source: trunk/obsolete-or-todo/emx/bsd/curses/newwin.c

/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)newwin.c    5.4 (Berkeley) 6/1/90";
#endif /* not lint */

/*
 * allocate space for and set up defaults for a new window
 *
 */

# include       "curses.ext"

char    *malloc();

# define        SMALLOC (short *) malloc

static WINDOW   *makenew();

# undef         nl      /* don't need it here, and it interferes        */

WINDOW *
newwin(num_lines, num_cols, begy, begx)
int     num_lines, num_cols, begy, begx;
{
        reg WINDOW      *win;
        reg char        *sp;
        reg int         i, by, bx, nl, nc;
        reg int         j;

        by = begy;
        bx = begx;
        nl = num_lines;
        nc = num_cols;

        if (nl == 0)
                nl = LINES - by;
        if (nc == 0)
                nc = COLS - bx;
        if ((win = makenew(nl, nc, by, bx)) == NULL)
                return ERR;
        if ((win->_firstch = SMALLOC(nl * sizeof win->_firstch[0])) == NULL) {
                free(win->_y);
                free(win);
                return NULL;
        }
        if ((win->_lastch = SMALLOC(nl * sizeof win->_lastch[0])) == NULL) {
                free(win->_y);
                free(win->_firstch);
                free(win);
                return NULL;
        }
        win->_nextp = win;
        for (i = 0; i < nl; i++) {
                win->_firstch[i] = _NOCHANGE;
                win->_lastch[i] = _NOCHANGE;
        }
        for (i = 0; i < nl; i++)
                if ((win->_y[i] = malloc(nc * sizeof win->_y[0])) == NULL) {
                        for (j = 0; j < i; j++)
                                free(win->_y[j]);
                        free(win->_firstch);
                        free(win->_lastch);
                        free(win->_y);
                        free(win);
                        return ERR;
                }
                else
                        for (sp = win->_y[i]; sp < win->_y[i] + nc; )
                                *sp++ = ' ';
        win->_ch_off = 0;
# ifdef DEBUG
        fprintf(outf, "NEWWIN: win->_ch_off = %d\n", win->_ch_off);
# endif
        return win;
}

WINDOW *
subwin(orig, num_lines, num_cols, begy, begx)
reg WINDOW      *orig;
int             num_lines, num_cols, begy, begx;
{
        reg int         i;
        reg WINDOW      *win;
        reg int         by, bx, nl, nc;

        by = begy;
        bx = begx;
        nl = num_lines;
        nc = num_cols;

        /*
         * make sure window fits inside the original one
         */
# ifdef DEBUG
        fprintf(outf, "SUBWIN(%0.2o, %d, %d, %d, %d)\n", orig, nl, nc, by, bx);
# endif
        if (by < orig->_begy || bx < orig->_begx
            || by + nl > orig->_maxy + orig->_begy
            || bx + nc > orig->_maxx + orig->_begx)
                return ERR;
        if (nl == 0)
                nl = orig->_maxy + orig->_begy - by;
        if (nc == 0)
                nc = orig->_maxx + orig->_begx - bx;
        if ((win = makenew(nl, nc, by, bx)) == NULL)
                return ERR;
        win->_nextp = orig->_nextp;
        orig->_nextp = win;
        win->_orig = orig;
        _set_subwin_(orig, win);
        return win;
}

/*
 * this code is shared with mvwin()
 */
_set_subwin_(orig, win)
register WINDOW *orig, *win;
{
        register int    i, j, k;

        j = win->_begy - orig->_begy;
        k = win->_begx - orig->_begx;
        win->_ch_off = k;
# ifdef DEBUG
        fprintf(outf, "_SET_SUBWIN_: win->_ch_off = %d\n", win->_ch_off);
# endif
        win->_firstch = &orig->_firstch[j];
        win->_lastch = &orig->_lastch[j];
        for (i = 0; i < win->_maxy; i++, j++)
                win->_y[i] = &orig->_y[j][k];

}

/*
 *      This routine sets up a window buffer and returns a pointer to it.
 */
static WINDOW *
makenew(num_lines, num_cols, begy, begx)
int     num_lines, num_cols, begy, begx; {

        reg int         i;
        reg WINDOW      *win;
        reg int         by, bx, nl, nc;

        by = begy;
        bx = begx;
        nl = num_lines;
        nc = num_cols;

# ifdef DEBUG
        fprintf(outf, "MAKENEW(%d, %d, %d, %d)\n", nl, nc, by, bx);
# endif
        if ((win = (WINDOW *) malloc(sizeof *win)) == NULL)
                return NULL;
# ifdef DEBUG
        fprintf(outf, "MAKENEW: nl = %d\n", nl);
# endif
        if ((win->_y = (char **) malloc(nl * sizeof win->_y[0])) == NULL) {
                free(win);
                return NULL;
        }
# ifdef DEBUG
        fprintf(outf, "MAKENEW: nc = %d\n", nc);
# endif
        win->_cury = win->_curx = 0;
        win->_clear = FALSE;
        win->_maxy = nl;
        win->_maxx = nc;
        win->_begy = by;
        win->_begx = bx;
        win->_flags = 0;
        win->_scroll = win->_leave = FALSE;
        _swflags_(win);
# ifdef DEBUG
        fprintf(outf, "MAKENEW: win->_clear = %d\n", win->_clear);
        fprintf(outf, "MAKENEW: win->_leave = %d\n", win->_leave);
        fprintf(outf, "MAKENEW: win->_scroll = %d\n", win->_scroll);
        fprintf(outf, "MAKENEW: win->_flags = %0.2o\n", win->_flags);
        fprintf(outf, "MAKENEW: win->_maxy = %d\n", win->_maxy);
        fprintf(outf, "MAKENEW: win->_maxx = %d\n", win->_maxx);
        fprintf(outf, "MAKENEW: win->_begy = %d\n", win->_begy);
        fprintf(outf, "MAKENEW: win->_begx = %d\n", win->_begx);
# endif
        return win;
}

_swflags_(win)
register WINDOW *win;
{
        win->_flags &= ~(_ENDLINE|_FULLLINE|_FULLWIN|_SCROLLWIN);
        if (win->_begx + win->_maxx == COLS) {
                win->_flags |= _ENDLINE;
                if (win->_begx == 0) {
                        if (AL && DL)
                                win->_flags |= _FULLLINE;
                        if (win->_maxy == LINES && win->_begy == 0)
                                win->_flags |= _FULLWIN;
                }
                if (win->_begy + win->_maxy == LINES)
                        win->_flags |= _SCROLLWIN;
        }
}