| 137,12 → 137,30 |
|---|
| |
| static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw) { |
| /* adjust xoffset to make sure eol is visible on screen */ |
| if (db->xoffset >= db->cursor->len) db->xoffset = db->cursor->len - 1; |
| if (db->xoffset > db->cursor->len) db->xoffset = db->cursor->len - 1; |
| if (db->xoffset + screenw - 1 <= db->cursor->len) db->xoffset = db->cursor->len - screenw + 2; |
| *cursorposx = db->cursor->len - db->xoffset; |
| } |
| |
| |
| static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh) { |
| if (db->cursor->next != NULL) { |
| db->cursor = db->cursor->next; |
| if (*cursorposy < screenh - 2) { |
| *cursorposy += 1; |
| } else { |
| db->topscreen = db->topscreen->next; |
| } |
| } |
| } |
| |
| |
| static void cursor_home(struct linedb *db, unsigned char *cursorposx) { |
| *cursorposx = 0; |
| db->xoffset = 0; |
| } |
| |
| |
| int main(int argc, char **argv) { |
| FILE *fd; |
| const char *fname = NULL; |
| 193,14 → 211,7 |
|---|
| |
| k = keyb_getkey(); |
| if (k == 0x150) { /* down */ |
| if (db.cursor->next != NULL) { |
| db.cursor = db.cursor->next; |
| if (cursorposy < screenh - 2) { |
| cursorposy++; |
| } else { |
| db.topscreen = db.topscreen->next; |
| } |
| } |
| cursor_down(&db, &cursorposy, screenh); |
| |
| } else if (k == 0x148) { /* up */ |
| cursor_up(&db, &cursorposy); |
| 212,6 → 223,9 |
|---|
| } else { |
| db.xoffset++; |
| } |
| } else { |
| cursor_down(&db, &cursorposy, screenh); |
| cursor_home(&db, &cursorposx); |
| } |
| |
| } else if (k == 0x14B) { /* left */ |
| 219,7 → 233,7 |
|---|
| cursorposx--; |
| } else if (db.xoffset > 0) { |
| db.xoffset--; |
| } else { |
| } else if (db.cursor->prev != NULL) { /* jump to end of line above */ |
| cursor_up(&db, &cursorposy); |
| cursor_eol(&db, &cursorposx, screenw); |
| } |