Add function to display channel in terminal

o_display/CMakeLists.txt

+# Set the minimum version of cmake required to build this project
+cmake_minimum_required(VERSION 2.6)
+
+# Set the name of the project as the directory basename
+project(o_display)
+
+find_package(blc_channel)
+find_package(blc_program)
+
+add_definitions(${BL_DEFINITIONS} -std=c++11)
+include_directories(${BL_INCLUDE_DIRS})
+add_executable(o_display o_display.cpp)
+target_link_libraries(o_display ${BL_LIBRARIES})
+
+
+
+

o_display/o_display.cpp

+//
+//  Created by Arnaud Blanchard on 22/12/15.
+//  Copyright ETIS 2015. All rights reserved.
+//
+#include "blc_core.h"
+#include "blc_channel.h"
+#include "blc_program.h"
+#include <unistd.h>
+#include <math.h>
+
+
+int columns_nb=64;
+int rows_nb=16;
+
+
+int main(int argc, char **argv){
+    blc_channel input;
+
+    char const  *channel_name, *period_str;
+    int  period;
+    
+    blc_program_add_parameter(&channel_name, "blc_channel-in", 1, "channel name", NULL);
+    blc_program_add_option(&period_str, 'p', "period", "integer ", "refresh period in ms", "100"); //-2 executes one and wait for return
+    blc_program_init(&argc, &argv, blc_quit);
+    
+ //   period=strtol(period_str, NULL, 10);
+    SSCANF(1, period_str, "%d", &period);
+    period*=1000; //convert ms
+    input.open(channel_name, BLC_CHANNEL_READ);
+
+    blc_loop_try_add_waiting_semaphore(input.sem_new_data);
+    blc_loop_try_add_posting_semaphore(input.sem_ack_data);
+    
+    BLC_COMMAND_LOOP(period){
+        
+        if (blc_loop_iteration) blc_eprint_cursor_down(rows_nb);
+        input.fprint_tsv(stderr);
+    }
+    
+
+return EXIT_SUCCESS;
+}