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display.c
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display.c
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/* display.c
*
* The functions in this file handle redisplay. There are two halves, the
* ones that update the virtual display screen, and the ones that make the
* physical display screen the same as the virtual display screen. These
* functions use hints that are left in the windows by the commands.
*
* Modified by Petri Kutvonen
*/
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include "estruct.h"
#include "edef.h"
#include "efunc.h"
#include "line.h"
#include "version.h"
#include "wrapper.h"
#include "utf8.h"
struct video {
int v_flag; /* Flags */
#if COLOR
int v_fcolor; /* current forground color */
int v_bcolor; /* current background color */
int v_rfcolor; /* requested forground color */
int v_rbcolor; /* requested background color */
#endif
unicode_t v_text[1]; /* Screen data. */
};
#define VFCHG 0x0001 /* Changed flag */
#define VFEXT 0x0002 /* extended (beyond column 80) */
#define VFREV 0x0004 /* reverse video status */
#define VFREQ 0x0008 /* reverse video request */
#define VFCOL 0x0010 /* color change requested */
static struct video **vscreen; /* Virtual screen. */
#if MEMMAP == 0 || SCROLLCODE
static struct video **pscreen; /* Physical screen. */
#endif
static int displaying = TRUE;
#if UNIX
#include <signal.h>
#endif
#ifdef SIGWINCH
#include <sys/ioctl.h>
/* for window size changes */
int chg_width, chg_height;
#endif
static int reframe(struct window *wp);
static void updone(struct window *wp);
static void updall(struct window *wp);
static int scrolls(int inserts);
static void scrscroll(int from, int to, int count);
static int texttest(int vrow, int prow);
static int endofline(unicode_t *s, int n);
static void updext(void);
static int updateline(int row, struct video *vp1, struct video *vp2);
static void modeline(struct window *wp);
static void mlputi(int i, int r);
static void mlputli(long l, int r);
static void mlputf(int s);
static int newscreensize(int h, int w);
#if RAINBOW
static void putline(int row, int col, char *buf);
#endif
/*
* Initialize the data structures used by the display code. The edge vectors
* used to access the screens are set up. The operating system's terminal I/O
* channel is set up. All the other things get initialized at compile time.
* The original window has "WFCHG" set, so that it will get completely
* redrawn on the first call to "update".
*/
void vtinit(void)
{
int i;
struct video *vp;
TTopen(); /* open the screen */
TTkopen(); /* open the keyboard */
TTrev(FALSE);
vscreen = xmalloc(term.t_mrow * sizeof(struct video *));
#if MEMMAP == 0 || SCROLLCODE
pscreen = xmalloc(term.t_mrow * sizeof(struct video *));
#endif
for (i = 0; i < term.t_mrow; ++i) {
vp = xmalloc(sizeof(struct video) + term.t_mcol*4);
vp->v_flag = 0;
#if COLOR
vp->v_rfcolor = 7;
vp->v_rbcolor = 0;
#endif
vscreen[i] = vp;
#if MEMMAP == 0 || SCROLLCODE
vp = xmalloc(sizeof(struct video) + term.t_mcol*4);
vp->v_flag = 0;
pscreen[i] = vp;
#endif
}
}
#if CLEAN
/* free up all the dynamically allocated video structures */
void vtfree(void)
{
int i;
for (i = 0; i < term.t_mrow; ++i) {
free(vscreen[i]);
#if MEMMAP == 0 || SCROLLCODE
free(pscreen[i]);
#endif
}
free(vscreen);
#if MEMMAP == 0 || SCROLLCODE
free(pscreen);
#endif
}
#endif
/*
* Clean up the virtual terminal system, in anticipation for a return to the
* operating system. Move down to the last line and clear it out (the next
* system prompt will be written in the line). Shut down the channel to the
* terminal.
*/
void vttidy(void)
{
mlerase();
movecursor(term.t_nrow, 0);
TTflush();
TTclose();
TTkclose();
#ifdef PKCODE
write(1, "\r", 1);
#endif
}
/*
* Set the virtual cursor to the specified row and column on the virtual
* screen. There is no checking for nonsense values; this might be a good
* idea during the early stages.
*/
void vtmove(int row, int col)
{
vtrow = row;
vtcol = col;
}
/*
* Write a character to the virtual screen. The virtual row and
* column are updated. If we are not yet on left edge, don't print
* it yet. If the line is too long put a "$" in the last column.
*
* This routine only puts printing characters into the virtual
* terminal buffers. Only column overflow is checked.
