gpg: New %U expando for the photo viewer.

* g10/photoid.c (show_photos): Set namehash.
* g10/misc.c (pct_expando): Add "%U" expando.
--

This makes is possible to extract all photos ids from a key to
different files.

(cherry picked from commit e184a11f94)

Resolved conflicts:
	g10/photoid.c - whitespaces

doc/gpg.texi

@@ -1177,7 +1177,7 @@ for the key fingerprint, "%t" for the extension of the image type
 (e.g. "jpg"), "%T" for the MIME type of the image (e.g. "image/jpeg"),
 "%v" for the single-character calculated validity of the image being
 viewed (e.g. "f"), "%V" for the calculated validity as a string (e.g.
-"full"),
+"full"), "%U" for a base32 encoded hash of the user ID,
 and "%%" for an actual percent sign. If neither %i or %I are present,
 then the photo will be supplied to the viewer on standard input.
 

g10/main.h

@@ -109,6 +109,7 @@ struct expando_args
   byte imagetype;
   int validity_info;
   const char *validity_string;
+  const byte *namehash;
 };
 
 char *pct_expando(const char *string,struct expando_args *args);

g10/misc.c

@@ -648,6 +648,23 @@ pct_expando(const char *string,struct expando_args *args)
 		}
 	      break;
 
+	    case 'U': /* z-base-32 encoded user id hash. */
+              if (args->namehash)
+                {
+                  char *tmp = zb32_encode (args->namehash, 8*20);
+                  if (tmp)
+                    {
+                      if (idx + strlen (tmp) < maxlen)
+                        {
+                          strcpy (ret+idx, tmp);
+                          idx += strlen (tmp);
+                        }
+                      xfree (tmp);
+                      done = 1;
+                    }
+                }
+	      break;
+
 	    case 'c': /* signature count from card, if any. */
 	      if(idx+10<maxlen)
 		{

g10/photoid.c

@@ -297,11 +297,12 @@ show_photos(const struct user_attribute *attrs,
   u32 len;
   u32 kid[2]={0,0};
 
-  memset(&args,0,sizeof(args));
-  args.pk=pk;
-  args.sk=sk;
-  args.validity_info=get_validity_info(pk,uid);
-  args.validity_string=get_validity_string(pk,uid);
+  memset (&args, 0, sizeof(args));
+  args.pk = pk;
+  args.validity_info = get_validity_info (pk, uid);
+  args.validity_string = get_validity_string (pk, uid);
+  namehash_from_uid (uid);
+  args.namehash = uid->namehash;
 
   if(pk)
     keyid_from_pk(pk,kid);