Implemented 'c' command

1 files changed, 128 insertions, 19 deletions

diff --git a/buff.c b/buff.c
index f0ef72d..96cb12f 100644
--- a/buff.c
+++ b/buff.c
@@ -14,11 +14,13 @@ int read_lines(FILE *fin){
   
   char buff[4096];
   line_t *line;
-  size_t s;
+  size_t s, tot;
 
+  tot = 0;
   while(feof(fin) == 0){
     if (!fgets(buff, 4095, fin)) break;
     s = strlen(buff) + 1;
+    tot += s-1;
     line = malloc(sizeof(line_t));
     line->s = s;
     line->c = malloc(s * sizeof(char));
@@ -38,12 +40,17 @@ int read_lines(FILE *fin){
   }
   cur = b_end;
   pos = num;
+  printf("%d\n", tot);
 }
 
+
+
+
+
 void print_cur_line(char lineno){
   
   if (!b_start){
-    printf("?\n");
+    E;
     return;
   }
   
@@ -95,10 +102,10 @@ void print_lineno(){
 int move_forward(int n){
 
   if (pos + n > num){
-    printf("?\n");
+    E;
     return -1;
   }
-  while(n-- >0){
+  while(n-- > 0){
     cur = cur->next;
   }
   pos += n;
@@ -108,7 +115,7 @@ int move_forward(int n){
 int move_backward(int n){
 
   if (pos - n < 1){
-    printf("?\n");
+    E;
     return -1;
   }
   while(n-- >0){
@@ -118,17 +125,14 @@ int move_backward(int n){
   return 0;
 }
 
-
-
-/* add lines after pos */
-void append_lines(){
+int __get_lines(line_t **first, line_t **last){
 
   char buff[4096];
   int n,s;
-  line_t *first, *l, *last;
+  line_t *l;
   
   n = 0;
-  first = last = NULL;
+  *first = *last = NULL;
   while(feof(stdin) == 0){
     if (!fgets(buff, 4095, stdin)) break;
     if (buff[0] == '.')
@@ -138,29 +142,134 @@ void append_lines(){
     l->c = malloc(s * sizeof(char));
     memcpy(l->c, buff, s);
     l->s = s;
-    if (first == NULL)
-      first = last = l;
+    if (*first == NULL)
+      *first = *last = l;
     else{
-      last -> next = l;
-      l->prev = last;
-      last = l;
+      (*last) -> next = l;
+      l->prev = *last;
+      *last = l;
     }
     n += 1;
   }
+  return n;
+}
+
+
+/* add lines after pos */
+void append_lines(){
+
+  int n;
+  line_t *first, *last;
+
+  first = last = NULL;
+  n = __get_lines(&first, &last);
+  
   if (addr1 == 0){
+    fprintf(stderr, "  >>> append (zero): pos: %d n:%d\n", pos, n);
     last->next = b_start;
     b_start -> prev = last;
     b_start = first;
+    num += n;
     move_to_line(n,0);
   }
   else{
+    fprintf(stderr, "  >>> append (non-zero): pos: %d n:%d\n", pos, n);
     last -> next = cur -> next;
     cur->next = first;
     first->prev = cur;
-    move_forward(n);
+    num += n;
+    //move_forward(n);
+    pos += n;
+    cur = last;
+  }
+}
+
+void insert_lines(){
+
+  int n;
+  line_t *first, *last;
+
+  first = last = NULL;
+  n = __get_lines(&first, &last);
+
+  if (addr1 == 0){
+    fprintf(stderr, "  >>> insert (zero): pos: %d n:%d\n", pos, n);
+    last->next = b_start;
+    b_start -> prev = last;
+    b_start = first;
+    num += n;
+    move_to_line(n,0);
+  }
+  else{
+    fprintf(stderr, "  >>> insert (non-zero): pos: %d n:%d\n", pos, n);
+    
+    cur -> prev -> next = first;
+    first -> prev = cur -> prev;
+    last -> next = cur;
+    num += n;
+    pos -=1 ;
+    cur = last;
   }
 }
 
-void insert_lines(){}
 
-void delete_lines(){}
+void delete_lines(){
+
+  line_t *handle;
+  
+  if (addr1 == -1){
+    addr1 = pos;
+  }
+  if (addr2 == -1){
+    addr2 = addr1;
+  }
+
+  fprintf(stderr, "    >>> delete: addr1: %d addr2: %d\n", addr1, addr2);
+  
+  move_to_line(addr2,0);
+
+  if (addr2 <= 1){ /* we are deleting the first line */
+    while(pos <= addr1){
+      free(cur->c);
+      cur = cur -> next;
+      if (cur)
+        free(cur -> prev);
+      pos ++;
+    }
+    b_start = cur;
+    if (cur){
+      pos = 1;
+      cur = b_start;
+    }
+    else
+      pos = 0;
+  }
+  else{
+    handle = cur->prev;
+    while(pos < addr1){
+      free(cur->c);
+      cur = cur -> next;
+      free(cur->prev);
+      pos ++;
+    }
+    handle->next = cur -> next;
+    free(cur->c);
+    free(cur);
+    if (handle -> next){
+      pos = addr2 ;
+      cur = handle->next;
+    }
+    else{
+      pos = addr2 - 1;
+      cur = handle;
+    }
+  }
+  num -= addr1 - addr2 + 1;  
+}
+
+
+void change_lines(){
+  delete_lines();
+  addr2 = addr1 =pos;
+  append_lines();
+}