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Rev 1289 Rev 1292
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    *uidirtyto = 0xff;
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    *uidirtyto = 0xff;
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  }
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  }
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}
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}
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static void del(struct linedb *db, unsigned char cursorposx, unsigned char cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
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  if (cursorposx + db->xoffset < db->cursor->len) {
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    _fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);
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    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
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    *uidirtyfrom = cursorposy;
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    *uidirtyto = cursorposy;
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  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
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    struct line far *nextline = db->cursor->next;
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    if (db->cursor->next->len > 0) {
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      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
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      if (newptr != NULL) {
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        db->cursor = newptr;
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        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
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        db->cursor->len += db->cursor->next->len;
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        /* update db->topscreen if needed */
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        if (cursorposy == 0) db->topscreen = db->cursor;
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      }
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    }
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    db->cursor->next = db->cursor->next->next;
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    db->cursor->next->prev = db->cursor;
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    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
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    _ffree(nextline);
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    *uidirtyfrom = cursorposy;
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    *uidirtyto = 0xff;
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  }
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}
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/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
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/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
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 * of argc and argv, saves some 330 bytes of binary size */
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 * of argc and argv, saves some 330 bytes of binary size */
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static char *parseargv(void) {
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static char *parseargv(void) {
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  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
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  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
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  unsigned char count = 0;
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  unsigned char count = 0;
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        uidirtyto = 0xff;
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        uidirtyto = 0xff;
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      } else {
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      } else {
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        /* ERROR: OUT OF MEMORY */
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        /* ERROR: OUT OF MEMORY */
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      }
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      }
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    } else if (k == 0x153) {  /* DEL */
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      del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);
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    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
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    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
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      char buff[4];
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      char buff[4];
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      const char *HEX = "0123456789ABCDEF";
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      const char *HEX = "0123456789ABCDEF";
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      buff[0] = HEX[(k >> 8) & 15];
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      buff[0] = HEX[(k >> 8) & 15];
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      buff[1] = HEX[(k >> 4) & 15];
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      buff[1] = HEX[(k >> 4) & 15];