Unknown state [2025-08-04]

zzd/main.zig

@@ -0,0 +1,50 @@
+const std = @import("std");
+
+pub fn main() !void {
+    var args = std.process.args();
+    defer args.deinit();
+
+    std.debug.assert(args.skip());
+
+    const filename = args.next() orelse {
+        std.debug.print("Invalid usage.\n", .{});
+        return;
+    };
+
+    const cwd = std.fs.cwd();
+    const file = try cwd.openFileZ(filename, .{
+        .mode = .read_only,
+        .lock = .none,
+    });
+    defer file.close();
+
+    var rb = std.io.bufferedReader(file.reader());
+    const in = rb.reader();
+
+    var stdout = std.io.getStdOut();
+    var bw = std.io.bufferedWriter(stdout.writer());
+
+    const out = bw.writer();
+
+    const N = 16;
+    const B = 2;
+
+    var idx: usize = 0;
+    while (in.readByte() catch null) |b| {
+        idx += 1;
+        try out.print("{x:0>2}", .{b});
+        if (idx % N == 0) {
+            try out.print("\n", .{});
+            idx = 0;
+        } else if (idx % B == 0) {
+            try out.print(" ", .{});
+        }
+    }
+
+    if (idx != 0) {
+        try out.print("\n", .{});
+    }
+    try out.writeByteNTimes('=', 2 * N + N / B - 1);
+
+    try bw.flush();
+}