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/***************************************************************************
* COPYRIGHT NOTICE *
****************************************************************************
* ncurses is copyright (C) 1992-1995 *
* Zeyd M. Ben-Halim *
* zmbenhal@netcom.com *
* Eric S. Raymond *
* esr@snark.thyrsus.com *
* *
* Permission is hereby granted to reproduce and distribute ncurses *
* by any means and for any fee, whether alone or as part of a *
* larger distribution, in source or in binary form, PROVIDED *
* this notice is included with any such distribution, and is not *
* removed from any of its header files. Mention of ncurses in any *
* applications linked with it is highly appreciated. *
* *
* ncurses comes AS IS with no warranty, implied or expressed. *
* *
***************************************************************************/
/*
** lib_newwin.c
**
** The routines newwin(), subwin() and their dependent
**
*/
#include "curses.priv.h"
#include <stdlib.h>
WINDOW * newwin(int num_lines, int num_columns, int begy, int begx)
{
WINDOW *win;
chtype *ptr;
int i, j;
T(("newwin(%d,%d,%d,%d) called", num_lines, num_columns, begy, begx));
if (num_lines == 0)
num_lines = screen_lines - begy;
if (num_columns == 0)
num_columns = screen_columns - begx;
if (num_columns + begx > SP->_columns || num_lines + begy > SP->_lines)
return NULL;
if ((win = _nc_makenew(num_lines, num_columns, begy, begx)) == NULL)
return NULL;
for (i = 0; i < num_lines; i++) {
if ((win->_line[i].text = (chtype *) calloc((unsigned)num_columns, sizeof(chtype))) == NULL) {
for (j = 0; j < i; j++)
free(win->_line[j].text);
free(win->_line);
free(win);
return NULL;
}
else
for (ptr = win->_line[i].text; ptr < win->_line[i].text + num_columns; )
*ptr++ = ' ';
}
T(("newwin: returned window is %p", win));
return(win);
}
WINDOW * derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx)
{
WINDOW *win;
int i;
T(("derwin(%p, %d,%d,%d,%d) called", orig, num_lines, num_columns, begy, begx));
/*
** make sure window fits inside the original one
*/
if ( begy < 0 || begx < 0)
return NULL;
if ( begy + num_lines > orig->_maxy + 1
|| begx + num_columns > orig->_maxx + 1)
return NULL;
if (num_lines == 0)
num_lines = orig->_maxy - begy;
if (num_columns == 0)
num_columns = orig->_maxx - begx;
if ((win = _nc_makenew(num_lines, num_columns, orig->_begy + begy, orig->_begx + begx)) == NULL)
return NULL;
win->_pary = begy;
win->_parx = begx;
win->_attrs = orig->_attrs;
win->_bkgd = orig->_bkgd;
for (i = 0; i < num_lines; i++)
win->_line[i].text = &orig->_line[begy++].text[begx];
win->_flags = _SUBWIN;
win->_parent = orig;
T(("derwin: returned window is %p", win));
return(win);
}
WINDOW *subwin(WINDOW *w, int l, int c, int y, int x)
{
T(("subwin(%p, %d, %d, %d, %d) called", w, l, c, y, x));
T(("parent has begy = %d, begx = %d", w->_begy, w->_begx));
return derwin(w, l, c, y - w->_begy, x - w->_begx);
}
WINDOW *
_nc_makenew(int num_lines, int num_columns, int begy, int begx)
{
int i;
WINDOW *win;
T(("_nc_makenew(%d,%d,%d,%d)", num_lines, num_columns, begy, begx));
if (num_lines <= 0 || num_columns <= 0)
return NULL;
if ((win = (WINDOW *) calloc(1, sizeof(WINDOW))) == NULL)
return NULL;
if ((win->_line = (struct ldat *) calloc((unsigned)num_lines, sizeof (struct ldat))) == NULL) {
free(win);
return NULL;
}
win->_curx = 0;
win->_cury = 0;
win->_maxy = num_lines - 1;
win->_maxx = num_columns - 1;
win->_begy = begy;
win->_begx = begx;
win->_flags = 0;
win->_attrs = A_NORMAL;
win->_bkgd = A_NORMAL;
win->_clear = (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 = (WINDOW *)NULL;
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++)
{
win->_line[i].firstchar = win->_line[i].lastchar = _NOCHANGE;
win->_line[i].oldindex = i;
}
if (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;
}
return(win);
}
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