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tetex-bin  3.0
Functions
lib_newwin.c File Reference
#include <curses.priv.h>

Go to the source code of this file.

Functions

static WINDOWremove_window_from_screen (WINDOW *win)
 _nc_freewin (WINDOW *win)
 newwin (int num_lines, int num_columns, int begy, int begx)
 derwin (WINDOW *orig, int num_lines, int num_columns, int begy, int begx)
 subwin (WINDOW *w, int l, int c, int y, int x)
static bool dimension_limit (int value)
 _nc_makenew (int num_lines, int num_columns, int begy, int begx, int flags)

Function Documentation

_nc_freewin ( WINDOW win)

Definition at line 75 of file lib_newwin.c.

{
    WINDOWLIST *p, *q;
    int i;
    int result = ERR;

    if (win != 0) {
       for (p = _nc_windows, q = 0; p != 0; q = p, p = p->next) {
           if (&(p->win) == win) {
              remove_window_from_screen(win);
              if (q == 0)
                  _nc_windows = p->next;
              else
                  q->next = p->next;

              if (!(win->_flags & _SUBWIN)) {
                  for (i = 0; i <= win->_maxy; i++)
                     FreeIfNeeded(win->_line[i].text);
              }
              free(win->_line);
              free(p);

              result = OK;
              T(("...deleted win=%p", win));
              break;
           }
       }
    }
    return result;
}

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_nc_makenew ( int  num_lines,
int  num_columns,
int  begy,
int  begx,
int  flags 
)

Definition at line 203 of file lib_newwin.c.

{
    int i;
    WINDOWLIST *wp;
    WINDOW *win;
    bool is_pad = (flags & _ISPAD);

    T(("_nc_makenew(%d,%d,%d,%d)", num_lines, num_columns, begy, begx));

    if (!dimension_limit(num_lines) || !dimension_limit(num_columns))
       return 0;

    if ((wp = typeCalloc(WINDOWLIST, 1)) == 0)
       return 0;

    win = &(wp->win);

    if ((win->_line = typeCalloc(struct ldat, ((unsigned) num_lines))) == 0) {
       free(win);
       return 0;
    }

    win->_curx = 0;
    win->_cury = 0;
    win->_maxy = num_lines - 1;
    win->_maxx = num_columns - 1;
    win->_begy = begy;
    win->_begx = begx;
    win->_yoffset = SP->_topstolen;

    win->_flags = flags;
    win->_attrs = A_NORMAL;
    SetChar(win->_nc_bkgd, BLANK_TEXT, BLANK_ATTR);

    win->_clear = is_pad ? FALSE : (num_lines == screen_lines
                                && num_columns == screen_columns);
    win->_idlok = FALSE;
    win->_idcok = TRUE;
    win->_scroll = FALSE;
    win->_leaveok = FALSE;
    win->_use_keypad = FALSE;
    win->_delay = -1;
    win->_immed = FALSE;
    win->_sync = 0;
    win->_parx = -1;
    win->_pary = -1;
    win->_parent = 0;

    win->_regtop = 0;
    win->_regbottom = num_lines - 1;

    win->_pad._pad_y = -1;
    win->_pad._pad_x = -1;
    win->_pad._pad_top = -1;
    win->_pad._pad_bottom = -1;
    win->_pad._pad_left = -1;
    win->_pad._pad_right = -1;

    for (i = 0; i < num_lines; i++) {
       /*
        * This used to do
        *
        * win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE;
        *
        * which marks the whole window unchanged.  That's how
        * SVr1 curses did it, but SVr4 curses marks the whole new
        * window changed.
        *
        * With the old SVr1-like code, say you have stdscr full of
        * characters, then create a new window with newwin(),
        * then do a printw(win, "foo        ");, the trailing spaces are
        * completely ignored by the following refreshes.  So, you
        * get "foojunkjunk" on the screen instead of "foo        " as
        * you actually intended.
        *
        * SVr4 doesn't do this.  Instead the spaces are actually written.
        * So that's how we want ncurses to behave.
        */
       win->_line[i].firstchar = 0;
       win->_line[i].lastchar = num_columns - 1;

       if_USE_SCROLL_HINTS(win->_line[i].oldindex = i);
    }

    if (!is_pad && (begx + num_columns == screen_columns)) {
       win->_flags |= _ENDLINE;

       if (begx == 0 && num_lines == screen_lines && begy == 0)
           win->_flags |= _FULLWIN;

       if (begy + num_lines == screen_lines)
           win->_flags |= _SCROLLWIN;
    }

    wp->next = _nc_windows;
    _nc_windows = wp;

    T((T_CREATE("window %p"), win));

    return (win);
}

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derwin ( WINDOW orig,
int  num_lines,
int  num_columns,
int  begy,
int  begx 
)

Definition at line 142 of file lib_newwin.c.

