#include <stdio.h>
int main(int argc, char ** argv)
{
    int i;
    for (i=0; i < argc; i++)
    printf("Argument %d is %s.\n", i, argv[i]);
    return 0;
    
}

stdio.h

FILE *f;
long i,n,off;
f=fopen("a.bin","rb+");
fseek(f,0,SEEK_END);
off=ftell(f)+1L;
n=128*1024-off;
if (n>0) {
for (i=0;i<n;i++) fputc('\xff',f);
}
fclose(f);