uniq.c

#include "types.h"
#include "stat.h"
#include "user.h"
char buf[5120000];
char *args;
int uniq(int fd, char *name)
{
	int final=0,k,p,q,index=0,m=0,l=0,b,n,i,count=0,count1 = 0; char pilot[10000];
        char *output[10000];
	int repeat[1000];
	
 while((n = read(fd, buf, sizeof(buf))) > 0)

        {        for(b=0; b<n; b++)
		 {
                     if(buf[b] == '\n')
                          l++;
                 }
                for(i=0;buf[i]!='\n';i++)
                {
                        count++;
                         pilot[i]=buf[i];
                }
           
    	        pilot[i]='\0';
		repeat[0]=1;
                output[0]=(char*)malloc((count+1)*sizeof(char*));
                for(i=0;i<count+1;i++)
                {
                output[index][i]=pilot[i];
                }
		output[index][i]='\0';
                k=i;
        while(final<l-1)
	{
		final++;
        	count1=0;
		for(i=k;buf[i]!='\n';i++)
        	{
			count1++;
        		pilot[m++]=buf[i];
        	}
		pilot[m]='\0';
		k=k+count1+1;
		m=0;
        	if(strcmp(output[index],pilot)!=0)
		{
			index = index + 1;
			output[index]=(char*)malloc((count1+1)*sizeof(char*));
			for(p=0;p<count1;p++)
			{
                		output[index][p]=pilot[p];
			}
			output[index][p]='\0';
			repeat[index]=1;
        	}
		else
		{
			repeat[index]=repeat[index]+1;

		}
	}
	}
        if(strcmp(args,"-c")==0 || strcmp(args,"-C")==0 )
	{
		for(q=0;q<index+1;q++)
                { 
                        printf(1,"%d %s \n",repeat[q],output[q]);
                }
              }
       else  if(strcmp(args,"-d")==0 || strcmp(args,"-D")==0 )
	{
	      for(q=0;q<index+1;q++)
              {
		if(repeat[q]>1)
		{	
              		printf(1,"%s \n",output[q]);
		}
	      }	
        }
	else
	{
	     for(q=0;q<index+1;q++)
             {
             	 printf(1,"%s \n",output[q]);
              }

	}
	free(output); 
        return 0;
}
int main(int argc, char **argv)
{
  int fd, r;
  if(argc <= 1)
  {
    uniq(0, "");
    exit();
  }
  else if(argc == 2)
  {
  for(r = 1; r < argc; r++)
  {
    if((fd = open(argv[r], 0)) < 0)
    {
      printf(1,"uniq: cannot open %s\n", argv[r]);
      exit();
    }
    uniq(fd, argv[r]);
    close(fd);
  }
  exit();
  }
  else
  {
    for(r = 2; r < argc; r++)
  {
    if((fd = open(argv[r], 0)) < 0)
    {
      printf(1,"uniq: cannot open %s\n", argv[r]);
      exit();
    }
    args=argv[1];
    uniq(fd, argv[r]);
    close(fd);
  }
  exit();
  }
}