Simpler cat.

src/cat.zig

@@ -1,5 +1,5 @@
 const std = @import("std");
-const lib = @import("./lib.zig");
+const stdout = std.io.getStdOut().writer();
 
 pub fn main() anyerror!void {
     const args = try std.process.argsAlloc(std.heap.page_allocator);
@@ -8,34 +8,27 @@ pub fn main() anyerror!void {
         try print_input();
     }
 
-    const files = args[1..];
-    for (files) |f| {
+    for (args[1..]) |f| {
         if (std.mem.eql(u8, f, "-")) { try print_input();  }
         else                         { try print_file (f); }
     }
 }
 
 fn print_input() !void {
-    const stdin = std.io.getStdIn().reader();
-    var buffer: [4096]u8 = undefined;
-    while (true) {
-        const nbytes = try stdin.read(&buffer);
-        lib.print("{s}", .{buffer[0..nbytes]});
-        if (nbytes == 0) break;
-    }
+    try print_all (std.io.getStdIn());
 }
 
 fn print_file(dest: []const u8) !void {
-    // open file and defer closing
     var file = try std.fs.cwd().openFile(dest, .{ .mode = .read_only });
     defer file.close();
+    try print_all (file);
+}
 
-    // read file content and print everything
+fn print_all(reader: std.fs.File) !void {
     var buffer: [4096]u8 = undefined;
-    var nbytes : u64 = 0;
     while (true) {
-        nbytes = try file.read(&buffer);
-        lib.print("{s}", .{buffer[0..nbytes]});
+        const nbytes = try reader.read(&buffer);
+        try stdout.print("{s}", .{buffer[0..nbytes]});
         if (nbytes == 0) break;
     }
 }