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/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "$Id: vs_split.c,v 10.42 2001/06/25 15:19:38 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:38 $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../common/common.h"
#include "vi.h"
typedef enum { HORIZ_FOLLOW, HORIZ_PRECEDE, VERT_FOLLOW, VERT_PRECEDE } jdir_t;
static SCR *vs_getbg __P((SCR *, char *));
static void vs_insert __P((SCR *sp, WIN *wp));
static int vs_join __P((SCR *, SCR **, jdir_t *));
/*
* vs_split --
* Create a new screen, horizontally.
*
* PUBLIC: int vs_split __P((SCR *, SCR *, int));
*/
int
vs_split(SCR *sp, SCR *new, int ccl)
/* Colon-command line split. */
{
GS *gp;
SMAP *smp;
size_t half;
int issmallscreen, splitup;
gp = sp->gp;
/* Check to see if it's possible. */
/* XXX: The IS_ONELINE fix will change this, too. */
if (sp->rows < 4) {
msgq(sp, M_ERR,
"222|Screen must be larger than %d lines to split", 4 - 1);
return (1);
}
/* Wait for any messages in the screen. */
vs_resolve(sp, NULL, 1);
/* Get a new screen map. */
CALLOC(sp, _HMAP(new), SMAP *, SIZE_HMAP(sp), sizeof(SMAP));
if (_HMAP(new) == NULL)
return (1);
_HMAP(new)->lno = sp->lno;
_HMAP(new)->coff = 0;
_HMAP(new)->soff = 1;
/* Split the screen in half. */
half = sp->rows / 2;
if (ccl && half > 6)
half = 6;
/*
* Small screens: see vs_refresh.c section 6a. Set a flag so
* we know to fix the screen up later.
*/
issmallscreen = IS_SMALL(sp);
/* The columns in the screen don't change. */
new->coff = sp->coff;
new->cols = sp->cols;
/*
* Split the screen, and link the screens together. If creating a
* screen to edit the colon command line or the cursor is in the top
* half of the current screen, the new screen goes under the current
* screen. Else, it goes above the current screen.
*
* Recalculate current cursor position based on sp->lno, we're called
* with the cursor on the colon command line. Then split the screen
* in half and update the shared information.
*/
splitup =
!ccl && (vs_sm_cursor(sp, &smp) ? 0 : (smp - HMAP) + 1) >= half;
if (splitup) { /* Old is bottom half. */
new->rows = sp->rows - half; /* New. */
new->roff = sp->roff;
sp->rows = half; /* Old. */
sp->roff += new->rows;
/*
* If the parent is the bottom half of the screen, shift
* the map down to match on-screen text.
*/
memcpy(_HMAP(sp), _HMAP(sp) + new->rows,
(sp->t_maxrows - new->rows) * sizeof(SMAP));
} else { /* Old is top half. */
new->rows = half; /* New. */
sp->rows -= half; /* Old. */
new->roff = sp->roff + sp->rows;
}
/* Adjust maximum text count. */
sp->t_maxrows = IS_ONELINE(sp) ? 1 : sp->rows - 1;
new->t_maxrows = IS_ONELINE(new) ? 1 : new->rows - 1;
/*
* Small screens: see vs_refresh.c, section 6a.
*
* The child may have different screen options sizes than the parent,
* so use them. Guarantee that text counts aren't larger than the
* new screen sizes.
*/
if (issmallscreen) {
/* Fix the text line count for the parent. */
if (splitup)
sp->t_rows -= new->rows;
/* Fix the parent screen. */
if (sp->t_rows > sp->t_maxrows)
sp->t_rows = sp->t_maxrows;
if (sp->t_minrows > sp->t_maxrows)
sp->t_minrows = sp->t_maxrows;
/* Fix the child screen. */
new->t_minrows = new->t_rows = O_VAL(sp, O_WINDOW);
if (new->t_rows > new->t_maxrows)
new->t_rows = new->t_maxrows;
if (new->t_minrows > new->t_maxrows)
new->t_minrows = new->t_maxrows;
} else {
sp->t_minrows = sp->t_rows = IS_ONELINE(sp) ? 1 : sp->rows - 1;
/*
* The new screen may be a small screen, even if the parent
* was not. Don't complain if O_WINDOW is too large, we're
* splitting the screen so the screen is much smaller than
* normal.
