| Current Path : /usr/src/contrib/nvi/vi/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/nvi/vi/vs_refresh.c |
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
#if 0
static const char sccsid[] = "@(#)vs_refresh.c 10.44 (Berkeley) 10/13/96";
#endif
static const char rcsid[] =
"$FreeBSD: release/9.1.0/contrib/nvi/vi/vs_refresh.c 79950 2001-07-19 11:02:11Z dd $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../common/common.h"
#include "vi.h"
#define UPDATE_CURSOR 0x01 /* Update the cursor. */
#define UPDATE_SCREEN 0x02 /* Flush to screen. */
static void vs_modeline __P((SCR *));
static int vs_paint __P((SCR *, u_int));
/*
* v_repaint --
* Repaint selected lines from the screen.
*
* PUBLIC: int vs_repaint __P((SCR *, EVENT *));
*/
int
vs_repaint(sp, evp)
SCR *sp;
EVENT *evp;
{
SMAP *smp;
for (; evp->e_flno <= evp->e_tlno; ++evp->e_flno) {
smp = HMAP + evp->e_flno - 1;
SMAP_FLUSH(smp);
if (vs_line(sp, smp, NULL, NULL))
return (1);
}
return (0);
}
/*
* vs_refresh --
* Refresh all screens.
*
* PUBLIC: int vs_refresh __P((SCR *, int));
*/
int
vs_refresh(sp, forcepaint)
SCR *sp;
int forcepaint;
{
GS *gp;
SCR *tsp;
int need_refresh;
u_int priv_paint, pub_paint;
gp = sp->gp;
/*
* 1: Refresh the screen.
*
* If SC_SCR_REDRAW is set in the current screen, repaint everything
* that we can find, including status lines.
*/
if (F_ISSET(sp, SC_SCR_REDRAW))
for (tsp = gp->dq.cqh_first;
tsp != (void *)&gp->dq; tsp = tsp->q.cqe_next)
if (tsp != sp)
F_SET(tsp, SC_SCR_REDRAW | SC_STATUS);
/*
* 2: Related or dirtied screens, or screens with messages.
*
* If related screens share a view into a file, they may have been
* modified as well. Refresh any screens that aren't exiting that
* have paint or dirty bits set. Always update their screens, we
* are not likely to get another chance. Finally, if we refresh any
* screens other than the current one, the cursor will be trashed.
*/
pub_paint = SC_SCR_REFORMAT | SC_SCR_REDRAW;
priv_paint = VIP_CUR_INVALID | VIP_N_REFRESH;
if (O_ISSET(sp, O_NUMBER))
priv_paint |= VIP_N_RENUMBER;
for (tsp = gp->dq.cqh_first;
tsp != (void *)&gp->dq; tsp = tsp->q.cqe_next)
if (tsp != sp && !F_ISSET(tsp, SC_EXIT | SC_EXIT_FORCE) &&
(F_ISSET(tsp, pub_paint) ||
F_ISSET(VIP(tsp), priv_paint))) {
(void)vs_paint(tsp,
(F_ISSET(VIP(tsp), VIP_CUR_INVALID) ?
UPDATE_CURSOR : 0) | UPDATE_SCREEN);
F_SET(VIP(sp), VIP_CUR_INVALID);
}
/*
* 3: Refresh the current screen.
*
* Always refresh the current screen, it may be a cursor movement.
* Also, always do it last -- that way, SC_SCR_REDRAW can be set
* in the current screen only, and the screen won't flash.
*/
if (vs_paint(sp, UPDATE_CURSOR | (!forcepaint &&
F_ISSET(sp, SC_SCR_VI) && KEYS_WAITING(sp) ? 0 : UPDATE_SCREEN)))
return (1);
/*
* 4: Paint any missing status lines.
*
* XXX
* This is fairly evil. Status lines are written using the vi message
* mechanism, since we have no idea how long they are. Since we may be
* painting screens other than the current one, we don't want to make
* the user wait. We depend heavily on there not being any other lines
* currently waiting to be displayed and the message truncation code in
* the msgq_status routine working.
