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screen/resize.c
Daniel Baumann e88291c4cd
Adding upstream version 4.9.1. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 15:19:57 +02:00

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/* Copyright (c) 2008, 2009
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Micah Cowan (micah@cowan.name)
* Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
* Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Copyright (c) 1987 Oliver Laumann
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING); if not, see
* https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*
****************************************************************
*/
#include <sys/types.h>
#include <signal.h>
#ifndef sun
#include <sys/ioctl.h>
#endif
#ifdef ISC
# include <sys/tty.h>
# include <sys/sioctl.h>
# include <sys/pty.h>
#endif
#include "config.h"
#include "screen.h"
#include "extern.h"
/* maximum window width */
#define MAXWIDTH 1000
static void CheckMaxSize __P((int));
static void FreeMline __P((struct mline *));
static int AllocMline __P((struct mline *ml, int));
static void MakeBlankLine __P((unsigned char *, int));
static void kaablamm __P((void));
static int BcopyMline __P((struct mline *, int, struct mline *, int, int, int));
static void SwapAltScreen __P((struct win *));
extern struct layer *flayer;
extern struct display *display, *displays;
extern unsigned char *blank, *null;
extern struct mline mline_blank, mline_null, mline_old;
extern struct win *windows;
extern const int Z0width, Z1width;
extern int captionalways;
#if defined(TIOCGWINSZ) || defined(TIOCSWINSZ)
struct winsize glwz;
#endif
static struct mline mline_zero = {
(unsigned char *)0,
(unsigned char *)0
#ifdef FONT
,(unsigned char *)0
#endif
#ifdef COLOR
,(unsigned char *)0
# ifdef COLORS256
,(unsigned char *)0
# endif
#endif
};
/*
* ChangeFlag: 0: try to modify no window
* 1: modify fore (and try to modify no other) + redisplay
* 2: modify all windows
*
* Note: Activate() is only called if change_flag == 1
* i.e. on a WINCH event
*/
void
CheckScreenSize(change_flag)
int change_flag;
{
int wi, he;
if (display == 0)
{
debug("CheckScreenSize: No display -> no check.\n");
return;
}
#ifdef TIOCGWINSZ
if (ioctl(D_userfd, TIOCGWINSZ, (char *)&glwz) != 0)
{
debug2("CheckScreenSize: ioctl(%d, TIOCGWINSZ) errno %d\n", D_userfd, errno);
wi = D_CO;
he = D_LI;
}
else
{
wi = glwz.ws_col;
he = glwz.ws_row;
if (wi == 0)
wi = D_CO;
if (he == 0)
he = D_LI;
}
#else
wi = D_CO;
he = D_LI;
#endif
debug2("CheckScreenSize: screen is (%d,%d)\n", wi, he);
#if 0 /* XXX: Fixme */
if (change_flag == 2)
{
debug("Trying to adapt all windows (-A)\n");
for (p = windows; p; p = p->w_next)
if (p->w_display == 0 || p->w_display == display)
ChangeWindowSize(p, wi, he, p->w_histheight);
}
#endif
if (D_width == wi && D_height == he)
{
debug("CheckScreenSize: No change -> return.\n");
return;
}
#ifdef BLANKER_PRG
KillBlanker();
#endif
ResetIdle();
ChangeScreenSize(wi, he, change_flag);
/* XXX Redisplay logic */
#if 0
if (change_flag == 1)
Redisplay(D_fore ? D_fore->w_norefresh : 0);
#endif
}
void
ChangeScreenSize(wi, he, change_fore)
int wi, he;
int change_fore;
{
struct win *p;
struct canvas *cv;
int wwi;
