hf fudan dump now supports the nosave flag

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]
+ - Changed `hf fudan dump --ns` - now supports nosave flag (@iceman1001)
  - Added `lf em 410x --electra` - adds two extra blocks. Thanks jareckib (@iceman1001)
  - Changed `hf mfu info` - now identifies UL-AES correct (@iceman1001)
  - Changed `hw detectreader` - Detect both LF and HF at the same time (@wh201906)

client/src/cmdhffudan.c

@@ -243,13 +243,15 @@ static int CmdHFFudanDump(const char *Cmd) {
     void *argtable[] = {
         arg_param_begin,
         arg_str0("f", "file", "<fn>", "Specify a filename for dump file"),
+        arg_lit0(NULL, "ns", "no save to file"),
         arg_param_end
     };
     CLIExecWithReturn(ctx, Cmd, argtable, true);
 
     int datafnlen = 0;
     char dataFilename[FILE_PATH_SIZE] = {0};
     CLIParamStrToBuf(arg_get_str(ctx, 1), (uint8_t *)dataFilename, FILE_PATH_SIZE, &datafnlen);
+    bool nosave = arg_get_lit(ctx, 2);
     CLIParserFree(ctx);
 
     // Select card to get UID/UIDLEN/ATQA/SAK information
@@ -329,6 +331,12 @@ static int CmdHFFudanDump(const char *Cmd) {
 
     fudan_print_blocks(num_blocks, carddata);
 
+    if (nosave) {
+        PrintAndLogEx(INFO, "Called with no save option");
+        PrintAndLogEx(NORMAL, "");
+        return PM3_SUCCESS;
+    }
+
     // create filename if none was given
     if (strlen(dataFilename) < 1) {
         char *fptr = GenerateFilename(&card, "hf-fudan-", "-dump");