*/
new->t_minrows = new->t_rows = O_VAL(sp, O_WINDOW);
if (new->t_rows > new->rows - 1)
new->t_minrows = new->t_rows =
IS_ONELINE(new) ? 1 : new->rows - 1;
}
/* Adjust the ends of the new and old maps. */
_TMAP(sp) = IS_ONELINE(sp) ?
_HMAP(sp) : _HMAP(sp) + (sp->t_rows - 1);
_TMAP(new) = IS_ONELINE(new) ?
_HMAP(new) : _HMAP(new) + (new->t_rows - 1);
/* Reset the length of the default scroll. */
if ((sp->defscroll = sp->t_maxrows / 2) == 0)
sp->defscroll = 1;
if ((new->defscroll = new->t_maxrows / 2) == 0)
new->defscroll = 1;
/* Fit the screen into the logical chain. */
vs_insert(new, sp->wp);
/* Tell the display that we're splitting. */
(void)gp->scr_split(sp, new);
/*
* Initialize the screen flags:
*
* If we're in vi mode in one screen, we don't have to reinitialize.
* This isn't just a cosmetic fix. The path goes like this:
*
* return into vi(), SC_SSWITCH set
* call vs_refresh() with SC_STATUS set
* call vs_resolve to display the status message
* call vs_refresh() because the SC_SCR_VI bit isn't set
*
* Things go downhill at this point.
*
* Draw the new screen from scratch, and add a status line.
*/
F_SET(new,
SC_SCR_REFORMAT | SC_STATUS |
F_ISSET(sp, SC_EX | SC_VI | SC_SCR_VI | SC_SCR_EX));
return (0);
}
/*
* vs_vsplit --
* Create a new screen, vertically.
*
* PUBLIC: int vs_vsplit __P((SCR *, SCR *));
*/
int
vs_vsplit(SCR *sp, SCR *new)
{
GS *gp;
size_t cols;
gp = sp->gp;
/* Check to see if it's possible. */
if (sp->cols / 2 <= MINIMUM_SCREEN_COLS) {
msgq(sp, M_ERR,
"288|Screen must be larger than %d columns to split",
MINIMUM_SCREEN_COLS * 2);
return (1);
}
/* Wait for any messages in the screen. */
vs_resolve(sp, NULL, 1);
/* Get a new screen map. */
CALLOC(sp, _HMAP(new), SMAP *, SIZE_HMAP(sp), sizeof(SMAP));
if (_HMAP(new) == NULL)
return (1);
_HMAP(new)->lno = sp->lno;
_HMAP(new)->coff = 0;
_HMAP(new)->soff = 1;
/*
* Split the screen in half; we have to sacrifice a column to delimit
* the screens.
*
* XXX
* We always split to the right... that makes more sense to me, and
* I don't want to play the stupid games that I play when splitting
* horizontally.
*
* XXX
* We reserve a column for the screen, "knowing" that curses needs
* one. This should be worked out with the display interface.
*/
cols = sp->cols / 2;
new->cols = sp->cols - cols - 1;
sp->cols = cols;
new->coff = sp->coff + cols + 1;
sp->cno = 0;
/* Nothing else changes. */
new->rows = sp->rows;
new->t_rows = sp->t_rows;
new->t_maxrows = sp->t_maxrows;
new->t_minrows = sp->t_minrows;
new->roff = sp->roff;
new->defscroll = sp->defscroll;
_TMAP(new) = _HMAP(new) + (new->t_rows - 1);
/* Fit the screen into the logical chain. */
vs_insert(new, sp->wp);
/* Tell the display that we're splitting. */
(void)gp->scr_split(sp, new);
/* Redraw the old screen from scratch. */
F_SET(sp, SC_SCR_REFORMAT | SC_STATUS);
/*
* Initialize the screen flags:
*
* If we're in vi mode in one screen, we don't have to reinitialize.
