libpayload: Add a timeout function for getchar and getch

Implement a timeout option for getchar() to return after so many
milliseconds.  Also implement the same thing for curses using
the halfdelay() function.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3223 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/libc/console.c

@@ -101,3 +101,19 @@ int getchar(void)
 #endif
 	}
 }
+
+int getchar_timeout(int *ms)
+{
+	while (*ms > 0) {
+		if (havekey())
+			return getchar();
+
+		mdelay(100);
+		*ms -= 100;
+	}
+
+	if (*ms < 0)
+		*ms = 0;
+
+	return 0;
+}