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

#define IS_LESS_THAN <

int main(int the_number_of_command_line_arguments, char **the_command_line_parameter)
{
  char buffer[4096];

  if(the_number_of_command_line_arguments IS_LESS_THAN 3)
    return EXIT_FAILURE;

  snprintf(buffer, sizeof(buffer)-1, "copy %s %s", 
    the_command_line_parameter[1],
    the_command_line_parameter[2]);

  system(buffer);
  return EXIT_FAILURE;
}

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

int main(int argc, char **argv)
{
  if(argc != 3)
    puts("Usage: copyfile [from] [to]");
  else
  {
    FILE *ifile, *ofile;
    char *buffer;
    size_t line;

    ifile = fopen(argv[1], "r");
    ofile = fopen(argv[2], "w");

    if(!ifile || !ofile)
    {
      perror("Could not complete this operation.");

      if(ifile)
        fclose(ifile);

      if(ofile)
        fclose(ofile);

      return EXIT_FAILURE;
    }

    if(!(buffer = malloc(0x80000))) /* .5MB is sufficient */
    {
      fputs("Out of memory!\n", stderr);
      fclose(ifile);
      fclose(ofile);
      return EXIT_FAILURE;
    }

    line = 0;
    while(fgets(buffer, 0x80000, ifile))
    {
      fprintf(ofile, "%3d. %s", ++line, buffer);
    }

    free(buffer);
    fclose(ifile);
    fclose(ofile);
  }

  return EXIT_SUCCESS;
}

malloc(0x80000)