Remove useless variable, enable removing only typed characters, change the way inputs are handled

src/main.c

@@ -1,4 +1,5 @@
 #include <arpa/inet.h>
+#include <ctype.h>
 #include <fcntl.h>
 #include <netdb.h>
 #include <signal.h>
@@ -174,9 +175,9 @@ main(int argc, char** argv)
         return 6;
     }
 
-    uint_fast8_t run = 1;
+    uintmax_t typed_in = 0;
 
-    do {
+    for (;;) {
         struct epoll_event events[2];
         int_fast8_t count = epoll_wait(epoll_fd, events, 2, -1);
         if (count == -1) {
@@ -219,9 +220,33 @@ main(int argc, char** argv)
                     return 9;
                 }
 
-                if (chr == '\n')
-                    putchar('\r');
+                switch (chr) {
+                    case '\b':
+                        if (!typed_in)
+                            continue;
+                        --typed_in;
+                        putchar('\b');
+                        putchar(' ');
+                        putchar('\b');
+                        break;
+                    case '\n':
+                        typed_in = 0;
+                        putchar('\n');
+                        putchar('\r');
+                        break;
+                    default:
+                        if (isprint(chr)) {
+                            ++typed_in;
+                            putchar(chr);
+                        }
+                }
+            } else {
+                fputs("ERROR: Event on an untracked file "
+                      "descriptor\n\r",
+                      stderr);
+                return 10;
             }
+            fflush(stdout);
         }
-    } while (run);
+    }
 }