*
* And, finally, if we updated any status lines, make sure the cursor
* gets back to where it belongs.
*/
for (need_refresh = 0, tsp = gp->dq.cqh_first;
tsp != (void *)&gp->dq; tsp = tsp->q.cqe_next)
if (F_ISSET(tsp, SC_STATUS)) {
need_refresh = 1;
vs_resolve(tsp, sp, 0);
}
if (need_refresh)
(void)gp->scr_refresh(sp, 0);
/*
* A side-effect of refreshing the screen is that it's now ready
* for everything else, i.e. messages.
*/
F_SET(sp, SC_SCR_VI);
return (0);
}
/*
* vs_paint --
* This is the guts of the vi curses screen code. The idea is that
* the SCR structure passed in contains the new coordinates of the
* screen. What makes this hard is that we don't know how big
* characters are, doing input can put the cursor in illegal places,
* and we're frantically trying to avoid repainting unless it's
* absolutely necessary. If you change this code, you'd better know
* what you're doing. It's subtle and quick to anger.
*/
static int
vs_paint(sp, flags)
SCR *sp;
u_int flags;
{
GS *gp;
SMAP *smp, tmp;
VI_PRIVATE *vip;
recno_t lastline, lcnt;
size_t cwtotal, cnt, len, notused, off, y;
int ch, didpaint, isempty, leftright_warp;
char *p;
#define LNO sp->lno /* Current file line. */
#define OLNO vip->olno /* Remembered file line. */
#define CNO sp->cno /* Current file column. */
#define OCNO vip->ocno /* Remembered file column. */
#define SCNO vip->sc_col /* Current screen column. */
gp = sp->gp;
vip = VIP(sp);
didpaint = leftright_warp = 0;
/*
* 5: Reformat the lines.
*
* If the lines themselves have changed (:set list, for example),
* fill in the map from scratch. Adjust the screen that's being
* displayed if the leftright flag is set.
*/
if (F_ISSET(sp, SC_SCR_REFORMAT)) {
/* Invalidate the line size cache. */
VI_SCR_CFLUSH(vip);
/* Toss vs_line() cached information. */
if (F_ISSET(sp, SC_SCR_TOP)) {
if (vs_sm_fill(sp, LNO, P_TOP))
return (1);
}
else if (F_ISSET(sp, SC_SCR_CENTER)) {
if (vs_sm_fill(sp, LNO, P_MIDDLE))
return (1);
} else
if (vs_sm_fill(sp, OOBLNO, P_TOP))
return (1);
F_SET(sp, SC_SCR_REDRAW);
}
/*
* 6: Line movement.
*
* Line changes can cause the top line to change as well. As
* before, if the movement is large, the screen is repainted.
*
* 6a: Small screens.
*
* Users can use the window, w300, w1200 and w9600 options to make
* the screen artificially small. The behavior of these options
* in the historic vi wasn't all that consistent, and, in fact, it
* was never documented how various screen movements affected the
* screen size. Generally, one of three things would happen:
* 1: The screen would expand in size, showing the line
* 2: The screen would scroll, showing the line
* 3: The screen would compress to its smallest size and
* repaint.
* In general, scrolling didn't cause compression (200^D was handled
* the same as ^D), movement to a specific line would (:N where N
* was 1 line below the screen caused a screen compress), and cursor
* movement would scroll if it was 11 lines or less, and compress if
* it was more than 11 lines. (And, no, I have no idea where the 11
* comes from.)
*
* What we do is try and figure out if the line is less than half of
* a full screen away. If it is, we expand the screen if there's
* room, and then scroll as necessary. The alternative is to compress
* and repaint.
*
* !!!
* This code is a special case from beginning to end. Unfortunately,
* home modems are still slow enough that it's worth having.
*
* XXX
* If the line a really long one, i.e. part of the line is on the
* screen but the column offset is not, we'll end up in the adjust
* code, when we should probably have compressed the screen.
