catを修正

src/cat.zig

@@ -75,10 +75,17 @@ pub fn main() !void {
     }
 
     if (fname.items.len == 0) {
-        try help();
-        return;
+        const stdin = io.getStdIn().reader();
+        var buf: [2048]u8 = undefined;
+        while (true) {
+            const lne = try stdin.read(buf[0..]);
+            if (lne == 0) {
+                break;
             }
 
+            try io.getStdOut().writer().writeAll(buf[0..lne]);
+        }
+    } else {
         for (fname.items) |item| {
             const file = try fs.cwd().openFile(item, .{});
             defer file.close();
@@ -106,3 +113,4 @@ pub fn main() !void {
             }
         }
     }
+}