debug2("ChangeScreenSize from (%d,%d) ", D_width, D_height);
debug3("to (%d,%d) (change_fore: %d)\n",wi, he, change_fore);
cv = &D_canvas;
cv->c_xe = wi - 1;
cv->c_ys = (D_has_hstatus == HSTATUS_FIRSTLINE);
cv->c_ye = he - 1 - ((cv->c_slperp && cv->c_slperp->c_slnext) || captionalways) - (D_has_hstatus == HSTATUS_LASTLINE);
cv->c_blank.l_height = cv->c_ye - cv->c_ys + 1;
if (cv->c_slperp)
{
ResizeCanvas(cv);
RecreateCanvasChain();
RethinkDisplayViewports();
}
if (D_forecv == 0)
D_forecv = D_cvlist;
if (D_forecv)
D_fore = Layer2Window(D_forecv->c_layer);
D_width = wi;
D_height = he;
CheckMaxSize(wi);
if (D_CWS)
{
D_defwidth = D_CO;
D_defheight = D_LI;
}
else
{
if (D_CZ0 && (wi == Z0width || wi == Z1width) &&
(D_CO == Z0width || D_CO == Z1width))
D_defwidth = D_CO;
else
D_defwidth = wi;
D_defheight = he;
}
debug2("Default size: (%d,%d)\n", D_defwidth, D_defheight);
if (change_fore)
ResizeLayersToCanvases();
if (change_fore == 2 && D_CWS == NULL && displays->d_next == 0)
{
/* adapt all windows - to be removed ? */
for (p = windows; p; p = p->w_next)
{
debug1("Trying to change window %d.\n", p->w_number);
wwi = wi;
#if 0
if (D_CZ0 && p->w_width != wi && (wi == Z0width || wi == Z1width))
{
if (p->w_width > (Z0width + Z1width) / 2)
wwi = Z0width;
else
wwi = Z1width;
}
#endif
if (p->w_savelayer && p->w_savelayer->l_cvlist == 0)
ResizeLayer(p->w_savelayer, wwi, he, 0);
#if 0
ChangeWindowSize(p, wwi, he, p->w_histheight);
#endif
}
}
}
void
ResizeLayersToCanvases()
{
struct canvas *cv;
struct layer *l;
int lx, ly;
debug("ResizeLayersToCanvases\n");
D_kaablamm = 0;
for (cv = D_cvlist; cv; cv = cv->c_next)
{
l = cv->c_layer;
if (l == 0)
continue;
debug("Doing canvas: ");
if (l->l_width == cv->c_xe - cv->c_xs + 1 &&
l->l_height == cv->c_ye - cv->c_ys + 1)
{
debug("already fitting.\n");
continue;
}
if (!MayResizeLayer(l))
{
debug("may not resize.\n");
}
else
{
debug("doing resize.\n");
ResizeLayer(l, cv->c_xe - cv->c_xs + 1, cv->c_ye - cv->c_ys + 1, display);
}
/* normalize window, see screen.c */
lx = cv->c_layer->l_x;
ly = cv->c_layer->l_y;
if (ly + cv->c_yoff < cv->c_ys)
{
cv->c_yoff = cv->c_ys - ly;
RethinkViewportOffsets(cv);
}
else if (ly + cv->c_yoff > cv->c_ye)
{
cv->c_yoff = cv->c_ye - ly;
RethinkViewportOffsets(cv);
}
if (lx + cv->c_xoff < cv->c_xs)
{
int n = cv->c_xs - (lx + cv->c_xoff);
if (n < (cv->c_xe - cv->c_xs + 1) / 2)
n = (cv->c_xe - cv->c_xs + 1) / 2;
if (cv->c_xoff + n > cv->c_xs)
n = cv->c_xs - cv->c_xoff;
cv->c_xoff += n;
RethinkViewportOffsets(cv);
}
else if (lx + cv->c_xoff > cv->c_xe)
{
int n = lx + cv->c_xoff - cv->c_xe;
if (n < (cv->c_xe - cv->c_xs + 1) / 2)
n = (cv->c_xe - cv->c_xs + 1) / 2;
if (cv->c_xoff - n + cv->c_layer->l_width - 1 < cv->c_xe)
n = cv->c_xoff + cv->c_layer->l_width - 1 - cv->c_xe;
cv->c_xoff -= n;
RethinkViewportOffsets(cv);
}
}
Redisplay(0);
if (D_kaablamm)
{
kaablamm();
D_kaablamm = 0;
}
}
int
MayResizeLayer(l)
struct layer *l;
{
int cvs = 0;
debug("MayResizeLayer:\n");
for (; l; l = l->l_next)
{
if (l->l_cvlist)
if (++cvs > 1 || l->l_cvlist->c_lnext)
{
debug1("may not - cvs %d\n", cvs);
return 0;
}
}
debug("may resize\n");
return 1;
}
/*
* Easy implementation: rely on the fact that the only layers
* supporting resize are Win and Blank. So just kill all overlays.