*/
if (IS_SMALL(sp))
if (LNO < HMAP->lno) {
lcnt = vs_sm_nlines(sp, HMAP, LNO, sp->t_maxrows);
if (lcnt <= HALFSCREEN(sp))
for (; lcnt && sp->t_rows != sp->t_maxrows;
--lcnt, ++sp->t_rows) {
++TMAP;
if (vs_sm_1down(sp))
return (1);
}
else
goto small_fill;
} else if (LNO > TMAP->lno) {
lcnt = vs_sm_nlines(sp, TMAP, LNO, sp->t_maxrows);
if (lcnt <= HALFSCREEN(sp))
for (; lcnt && sp->t_rows != sp->t_maxrows;
--lcnt, ++sp->t_rows) {
if (vs_sm_next(sp, TMAP, TMAP + 1))
return (1);
++TMAP;
if (vs_line(sp, TMAP, NULL, NULL))
return (1);
}
else {
small_fill: (void)gp->scr_move(sp, LASTLINE(sp), 0);
(void)gp->scr_clrtoeol(sp);
for (; sp->t_rows > sp->t_minrows;
--sp->t_rows, --TMAP) {
(void)gp->scr_move(sp, TMAP - HMAP, 0);
(void)gp->scr_clrtoeol(sp);
}
if (vs_sm_fill(sp, LNO, P_FILL))
return (1);
F_SET(sp, SC_SCR_REDRAW);
goto adjust;
}
}
/*
* 6b: Line down, or current screen.
*/
if (LNO >= HMAP->lno) {
/* Current screen. */
if (LNO <= TMAP->lno)
goto adjust;
if (F_ISSET(sp, SC_SCR_TOP))
goto top;
if (F_ISSET(sp, SC_SCR_CENTER))
goto middle;
/*
* If less than half a screen above the line, scroll down
* until the line is on the screen.
*/
lcnt = vs_sm_nlines(sp, TMAP, LNO, HALFTEXT(sp));
if (lcnt < HALFTEXT(sp)) {
while (lcnt--)
if (vs_sm_1up(sp))
return (1);
goto adjust;
}
goto bottom;
}
/*
* 6c: If not on the current screen, may request center or top.
*/
if (F_ISSET(sp, SC_SCR_TOP))
goto top;
if (F_ISSET(sp, SC_SCR_CENTER))
goto middle;
/*
* 6d: Line up.
*/
lcnt = vs_sm_nlines(sp, HMAP, LNO, HALFTEXT(sp));
if (lcnt < HALFTEXT(sp)) {
/*
* If less than half a screen below the line, scroll up until
* the line is the first line on the screen. Special check so
* that if the screen has been emptied, we refill it.
*/
if (db_exist(sp, HMAP->lno)) {
while (lcnt--)
if (vs_sm_1down(sp))
return (1);
goto adjust;
}
/*
* If less than a half screen from the bottom of the file,
* put the last line of the file on the bottom of the screen.
*/
bottom: if (db_last(sp, &lastline))
return (1);
tmp.lno = LNO;
tmp.coff = HMAP->coff;
tmp.soff = 1;
lcnt = vs_sm_nlines(sp, &tmp, lastline, sp->t_rows);
if (lcnt < HALFTEXT(sp)) {
if (vs_sm_fill(sp, lastline, P_BOTTOM))
return (1);
F_SET(sp, SC_SCR_REDRAW);
goto adjust;
}
/* It's not close, just put the line in the middle. */
goto middle;
}
/*
* If less than half a screen from the top of the file, put the first
* line of the file at the top of the screen. Otherwise, put the line
* in the middle of the screen.
*/
tmp.lno = 1;
tmp.coff = HMAP->coff;
tmp.soff = 1;
lcnt = vs_sm_nlines(sp, &tmp, LNO, HALFTEXT(sp));
if (lcnt < HALFTEXT(sp)) {
if (vs_sm_fill(sp, 1, P_TOP))
return (1);
} else
middle: if (vs_sm_fill(sp, LNO, P_MIDDLE))
return (1);
if (0) {
top: if (vs_sm_fill(sp, LNO, P_TOP))
return (1);
}
F_SET(sp, SC_SCR_REDRAW);
/*
* At this point we know part of the line is on the screen. Since
* scrolling is done using logical lines, not physical, all of the
* line may not be on the screen. While that's not necessarily bad,
* if the part the cursor is on isn't there, we're going to lose.
