My cat program with low level

cat2.c

/*
 * =====================================================================================
 *
 *       Filename:  cat2.c
 *
 *    Description:  My cat program with low level
 *
 *        Version:  1.0
 *        Created:  25-04-2013 17:01:46
 *       Compiler:  gcc
 *
 *         Author:  Halit Alptekin, info@halitalptekin.com
 *
 * =====================================================================================
 */

#include <syscall.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>

void error(char *fmt, ...);
int main(int argc, char *argv[])
{
    int fd;
    char *fname = argv[0];
    void copyFile(int, int);

    if(argc == 1){
        copyFile(0, 1);
    }else{
        while(--argc > 1){
            if((fd = open(*++argv, O_RDONLY)) == -1){
                error("%s: dosya acilamadi %s\n", fname, *argv);
            }else{
                copyFile(fd, 1);
                close(fd);
            }
        }
    }
    return 0;
}

void copyFile(int ifd, int ofd){
    int n;
    char buffer[BUFSIZ];

    while((n = read(ifd, buffer, BUFSIZ)) > 0)
        if(write(ofd, buffer, n) != n)
            error("yazma hatasi\n");

}