*
* This is a lot harder if done the right way...
*/
static void
kaablamm()
{
Msg(0, "Aborted because of window size change.");
}
/* Kills non-resizable layers. */
#define RESIZE_OR_KILL_LAYERS(l, wi, he) do \
{ \
struct layer *_last = NULL; \
flayer = (l); \
while (flayer->l_next) \
{ \
if (LayResize(wi, he) == 0) \
{ \
_last = flayer; \
flayer = flayer->l_next; \
} \
else \
{ \
struct canvas *_cv; \
for (_cv = flayer->l_cvlist; _cv; _cv = _cv->c_lnext) \
_cv->c_display->d_kaablamm = 1; \
ExitOverlayPage(); \
if (_last) \
_last->l_next = flayer; \
} \
} \
/* We assume that the bottom-most layer, i.e. when flayer->l_next == 0, \
* is always resizable. Currently, WinLf and BlankLf can be the bottom-most layers. \
*/ \
LayResize(wi, he); \
} while (0)
void
ResizeLayer(l, wi, he, norefdisp)
struct layer *l;
int wi, he;
struct display *norefdisp;
{
struct win *p;
struct canvas *cv;
struct layer *oldflayer = flayer;
struct display *d, *olddisplay = display;
if (l->l_width == wi && l->l_height == he)
return;
p = Layer2Window(l);
/* If 'flayer' and 'l' are for the same window, then we will not
* restore 'flayer'. */
if (oldflayer && (l == oldflayer || Layer2Window(oldflayer) == p))
oldflayer = NULL;
flayer = l;
if (p)
{
/* It's a window layer. Kill the overlays on it in all displays. */
for (d = displays; d; d = d->d_next)
for (cv = d->d_cvlist; cv; cv = cv->c_next)
{
if (p == Layer2Window(cv->c_layer))
{
/* Canvas 'cv' on display 'd' shows this window. Remove any non-resizable
* layers over it. */
RESIZE_OR_KILL_LAYERS(cv->c_layer, wi, he);
}
}
}
else
{
/* It's a Blank layer. Just kill the non-resizable overlays over it. */
RESIZE_OR_KILL_LAYERS(flayer, wi, he);
}
for (display = displays; display; display = display->d_next)
{
if (display == norefdisp)
continue;
for (cv = D_cvlist; cv; cv = cv->c_next)
if (Layer2Window(cv->c_layer) == p)
{
CV_CALL(cv, LayRedisplayLine(-1, -1, -1, 0));
RefreshArea(cv->c_xs, cv->c_ys, cv->c_xe, cv->c_ye, 0);
}
if (D_kaablamm)
{
kaablamm();
D_kaablamm = 0;
}
}
/* If we started resizing a non-flayer layer, then restore the flayer.
