Handling large files

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

char linebuffer[200] = "firstline";
int i;


//int main(int argc, char *argv[]){

FILE *file_write=fopen("log.txt", "w");
file_write=fopen("log.txt", "w");  

//Yourhal_line = linebuffer;
fprintf(file_write,"\n%d\t%s ", i, linebuffer);
i++;

fclose(file_write);	

//}

loadrt sampler depth=10000 cfg=b
addf sampler.0 servo-thread
setp sampler.0.enable 0

net 1-is-homed sampler.0.pin.0

$ halcmd setp sampler.0.enable 1
$ halsampler -t out

#sampler x,y,z,torch volts,thcad-volts,velocity
loadrt sampler depth=10000 cfg=ffffff
addf sampler.0                servo-thread 
net THCAD-volts-in  <= sampler.0.pin.4 <= thcad10.thcad-volts
net curvolt <= sampler.0.pin.3 <= thcad10.torch-volts
net ArcOK   <= sampler.0.enable <= hm2_7i76e.0.7i76.0.0.input-10
net sample0 sampler.0.pin.0 <= axis.x.pos-cmd
net sample1 sampler.0.pin.1 <= axis.y.pos-cmd