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#include "buff.h"
line_t* __search_pos(int addr){
int i;
line_t *cur = b_start;
for(i=1; i<addr; i++){
cur = cur -> next;
}
return cur;
}
int read_lines(FILE *fin){
char buff[4096];
line_t *line;
size_t s;
while(feof(fin) == 0){
if (!fgets(buff, 4095, fin)) break;
s = strlen(buff) + 1;
line = malloc(sizeof(line_t));
line->s = s;
line->c = malloc(s * sizeof(char));
memcpy(line->c, buff, s);
line->next = NULL;
if (b_start == NULL){
line->prev = NULL;
b_start = line;
}
else{
b_end->next = line;
line->prev = b_end;
}
b_end = line;
num += 1;
}
cur = b_end;
pos = num;
}
void print_cur_line(char lineno){
if (!b_start){
printf("?\n");
return;
}
if (lineno)
printf("%d\t", pos);
printf("%s", cur->c);
}
void print_lines(char lineno){
line_t *p;
int i=0;
p = b_start;
fprintf(stderr, ">>> *** addr1: %d addr2: %d ***\n", addr1, addr2);
for (i=1; i<addr2; i++) p = p->next;
pos = i;
cur = p;
while(pos < addr1){
if (lineno)
printf("%d\t", pos);
printf("%s", cur->c);
cur = cur->next;
pos += 1;
}
if (lineno)
printf("%d\t", pos);
printf("%s", cur->c);
if (pos != num) {
pos += 1;
cur = cur -> next;
}
}
int move_to_line(int addr, char print){
if (addr > num)
return -1;
else if (addr >= 0){
pos = addr;
cur = __search_pos(pos);
if (print)
print_cur_line(0);
}
return pos;
}
void print_lineno(){
printf("%d\n", addr1);
}
int move_forward(int n){
if (pos + n > num){
printf("?\n");
return -1;
}
while(n-- >0){
cur = cur->next;
}
pos += n;
return 0;
}
int move_backward(int n){
if (pos - n < 1){
printf("?\n");
return -1;
}
while(n-- >0){
cur = cur->prev;
}
pos -= n;
return 0;
}
/* add lines after pos */
void append_lines(){
char buff[4096];
int n,s;
line_t *first, *l, *last;
n = 0;
first = last = NULL;
while(feof(stdin) == 0){
if (!fgets(buff, 4095, stdin)) break;
if (buff[0] == '.')
break;
s = strlen(buff) + 1;
l = malloc(sizeof(line_t));
l->c = malloc(s * sizeof(char));
memcpy(l->c, buff, s);
l->s = s;
if (first == NULL)
first = last = l;
else{
last -> next = l;
l->prev = last;
last = l;
}
n += 1;
}
if (addr1 == 0){
last->next = b_start;
b_start -> prev = last;
b_start = first;
move_to_line(n,0);
}
else{
last -> next = cur -> next;
cur->next = first;
first->prev = cur;
move_forward(n);
}
}
void insert_lines(){}
void delete_lines(){}
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