* Otherwise, flayer should already be updated to the topmost foreground layer. */
if (oldflayer)
flayer = oldflayer;
display = olddisplay;
}
static void
FreeMline(ml)
struct mline *ml;
{
if (ml->image)
free(ml->image);
if (ml->attr && ml->attr != null)
free(ml->attr);
#ifdef FONT
if (ml->font && ml->font != null)
free(ml->font);
if (ml->fontx && ml->fontx != null)
free(ml->fontx);
#endif
#ifdef COLOR
if (ml->color && ml->color != null)
free(ml->color);
# ifdef COLORS256
if (ml->colorx && ml->colorx != null)
free(ml->colorx);
# endif
#endif
*ml = mline_zero;
}
static int
AllocMline(ml, w)
struct mline *ml;
int w;
{
ml->image = malloc(w);
ml->attr = null;
#ifdef FONT
ml->font = null;
ml->fontx = null;
#endif
#ifdef COLOR
ml->color = null;
# ifdef COLORS256
ml->colorx = null;
# endif
#endif
if (ml->image == 0)
return -1;
return 0;
}
static int
BcopyMline(mlf, xf, mlt, xt, l, w)
struct mline *mlf, *mlt;
int xf, xt, l, w;
{
int r = 0;
bcopy((char *)mlf->image + xf, (char *)mlt->image + xt, l);
if (mlf->attr != null && mlt->attr == null)
{
if ((mlt->attr = (unsigned char *)calloc(w, 1)) == 0)
mlt->attr = null, r = -1;
}
if (mlt->attr != null)
bcopy((char *)mlf->attr + xf, (char *)mlt->attr + xt, l);
#ifdef FONT
if (mlf->font != null && mlt->font == null)
{
if ((mlt->font = (unsigned char *)calloc(w, 1)) == 0)
mlt->font = null, r = -1;
}
if (mlt->font != null)
bcopy((char *)mlf->font + xf, (char *)mlt->font + xt, l);
if (mlf->fontx != null && mlt->fontx == null)
{
if ((mlt->fontx = (unsigned char *)calloc(w, 1)) == 0)
mlt->fontx = null, r = -1;
}
if (mlt->fontx != null)
bcopy((char *)mlf->fontx + xf, (char *)mlt->fontx + xt, l);
#endif
#ifdef COLOR
if (mlf->color != null && mlt->color == null)
{
if ((mlt->color = (unsigned char *)calloc(w, 1)) == 0)
mlt->color = null, r = -1;
}
if (mlt->color != null)
bcopy((char *)mlf->color + xf, (char *)mlt->color + xt, l);
# ifdef COLORS256
if (mlf->colorx != null && mlt->colorx == null)
{
if ((mlt->colorx = (unsigned char *)calloc(w, 1)) == 0)
mlt->colorx = null, r = -1;
}
if (mlt->colorx != null)
bcopy((char *)mlf->colorx + xf, (char *)mlt->colorx + xt, l);
# endif
#endif
return r;
}
static int maxwidth;
static void
CheckMaxSize(wi)
int wi;
{
unsigned char *oldnull = null;
unsigned char *oldblank = blank;
struct win *p;
int i;
struct mline *ml;
if (wi > MAXWIDTH)
wi = MAXWIDTH;
if (wi <= maxwidth)
return;
maxwidth = wi + 1;
debug1("New maxwidth: %d\n", maxwidth);
blank = (unsigned char *)xrealloc((char *)blank, maxwidth);
null = (unsigned char *)xrealloc((char *)null, maxwidth);
mline_old.image = (unsigned char *)xrealloc((char *)mline_old.image, maxwidth);
mline_old.attr = (unsigned char *)xrealloc((char *)mline_old.attr, maxwidth);
#ifdef FONT
