ![]const u8 {
-        const title = correctTitle(safeTitle(self.title));
+        const title = asString(escape(self.title));
-        return try std.mem.concat(self.alloc, u8, &[_][]const u8{ title, ".sav" });
+        const name = if (title.len != 0) title else "untitled";
+
+        return try std.mem.concat(self.alloc, u8, &[_][]const u8{ name, ".sav" });
     }
 
     fn writeSaveToDisk(self: Self, path: []const u8) !void {

src/main.zig

@@ -29,7 +29,7 @@ const is_binary: bool = false;
 const log = std.log.scoped(.GUI);
 pub const log_level = if (builtin.mode != .Debug) .info else std.log.default_level;
 
-const correctTitle = @import("util.zig").correctTitle;
+const asString = @import("util.zig").asString;
 
 pub fn main() anyerror!void {
     // Allocator for Emulator + CLI
@@ -106,7 +106,7 @@ pub fn main() anyerror!void {
     defer emu_thread.join();
 
     var title_buf: [0x20]u8 = std.mem.zeroes([0x20]u8);
-    const window_title = try std.fmt.bufPrint(&title_buf, "ZBA | {s}", .{correctTitle(cpu.bus.pak.title)});
+    const window_title = try std.fmt.bufPrint(&title_buf, "ZBA | {s}", .{asString(cpu.bus.pak.title)});
 
     const window = createWindow(window_title, gba_width, gba_height);
     defer SDL.SDL_DestroyWindow(window);

src/util.zig

@@ -60,7 +60,7 @@ pub fn intToBytes(comptime T: type, value: anytype) [@sizeOf(T)]u8 {
 ///
 /// This function returns a slice of everything just before the first
 /// `\0`
-pub fn correctTitle(title: [12]u8) []const u8 {
+pub fn asString(title: [12]u8) []const u8 {
     var len = title.len;
     for (title) |char, i| {
         if (char == 0) {
@@ -76,7 +76,7 @@ pub fn correctTitle(title: [12]u8) []const u8 {
 /// array consisting of ASCII that won't make any file system angry
 ///
 /// e.g. POKEPIN R/S to POKEPIN R_S
-pub fn safeTitle(title: [12]u8) [12]u8 {
+pub fn escape(title: [12]u8) [12]u8 {
     var result: [12]u8 = title;
 
     for (result) |*char| {