implementation of LN command using system calls

this program implement the ln command in unix using system calls.

Code:-

#include<stdio.h>
#include<fcntl.h>
#include<unistd.h>
#include<sys/stat.h>
int main(int argc,char* argv[])
{
int i;
struct stat s;
if (argc<3)
{
 perror("ERROR:Too Few Arguments");
 exit(1);
}
if(argc>4)
{
 perror("ERROR:Too Many Arguments");
 exit(1);
}
if(argc==3)
 i=0;
else
 i=1;

if(i && !(strcmp(argv[1],"-s")==0)) {
 perror("ERROR:Invalid Syntax");
 exit(1);
}

if(access(argv[i+1],F_OK))
{
  perror("ERROR:File name not Found");
  exit(1);
}
if(!access(argv[i+2],F_OK))
{
  perror("ERROR:File Name already exist");
  exit(1);
}
if(stat(argv[i+1],&s)<0)
{
  perror("ERROR:Unable to reterive stat information");
  exit(1);
}
if(!S_ISREG(s.st_mode))
{
  perror("ERROR:Not a Regular File");
  exit(1); }
if(argc==3)
 if(link(argv[i+1],argv[i+2])<0)
 {
  perror("ERROR:Unable to create the Link");
  exit(1);
 }
if(argc==4)
 if(symlink(argv[i+1],argv[i+2])<0)
 {
  perror("ERROR:Unable to create the Link");
  exit(1);
 }
}