mline_old.font = (unsigned char *)xrealloc((char *)mline_old.font, maxwidth);
mline_old.fontx = (unsigned char *)xrealloc((char *)mline_old.fontx, maxwidth);
#endif
#ifdef COLOR
mline_old.color = (unsigned char *)xrealloc((char *)mline_old.color, maxwidth);
# ifdef COLORS256
mline_old.colorx = (unsigned char *)xrealloc((char *)mline_old.colorx, maxwidth);
# endif
#endif
if (!(blank && null && mline_old.image && mline_old.attr IFFONT(&& mline_old.font) IFFONTX(&& mline_old.fontx) IFCOLOR(&& mline_old.color) IFCOLORX(&& mline_old.colorx)))
Panic(0, "%s", strnomem);
MakeBlankLine(blank, maxwidth);
bzero((char *)null, maxwidth);
mline_blank.image = blank;
mline_blank.attr = null;
mline_null.image = null;
mline_null.attr = null;
#ifdef FONT
mline_blank.font = null;
mline_null.font = null;
mline_blank.fontx = null;
mline_null.fontx = null;
#endif
#ifdef COLOR
mline_blank.color = null;
mline_null.color = null;
# ifdef COLORS256
mline_blank.colorx = null;
mline_null.colorx = null;
# endif
#endif
#define RESET_AFC(x, bl) do { if (x == old##bl) x = bl; } while (0)
#define RESET_LINES(lines, count) \
do { \
ml = lines; \
for (i = 0; i < count; i++, ml++) \
{ \
RESET_AFC(ml->image, blank); \
RESET_AFC(ml->attr, null); \
IFFONT(RESET_AFC(ml->font, null)); \
IFFONT(RESET_AFC(ml->fontx, null)); \
IFCOLOR(RESET_AFC(ml->color, null)); \
IFCOLORX(RESET_AFC(ml->colorx, null)); \
} \
} while (0)
/* We have to run through all windows to substitute
* the null and blank references.
*/
for (p = windows; p; p = p->w_next)
{
RESET_LINES(p->w_mlines, p->w_height);
#ifdef COPY_PASTE
RESET_LINES(p->w_hlines, p->w_histheight);
RESET_LINES(p->w_alt.hlines, p->w_alt.histheight);
#endif
RESET_LINES(p->w_alt.mlines, p->w_alt.height);
}
}
char *
xrealloc(mem, len)
char *mem;
int len;
{
register char *nmem;
if (mem == 0)
return malloc(len);
if ((nmem = realloc(mem, len)))
return nmem;
free(mem);
return (char *)0;
}
static void
MakeBlankLine(p, n)
register unsigned char *p;
register int n;
{
while (n--)
*p++ = ' ';
}
#ifdef COPY_PASTE
#define OLDWIN(y) ((y < p->w_histheight) \
? &p->w_hlines[(p->w_histidx + y) % p->w_histheight] \
: &p->w_mlines[y - p->w_histheight])
#define NEWWIN(y) ((y < hi) ? &nhlines[y] : &nmlines[y - hi])
#else
#define OLDWIN(y) (&p->w_mlines[y])
#define NEWWIN(y) (&nmlines[y])
#endif
int
ChangeWindowSize(p, wi, he, hi)
struct win *p;
int wi, he, hi;
{
struct mline *mlf = 0, *mlt = 0, *ml, *nmlines, *nhlines;
int fy, ty, l, lx, lf, lt, yy, oty, addone;
int ncx, ncy, naka, t;
int y, shift;
if (wi <= 0 || he <= 0)
wi = he = hi = 0;
if (p->w_type == W_TYPE_GROUP)
return 0;
if (wi > MAXWIDTH)
{
Msg(0, "Window width too large. Truncated to %d.", MAXWIDTH);
wi = MAXWIDTH;
}
if (he > MAXWIDTH)
{
Msg(0, "Window height too large. Truncated to %d.", MAXWIDTH);
he = MAXWIDTH;