* This isn't just a cosmetic fix. The path goes like this:
*
* return into vi(), SC_SSWITCH set
* call vs_refresh() with SC_STATUS set
* call vs_resolve to display the status message
* call vs_refresh() because the SC_SCR_VI bit isn't set
*
* Things go downhill at this point.
*
* Draw the new screen from scratch, and add a status line.
*/
F_SET(new,
SC_SCR_REFORMAT | SC_STATUS |
F_ISSET(sp, SC_EX | SC_VI | SC_SCR_VI | SC_SCR_EX));
return (0);
}
/*
* vs_insert --
* Insert the new screen into the correct place in the logical
* chain.
*/
static void
vs_insert(SCR *sp, WIN *wp)
{
GS *gp;
SCR *tsp;
gp = sp->gp;
sp->wp = wp;
/* Move past all screens with lower row numbers. */
for (tsp = wp->scrq.cqh_first;
tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next)
if (tsp->roff >= sp->roff)
break;
/*
* Move past all screens with the same row number and lower
* column numbers.
*/
for (; tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next)
if (tsp->roff != sp->roff || tsp->coff > sp->coff)
break;
/*
* If we reached the end, this screen goes there. Otherwise,
* put it before or after the screen where we stopped.
*/
if (tsp == (void *)&wp->scrq) {
CIRCLEQ_INSERT_TAIL(&wp->scrq, sp, q);
} else if (tsp->roff < sp->roff ||
(tsp->roff == sp->roff && tsp->coff < sp->coff)) {
CIRCLEQ_INSERT_AFTER(&wp->scrq, tsp, sp, q);
} else
CIRCLEQ_INSERT_BEFORE(&wp->scrq, tsp, sp, q);
}
/*
* vs_discard --
* Discard the screen, folding the real-estate into a related screen,
* if one exists, and return that screen.
*
* PUBLIC: int vs_discard __P((SCR *, SCR **));
*/
int
vs_discard(SCR *sp, SCR **spp)
{
GS *gp;
SCR *tsp, **lp, *list[100];
jdir_t jdir;
gp = sp->gp;
/*
* Save the old screen's cursor information.
*
* XXX
* If called after file_end(), and the underlying file was a tmp
* file, it may have gone away.
*/
if (sp->frp != NULL) {
sp->frp->lno = sp->lno;
sp->frp->cno = sp->cno;
F_SET(sp->frp, FR_CURSORSET);
}
/* If no other screens to join, we're done. */
if (!IS_SPLIT(sp)) {
(void)gp->scr_discard(sp, NULL);
if (spp != NULL)
*spp = NULL;
return (0);
}
/*
* Find a set of screens that cover one of the screen's borders.
* Check the vertical axis first, for no particular reason.
*
* XXX
* It's possible (I think?), to create a screen that shares no full
* border with any other set of screens, so we can't discard it. We
* just complain at the user until they clean it up.
*/
if (vs_join(sp, list, &jdir))
return (1);
/*
* Modify the affected screens. Redraw the modified screen(s) from
* scratch, setting a status line. If this is ever a performance
* problem we could play games with the map, but I wrote that code
* before and it was never clean or easy.
*
* Don't clean up the discarded screen's information. If the screen
* isn't exiting, we'll do the work when the user redisplays it.
*/
switch (jdir) {
case HORIZ_FOLLOW:
case HORIZ_PRECEDE:
for (lp = &list[0]; (tsp = *lp) != NULL; ++lp) {
/*
* Small screens: see vs_refresh.c section 6a. Adjust
* text line info, unless it's a small screen.
*
* Reset the length of the default scroll.
*
* Reset the map references.
