what could cause seg fault in this code?

[vince3214]

I'm designing a program for appending a few lines at certain line from a file.
the procedure is read from a file & store the lines into a link list, append at certain line then write it to result.txt.
However, my firstline is not working properly.

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




typedef struct Node {
     char   line[100];
     struct Node *next;
} NodeT;

NodeT *makeNode(char *);
int Append(char *,int);

int main(int argc, char **argv) {
   NodeT *head;
   NodeT *cur;
   NodeT *new;
   NodeT *inputhead;
   NodeT *inputcur;
   NodeT *inputnew;
   NodeT *tmp;
   NodeT *tmp1;
   FILE *fp,*fpo;
   int linenum;
   char line[100];
   int i = 1;

   linenum = atoi(argv[1]);
   fp = fopen(argv[2],"r");
  
   while(fgets(line,100,fp) != NULL) {
      if(i == 1){      
         head = makeNode(line);
         head = cur;
         printf("%s",head->line);//shouldn't they print out the same things??
         printf("%s",line);
      }
      else{
         new = makeNode(line);
         cur->next = new;
         cur = cur->next;
      }
      
      i++;
   }
   i = 1;
   fclose(fp);
   while(1) {
      
      fgets(line,100,stdin);
      if(line[0] == '.') break;
      if(i == 1){
         inputhead = makeNode(line);
         inputcur = inputhead;
      }
      else{
         inputnew = makeNode(line);
         inputcur->next = inputnew;
         inputcur = inputnew;
      }
   }
   i = 1;
   cur = head; 
   while(i < linenum){
      tmp = cur;
      cur = cur->next;
      i++;
   }
   tmp->next = inputhead;
   inputcur->next = cur;
   tmp1 = head;
   fpo = fopen("result.txt","w+");


   while(tmp1 != NULL){
      fprintf(fpo,"%s",tmp1->line);
      tmp1 = tmp1->next;
   }


   return 0;
}




NodeT *makeNode(char *line) {
   NodeT *new;
   new = malloc(sizeof(NodeT));
   if (new == NULL) {
     
     exit(1); 
   }
   strcpy(new->line,line);
   new->next = NULL;
   return new;
}

[vince3214]

sry is not causing seg fault any more... just print some random stuff in the first line of my result.txt

[tabstop]

head = makeNode(line);  /* makes a new node and sets it at the head */
         head = cur; /* completely destroys the linked list */

[vince3214]

omg....thx... stupid mistake...lol