[PATCH] scdaemon: Fix status info encoding

[David Härdeman]

I've been playing around a bit with private data objects using an OpenPGP
card when I noticed that writing binary data to an object and then reading
it back would sometime alter the data.

Example:
  $ echo -n "%41" > binfile
  $ od -tx1 binfile
  0000000 25 34 31
  0000003

  $ gpg --card-edit
  ....
  gpg/card> privatedo 1 < binfile

  gpg/card> verify
  ...
  Private DO 1 .....: A

Last line should have been:
  Private DO 1 .....: %41

Turns out that scdaemon does not properly escape the '%' character, meaning
that gpg-agent and gpg parse the unescaped '%' character.

Signed-off-by: David Härdeman <david at hardeman.nu>
---
 scd/command.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scd/command.c b/scd/command.c
index 3584593..a1fa060 100644
--- a/scd/command.c
+++ b/scd/command.c
@@ -2137,7 +2137,7 @@ send_status_info (ctrl_t ctrl, const char *keyword, ...)
         }
       for ( ; valuelen && n < DIM (buf)-2; n++, valuelen--, value++)
         {
-          if (*value < ' ' || *value == '+')
+          if (*value < ' ' || *value == '+' || *value == '%')
             {
               sprintf (p, "%%%02X", *value);
               p += 3;