*/
tsp->rows += sp->rows;
if (!IS_SMALL(tsp))
tsp->t_rows = tsp->t_minrows = tsp->rows - 1;
tsp->t_maxrows = tsp->rows - 1;
tsp->defscroll = tsp->t_maxrows / 2;
*(_HMAP(tsp) + (tsp->t_rows - 1)) = *_TMAP(tsp);
_TMAP(tsp) = _HMAP(tsp) + (tsp->t_rows - 1);
switch (jdir) {
case HORIZ_FOLLOW:
tsp->roff = sp->roff;
vs_sm_fill(tsp, OOBLNO, P_TOP);
break;
case HORIZ_PRECEDE:
vs_sm_fill(tsp, OOBLNO, P_BOTTOM);
break;
default:
abort();
}
F_SET(tsp, SC_STATUS);
}
break;
case VERT_FOLLOW:
case VERT_PRECEDE:
for (lp = &list[0]; (tsp = *lp) != NULL; ++lp) {
if (jdir == VERT_FOLLOW)
tsp->coff = sp->coff;
tsp->cols += sp->cols + 1; /* XXX: DIVIDER */
vs_sm_fill(tsp, OOBLNO, P_TOP);
F_SET(tsp, SC_STATUS);
}
break;
default:
abort();
}
/* Find the closest screen that changed and move to it. */
tsp = list[0];
if (spp != NULL)
*spp = tsp;
/* Tell the display that we're discarding a screen. */
(void)gp->scr_discard(sp, list);
return (0);
}
/*
* vs_join --
* Find a set of screens that covers a screen's border.
*/
static int
vs_join(SCR *sp, SCR **listp, jdir_t *jdirp)
{
GS *gp;
WIN *wp;
SCR **lp, *tsp;
int first;
size_t tlen;
gp = sp->gp;
wp = sp->wp;
/* Check preceding vertical. */
for (lp = listp, tlen = sp->rows,
tsp = wp->scrq.cqh_first;
tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next) {
if (sp == tsp)
continue;
/* Test if precedes the screen vertically. */
if (tsp->coff + tsp->cols + 1 != sp->coff)
continue;
/*
* Test if a subset on the vertical axis. If overlaps the
* beginning or end, we can't join on this axis at all.
*/
if (tsp->roff > sp->roff + sp->rows)
continue;
if (tsp->roff < sp->roff) {
if (tsp->roff + tsp->rows >= sp->roff)
break;
continue;
}
if (tsp->roff + tsp->rows > sp->roff + sp->rows)
break;
#ifdef DEBUG
if (tlen < tsp->rows)
abort();
#endif
tlen -= tsp->rows;
*lp++ = tsp;
}
if (tlen == 0) {
*lp = NULL;
*jdirp = VERT_PRECEDE;
return (0);
}
/* Check following vertical. */
for (lp = listp, tlen = sp->rows,
tsp = wp->scrq.cqh_first;
tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next) {
if (sp == tsp)
continue;
/* Test if follows the screen vertically. */
if (tsp->coff != sp->coff + sp->cols + 1)
continue;
/*
* Test if a subset on the vertical axis. If overlaps the
* beginning or end, we can't join on this axis at all.
*/
if (tsp->roff > sp->roff + sp->rows)
continue;
if (tsp->roff < sp->roff) {
if (tsp->roff + tsp->rows >= sp->roff)
break;
continue;
}
if (tsp->roff + tsp->rows > sp->roff + sp->rows)
break;
#ifdef DEBUG
if (tlen < tsp->rows)
abort();
#endif
tlen -= tsp->rows;
*lp++ = tsp;
}
if (tlen == 0) {
*lp = NULL;
*jdirp = VERT_FOLLOW;
return (0);
}
/* Check preceding horizontal. */
for (first = 0, lp = listp, tlen = sp->cols,
tsp = wp->scrq.cqh_first;
tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next) {
if (sp == tsp)
continue;
/* Test if precedes the screen horizontally. */
if (tsp->roff + tsp->rows != sp->roff)
continue;
/*
* Test if a subset on the horizontal axis. If overlaps the
* beginning or end, we can't join on this axis at all.