* This can be tricky; if the line covers the entire screen, lno
* may be the same as both ends of the map, that's why we test BOTH
* the top and the bottom of the map. This isn't a problem for
* left-right scrolling, the cursor movement code handles the problem.
*
* There's a performance issue here if editing *really* long lines.
* This gets to the right spot by scrolling, and, in a binary, by
* scrolling hundreds of lines. If the adjustment looks like it's
* going to be a serious problem, refill the screen and repaint.
*/
adjust: if (!O_ISSET(sp, O_LEFTRIGHT) &&
(LNO == HMAP->lno || LNO == TMAP->lno)) {
cnt = vs_screens(sp, LNO, &CNO);
if (LNO == HMAP->lno && cnt < HMAP->soff)
if ((HMAP->soff - cnt) > HALFTEXT(sp)) {
HMAP->soff = cnt;
vs_sm_fill(sp, OOBLNO, P_TOP);
F_SET(sp, SC_SCR_REDRAW);
} else
while (cnt < HMAP->soff)
if (vs_sm_1down(sp))
return (1);
if (LNO == TMAP->lno && cnt > TMAP->soff)
if ((cnt - TMAP->soff) > HALFTEXT(sp)) {
TMAP->soff = cnt;
vs_sm_fill(sp, OOBLNO, P_BOTTOM);
F_SET(sp, SC_SCR_REDRAW);
} else
while (cnt > TMAP->soff)
if (vs_sm_1up(sp))
return (1);
}
/*
* If the screen needs to be repainted, skip cursor optimization.
* However, in the code above we skipped leftright scrolling on
* the grounds that the cursor code would handle it. Make sure
* the right screen is up.
*/
if (F_ISSET(sp, SC_SCR_REDRAW)) {
if (O_ISSET(sp, O_LEFTRIGHT))
goto slow;
goto paint;
}
/*
* 7: Cursor movements (current screen only).
*/
if (!LF_ISSET(UPDATE_CURSOR))
goto number;
/*
* Decide cursor position. If the line has changed, the cursor has
* moved over a tab, or don't know where the cursor was, reparse the
* line. Otherwise, we've just moved over fixed-width characters,
* and can calculate the left/right scrolling and cursor movement
* without reparsing the line. Note that we don't know which (if any)
* of the characters between the old and new cursor positions changed.
*
* XXX
* With some work, it should be possible to handle tabs quickly, at
* least in obvious situations, like moving right and encountering
* a tab, without reparsing the whole line.
*
* If the line we're working with has changed, reread it..
*/
if (F_ISSET(vip, VIP_CUR_INVALID) || LNO != OLNO)
goto slow;
/* Otherwise, if nothing's changed, ignore the cursor. */
if (CNO == OCNO)
goto fast;
/*
* Get the current line. If this fails, we either have an empty
* file and can just repaint, or there's a real problem. This
* isn't a performance issue because there aren't any ways to get
* here repeatedly.
*/
if (db_eget(sp, LNO, &p, &len, &isempty)) {
if (isempty)
goto slow;
return (1);
}
#ifdef DEBUG
/* Sanity checking. */
if (CNO >= len && len != 0) {
msgq(sp, M_ERR, "Error: %s/%d: cno (%u) >= len (%u)",
tail(__FILE__), __LINE__, CNO, len);
return (1);
}
#endif
/*
* The basic scheme here is to look at the characters in between
* the old and new positions and decide how big they are on the
* screen, and therefore, how many screen positions to move.
*/
if (CNO < OCNO) {
/*
* 7a: Cursor moved left.
*
* Point to the old character. The old cursor position can
* be past EOL if, for example, we just deleted the rest of
* the line. In this case, since we don't know the width of
* the characters we traversed, we have to do it slowly.