}
if (p->w_width == wi && p->w_height == he && p->w_histheight == hi)
{
debug("ChangeWindowSize: No change.\n");
return 0;
}
CheckMaxSize(wi);
/* XXX */
#if 0
/* just in case ... */
if (wi && (p->w_width != wi || p->w_height != he) && p->w_lay != &p->w_winlay)
{
debug("ChangeWindowSize: No resize because of overlay?\n");
return -1;
}
#endif
debug("ChangeWindowSize");
debug3(" from (%d,%d)+%d", p->w_width, p->w_height, p->w_histheight);
debug3(" to(%d,%d)+%d\n", wi, he, hi);
fy = p->w_histheight + p->w_height - 1;
ty = hi + he - 1;
nmlines = nhlines = 0;
ncx = 0;
ncy = 0;
naka = 0;
if (wi)
{
if (wi != p->w_width || he != p->w_height)
{
if ((nmlines = (struct mline *)calloc(he, sizeof(struct mline))) == 0)
{
KillWindow(p);
Msg(0, "%s", strnomem);
return -1;
}
}
else
{
debug1("image stays the same: %d lines\n", he);
nmlines = p->w_mlines;
fy -= he;
ty -= he;
ncx = p->w_x;
ncy = p->w_y;
naka = p->w_autoaka;
}
}
#ifdef COPY_PASTE
if (hi)
{
if ((nhlines = (struct mline *)calloc(hi, sizeof(struct mline))) == 0)
{
Msg(0, "No memory for history buffer - turned off");
hi = 0;
ty = he - 1;
}
}
#endif
/* special case: cursor is at magic margin position */
addone = 0;
if (p->w_width && p->w_x == p->w_width)
{
debug2("Special addone case: %d %d\n", p->w_x, p->w_y);
addone = 1;
p->w_x--;
}
/* handle the cursor and autoaka lines now if the widths are equal */
if (p->w_width == wi)
{
ncx = p->w_x + addone;
ncy = p->w_y + he - p->w_height;
/* never lose sight of the line with the cursor on it */
shift = -ncy;
for (yy = p->w_y + p->w_histheight - 1; yy >= 0 && ncy + shift < he; yy--)
{
ml = OLDWIN(yy);
if (!ml->image)
break;
if (ml->image[p->w_width] == ' ')
break;
shift++;
}
if (shift < 0)
shift = 0;
else
debug1("resize: cursor out of bounds, shifting %d\n", shift);
ncy += shift;
if (p->w_autoaka > 0)
{
naka = p->w_autoaka + he - p->w_height + shift;
if (naka < 1 || naka > he)
naka = 0;
}
while (shift-- > 0)
{
ml = OLDWIN(fy);
FreeMline(ml);
fy--;
}
}
debug2("fy %d ty %d\n", fy, ty);
if (fy >= 0)
mlf = OLDWIN(fy);
if (ty >= 0)
mlt = NEWWIN(ty);
while (fy >= 0 && ty >= 0)
{
if (p->w_width == wi)
{
/* here is a simple shortcut: just copy over */
*mlt = *mlf;
*mlf = mline_zero;
if (--fy >= 0)
mlf = OLDWIN(fy);
if (--ty >= 0)
mlt = NEWWIN(ty);
continue;
}
/* calculate lenght */
for (l = p->w_width - 1; l > 0; l--)
if (mlf->image[l] != ' ' || mlf->attr[l])
break;
if (fy == p->w_y + p->w_histheight && l < p->w_x)
l = p->w_x; /* cursor is non blank */
l++;
lf = l;
/* add wrapped lines to length */
for (yy = fy - 1; yy >= 0; yy--)
{
ml = OLDWIN(yy);
if (ml->image[p->w_width] == ' ')
break;
l += p->w_width;
}
/* rewrap lines */
lt = (l - 1) % wi + 1; /* lf is set above */
oty = ty;
while (l > 0 && fy >= 0 && ty >= 0)
{
lx = lt > lf ? lf : lt;