*/
if (tsp->coff > sp->coff + sp->cols)
continue;
if (tsp->coff < sp->coff) {
if (tsp->coff + tsp->cols >= sp->coff)
break;
continue;
}
if (tsp->coff + tsp->cols > sp->coff + sp->cols)
break;
#ifdef DEBUG
if (tlen < tsp->cols)
abort();
#endif
tlen -= tsp->cols + first;
first = 1;
*lp++ = tsp;
}
if (tlen == 0) {
*lp = NULL;
*jdirp = HORIZ_PRECEDE;
return (0);
}
/* Check following horizontal. */
for (first = 0, lp = listp, tlen = sp->cols,
tsp = wp->scrq.cqh_first;
tsp != (void *)&wp->scrq; tsp = tsp->q.cqe_next) {
if (sp == tsp)
continue;
/* Test if precedes the screen horizontally. */
if (tsp->roff != sp->roff + sp->rows)
continue;
/*
* Test if a subset on the horizontal axis. If overlaps the
* beginning or end, we can't join on this axis at all.
*/
if (tsp->coff > sp->coff + sp->cols)
continue;
if (tsp->coff < sp->coff) {
if (tsp->coff + tsp->cols >= sp->coff)
break;
continue;
}
if (tsp->coff + tsp->cols > sp->coff + sp->cols)
break;
#ifdef DEBUG
if (tlen < tsp->cols)
abort();
#endif
tlen -= tsp->cols + first;
first = 1;
*lp++ = tsp;
}
if (tlen == 0) {
*lp = NULL;
*jdirp = HORIZ_FOLLOW;
return (0);
}
return (1);
}
/*
* vs_fg --
* Background the current screen, and foreground a new one.
*
* PUBLIC: int vs_fg __P((SCR *, SCR **, CHAR_T *, int));
*/
int
vs_fg(SCR *sp, SCR **nspp, CHAR_T *name, int newscreen)
{
GS *gp;
WIN *wp;
SCR *nsp;
char *np;
size_t nlen;
gp = sp->gp;
wp = sp->wp;
if (name)
INT2CHAR(sp, name, STRLEN(name) + 1, np, nlen);
else
np = NULL;
if (newscreen)
/* Get the specified background screen. */
nsp = vs_getbg(sp, np);
else
/* Swap screens. */
if (vs_swap(sp, &nsp, np))
return (1);
if ((*nspp = nsp) == NULL) {
msgq_wstr(sp, M_ERR, name,
name == NULL ?
"223|There are no background screens" :
"224|There's no background screen editing a file named %s");
return (1);
}
if (newscreen) {
/* Remove the new screen from the background queue. */
CIRCLEQ_REMOVE(&gp->hq, nsp, q);
/* Split the screen; if we fail, hook the screen back in. */
if (vs_split(sp, nsp, 0)) {
CIRCLEQ_INSERT_TAIL(&gp->hq, nsp, q);
return (1);
}
} else {
/* Move the old screen to the background queue. */
CIRCLEQ_REMOVE(&wp->scrq, sp, q);
CIRCLEQ_INSERT_TAIL(&gp->hq, sp, q);
}
return (0);
}
/*
* vs_bg --
* Background the screen, and switch to the next one.
*
* PUBLIC: int vs_bg __P((SCR *));
*/
int
vs_bg(SCR *sp)
{
GS *gp;
WIN *wp;
SCR *nsp;
gp = sp->gp;
wp = sp->wp;
/* Try and join with another screen. */
if (vs_discard(sp, &nsp))
return (1);
if (nsp == NULL) {
msgq(sp, M_ERR,
"225|You may not background your only displayed screen");
return (1);
}
/* Move the old screen to the background queue. */
CIRCLEQ_REMOVE(&wp->scrq, sp, q);
CIRCLEQ_INSERT_TAIL(&gp->hq, sp, q);
/* Toss the screen map. */
free(_HMAP(sp));
_HMAP(sp) = NULL;
/* Switch screens. */
sp->nextdisp = nsp;
F_SET(sp, SC_SSWITCH);
return (0);
}
/*
* vs_swap --
* Swap the current screen with a backgrounded one.