*/
p += OCNO;
cnt = (OCNO - CNO) + 1;
if (OCNO >= len)
goto slow;
/*
* Quick sanity check -- it's hard to figure out exactly when
* we cross a screen boundary as we do in the cursor right
* movement. If cnt is so large that we're going to cross the
* boundary no matter what, stop now.
*/
if (SCNO + 1 + MAX_CHARACTER_COLUMNS < cnt)
goto slow;
/*
* Count up the widths of the characters. If it's a tab
* character, go do it the the slow way.
*/
for (cwtotal = 0; cnt--; cwtotal += KEY_LEN(sp, ch))
if ((ch = *(u_char *)p--) == '\t')
goto slow;
/*
* Decrement the screen cursor by the total width of the
* characters minus 1.
*/
cwtotal -= 1;
/*
* If we're moving left, and there's a wide character in the
* current position, go to the end of the character.
*/
if (KEY_LEN(sp, ch) > 1)
cwtotal -= KEY_LEN(sp, ch) - 1;
/*
* If the new column moved us off of the current logical line,
* calculate a new one. If doing leftright scrolling, we've
* moved off of the current screen, as well.
*/
if (SCNO < cwtotal)
goto slow;
SCNO -= cwtotal;
} else {
/*
* 7b: Cursor moved right.
*
* Point to the first character to the right.
*/
p += OCNO + 1;
cnt = CNO - OCNO;
/*
* Count up the widths of the characters. If it's a tab
* character, go do it the the slow way. If we cross a
* screen boundary, we can quit.
*/
for (cwtotal = SCNO; cnt--;) {
if ((ch = *(u_char *)p++) == '\t')
goto slow;
if ((cwtotal += KEY_LEN(sp, ch)) >= SCREEN_COLS(sp))
break;
}
/*
* Increment the screen cursor by the total width of the
* characters.
*/
SCNO = cwtotal;
/* See screen change comment in section 6a. */
if (SCNO >= SCREEN_COLS(sp))
goto slow;
}
/*
* 7c: Fast cursor update.
*
* We have the current column, retrieve the current row.
*/
fast: (void)gp->scr_cursor(sp, &y, ¬used);
goto done_cursor;
/*
* 7d: Slow cursor update.
*
* Walk through the map and find the current line.
*/
slow: for (smp = HMAP; smp->lno != LNO; ++smp);
/*
* 7e: Leftright scrolling adjustment.
*
* If doing left-right scrolling and the cursor movement has changed
* the displayed screen, scroll the screen left or right, unless we're
* updating the info line in which case we just scroll that one line.
* We adjust the offset up or down until we have a window that covers
* the current column, making sure that we adjust differently for the
* first screen as compared to subsequent ones.
*/
if (O_ISSET(sp, O_LEFTRIGHT)) {
/*
* Get the screen column for this character, and correct
* for the number option offset.
*/
cnt = vs_columns(sp, NULL, LNO, &CNO, NULL);
if (O_ISSET(sp, O_NUMBER) && cnt >= O_NUMBER_LENGTH)
cnt -= O_NUMBER_LENGTH;
/* Adjust the window towards the beginning of the line. */
off = smp->coff;
if (off >= cnt) {
do {
if (off >= O_VAL(sp, O_SIDESCROLL))
off -= O_VAL(sp, O_SIDESCROLL);
else {
off = 0;
break;
}
} while (off >= cnt);
goto shifted;
}
/* Adjust the window towards the end of the line. */
if (off == 0 && off + SCREEN_COLS(sp) < cnt ||
off != 0 && off + sp->cols < cnt) {
do {
off += O_VAL(sp, O_SIDESCROLL);
} while (off + sp->cols < cnt);
shifted: /* Fill in screen map with the new offset. */
if (F_ISSET(sp, SC_TINPUT_INFO))
smp->coff = off;
else {
for (smp = HMAP; smp <= TMAP; ++smp)
smp->coff = off;
leftright_warp = 1;
}
goto paint;
}
/*
* We may have jumped here to adjust a leftright screen because
* redraw was set. If so, we have to paint the entire screen.
