NetBSD/lib/libcurses/newwin.c

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/* $NetBSD: newwin.c,v 1.22 2000/04/20 13:12:14 blymn Exp $ */
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/*
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* Copyright (c) 1981, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)newwin.c 8.3 (Berkeley) 7/27/94";
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#else
__RCSID("$NetBSD: newwin.c,v 1.22 2000/04/20 13:12:14 blymn Exp $");
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#endif
#endif /* not lint */
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#include <stdlib.h>
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#include "curses.h"
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#include "curses_private.h"
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extern struct __winlist *winlistp;
static WINDOW *__makenew(int nlines, int ncols, int by, int bx, int sub);
void __set_subwin(WINDOW *orig, WINDOW *win);
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/*
* derwin --
* Create a new window in the same manner as subwin but (by, bx)
* are relative to the origin of window orig instead of absolute.
*/
WINDOW *
derwin(WINDOW *orig, int nlines, int ncols, int by, int bx)
{
if (orig == NULL)
return ERR;
return subwin(orig, nlines, ncols, orig->begy + by, orig->begx + bx);
}
/*
* dupwin --
* Create a copy of the given window.
*/
WINDOW *
dupwin(WINDOW *win)
{
WINDOW *new_one;
if ((new_one =
newwin(win->maxy, win->maxx, win->begy, win->begx)) == NULL)
return NULL;
overwrite(win, new_one);
return new_one;
}
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/*
* newwin --
* Allocate space for and set up defaults for a new window.
*/
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WINDOW *
newwin(int nlines, int ncols, int by, int bx)
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{
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WINDOW *win;
__LINE *lp;
int i, j;
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__LDATA *sp;
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if (nlines == 0)
nlines = LINES - by;
if (ncols == 0)
ncols = COLS - bx;
if ((win = __makenew(nlines, ncols, by, bx, 0)) == NULL)
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return (NULL);
win->nextp = win;
win->ch_off = 0;
win->orig = NULL;
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#ifdef DEBUG
__CTRACE("newwin: win->ch_off = %d\n", win->ch_off);
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#endif
for (i = 0; i < nlines; i++) {
lp = win->lines[i];
lp->flags = 0;
for (sp = lp->line, j = 0; j < ncols; j++, sp++) {
sp->ch = ' ';
sp->bch = ' ';
sp->attr = 0;
sp->battr = 0;
}
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lp->hash = __hash((char *)(void *)lp->line,
(int) (ncols * __LDATASIZE));
}
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return (win);
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}
WINDOW *
subwin(WINDOW *orig, int nlines, int ncols, int by, int bx)
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{
int i;
__LINE *lp;
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WINDOW *win;
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/* Make sure window fits inside the original one. */
#ifdef DEBUG
__CTRACE("subwin: (%0.2o, %d, %d, %d, %d)\n", orig, nlines, ncols, by, bx);
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#endif
if (by < orig->begy || bx < orig->begx
|| by + nlines > orig->maxy + orig->begy
|| bx + ncols > orig->maxx + orig->begx)
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return (NULL);
if (nlines == 0)
nlines = orig->maxy + orig->begy - by;
if (ncols == 0)
ncols = orig->maxx + orig->begx - bx;
if ((win = __makenew(nlines, ncols, by, bx, 1)) == NULL)
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return (NULL);
win->nextp = orig->nextp;
orig->nextp = win;
win->orig = orig;
/* Initialize flags here so that refresh can also use __set_subwin. */
for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++)
lp->flags = 0;
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__set_subwin(orig, win);
return (win);
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}
/*
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* This code is shared with mvwin().
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*/
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void
__set_subwin(WINDOW *orig, WINDOW *win)
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{
int i;
__LINE *lp, *olp;
win->ch_off = win->begx - orig->begx;
/* Point line pointers to line space. */
for (lp = win->lspace, i = 0; i < win->maxy; i++, lp++) {
win->lines[i] = lp;
olp = orig->lines[i + win->begy - orig->begy];
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lp->line = &olp->line[win->ch_off];
lp->firstchp = &olp->firstch;
lp->lastchp = &olp->lastch;
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lp->hash = __hash((char *)(void *)lp->line,
(int) (win->maxx * __LDATASIZE));
}
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#ifdef DEBUG
__CTRACE("__set_subwin: win->ch_off = %d\n", win->ch_off);
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#endif
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}
/*
* __makenew --
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* Set up a window buffer and returns a pointer to it.
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*/
static WINDOW *
__makenew(int nlines, int ncols, int by, int bx, int sub)
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{
WINDOW *win;
__LINE *lp;
struct __winlist *wlp, *wlp2;
int i;
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#ifdef DEBUG
__CTRACE("makenew: (%d, %d, %d, %d)\n", nlines, ncols, by, bx);
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#endif
if ((win = malloc(sizeof(*win))) == NULL)
return (NULL);
#ifdef DEBUG
__CTRACE("makenew: nlines = %d\n", nlines);
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#endif
/* Set up line pointer array and line space. */
if ((win->lines = malloc(nlines * sizeof(__LINE *))) == NULL) {
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free(win);
return NULL;
}
if ((win->lspace = malloc(nlines * sizeof(__LINE))) == NULL) {
free(win);
free(win->lines);
return NULL;
}
/* Don't allocate window and line space if it's a subwindow */
if (!sub) {
/*
* Allocate window space in one chunk.
*/
if ((win->wspace =
malloc(ncols * nlines * sizeof(__LDATA))) == NULL) {
free(win->lines);
free(win->lspace);
free(win);
return NULL;
}
/*
* Append window to window list.
*/
if ((wlp = malloc(sizeof(struct __winlist))) == NULL) {
free(win->wspace);
free(win->lines);
free(win->lspace);
free(win);
return NULL;
}
wlp->winp = win;
wlp->nextp = NULL;
if (__winlistp == NULL)
__winlistp = wlp;
else {
wlp2 = __winlistp;
while (wlp2->nextp != NULL)
wlp2 = wlp2->nextp;
wlp2->nextp = wlp;
}
/*
* 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 = 0;
}
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}
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#ifdef DEBUG
__CTRACE("makenew: ncols = %d\n", ncols);
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#endif
win->cury = win->curx = 0;
win->maxy = nlines;
win->maxx = ncols;
win->begy = by;
win->begx = bx;
win->flags = 0;
win->delay = -1;
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win->wattr = 0;
win->bch = ' ';
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win->battr = 0;
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__swflags(win);
#ifdef DEBUG
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__CTRACE("makenew: win->wattr = %0.2o\n", win->wattr);
__CTRACE("makenew: win->flags = %0.2o\n", win->flags);
__CTRACE("makenew: win->maxy = %d\n", win->maxy);
__CTRACE("makenew: win->maxx = %d\n", win->maxx);
__CTRACE("makenew: win->begy = %d\n", win->begy);
__CTRACE("makenew: win->begx = %d\n", win->begx);
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#endif
return (win);
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}
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void
__swflags(WINDOW *win)
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{
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win->flags &= ~(__ENDLINE | __FULLWIN | __SCROLLWIN | __LEAVEOK);
if (win->begx + win->maxx == COLS) {
win->flags |= __ENDLINE;
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if (win->begx == 0 && win->maxy == LINES && win->begy == 0)
win->flags |= __FULLWIN;
if (win->begy + win->maxy == LINES)
win->flags |= __SCROLLWIN;
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}
}