NetBSD/lib/libcurses/resize.c

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/* $NetBSD: resize.c,v 1.2 2002/01/02 10:38:29 blymn Exp $ */
/*
* Copyright (c) 2001
* Brett Lymn.
*
* This code has been donated to The NetBSD Foundation by the Author.
*
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)resize.c blymn 2001/08/26";
#else
__RCSID("$NetBSD: resize.c,v 1.2 2002/01/02 10:38:29 blymn Exp $");
#endif
#endif /* not lint */
#include <stdlib.h>
#include "curses.h"
#include "curses_private.h"
extern struct __winlist *winlistp;
static int __resizewin(WINDOW *win, int nlines, int ncols);
/*
* wresize --
* Resize the given window to the new size.
*/
int
wresize(WINDOW *win, int nlines, int ncols)
{
__LINE *lp;
int i, j;
__LDATA *sp;
if ((win == NULL) || (nlines < 0) || (ncols < 0))
return ERR;
if (win->orig == NULL) {
if (nlines == 0)
nlines = LINES - win->begy;
if (ncols == 0)
ncols = COLS - win->begx;
} else {
/* subwins must fit inside the parent - check this */
if ((nlines == 0)
|| (nlines > (win->orig->maxy + win->orig->begy
- win->begy)))
nlines = win->orig->maxy + win->orig->begy - win->begy;
if ((ncols == 0)
|| (ncols > (win->orig->maxx + win->orig->begx
- win->begx)))
ncols = win->orig->maxx + win->orig->begx - win->begx;
}
if ((__resizewin(win, nlines, ncols)) == ERR)
return ERR;
/*
* we must zot the window contents otherwise lines may pick
* up attributes from the previous line when the window is
* made smaller. The client will redraw the window anyway
* so this is no big deal.
*/
for (i = 0; i < win->maxy; i++) {
lp = win->lines[i];
for (sp = lp->line, j = 0; j < win->maxx;
j++, sp++) {
sp->ch = ' ';
sp->bch = ' ';
sp->attr = 0;
sp->battr = 0;
}
lp->hash = __hash((char *)(void *)lp->line,
(int) (ncols * __LDATASIZE));
}
return OK;
}
/*
* resizeterm --
* Resize the terminal window, resizing the dependent windows.
*/
int
resizeterm(int nlines, int ncols)
{
WINDOW *win;
struct __winlist *list;
int newlines, newcols, ldelta, cdelta;
/* don't worry if things have not changed... we would like to
do this but some bastard programs update LINES and COLS before
calling resizeterm thus negating it's effect.
if ((nlines == LINES) && (ncols == COLS))
return OK;*/
#ifdef DEBUG
__CTRACE("resizeterm: (%d, %d)\n", nlines, ncols);
#endif
ldelta = nlines - __virtscr->maxy;
cdelta = ncols - __virtscr->maxx;
for (list = __winlistp; list != NULL; list = list->nextp) {
win = list->winp;
newlines = win->maxy;
newcols = win->maxx;
if (win->begy >= (nlines - 1)) {
win->begy = nlines - win->maxx - 1;
if (win->begy < 0)
win->begy = 0;
}
if ((newlines + win->begy + ldelta) == nlines)
newlines = nlines;
if (newlines > nlines) {
newlines = nlines - win->begy;
if (newlines < 0)
newlines = 1;
}
if ((newcols + win->begx + cdelta) == ncols)
newcols = ncols;
if (newcols > ncols) {
newcols = ncols - win->begx;
if (newcols < 0)
newcols = 1;
}
if (wresize(win, newlines, newcols) != OK)
return ERR;
}
LINES = nlines;
COLS = ncols;
/* tweak the flags now that we have updated the LINES and COLS */
for (list = __winlistp; list != NULL; list = list->nextp) {
__swflags(list->winp);
}
wrefresh(curscr);
return OK;
}
/*
* __resizewin --
* Resize the given window.
*/
static int
__resizewin(WINDOW *win, int nlines, int ncols)
{
__LINE *lp, *olp, **newlines, *newlspace;
__LDATA *newwspace;
int i;
#ifdef DEBUG
__CTRACE("resize: (%d, %d)\n", nlines, ncols);
__CTRACE("resize: win->wattr = %0.2o\n", win->wattr);
__CTRACE("resize: win->flags = %0.2o\n", win->flags);
__CTRACE("resize: win->maxy = %d\n", win->maxy);
__CTRACE("resize: win->maxx = %d\n", win->maxx);
__CTRACE("resize: win->begy = %d\n", win->begy);
__CTRACE("resize: win->begx = %d\n", win->begx);
__CTRACE("resize: win->scr_t = %d\n", win->scr_t);
__CTRACE("resize: win->scr_b = %d\n", win->scr_b);
#endif
/* Reallocate line pointer array and line space. */
if ((newlines = realloc(win->lines,
nlines * sizeof(__LINE *))) == NULL) {
return ERR;
}
win->lines = newlines;
if ((newlspace = realloc(win->lspace,
nlines * sizeof(__LINE))) == NULL) {
return ERR;
}
win->lspace = newlspace;
/* Don't allocate window and line space if it's a subwindow */
if (win->orig == NULL) {
/*
* Allocate window space in one chunk.
*/
if ((newwspace =
realloc(win->wspace,
ncols * nlines * sizeof(__LDATA))) == NULL) {
return ERR;
}
win->wspace = newwspace;
/*
* Point line pointers to line space, and lines themselves into
* window space.
*/
for (lp = win->lspace, i = 0; i < nlines; i++, lp++) {
win->lines[i] = lp;
lp->line = &win->wspace[i * ncols];
lp->firstchp = &lp->firstch;
lp->lastchp = &lp->lastch;
lp->firstch = 0;
lp->lastch = ncols - 1;
lp->flags = __ISDIRTY;
}
} else {
win->ch_off = win->begx - win->orig->begx;
/* Point line pointers to line space. */
for (lp = win->lspace, i = 0; i < nlines; i++, lp++) {
win->lines[i] = lp;
olp = win->orig->lines[i + win->begy
- win->orig->begy];
lp->line = &olp->line[win->ch_off];
lp->firstchp = &olp->firstch;
lp->lastchp = &olp->lastch;
lp->hash = __hash((char *)(void *)lp->line,
(int) (win->maxx * __LDATASIZE));
lp->flags = __ISDIRTY;
}
}
win->cury = win->curx = 0;
win->maxy = nlines;
win->maxx = ncols;
win->scr_b = win->maxy - 1;
__swflags(win);
#ifdef DEBUG
__CTRACE("resize: win->wattr = %0.2o\n", win->wattr);
__CTRACE("resize: win->flags = %0.2o\n", win->flags);
__CTRACE("resize: win->maxy = %d\n", win->maxy);
__CTRACE("resize: win->maxx = %d\n", win->maxx);
__CTRACE("resize: win->begy = %d\n", win->begy);
__CTRACE("resize: win->begx = %d\n", win->begx);
__CTRACE("resize: win->scr_t = %d\n", win->scr_t);
__CTRACE("resize: win->scr_b = %d\n", win->scr_b);
#endif
return OK;
}