{
    WINDOW *win;
    int i;
    int flags = _SUBWIN;

    T((T_CALLED("derwin(%p,%d,%d,%d,%d)"), orig, num_lines, num_columns,
       begy, begx));

    /*
     * make sure window fits inside the original one
     */
    if (begy < 0 || begx < 0 || orig == 0 || num_lines < 0 || num_columns < 0)
       returnWin(0);
    if (begy + num_lines > orig->_maxy + 1
       || begx + num_columns > orig->_maxx + 1)
       returnWin(0);

    if (num_lines == 0)
       num_lines = orig->_maxy + 1 - begy;

    if (num_columns == 0)
       num_columns = orig->_maxx + 1 - begx;

    if (orig->_flags & _ISPAD)
       flags |= _ISPAD;

    if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy,
                        orig->_begx + begx, flags)) == 0)
       returnWin(0);

    win->_pary = begy;
    win->_parx = begx;
    win->_attrs = orig->_attrs;
    win->_nc_bkgd = orig->_nc_bkgd;

    for (i = 0; i < num_lines; i++)
       win->_line[i].text = &orig->_line[begy++].text[begx];

    win->_parent = orig;

    returnWin(win);
}

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static bool dimension_limit ( int  value) [static]

Definition at line 196 of file lib_newwin.c.

{
    NCURSES_SIZE_T test = value;
    return (test == value && value > 0);
}

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newwin ( int  num_lines,
int  num_columns,
int  begy,
int  begx 
)

Definition at line 107 of file lib_newwin.c.

{
    WINDOW *win;
    NCURSES_CH_T *ptr;
    int i;

    T((T_CALLED("newwin(%d,%d,%d,%d)"), num_lines, num_columns, begy, begx));

    if (begy < 0 || begx < 0 || num_lines < 0 || num_columns < 0)
       returnWin(0);

    if (num_lines == 0)
       num_lines = SP->_lines_avail - begy;
    if (num_columns == 0)
       num_columns = screen_columns - begx;

    if ((win = _nc_makenew(num_lines, num_columns, begy, begx, 0)) == 0)
       returnWin(0);

    for (i = 0; i < num_lines; i++) {
       win->_line[i].text = typeCalloc(NCURSES_CH_T, (unsigned) num_columns);
       if (win->_line[i].text == 0) {
           (void) _nc_freewin(win);
           returnWin(0);
       }
       for (ptr = win->_line[i].text;
            ptr < win->_line[i].text + num_columns;
            ptr++)
           SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
    }

    returnWin(win);
}

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static WINDOW* remove_window_from_screen ( WINDOW win) [static]

Definition at line 46 of file lib_newwin.c.

{
    SCREEN **scan = &_nc_screen_chain;

    while (*scan) {
       SCREEN *sp = *scan;
       if (sp->_curscr == win) {
           sp->_curscr = 0;
           if (win == curscr)
              curscr = 0;
       } else if (sp->_stdscr == win) {
           sp->_stdscr = 0;
           if (win == stdscr)
              stdscr = 0;
       } else if (sp->_newscr == win) {
           sp->_newscr = 0;
           if (win == newscr)
              newscr = 0;
       } else {
           scan = &(*scan)->_next_screen;
           continue;
       }
       break;
    }

    return 0;
}

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subwin ( WINDOW w,
int  l,
int  c,
int  y,
int  x 
)

Definition at line 187 of file lib_newwin.c.

{
    T((T_CALLED("subwin(%p, %d, %d, %d, %d)"), w, l, c, y, x));
    T(("parent has begy = %d, begx = %d", w->_begy, w->_begx));

    returnWin(derwin(w, l, c, y - w->_begy, x - w->_begx));
}

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