if (mlt->image == 0)
{
if (AllocMline(mlt, wi + 1))
goto nomem;
MakeBlankLine(mlt->image + lt, wi - lt);
mlt->image[wi] = ((oty == ty) ? ' ' : 0);
}
if (BcopyMline(mlf, lf - lx, mlt, lt - lx, lx, wi + 1))
goto nomem;
/* did we copy the cursor ? */
if (fy == p->w_y + p->w_histheight && lf - lx <= p->w_x && lf > p->w_x)
{
ncx = p->w_x + lt - lf + addone;
ncy = ty - hi;
shift = wi ? -ncy + (l - lx) / wi : 0;
if (ty + shift > hi + he - 1)
shift = hi + he - 1 - ty;
if (shift > 0)
{
debug3("resize: cursor out of bounds, shifting %d [%d/%d]\n", shift, lt - lx, wi);
for (y = hi + he - 1; y >= ty; y--)
{
mlt = NEWWIN(y);
FreeMline(mlt);
if (y - shift < ty)
continue;
ml = NEWWIN(y - shift);
*mlt = *ml;
*ml = mline_zero;
}
ncy += shift;
ty += shift;
mlt = NEWWIN(ty);
if (naka > 0)
naka = naka + shift > he ? 0 : naka + shift;
}
ASSERT(ncy >= 0);
}
/* did we copy autoaka line ? */
if (p->w_autoaka > 0 && fy == p->w_autoaka - 1 + p->w_histheight && lf - lx <= 0)
naka = ty - hi >= 0 ? 1 + ty - hi : 0;
lf -= lx;
lt -= lx;
l -= lx;
if (lf == 0)
{
FreeMline(mlf);
lf = p->w_width;
if (--fy >= 0)
mlf = OLDWIN(fy);
}
if (lt == 0)
{
lt = wi;
if (--ty >= 0)
mlt = NEWWIN(ty);
}
}
ASSERT(l != 0 || fy == yy);
}
while (fy >= 0)
{
FreeMline(mlf);
if (--fy >= 0)
mlf = OLDWIN(fy);
}
while (ty >= 0)
{
if (AllocMline(mlt, wi + 1))
goto nomem;
MakeBlankLine(mlt->image, wi + 1);
if (--ty >= 0)
mlt = NEWWIN(ty);
}
#ifdef DEBUG
if (nmlines != p->w_mlines)
for (fy = 0; fy < p->w_height + p->w_histheight; fy++)
{
ml = OLDWIN(fy);
ASSERT(ml->image == 0);
}
#endif
if (p->w_mlines && p->w_mlines != nmlines)
free((char *)p->w_mlines);
p->w_mlines = nmlines;
#ifdef COPY_PASTE
if (p->w_hlines && p->w_hlines != nhlines)
free((char *)p->w_hlines);
p->w_hlines = nhlines;
#endif
nmlines = nhlines = 0;
/* change tabs */
if (p->w_width != wi)
{
if (wi)
{
t = p->w_tabs ? p->w_width : 0;
p->w_tabs = xrealloc(p->w_tabs, wi + 1);
if (p->w_tabs == 0)
goto nomem;
for (; t < wi; t++)
p->w_tabs[t] = t && !(t & 7) ? 1 : 0;
p->w_tabs[wi] = 0;
}
else
{
if (p->w_tabs)
free(p->w_tabs);
p->w_tabs = 0;
}
}
/* Change w_saved.y - this is only an estimate... */
p->w_saved.y += ncy - p->w_y;
p->w_x = ncx;
p->w_y = ncy;
if (p->w_autoaka > 0)
p->w_autoaka = naka;
/* do sanity checks */
if (p->w_x > wi)
p->w_x = wi;
if (p->w_y >= he)
p->w_y = he - 1;
if (p->w_saved.x > wi)
p->w_saved.x = wi;
if (p->w_saved.y >= he)
p->w_saved.y = he - 1;
if (p->w_saved.y < 0)
p->w_saved.y = 0;
if (p->w_alt.cursor.x > wi)
p->w_alt.cursor.x = wi;
if (p->w_alt.cursor.y >= he)
p->w_alt.cursor.y = he - 1;
if (p->w_alt.cursor.y < 0)
p->w_alt.cursor.y = 0;
/* reset scrolling region */
p->w_top = 0;
p->w_bot = he - 1;
/* signal new size to window */
#ifdef TIOCSWINSZ
if (wi && (p->w_width != wi || p->w_height != he)
