Author: luporl
Date: Wed Jun 19 11:37:43 2019
New Revision: 349188
URL: https://svnweb.freebsd.org/changeset/base/349188

Log:
  [PPC] Fix loader input with newer QEMU versions
  
  At least since version 4.0.0, QEMU became bug-compatible with PowerVM's
  vty, by inserting a \0 after every \r. As this confuses loader's
  interpreter and as a \0 coming from the console doesn't seem reasonable,
  it's now being filtered at OFW console input.
  
  Reviewed by:  jhibbits
  MFC after:    2 weeks
  Differential Revision:        https://reviews.freebsd.org/D20676

Modified:
  head/stand/ofw/libofw/ofw_console.c

Modified: head/stand/ofw/libofw/ofw_console.c
==============================================================================
--- head/stand/ofw/libofw/ofw_console.c Wed Jun 19 11:22:09 2019        
(r349187)
+++ head/stand/ofw/libofw/ofw_console.c Wed Jun 19 11:37:43 2019        
(r349188)
@@ -97,7 +97,11 @@ ofw_cons_getchar()
                return l;
        }
 
-       if (OF_read(stdin, &ch, 1) > 0)
+       /* At least since version 4.0.0, QEMU became bug-compatible
+        * with PowerVM's vty, by inserting a \0 after every \r.
+        * As this confuses loader's interpreter and as a \0 coming
+        * from the console doesn't seem reasonable, it's filtered here. */
+       if (OF_read(stdin, &ch, 1) > 0 && ch != '\0')
                return (ch);
 
        return (-1);
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