*/
if (F_ISSET(sp, SC_SCR_REDRAW))
goto paint;
}
/*
* Update the screen lines for this particular file line until we
* have a new screen cursor position.
*/
for (y = -1,
vip->sc_smap = NULL; smp <= TMAP && smp->lno == LNO; ++smp) {
if (vs_line(sp, smp, &y, &SCNO))
return (1);
if (y != -1) {
vip->sc_smap = smp;
break;
}
}
goto done_cursor;
/*
* 8: Repaint the entire screen.
*
* Lost big, do what you have to do. We flush the cache, since
* SC_SCR_REDRAW gets set when the screen isn't worth fixing, and
* it's simpler to repaint. So, don't trust anything that we
* think we know about it.
*/
paint: for (smp = HMAP; smp <= TMAP; ++smp)
SMAP_FLUSH(smp);
for (y = -1, vip->sc_smap = NULL, smp = HMAP; smp <= TMAP; ++smp) {
if (vs_line(sp, smp, &y, &SCNO))
return (1);
if (y != -1 && vip->sc_smap == NULL)
vip->sc_smap = smp;
}
/*
* If it's a small screen and we're redrawing, clear the unused lines,
* ex may have overwritten them.
*/
if (F_ISSET(sp, SC_SCR_REDRAW) && IS_SMALL(sp))
for (cnt = sp->t_rows; cnt <= sp->t_maxrows; ++cnt) {
(void)gp->scr_move(sp, cnt, 0);
(void)gp->scr_clrtoeol(sp);
}
didpaint = 1;
done_cursor:
/*
* Sanity checking. When the repainting code messes up, the usual
* result is we don't repaint the cursor and so sc_smap will be
* NULL. If we're debugging, die, otherwise restart from scratch.
*/
#ifdef DEBUG
if (vip->sc_smap == NULL)
abort();
#else
if (vip->sc_smap == NULL) {
F_SET(sp, SC_SCR_REFORMAT);
return (vs_paint(sp, flags));
}
#endif
/*
* 9: Set the remembered cursor values.
*/
OCNO = CNO;
OLNO = LNO;
/*
* 10: Repaint the line numbers.
*
* If O_NUMBER is set and the VIP_N_RENUMBER bit is set, and we
* didn't repaint the screen, repaint all of the line numbers,
* they've changed.
*/
number: if (O_ISSET(sp, O_NUMBER) &&
F_ISSET(vip, VIP_N_RENUMBER) && !didpaint && vs_number(sp))
return (1);
/*
* 11: Update the mode line, position the cursor, and flush changes.
*
* If we warped the screen, we have to refresh everything.
*/
if (leftright_warp)
LF_SET(UPDATE_CURSOR | UPDATE_SCREEN);
if (LF_ISSET(UPDATE_SCREEN) && !IS_ONELINE(sp) &&
!F_ISSET(vip, VIP_S_MODELINE) && !F_ISSET(sp, SC_TINPUT_INFO))
vs_modeline(sp);
if (LF_ISSET(UPDATE_CURSOR)) {
(void)gp->scr_move(sp, y, SCNO);
/*
* XXX
* If the screen shifted, we recalculate the "most favorite"
* cursor position. Vi won't know that we've warped the
* screen, so it's going to have a wrong idea about where the
* cursor should be. This is vi's problem, and fixing it here
* is a gross layering violation.
*/
if (leftright_warp)
(void)vs_column(sp, &sp->rcm);
}
if (LF_ISSET(UPDATE_SCREEN))
(void)gp->scr_refresh(sp, F_ISSET(vip, VIP_N_EX_PAINT));
/* 12: Clear the flags that are handled by this routine. */
F_CLR(sp, SC_SCR_CENTER | SC_SCR_REDRAW | SC_SCR_REFORMAT | SC_SCR_TOP);
F_CLR(vip, VIP_CUR_INVALID |
VIP_N_EX_PAINT | VIP_N_REFRESH | VIP_N_RENUMBER | VIP_S_MODELINE);
return (0);
#undef LNO
#undef OLNO
#undef CNO
#undef OCNO
#undef SCNO
}
/*
* vs_modeline --
* Update the mode line.
