Net2/usr/src/lib/libcurses/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;
}
}