Fix some compiler warnings

xB.c

@@ -630,7 +630,7 @@ recovery_handler (int signum, siginfo_t *info, void *context)
 	const char *signal_name = NULL, *reason = NULL;
 	translate_signal_info (signum, &signal_name, info->si_code, &reason);
 
-	char buf[128], numbuf[8];
+	char buf[128], numbuf[16];
 	if (!signal_name)
 	{
 		snprintf (numbuf, sizeof numbuf, "%d", signum);

xC.c

@@ -287,12 +287,15 @@ input__str_tputs (struct str *s, const char *attribute)
 static bool
 input__adjust (struct input_pos *pos, int width)
 {
-	if (pos->x + width > g_terminal.columns)
+	if (width < 0)
+		width = 0;
+
+	if ((int) pos->x + width > g_terminal.columns)
 	{
 		pos->y++;
 		pos->x = width;
 	}
-	else if ((pos->x += width) == g_terminal.columns)
+	else if ((int) (pos->x += width) == g_terminal.columns)
 	{
 		pos->y++;
 		pos->x = 0;
@@ -13323,7 +13326,7 @@ app_input_format_buffer (void *user_data, struct input_buffer *buffer,
 		else if (iscntrl_ascii (cp))
 		{
 			char escaped[] = { '^', cp == 127 ? '?' : cp + 64 };
-			if (pos->x + 1 == g_terminal.columns)
+			if ((int) pos->x + 1 == g_terminal.columns)
 				str_append_c (output, ' ');
 			input__adjust (pos, 2);
 
@@ -13843,7 +13846,7 @@ build_editor_command (struct app_context *ctx, const char *filename)
 	// XXX: Looks a bit hackish, meddling in internals.
 	struct input_buffer *buffer = ctx->input->current;
 	size_t line_one_based = 1, column = 0;
-	for (int i = 0; i < (size_t) buffer->point; i++)
+	for (int i = 0; i < buffer->point; i++)
 	{
 		// Both VIM and Emacs use the caret notation with columns.
 		// Consciously leaving tabs broken, they're too difficult to handle.