diff options
| -rw-r--r-- | page.c | 33 |
1 files changed, 15 insertions, 18 deletions
@@ -58,25 +58,23 @@ struct page *new_page() { return result; } -static inline void set_half_page_gap(struct page *page) { - page->gap_start = PAGE_SIZE / 2; - page->gap_end = PAGE_SIZE; -} +void split_page(struct page *front) { + struct page *back = new_page(); -void split_page(struct page *first_half) { - struct page *second_half = new_page(); + memcpy(back->buffer, front->buffer, PAGE_SIZE / 2); - memcpy(second_half->buffer, first_half->buffer + PAGE_SIZE / 2, PAGE_SIZE / 2 - 1); + front->gap_start = 0; + front->gap_end = PAGE_SIZE / 2; - set_half_page_gap(first_half); - set_half_page_gap(second_half); + back->gap_start = PAGE_SIZE / 2; + back->gap_end = PAGE_SIZE; - if (first_half->next) { - first_half->next->prev = second_half; + if (front->prev) { + front->prev->next = back; } - second_half->next = first_half->next; - second_half->prev = first_half; - first_half->next = second_half; + back->prev = front->prev; + back->next = front; + front->prev = back; } void free_page(struct page **page) { @@ -117,16 +115,15 @@ void insert_at_point(struct point *point, uint8_t c) { struct page *page = point->current_page; if (page->gap_start == page->gap_end) { split_page(page); - if (point->index >= PAGE_SIZE / 2) { - point->current_page = point->current_page->next; - point->index -= PAGE_SIZE / 2; + if (point->index < PAGE_SIZE / 2) { + point->current_page = point->current_page->prev; page = point->current_page; } } move_gap(page, point->index); page->buffer[page->gap_start] = c; page->gap_start++; - move_point_forward(point); + page->element_count++; } void delete_from_page(struct page *page) { |