directory listing: Send viewport meta tag

[darkhttpd] / darkhttpd.c
diff --git a/darkhttpd.c b/darkhttpd.c

index 53363bd..e15d8de 100644 (file)
--- a/darkhttpd.c
+++ b/darkhttpd.c
@@ -1865,7 +1865,10 @@ static void generate_dir_listing(struct connection *conn, const char *path) {
      listing = make_apbuf();
      append(listing, "<html>\n<head>\n <title>");
      append(listing, conn->url);
-    append(listing, "</title>\n</head>\n<body>\n<h1>");
+    append(listing,
+            "</title>\n"
+            "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n"
+            "</head>\n<body>\n<h1>");
      append(listing, conn->url);
      append(listing, "</h1>\n<tt><pre>\n");
  
@@ -2370,6 +2373,10 @@ static ssize_t send_from_file(const int s, const int fd,
  static void poll_send_reply(struct connection *conn)
  {
      ssize_t sent;
+    /* off_t can be wider than size_t, avoid overflow in send_len */
+    const size_t max_size_t = ~((size_t)0);
+    off_t send_len = conn->reply_length - conn->reply_sent;
+    if (send_len > max_size_t) send_len = max_size_t;
  
      assert(conn->state == SEND_REPLY);
      assert(!conn->header_only);
@@ -2377,14 +2384,13 @@ static void poll_send_reply(struct connection *conn)
          assert(conn->reply_length >= conn->reply_sent);
          sent = send(conn->socket,
              conn->reply + conn->reply_start + conn->reply_sent,
-            (size_t)(conn->reply_length - conn->reply_sent), 0);
+            (size_t)send_len, 0);
      }
      else {
          errno = 0;
          assert(conn->reply_length >= conn->reply_sent);
          sent = send_from_file(conn->socket, conn->reply_fd,
-            conn->reply_start + conn->reply_sent,
-            (size_t)(conn->reply_length - conn->reply_sent));
+            conn->reply_start + conn->reply_sent, (size_t)send_len);
          if (debug && (sent < 1))
              printf("send_from_file returned %lld (errno=%d %s)\n",
                  (long long)sent, errno, strerror(errno));