Added option to wait for a card to hf 14a reader

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Added option to wait for a card to `hf 14a reader` (@doegox)
 - Added support for quick dump via backdoor auth to `hf mf ecfill` (@doegox)
 - Fixed `hf mf restore` - really skip strict ACLs unless --force (@doegox)
 - Added `hf 14b setuid` - set uid on magic 14b tag (@iceman1001)

client/src/cmdhf14a.c

@@ -558,6 +558,7 @@ static int CmdHF14AReader(const char *Cmd) {
         arg_lit0(NULL, "ecp", "Use enhanced contactless polling"),
         arg_lit0(NULL, "mag", "Use Apple magsafe polling"),
         arg_lit0("@", NULL, "continuous reader mode"),
+        arg_lit0("w", "wait", "wait for card"),
         arg_param_end
     };
     CLIExecWithReturn(ctx, Cmd, argtable, true);
@@ -589,8 +590,10 @@ static int CmdHF14AReader(const char *Cmd) {
     }
 
     bool continuous = arg_get_lit(ctx, 7);
+    bool wait = arg_get_lit(ctx, 8);
     CLIParserFree(ctx);
 
+    bool found = false;
     if (disconnectAfter == false) {
         cm |= ISO14A_NO_DISCONNECT;
     }
@@ -628,6 +631,8 @@ static int CmdHF14AReader(const char *Cmd) {
             */
             uint64_t select_status = resp.oldarg[0];
 
+            found = (select_status != 0);
+
             if (select_status == 0) {
                 DropField();
                 res = PM3_ESOFT;
@@ -682,7 +687,7 @@ plot:
             break;
         }
 
-    } while (continuous);
+    } while (continuous || (wait && (!found)));
 
     if (disconnectAfter == false) {
         if (silent == false) {