Convert CSV to Binary converter

csv_to_bin.c

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

typedef struct {
    double t;
    double x;
    double y;
    double z;
    int prank;
    char etype[5];
    int uidx;
    int eidx;
    double data[5];
} data_t;

int main (int argc, char **argv)
{
    if(argc<3)
    {
        printf("Usage %s <inp-file> <out-file>\n",argv[0]);
        exit(1);
    }
    FILE *fin=fopen(argv[1],"r");
    FILE *fout=fopen(argv[2],"wb");

    char *line=NULL;
    data_t data;
    memset(&data,0,sizeof(data_t));
    double old_t=-1;
    while(!feof(fin))
    {
        long unsigned int count;
        int nf_ref=-1, nf=0;

        getline(&line, &count, fin);
        for(int i=0; i<count; i++)if(line[i]==',') nf++;
        if(nf_ref>0)
        {
            if(nf!=nf_ref)
            {
                printf("SKIPPING\n");
                continue;
            }
        }
        else
        {
            nf_ref = nf;
        }
        fflush(stdout);

        sscanf(line,"%lf,%lf,%lf,%lf,%d,%4[^,],%d,%d,%lf,%lf,%lf,%lf,%lf",
               &data.t, &data.x, &data.y, &data.z,
               &data.prank, &data.etype, &data.uidx, &data.eidx,
               &data.data[0], &data.data[1], &data.data[2], &data.data[3], &data.data[4]);
        fwrite(&data,sizeof(data),1,fout);
        if(fabs(old_t-data.t)>1e-10)
        {
            printf("%.11lf\n",data.t);
            old_t = data.t;
            fflush(stdout);
        }
    }

    if(line)
        free(line);

    fclose(fin);
    fclose(fout);
    exit(EXIT_SUCCESS);
}