Fix more to not append an extra newline.

More's sigatexit handler needs to distinguish between normal exit and exit
due to receipt of a signal.

Change tty_sigreset to look at the signal number too, so that pressing 'q'
to exit top doesn't cause its exit status to be 128.

lib/interestingtimes.c

@@ -239,5 +239,5 @@ void tty_reset(void)
 void tty_sigreset(int i)
 {
   tty_reset();
-  _exit(128+i);
+  _exit(i ? 128+i : 0);
 }

lib/xwrap.c

@@ -47,7 +47,9 @@ void xexit(void)
   // Call toys.xexit functions in reverse order added.
   while (toys.xexit) {
     // This is typecasting xexit->arg to a function pointer,then calling it.
-    ((void (*)(void))(toys.xexit->arg))();
+    // Using the invalid signal number 0 lets the signal handlers distinguish
+    // an actual signal from a regular exit.
+    ((void (*)(int))(toys.xexit->arg))(0);
 
     free(llist_pop(&toys.xexit));
   }

toys/pending/more.c

@@ -25,7 +25,12 @@ GLOBALS(
 
 static void signal_handler(int sig)
 {
+  // Reset the terminal whether we were signalled or exited normally.
   tcsetattr(TT.cin_fd, TCSANOW, &TT.inf);
+
+  if (sig == 0) _exit(0);
+
+  // We were actually signalled, so move to a new line and re-raise the signal.
   xputc('\n');
   signal(sig, SIG_DFL);
   raise(sig);