*
* PUBLIC: int vs_swap __P((SCR *, SCR **, char *));
*/
int
vs_swap(SCR *sp, SCR **nspp, char *name)
{
GS *gp;
WIN *wp;
SCR *nsp, *list[2];
gp = sp->gp;
wp = sp->wp;
/* Get the specified background screen. */
if ((*nspp = nsp = vs_getbg(sp, name)) == NULL)
return (0);
/*
* Save the old screen's cursor information.
*
* XXX
* If called after file_end(), and the underlying file was a tmp
* file, it may have gone away.
*/
if (sp->frp != NULL) {
sp->frp->lno = sp->lno;
sp->frp->cno = sp->cno;
F_SET(sp->frp, FR_CURSORSET);
}
/* Switch screens. */
sp->nextdisp = nsp;
F_SET(sp, SC_SSWITCH);
/* Initialize terminal information. */
VIP(nsp)->srows = VIP(sp)->srows;
/* Initialize screen information. */
nsp->cols = sp->cols;
nsp->rows = sp->rows; /* XXX: Only place in vi that sets rows. */
nsp->roff = sp->roff;
/*
* Small screens: see vs_refresh.c, section 6a.
*
* The new screens may have different screen options sizes than the
* old one, so use them. Make sure that text counts aren't larger
* than the new screen sizes.
*/
if (IS_SMALL(nsp)) {
nsp->t_minrows = nsp->t_rows = O_VAL(nsp, O_WINDOW);
if (nsp->t_rows > sp->t_maxrows)
nsp->t_rows = nsp->t_maxrows;
if (nsp->t_minrows > sp->t_maxrows)
nsp->t_minrows = nsp->t_maxrows;
} else
nsp->t_rows = nsp->t_maxrows = nsp->t_minrows = nsp->rows - 1;
/* Reset the length of the default scroll. */
nsp->defscroll = nsp->t_maxrows / 2;
/* Allocate a new screen map. */
CALLOC_RET(nsp, _HMAP(nsp), SMAP *, SIZE_HMAP(nsp), sizeof(SMAP));
_TMAP(nsp) = _HMAP(nsp) + (nsp->t_rows - 1);
/* Fill the map. */
nsp->wp = sp->wp;
if (vs_sm_fill(nsp, nsp->lno, P_FILL))
return (1);
/*
* The new screen replaces the old screen in the parent/child list.
* We insert the new screen after the old one. If we're exiting,
* the exit will delete the old one, if we're foregrounding, the fg
* code will move the old one to the background queue.
*/
CIRCLEQ_REMOVE(&gp->hq, nsp, q);
CIRCLEQ_INSERT_AFTER(&wp->scrq, sp, nsp, q);
/*
* Don't change the screen's cursor information other than to
* note that the cursor is wrong.
*/
F_SET(VIP(nsp), VIP_CUR_INVALID);
/* Draw the new screen from scratch, and add a status line. */
F_SET(nsp, SC_SCR_REDRAW | SC_STATUS);
list[0] = nsp; list[1] = NULL;
(void)gp->scr_discard(sp, list);
return (0);
}
/*
* vs_resize --
* Change the absolute size of the current screen.
*
* PUBLIC: int vs_resize __P((SCR *, long, adj_t));
*/
int
vs_resize(SCR *sp, long int count, adj_t adj)
{
GS *gp;
WIN *wp;
SCR *g, *s, *prev, *next, *list[3] = {NULL, NULL, NULL};
size_t g_off, s_off;
gp = sp->gp;
wp = sp->wp;
/*
* Figure out which screens will grow, which will shrink, and
* make sure it's possible.
