Add etc hosts replication

src/hosts.zig

@@ -1,6 +1,39 @@
 const std = @import("std");
 const util = @import("util.zig");
 
-pub fn update_hosts(ips: util.IP) !void {
-    std.debug.print("{}\n", .{ips});
+pub fn update_hosts(ip: util.IP) !void {
+    try create_tmp_hosts(ip);
+    try move_tmp_hosts();
 }
+
+fn create_tmp_hosts(ip: util.IP) !void {
+    _ = ip;
+
+    var old_hosts = try std.fs.openFileAbsolute("/etc/hosts", .{ .mode = .read_only });
+    defer old_hosts.close();
+    var tmp_hosts = try std.fs.createFileAbsolute("/tmp/hosts", .{ .truncate = true });
+    defer tmp_hosts.close();
+
+    var buff = [_]u8{0x00} ** 50;
+    var buff_stream = std.io.fixedBufferStream(&buff);
+    const buff_reader = buff_stream.reader();
+    const buff_writer = buff_stream.writer();
+    var old_reader = old_hosts.reader();
+    const tmp_writer = tmp_hosts.writer();
+
+    while (old_reader.streamUntilDelimiter(buff_writer, '\n', 50 - 1)) |_| {
+        var n = buff_stream.pos;
+        // do things to line
+
+        buff[n] = '\n';
+        n += 1;
+        buff_stream.pos = 0;
+        try buff_reader.streamUntilDelimiter(tmp_writer, '\n', 50);
+        try tmp_writer.writeByte('\n');
+        buff_stream.pos = 0;
+    } else |_| {
+        // EOF
+    }
+}
+
+fn move_tmp_hosts() !void {}

src/main.zig

@@ -6,6 +6,6 @@ const hosts = @import("hosts.zig");
 pub fn main() !void {
     try util.check_perms();
     const domain, const ip_ver = try util.get_input();
-    const ips = try mdns.get_mdns(domain, ip_ver);
-    try hosts.update_hosts(ips);
+    const ip = try mdns.get_mdns(domain, ip_ver);
+    try hosts.update_hosts(ip);
 }