.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
     runs-on: ${{matrix.os}}
     steps:
-      - uses: goto-bus-stop/setup-zig@v2
+      - uses: goto-bus-stop/setup-zig@v1
         with:
           version: master
       - name: prepare-linux
@@ -51,7 +51,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: true
-      - uses: goto-bus-stop/setup-zig@v2
+      - uses: goto-bus-stop/setup-zig@v1
         with:
           version: master
       - run: zig fmt src/**/*.zig

src/core/bus/backup.zig

@@ -6,6 +6,7 @@ const Eeprom = @import("backup/eeprom.zig").Eeprom;
 const Flash = @import("backup/Flash.zig");
 
 const escape = @import("../../util.zig").escape;
+const span = @import("../../util.zig").span;
 
 const Needle = struct { str: []const u8, kind: Backup.Kind };
 const backup_kinds = [6]Needle{
@@ -194,7 +195,7 @@ pub const Backup = struct {
     }
 
     fn saveName(self: *const Self, allocator: Allocator) ![]const u8 {
-        const title_str = std.mem.sliceTo(&escape(self.title), 0);
+        const title_str = span(&escape(self.title));
         const name = if (title_str.len != 0) title_str else "untitled";
 
         return try std.mem.concat(allocator, u8, &[_][]const u8{ name, ".sav" });

src/platform.zig

@@ -9,6 +9,8 @@ const Arm7tdmi = @import("core/cpu.zig").Arm7tdmi;
 const Scheduler = @import("core/scheduler.zig").Scheduler;
 const FpsTracker = @import("util.zig").FpsTracker;
 
+const span = @import("util.zig").span;
+
 const gba_width = @import("core/ppu.zig").width;
 const gba_height = @import("core/ppu.zig").height;
 
@@ -71,7 +73,7 @@ pub const Gui = struct {
 
         return Self{
             .window = window,
-            .title = std.mem.sliceTo(title, 0),
+            .title = span(title),
             .ctx = ctx,
             .program_id = program_id,
             .audio = Audio.init(apu),

src/util.zig

@@ -66,6 +66,57 @@ pub fn intToBytes(comptime T: type, value: anytype) [@sizeOf(T)]u8 {
     return result;
 }
 
+/// The Title from the GBA Cartridge is an Uppercase ASCII string which is
+/// null-padded to 12 bytes
+///
+/// This function returns a slice of the ASCII string without the null terminator(s)
+/// (essentially, a proper Zig/Rust/Any modern language String)
+pub fn span(title: *const [12]u8) []const u8 {
+    const end = std.mem.indexOfScalar(u8, title, '\x00');
+    return title[0 .. end orelse title.len];
+}
+
+test "span" {
+    var example: *const [12]u8 = "POKEMON_EMER";
+    try std.testing.expectEqualSlices(u8, "POKEMON_EMER", span(example));
+
+    example = "POKEMON_EME\x00";
+    try std.testing.expectEqualSlices(u8, "POKEMON_EME", span(example));
+
+    example = "POKEMON_EM\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKEMON_EM", span(example));
+
+    example = "POKEMON_E\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKEMON_E", span(example));
+
+    example = "POKEMON_\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKEMON_", span(example));
+
+    example = "POKEMON\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKEMON", span(example));
+
+    example = "POKEMO\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKEMO", span(example));
+
+    example = "POKEM\x00\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKEM", span(example));
+
+    example = "POKE\x00\x00\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POKE", span(example));
+
+    example = "POK\x00\x00\x00\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "POK", span(example));
+
+    example = "PO\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "PO", span(example));
+
+    example = "P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "P", span(example));
+
+    example = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
+    try std.testing.expectEqualSlices(u8, "", span(example));
+}
+
 /// Creates a copy of a title with all Filesystem-invalid characters replaced
 ///
 /// e.g. POKEPIN R/S to POKEPIN R_S