&& p->w_width != 0 && p->w_height != 0 && p->w_ptyfd >= 0 && p->w_pid)
{
glwz.ws_col = wi;
glwz.ws_row = he;
debug("Setting pty winsize.\n");
if (ioctl(p->w_ptyfd, TIOCSWINSZ, (char *)&glwz))
debug2("SetPtySize: errno %d (fd:%d)\n", errno, p->w_ptyfd);
}
#endif /* TIOCSWINSZ */
/* store new size */
p->w_width = wi;
p->w_height = he;
if(p->w_scrollback_height > hi)
p->w_scrollback_height = hi;
#ifdef COPY_PASTE
p->w_histidx = 0;
p->w_histheight = hi;
#endif
#ifdef BUILTIN_TELNET
if (p->w_type == W_TYPE_TELNET)
TelWindowSize(p);
#endif
#ifdef DEBUG
/* Test if everything was ok */
for (fy = 0; fy < p->w_height + p->w_histheight; fy++)
{
ml = OLDWIN(fy);
ASSERT(ml->image);
# ifdef UTF8
if (p->w_encoding == UTF8)
{
for (l = 0; l < p->w_width; l++)
ASSERT(ml->image[l] >= ' ' || ml->font[l] || ml->fontx);
}
else
#endif
for (l = 0; l < p->w_width; l++)
ASSERT(ml->image[l] >= ' ');
}
#endif
return 0;
nomem:
if (nmlines || nhlines)
{
for (ty = he + hi - 1; ty >= 0; ty--)
{
mlt = NEWWIN(ty);
FreeMline(mlt);
}
if (nmlines && p->w_mlines != nmlines)
free((char *)nmlines);
#ifdef COPY_PASTE
if (nhlines && p->w_hlines != nhlines)
free((char *)nhlines);
#endif
}
KillWindow(p);
Msg(0, "%s", strnomem);
return -1;
}
void
FreeAltScreen(p)
struct win *p;
{
int i;
if (p->w_alt.mlines)
{
for (i = 0; i < p->w_alt.height; i++)
FreeMline(p->w_alt.mlines + i);
free(p->w_alt.mlines);
}
p->w_alt.mlines = 0;
p->w_alt.width = 0;
p->w_alt.height = 0;
#ifdef COPY_PASTE
if (p->w_alt.hlines)
{
for (i = 0; i < p->w_alt.histheight; i++)
FreeMline(p->w_alt.hlines + i);
free(p->w_alt.hlines);
}
p->w_alt.hlines = 0;
p->w_alt.histidx = 0;
p->w_alt.histheight = 0;
#endif
}
static void
SwapAltScreen(p)
struct win *p;
{
struct mline *ml;
int t;
#define SWAP(item, t) do { (t) = p->w_alt. item; p->w_alt. item = p->w_##item; p->w_##item = (t); } while (0)
SWAP(mlines, ml);
SWAP(width, t);
SWAP(height, t);
#ifdef COPY_PASTE
SWAP(histheight, t);
SWAP(hlines, ml);
SWAP(histidx, t);
#endif
#undef SWAP
}
void
EnterAltScreen(p)
struct win *p;
{
if (!p->w_alt.on)
{
/* If not already using the alternate screen buffer, then create
a new one and swap it with the 'real' screen buffer. */
FreeAltScreen(p);
SwapAltScreen(p);
}
else
{
/* Already using the alternate buffer. Just clear the screen. To do so, it
is only necessary to reset the height(s) without resetting the width. */
p->w_height = 0;
p->w_histheight = 0;
}
ChangeWindowSize(p, p->w_alt.width, p->w_alt.height, p->w_alt.histheight);
p->w_alt.on = 1;
}
void
LeaveAltScreen(p)
struct win *p;
{
if (!p->w_alt.on)
return;
SwapAltScreen(p);
ChangeWindowSize(p, p->w_alt.width, p->w_alt.height, p->w_alt.histheight);
FreeAltScreen(p);
p->w_alt.on = 0;
}
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