/*      @(#)wwsize.c    8.1 (Berkeley) 6/6/93   */
/*      $NetBSD: wwsize.c,v 1.9 2006/05/02 22:24:05 christos Exp $      */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * 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. 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.
 */

#include <stdlib.h>
#include "ww.h"

/*
 * Resize a window.  Should be unattached.
 */
int
wwsize(struct ww *w, int nrow, int ncol)
{
        int i, j;
        int nline = 0;
        union ww_char **buf = NULL;
        char **win = NULL;
        short *nvis = NULL;
        char **fmap = NULL;
        char m;

        /*
         * First allocate new buffers.
         */
        win = wwalloc(w->ww_w.t, w->ww_w.l, nrow, ncol, sizeof (char));
        if (win == NULL)
                goto bad;
        if (w->ww_fmap != 0) {
                fmap = wwalloc(w->ww_w.t, w->ww_w.l, nrow, ncol, sizeof (char));
                if (fmap == NULL)
                        goto bad;
        }
        if (nrow > w->ww_b.nr || ncol > w->ww_b.nc) {
                nline = MAX(w->ww_b.nr, nrow);
                buf = (union ww_char **) wwalloc(w->ww_b.t, w->ww_b.l,
                        nline, ncol, sizeof (union ww_char));
                if (buf == NULL)
                        goto bad;
        }
        nvis = malloc((unsigned) nrow * sizeof (short));
        if (nvis == NULL) {
                wwerrno = WWE_NOMEM;
                goto bad;
        }
        nvis -= w->ww_w.t;
        /*
         * Copy text buffer.
         */
        if (buf != NULL) {
                int b, r;

                b = w->ww_b.t + nline;
                r = w->ww_b.l + ncol;
                if (ncol < w->ww_b.nc)
                        for (i = w->ww_b.t; i < w->ww_b.b; i++)
                                for (j = w->ww_b.l; j < r; j++)
                                        buf[i][j] = w->ww_buf[i][j];
                else
                        for (i = w->ww_b.t; i < w->ww_b.b; i++) {
                                for (j = w->ww_b.l; j < w->ww_b.r; j++)
                                        buf[i][j] = w->ww_buf[i][j];
                                for (; j < r; j++)
                                        buf[i][j].c_w = ' ';
                        }
                for (; i < b; i++)
                        for (j = w->ww_b.l; j < r; j++)
                                buf[i][j].c_w = ' ';
        }
        /*
         * Now free the old stuff.
         */
        wwfree((char **)w->ww_win, w->ww_w.t);
        w->ww_win = win;
        if (buf != NULL) {
                wwfree((char **)w->ww_buf, w->ww_b.t);
                w->ww_buf = buf;
        }
        if (w->ww_fmap != 0) {
                wwfree((char **)w->ww_fmap, w->ww_w.t);
                w->ww_fmap = fmap;
        }
        free((char *)(w->ww_nvis + w->ww_w.t));
        w->ww_nvis = nvis;
        /*
         * Set new sizes.
         */
                /* window */
        w->ww_w.b = w->ww_w.t + nrow;
        w->ww_w.r = w->ww_w.l + ncol;
        w->ww_w.nr = nrow;
        w->ww_w.nc = ncol;
                /* text buffer */
        if (buf != NULL) {
                w->ww_b.b = w->ww_b.t + nline;
                w->ww_b.r = w->ww_b.l + ncol;
                w->ww_b.nr = nline;
                w->ww_b.nc = ncol;
        }
                /* scroll */
        if ((i = w->ww_b.b - w->ww_w.b) < 0 ||
            (i = w->ww_cur.r - w->ww_w.b + 1) > 0) {
                w->ww_buf += i;
                w->ww_b.t -= i;
                w->ww_b.b -= i;
                w->ww_cur.r -= i;
        }
                /* interior */
        w->ww_i.b = MIN(w->ww_w.b, wwnrow);
        w->ww_i.r = MIN(w->ww_w.r, wwncol);
        w->ww_i.nr = w->ww_i.b - w->ww_i.t;
        w->ww_i.nc = w->ww_i.r - w->ww_i.l;
        /*
         * Initialize new buffers.
         */
                /* window */
        m = 0;
        if (w->ww_oflags & WWO_GLASS)
                m |= WWM_GLS;
        if (w->ww_oflags & WWO_REVERSE)
                m |= WWM_REV;
        for (i = w->ww_w.t; i < w->ww_w.b; i++)
                for (j = w->ww_w.l; j < w->ww_w.r; j++)
                        w->ww_win[i][j] = m;
                /* frame map */
        if (fmap != NULL)
                for (i = w->ww_w.t; i < w->ww_w.b; i++)
                        for (j = w->ww_w.l; j < w->ww_w.r; j++)
                                w->ww_fmap[i][j] = 0;
                /* visibility */
        j = m ? 0 : w->ww_w.nc;
        for (i = w->ww_w.t; i < w->ww_w.b; i++)
                w->ww_nvis[i] = j;
        /*
         * Put cursor back.
         */
        if (ISSET(w->ww_wflags, WWW_HASCURSOR)) {
                CLR(w->ww_wflags, WWW_HASCURSOR);
                wwcursor(w, 1);
        }
        /*
         * Fool with pty.
         */
        if (w->ww_type == WWT_PTY && w->ww_pty >= 0)
                (void) wwsetttysize(w->ww_pty, nrow, ncol);
        return 0;
bad:
        if (win != NULL)
                wwfree(win, w->ww_w.t);
        if (fmap != NULL)
                wwfree(fmap, w->ww_w.t);
        if (buf != NULL)
                wwfree((char **)buf, w->ww_b.t);
        return -1;
}