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/* $OpenBSD: wresize.c,v 1.3 1997/12/03 05:21:46 millert Exp $ */
/******************************************************************************
* Copyright 1996,1997 by Thomas E. Dickey <dickey@clark.net> *
* All Rights Reserved. *
* *
* Permission to use, copy, modify, and distribute this software and its *
* documentation for any purpose and without fee is hereby granted, provided *
* that the above copyright notice appear in all copies and that both that *
* copyright notice and this permission notice appear in supporting *
* documentation, and that the name of the above listed copyright holder(s) *
* not be used in advertising or publicity pertaining to distribution of the *
* software without specific, written prior permission. THE ABOVE LISTED *
* COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, *
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO *
* EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY *
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER *
* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF *
* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN *
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
******************************************************************************/
#include <curses.priv.h>
#include <term.h>
MODULE_ID("Id: wresize.c,v 1.8 1997/09/20 15:03:39 juergen Exp $")
/*
* Reallocate a curses WINDOW struct to either shrink or grow to the specified
* new lines/columns. If it grows, the new character cells are filled with
* blanks. The application is responsible for repainting the blank area.
*/
static void *doalloc(void *p, size_t n)
{
if (p == 0)
p = malloc(n);
else
p = realloc(p, n);
if (p == 0)
errno = ENOMEM;
return p;
}
#define DOALLOC(p,t,n) (t *)doalloc(p, sizeof(t)*(n))
#define ld_ALLOC(p,n) DOALLOC(p,struct ldat,n)
#define c_ALLOC(p,n) DOALLOC(p,chtype,n)
int
wresize(WINDOW *win, int ToLines, int ToCols)
{
register int row;
int size_x, size_y;
struct ldat *pline;
chtype blank;
#ifdef TRACE
T((T_CALLED("wresize(%p,%d,%d)"), win, ToLines, ToCols));
if (win) {
TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
win->_begy, win->_begx,
win->_maxy, win->_maxx,
win->_regtop, win->_regbottom));
if (_nc_tracing & TRACE_UPDATE)
_tracedump("...before", win);
}
#endif
if (!win || --ToLines < 0 || --ToCols < 0)
returnCode(ERR);
size_x = win->_maxx;
size_y = win->_maxy;
if (ToLines == size_y
&& ToCols == size_x)
returnCode(OK);
pline = (win->_flags & _SUBWIN) ? win->_parent->_line : 0;
/*
* If the number of lines has changed, adjust the size of the overall
* vector:
*/
if (ToLines != size_y) {
if (! (win->_flags & _SUBWIN)) {
for (row = ToLines+1; row <= size_y; row++)
free((char *)(win->_line[row].text));
}
win->_line = ld_ALLOC(win->_line, ToLines+1);
if (win->_line == 0)
returnCode(ERR);
for (row = size_y+1; row <= ToLines; row++) {
win->_line[row].text = 0;
win->_line[row].firstchar = 0;
win->_line[row].lastchar = ToCols;
if ((win->_flags & _SUBWIN)) {
win->_line[row].text =
&pline[win->_begy + row].text[win->_begx];
}
}
}
/*
* Adjust the width of the columns:
*/
blank = _nc_background(win);
for (row = 0; row <= ToLines; row++) {
chtype *s = win->_line[row].text;
int begin = (s == 0) ? 0 : size_x + 1;
int end = ToCols;
if_USE_SCROLL_HINTS(win->_line[row].oldindex = row);
if (ToCols != size_x || s == 0) {
if (! (win->_flags & _SUBWIN)) {
win->_line[row].text = s = c_ALLOC(s, ToCols+1);
if (win->_line[row].text == 0)
returnCode(ERR);
} else if (s == 0) {
win->_line[row].text = s =
&pline[win->_begy + row].text[win->_begx];
}
if (end >= begin) { /* growing */
if (win->_line[row].firstchar < begin)
win->_line[row].firstchar = begin;
win->_line[row].lastchar = ToCols;
do {
s[end] = blank;
} while (--end >= begin);
} else { /* shrinking */
win->_line[row].firstchar = 0;
win->_line[row].lastchar = ToCols;
}
}
}
/*
* Finally, adjust the parameters showing screen size and cursor
* position:
*/
win->_maxx = ToCols;
win->_maxy = ToLines;
if (win->_regtop > win->_maxy)
win->_regtop = win->_maxy;
if (win->_regbottom > win->_maxy
|| win->_regbottom == size_y)
win->_regbottom = win->_maxy;
if (win->_curx > win->_maxx)
win->_curx = win->_maxx;
if (win->_cury > win->_maxy)
win->_cury = win->_maxy;
#ifdef TRACE
TR(TRACE_UPDATE, ("...beg (%d, %d), max(%d,%d), reg(%d,%d)",
win->_begy, win->_begx,
win->_maxy, win->_maxx,
win->_regtop, win->_regbottom));
if (_nc_tracing & TRACE_UPDATE)
_tracedump("...after:", win);
#endif
returnCode(OK);
}
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