While starting, do not modify existing channel

i_keyboard/CMakeLists.txt

@@ -16,7 +16,7 @@ project(i_keyboard)
 find_package(blc_channel REQUIRED)
 find_package(blc_program REQUIRED)
 
-add_definitions(${BL_DEFINITIONS} -Wno-multichar)
+add_definitions(${BL_DEFINITIONS} -std=c++14 -W -Wall)
 include_directories(${BL_INCLUDE_DIRS})
 add_executable(i_keyboard src/i_keyboard.cpp)
 target_link_libraries(i_keyboard ${BL_LIBRARIES})

i_keyboard/src/i_keyboard.cpp

@@ -218,8 +218,8 @@ static void loop_float(){
     }
 }
 
-
 int main(int argc, char** argv){
+    bool created;
     char *default_output=NULL;
     char const *extension;
     char const *channel_name, *type_str,  *str_quitting_key,  *str_neutral_key, *max_str, *min_str,  *str_neutral_value, *toggle_mode, *step_size_str, *filename, *file_select_name;
@@ -276,7 +276,7 @@ int main(int argc, char** argv){
         if (type_str==NULL)  type=channel_info.type;
         else if (STRING_TO_UINT32(type_str)!=channel_info.type) EXIT_ON_CHANNEL_ERROR(&channel_info, "The requested type '%s' differ from the exisiting channel", type_str);
         if (keys_nb==-1)  keys_nb=channel_info.total_length;
-        else if (keys_nb!=channel_info.total_length) EXIT_ON_CHANNEL_ERROR(&channel_info, "number of keys(%d) differ from channel length (%d)", keys_nb, channel.total_length);
+        else if (keys_nb!=(int)channel_info.total_length) EXIT_ON_CHANNEL_ERROR(&channel_info, "number of keys(%d) differ from channel length (%d)", keys_nb, channel.total_length);
     }
     else {
         if (type_str) type=STRING_TO_UINT32(type_str);
@@ -301,20 +301,17 @@ int main(int argc, char** argv){
         }
     }
 
-
-
     if (memchr(key_list, quitting_key, keys_nb)) EXIT_ON_ERROR("The quitting key '%c' is in your key list %.*s, you need to select an other one with --quitting_key=...", quitting_key, keys_nb, key_list);
     if (memchr(key_list, neutral_key, keys_nb)) EXIT_ON_ERROR("The neutral key '%c' is in your key list %.*s, you need to select an other one with --neutral_key=...", neutral_key, keys_nb, key_list);
     
-    channel.create_or_open(channel_name, BLC_CHANNEL_WRITE, type, 'NDEF', 1, keys_nb);
+    created=channel.create_or_open(channel_name, BLC_CHANNEL_WRITE, type, 'NDEF', 1, keys_nb);
     
     if (filename){
         extension = blc_get_filename_extension(filename);
         if(strcmp(extension, "blc")==0)  channel.update_with_blc_file(filename);
         else if (strcmp(extension, "tsv")==0) channel.update_with_tsv_file(filename);
         else EXIT_ON_ERROR("'%s' is not a possible file type extension", extension);
-    }
-    else {
+    }else if (created){
         switch (type){
             case  'UIN8':
             FOR(i, keys_nb) channel.uchars[i]=BLC_NORMED_FLOAT_TO_UCHAR(neutral_value);
@@ -348,7 +345,7 @@ int main(int argc, char** argv){
     }
     
     table.allocate(max-min+1);
-    FOR(i, table.size){
+    FOR(i, (int)table.size){
         pos=strchr(key_list, i+min);
         if (pos) table.uchars[i]=pos-key_list;
         else table.uchars[i]=keys_nb;