get_key: Valid key values are positive

Make sure we return positive values for valid keystrokes.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/com32/elflink/ldlinux/get_key.c b/com32/elflink/ldlinux/get_key.c
index 5841d02..0be06b9 100644 (file)
--- a/com32/elflink/ldlinux/get_key.c
+++ b/com32/elflink/ldlinux/get_key.c
@@ -167,7 +167,7 @@ int get_key(FILE * f, clock_t timeout)
            clock_t lateness = times(NULL) - start;
            if (nc && lateness > 1 + KEY_TIMEOUT) {
                if (nc == 1)
-                   return buffer[0];   /* timeout in sequence */
+                   return (unsigned char)buffer[0];    /* timeout */
                else if (timeout && lateness > timeout)
                    return KEY_NONE;
            } else if (!nc && timeout && lateness > timeout)
@@ -194,5 +194,5 @@ int get_key(FILE * f, clock_t timeout)
 
     /* We got an unrecognized sequence; return the first character */
     /* We really should remember this and return subsequent characters later */
-    return buffer[0];
+    return (unsigned char)buffer[0];
 }