*/
static void
vs_modeline(sp)
SCR *sp;
{
static char * const modes[] = {
"215|Append", /* SM_APPEND */
"216|Change", /* SM_CHANGE */
"217|Command", /* SM_COMMAND */
"218|Insert", /* SM_INSERT */
"219|Replace", /* SM_REPLACE */
};
GS *gp;
size_t cols, curcol, curlen, endpoint, len, midpoint;
const char *t;
int ellipsis;
char *p, buf[20];
gp = sp->gp;
/*
* We put down the file name, the ruler, the mode and the dirty flag.
* If there's not enough room, there's not enough room, we don't play
* any special games. We try to put the ruler in the middle and the
* mode and dirty flag at the end.
*
* !!!
* Leave the last character blank, in case it's a really dumb terminal
* with hardware scroll. Second, don't paint the last character in the
* screen, SunOS 4.1.1 and Ultrix 4.2 curses won't let you.
*
* Move to the last line on the screen.
*/
(void)gp->scr_move(sp, LASTLINE(sp), 0);
/* If more than one screen in the display, show the file name. */
curlen = 0;
if (IS_SPLIT(sp)) {
for (p = sp->frp->name; *p != '\0'; ++p);
for (ellipsis = 0, cols = sp->cols / 2; --p > sp->frp->name;) {
if (*p == '/') {
++p;
break;
}
if ((curlen += KEY_LEN(sp, *p)) > cols) {
ellipsis = 3;
curlen +=
KEY_LEN(sp, '.') * 3 + KEY_LEN(sp, ' ');
while (curlen > cols) {
++p;
curlen -= KEY_LEN(sp, *p);
}
break;
}
}
if (ellipsis) {
while (ellipsis--)
(void)gp->scr_addstr(sp,
KEY_NAME(sp, '.'), KEY_LEN(sp, '.'));
(void)gp->scr_addstr(sp,
KEY_NAME(sp, ' '), KEY_LEN(sp, ' '));
}
for (; *p != '\0'; ++p)
(void)gp->scr_addstr(sp,
KEY_NAME(sp, *p), KEY_LEN(sp, *p));
}
/* Clear the rest of the line. */
(void)gp->scr_clrtoeol(sp);
/*
* Display the ruler. If we're not at the midpoint yet, move there.
* Otherwise, add in two extra spaces.
*
* Adjust the current column for the fact that the editor uses it as
* a zero-based number.
*
* XXX
* Assume that numbers, commas, and spaces only take up a single
* column on the screen.
*/
cols = sp->cols - 1;
if (O_ISSET(sp, O_RULER)) {
vs_column(sp, &curcol);
len = snprintf(buf, sizeof(buf), "%lu,%lu",
(u_long)sp->lno, (u_long)(curcol + 1));
midpoint = (cols - ((len + 1) / 2)) / 2;
if (curlen < midpoint) {
(void)gp->scr_move(sp, LASTLINE(sp), midpoint);
curlen += len;
} else if (curlen + 2 + len < cols) {
(void)gp->scr_addstr(sp, " ", 2);
curlen += 2 + len;
}
(void)gp->scr_addstr(sp, buf, len);
}
/*
* Display the mode and the modified flag, as close to the end of the
* line as possible, but guaranteeing at least two spaces between the
* ruler and the modified flag.
*/
#define MODESIZE 9
endpoint = cols;
if (O_ISSET(sp, O_SHOWMODE)) {
if (F_ISSET(sp->ep, F_MODIFIED))
--endpoint;
t = msg_cat(sp, modes[sp->showmode], &len);
endpoint -= len;
}
if (endpoint > curlen + 2) {
(void)gp->scr_move(sp, LASTLINE(sp), endpoint);
if (O_ISSET(sp, O_SHOWMODE)) {
if (F_ISSET(sp->ep, F_MODIFIED))
(void)gp->scr_addstr(sp,
KEY_NAME(sp, '*'), KEY_LEN(sp, '*'));
(void)gp->scr_addstr(sp, t, len);
}
}
}