*/
if (count == 0)
return (0);
if (adj == A_SET) {
if (sp->t_maxrows == count)
return (0);
if (sp->t_maxrows > count) {
adj = A_DECREASE;
count = sp->t_maxrows - count;
} else {
adj = A_INCREASE;
count = count - sp->t_maxrows;
}
}
/* Find first overlapping screen */
for (next = sp->q.cqe_next;
next != (void *)&wp->scrq &&
(next->coff >= sp->coff + sp->cols ||
next->coff + next->cols <= sp->coff);
next = next->q.cqe_next);
/* See if we can use it */
if (next != (void *)&wp->scrq &&
(sp->coff != next->coff || sp->cols != next->cols))
next = (void *)&wp->scrq;
for (prev = sp->q.cqe_prev;
prev != (void *)&wp->scrq &&
(prev->coff >= sp->coff + sp->cols ||
prev->coff + prev->cols <= sp->coff);
prev = prev->q.cqe_prev);
if (prev != (void *)&wp->scrq &&
(sp->coff != prev->coff || sp->cols != prev->cols))
prev = (void *)&wp->scrq;
g_off = s_off = 0;
if (adj == A_DECREASE) {
if (count < 0)
count = -count;
s = sp;
if (s->t_maxrows < MINIMUM_SCREEN_ROWS + count)
goto toosmall;
if ((g = prev) == (void *)&wp->scrq) {
if ((g = next) == (void *)&wp->scrq)
goto toobig;
g_off = -count;
} else
s_off = count;
} else {
g = sp;
if ((s = next) != (void *)&wp->scrq &&
s->t_maxrows >= MINIMUM_SCREEN_ROWS + count)
s_off = count;
else
s = NULL;
if (s == NULL) {
if ((s = prev) == (void *)&wp->scrq) {
toobig: msgq(sp, M_BERR, adj == A_DECREASE ?
"227|The screen cannot shrink" :
"228|The screen cannot grow");
return (1);
}
if (s->t_maxrows < MINIMUM_SCREEN_ROWS + count) {
toosmall: msgq(sp, M_BERR,
"226|The screen can only shrink to %d rows",
MINIMUM_SCREEN_ROWS);
return (1);
}
g_off = -count;
}
}
/*
* Fix up the screens; we could optimize the reformatting of the
* screen, but this isn't likely to be a common enough operation
* to make it worthwhile.
*/
s->rows += -count;
s->roff += s_off;
g->rows += count;
g->roff += g_off;
g->t_rows += count;
if (g->t_minrows == g->t_maxrows)
g->t_minrows += count;
g->t_maxrows += count;
_TMAP(g) += count;
F_SET(g, SC_SCR_REFORMAT | SC_STATUS);
s->t_rows -= count;
s->t_maxrows -= count;
if (s->t_minrows > s->t_maxrows)
s->t_minrows = s->t_maxrows;
_TMAP(s) -= count;
F_SET(s, SC_SCR_REFORMAT | SC_STATUS);
/* XXXX */
list[0] = g; list[1] = s;
gp->scr_discard(0, list);
return (0);
}
/*
* vs_getbg --
* Get the specified background screen, or, if name is NULL, the first
* background screen.
*/
static SCR *
vs_getbg(SCR *sp, char *name)
{
GS *gp;
SCR *nsp;
char *p;
gp = sp->gp;
/* If name is NULL, return the first background screen on the list. */
if (name == NULL) {
nsp = gp->hq.cqh_first;
return (nsp == (void *)&gp->hq ? NULL : nsp);
}
/* Search for a full match. */
for (nsp = gp->hq.cqh_first;
nsp != (void *)&gp->hq; nsp = nsp->q.cqe_next)
if (!strcmp(nsp->frp->name, name))
break;
if (nsp != (void *)&gp->hq)
return (nsp);
/* Search for a last-component match. */
for (nsp = gp->hq.cqh_first;
nsp != (void *)&gp->hq; nsp = nsp->q.cqe_next) {
if ((p = strrchr(nsp->frp->name, '/')) == NULL)
p = nsp->frp->name;
else
++p;
if (!strcmp(p, name))
break;
}
if (nsp != (void *)&gp->hq)
return (nsp);
return (NULL);
}
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