sbbs_t::xfer_prot_menu() can now return the list of command keys

for use by JS bbs.xtrn_prot_menu() immediately, elsewhere soon.

src/sbbs3/sbbs.h

@@ -765,7 +765,7 @@ public:
 	void	user_info(void);
 	void	xfer_policy(void);
 
-	void	xfer_prot_menu(enum XFER_TYPE);
+	char*	xfer_prot_menu(enum XFER_TYPE, user_t* user = nullptr, char* buf = nullptr, size_t size = 0);
 	void	node_stats(uint node_num);
 	void	sys_stats(void);
 	void	logonlist(const char* args = "");

src/sbbs3/str.cpp

@@ -1084,15 +1084,16 @@ const char* prot_menu_file[] = {
 	,"biprot"
 };
 
-void sbbs_t::xfer_prot_menu(enum XFER_TYPE type)
+char* sbbs_t::xfer_prot_menu(enum XFER_TYPE type, user_t* user, char* keys, size_t size)
 {
-	if(menu(prot_menu_file[type], P_NOERROR)) {
-		return;
-	}
+	size_t count = 0;
+	bool menu_used = menu(prot_menu_file[type], P_NOERROR);
+	if(user == nullptr)
+		user = &useron;
 	cond_blankline();
 	int printed=0;
 	for(int i=0;i<cfg.total_prots;i++) {
-		if(!chk_ar(cfg.prot[i]->ar,&useron,&client))
+		if(!chk_ar(cfg.prot[i]->ar, user, &client))
 			continue;
 		if(type==XFER_UPLOAD && cfg.prot[i]->ulcmd[0]==0)
 			continue;
@@ -1102,12 +1103,20 @@ void sbbs_t::xfer_prot_menu(enum XFER_TYPE type)
 			continue;
 		if(type==XFER_BATCH_DOWNLOAD && cfg.prot[i]->batdlcmd[0]==0)
 			continue;
+		if(keys != nullptr && count + 1 < size)
+			keys[count++] = cfg.prot[i]->mnemonic;
+		if(menu_used)
+			continue;
 		if(printed && (cols < 80 || (printed%2)==0))
 			CRLF;
 		bprintf(text[TransferProtLstFmt],cfg.prot[i]->mnemonic,cfg.prot[i]->name);
 		printed++;
 	}
-	newline();
+	if(keys != nullptr)
+		keys[count] = '\0';
+	if(!menu_used)
+		newline();
+	return keys;
 }
 
 void sbbs_t::node_stats(uint node_num)