Generating G Code from MDI history log

/*
Component for use with the splice utility to produce gcode from
a set of co-ordinates marked with pyVCP button
*/

component plot;

pin in float xposition              "Receives current position from Xpos";
pin in float yposition              "Receives current position from Ypos";
pin in float zposition              "Receives current position from Zpos";

pin in bit trigger = 0              "Triggers writing co-ordinates to file";

pin out float lastx                 "Outputs last X position plotted";
pin out float lasty                 "Outputs last Y position plotted";
pin out float lastz                 "Outputs last Z position plotted";

pin in bit splice = 0               "Triggers splicing together gcode";

pin in bit load = 0                 "Triggers loading of generated gcode";

option singleton yes;               
option userspace yes;

author "ArcEye";
license "GPL";
;;

#include <stdio.h>    /* Standard input/output definitions */
#include <stdlib.h> 
#include <stdint.h>   /* Standard types */
#include <string.h>   /* String function definitions */
#include <unistd.h>   /* UNIX standard function definitions */
#include <errno.h>    /* Error number definitions */
#include <signal.h>
int done = 0;


void adios(int sig)
{
    done = 1;
}


void user_mainloop(void)
{
char coordfile[] = "/tmp/cords.txt";
FILE *fptr1;
int triggered, spliced, loaded;

    signal(SIGINT, adios);
    signal(SIGTERM, adios);
    
    // prevent cycling whilst button depressed 
    triggered = spliced = loaded = 0;
     
    while(!done)
        {
        usleep(100000);
        
        FOR_ALL_INSTS()  
            { 
            if(trigger && !triggered)
                {
                fptr1 = fopen(coordfile, "a");
                fprintf(fptr1, "X%08.03f Y%08.03f Z%08.03f\n", lastx = xposition, lasty = yposition, lastz = zposition ); 
                fclose(fptr1);
                triggered = 1;
                }
            else if(splice && !spliced)
                {
                system("splice /usr/share/splice/header.ngc /usr/share/splice/footer.ngc /tmp/cords.txt /tmp/operation.ngc /tmp/output.ngc");
                spliced = 1;
                }
            else if(load && !loaded)
                {
                system("axis-remote /tmp/output.ngc");
                loaded = 1;
                }
            else // ensure button released before zeroing flag to allow pressing it to register again
                {
                if(!trigger && triggered) triggered = 0;
                if(!splice && spliced) spliced = 0;
                if(!load && loaded) loaded = 0;
                }
            }           
        }

    exit(0);
}