ucblib/libcurses/newwin.c

/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*LINTLIBRARY*/

#ifndef lint
static char
sccsid[] = "@(#)newwin.c 1.7 89/07/13 SMI"; /* from UCB 5.1 85/06/07 */
#endif  /* not lint */

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

#include    "curses.ext"
#include    <malloc.h>

#define SMALLOC (short *)malloc

/* forward declaration */
static WINDOW *makenew(int, int, int, int);

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

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

void
_set_subwin_(WINDOW *orig, WINDOW *win)
{
    int i, j, k;

    j = win->_begy - orig->_begy;
    k = win->_begx - orig->_begx;
    win->_ch_off = (short)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(int num_lines, int num_cols, int begy, int begx)
{
    WINDOW  *win;
    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 = (short)nl;
    win->_maxx = (short)nc;
    win->_begy = (short)by;
    win->_begx = (short)bx;
    win->_flags = 0;
    win->_scroll = win->_leave = FALSE;
    _swflags_(win);
    win->_orig = NULL;
#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);
}

void
_swflags_(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;
    }
}