Checke Console::lineedit error return values

Console::lineedit can return -1 to indicate input error and -2 to
indicate the program is closing. But most users don't check possible
unusual return values which can lead to exit hang.

library/LuaTools.cpp

@@ -283,9 +283,6 @@ static int lua_dfhack_is_interactive(lua_State *S)
 
 static int dfhack_lineedit_sync(lua_State *S, Console *pstream)
 {
-    if (!pstream)
-        return 2;
-
     const char *prompt = luaL_optstring(S, 1, ">> ");
     const char *hfile = luaL_optstring(S, 2, NULL);
 
@@ -299,6 +296,9 @@ static int dfhack_lineedit_sync(lua_State *S, Console *pstream)
     if (rv < 0)
     {
         lua_pushnil(S);
+        if (rv == -2)
+            lua_pushstring(S, "shutdown requested");
+        else
             lua_pushstring(S, "input error");
         return 2;
     }
@@ -333,8 +333,11 @@ static int dfhack_lineedit(lua_State *S)
     lua_settop(S, 2);
 
     Console *pstream = get_console(S);
-    if (!pstream)
+    if (!pstream) {
+        lua_pushnil(S);
+        lua_pushstring(S, "no console");
         return 2;
+    }
 
     lua_rawgetp(S, LUA_REGISTRYINDEX, &DFHACK_QUERY_COROTABLE_TOKEN);
     lua_rawgetp(S, -1, S);
@@ -1058,7 +1061,11 @@ bool DFHack::Lua::RunCoreQueryLoop(color_ostream &out, lua_State *state,
             prompt = ">> ";
 
         std::string curline;
-        con.lineedit(prompt,curline,hist);
+        rv = con.lineedit(prompt,curline,hist);
+        if (rv < 0) {
+            rv = rv == -2 ? LUA_OK : LUA_ERRRUN;
+            break;
+        }
         hist.add(curline);
 
         {

library/lua/utils.lua

@@ -505,9 +505,10 @@ function prompt_yes_no(msg,default)
         prompt = prompt..' (y/n)[n]: '
     end
     while true do
-        local rv = dfhack.lineedit(prompt)
-        if rv then
-            if string.match(rv,'^[Yy]') then
+        local rv,err = dfhack.lineedit(prompt)
+        if not rv then
+            qerror(err);
+        elseif string.match(rv,'^[Yy]') then
             return true
         elseif string.match(rv,'^[Nn]') then
             return false
@@ -518,13 +519,15 @@ function prompt_yes_no(msg,default)
         end
     end
 end
-end
 
 -- Ask for input with check function
 function prompt_input(prompt,check,quit_str)
     quit_str = quit_str or '~~~'
     while true do
-        local rv = dfhack.lineedit(prompt)
+        local rv,err = dfhack.lineedit(prompt)
+        if not rv then
+            qerror(err);
+        end
         if rv == quit_str then
             qerror('User abort')
         end

plugins/Brushes.h

@@ -214,7 +214,7 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
                               bool hasConsole = true)
 {
     using namespace DFHack;
-    int newWidth = 0, newHeight = 0, newZLevels = 0;
+    int newWidth = 0, newHeight = 0, newZLevels = 0, rv = 0;
 
     if (end > start + 1)
     {
@@ -237,7 +237,8 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
 
             str.str("");
             str << "Set range width <" << width << "> ";
-            con.lineedit(str.str(), command, hist);
+            if ((rv = con.lineedit(str.str(), command, hist)) < 0)
+                return rv == -2 ? CR_OK : CR_FAILURE;
             hist.add(command);
             newWidth = command.empty() ? width : atoi(command.c_str());
         } else {
@@ -251,7 +252,8 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
 
             str.str("");
             str << "Set range height <" << height << "> ";
-            con.lineedit(str.str(), command, hist);
+            if ((rv = con.lineedit(str.str(), command, hist)) < 0)
+                return rv == -2 ? CR_OK : CR_FAILURE;
             hist.add(command);
             newHeight = command.empty() ? height : atoi(command.c_str());
         } else {
@@ -265,7 +267,8 @@ DFHack::command_result parseRectangle(DFHack::color_ostream & out,
 
             str.str("");
             str << "Set range z-levels <" << zLevels << "> ";
-            con.lineedit(str.str(), command, hist);
+            if ((rv = con.lineedit(str.str(), command, hist)) < 0)
+                return rv == -2 ? CR_OK : CR_FAILURE;
             hist.add(command);
             newZLevels = command.empty() ? zLevels : atoi(command.c_str());
         } else {

plugins/liquids.cpp

@@ -188,8 +188,9 @@ command_result df_liquids (color_ostream &out_, vector <string> & parameters)
         std::stringstream str;
         print_prompt(str, cur_mode);
         str << "# ";
-        if(out.lineedit(str.str(),input,liquids_hist) == -1)
-            return CR_FAILURE;
+        int rv;
+        if((rv = out.lineedit(str.str(),input,liquids_hist)) < 0)
+            return rv == -2 ? CR_OK : CR_FAILURE;
         liquids_hist.add(input);
 
         commands.clear();

plugins/mode.cpp

@@ -96,6 +96,7 @@ command_result mode (color_ostream &out_, vector <string> & parameters)
     string command = "";
     bool set = false;
     bool abuse = false;
+    int rv = 0;
     t_gamemodes gm;
     for(auto iter = parameters.begin(); iter != parameters.end(); iter++)
     {
@@ -139,9 +140,9 @@ command_result mode (color_ostream &out_, vector <string> & parameters)
             string selected;
             input_again:
             CommandHistory hist;
-            out.lineedit("Enter new mode: ",selected, hist);
-            if(selected == "c")
-                return CR_OK;
+            rv = out.lineedit("Enter new mode: ",selected, hist);
+            if(rv < 0 || selected == "c")
+                return rv == -2 ? CR_OK : CR_FAILURE;
             const char * start = selected.c_str();
             char * end = 0;
             select = strtol(start, &end, 10);
@@ -178,14 +179,14 @@ command_result mode (color_ostream &out_, vector <string> & parameters)
         {
             CommandHistory hist;
             string selected;
-            out.lineedit("Enter new game mode number (c for exit): ",selected, hist);
-            if(selected == "c")
-                return CR_OK;
+            rv = out.lineedit("Enter new game mode number (c for exit): ",selected, hist);
+            if(rv < 0 || selected == "c")
+                return rv == -2 ? CR_OK : CR_FAILURE;
             const char * start = selected.c_str();
             gm.g_mode = (GameMode) strtol(start, 0, 10);
-            out.lineedit("Enter new game type number (c for exit): ",selected, hist);
-            if(selected == "c")
-                return CR_OK;
+            rv = out.lineedit("Enter new game type number (c for exit): ",selected, hist);
+            if(rv < 0 || selected == "c")
+                return rv == -2 ? CR_OK : CR_FAILURE;
             start = selected.c_str();
             gm.g_type = (GameType) strtol(start, 0, 10);
         }

plugins/tiletypes.cpp

@@ -984,9 +984,10 @@ command_result df_tiletypes (color_ostream &out_, vector <string> & parameters)
         printState(out);
 
         std::string input = "";
+        int rv = 0;
 
-        if (out.lineedit("tiletypes> ",input,tiletypes_hist) == -1)
-            return CR_FAILURE;
+        if ((rv = out.lineedit("tiletypes> ",input,tiletypes_hist)) < 0)
+            return rv == -2 ? CR_OK : CR_FAILURE;
         tiletypes_hist.add(input);
 
         commands.clear();