*/
static void vtputc(int c)
{
struct video *vp; /* ptr to line being updated */
/* In case somebody passes us a signed char.. */
if (c < 0) {
c += 256;
if (c < 0)
return;
}
vp = vscreen[vtrow];
if (vtcol >= term.t_ncol) {
++vtcol;
vp->v_text[term.t_ncol - 1] = '$';
return;
}
if (c == '\t') {
do {
vtputc(' ');
} while (((vtcol + taboff) & tabmask) != 0);
return;
}
if (c < 0x20) {
vtputc('^');
vtputc(c ^ 0x40);
return;
}
if (c == 0x7f) {
vtputc('^');
vtputc('?');
return;
}
if (c >= 0x80 && c <= 0xA0) {
static const char hex[] = "0123456789abcdef";
vtputc('\\');
vtputc(hex[c >> 4]);
vtputc(hex[c & 15]);
return;
}
if (vtcol >= 0)
vp->v_text[vtcol] = c;
++vtcol;
}
/*
* Erase from the end of the software cursor to the end of the line on which
* the software cursor is located.
*/
static void vteeol(void)
{
/* struct video *vp; */
unicode_t *vcp = vscreen[vtrow]->v_text;
/* vp = vscreen[vtrow]; */
while (vtcol < term.t_ncol)
/* vp->v_text[vtcol++] = ' '; */
vcp[vtcol++] = ' ';
}
/*
* upscreen:
* user routine to force a screen update
* always finishes complete update
*/
int upscreen(int f, int n)
{
update(TRUE);
return TRUE;
}
#if SCROLLCODE
static int scrflags;
#endif
/*
* Make sure that the display is right. This is a three part process. First,
* scan through all of the windows looking for dirty ones. Check the framing,
* and refresh the screen. Second, make sure that "currow" and "curcol" are
* correct for the current window. Third, make the virtual and physical
* screens the same.
*
* int force; force update past type ahead?
*/
int update(int force)
{
struct window *wp;
#if TYPEAH && ! PKCODE
if (force == FALSE && typahead())
return TRUE;
#endif
#if VISMAC == 0
if (force == FALSE && kbdmode == PLAY)
return TRUE;
#endif
displaying = TRUE;
#if SCROLLCODE
/* first, propagate mode line changes to all instances of
a buffer displayed in more than one window */
wp = wheadp;
while (wp != NULL) {
if (wp->w_flag & WFMODE) {
if (wp->w_bufp->b_nwnd > 1) {
/* make sure all previous windows have this */
struct window *owp;
owp = wheadp;
while (owp != NULL) {
if (owp->w_bufp == wp->w_bufp)
owp->w_flag |= WFMODE;
owp = owp->w_wndp;
}
}
}
wp = wp->w_wndp;
}
#endif
/* update any windows that need refreshing */
wp = wheadp;
while (wp != NULL) {
if (wp->w_flag) {
/* if the window has changed, service it */
reframe(wp); /* check the framing */
#if SCROLLCODE
if (wp->w_flag & (WFKILLS | WFINS)) {
scrflags |=
(wp->w_flag & (WFINS | WFKILLS));
wp->w_flag &= ~(WFKILLS | WFINS);
}
#endif
if ((wp->w_flag & ~WFMODE) == WFEDIT)
updone(wp); /* update EDITed line */
else if (wp->w_flag & ~WFMOVE)
updall(wp); /* update all lines */
#if SCROLLCODE
if (scrflags || (wp->w_flag & WFMODE))
#else
if (wp->w_flag & WFMODE)
#endif
modeline(wp); /* update modeline */
wp->w_flag = 0;
wp->w_force = 0;
}
/* on to the next window */
wp = wp->w_wndp;
}
/* recalc the current hardware cursor location */
updpos();
#if MEMMAP && ! SCROLLCODE
/* update the cursor and flush the buffers */
movecursor(currow, curcol - lbound);
#endif
/* check for lines to de-extend */
upddex();
/* if screen is garbage, re-plot it */
if (sgarbf != FALSE)
updgar();
/* update the virtual screen to the physical screen */
updupd(force);
/* update the cursor and flush the buffers */
movecursor(currow, curcol - lbound);
TTflush();
displaying = FALSE;
#if SIGWINCH
while (chg_width || chg_height)
newscreensize(chg_height, chg_width);
#endif
return TRUE;
}
/*
* reframe:
* check to see if the cursor is on in the window
* and re-frame it if needed or wanted
*/
static int reframe(struct window *wp)
{
struct line *lp, *lp0;
int i = 0;
/* if not a requested reframe, check for a needed one */
if ((wp->w_flag & WFFORCE) == 0) {
#if SCROLLCODE
/* loop from one line above the window to one line after */
lp = wp->w_linep;
lp0 = lback(lp);
if (lp0 == wp->w_bufp->b_linep)
i = 0;
else {
i = -1;
lp = lp0;
}
for (; i <= (int) (wp->w_ntrows); i++)
#else
lp = wp->w_linep;
for (i = 0; i < wp->w_ntrows; i++)
#endif
{
/* if the line is in the window, no reframe */
if (lp == wp->w_dotp) {
#if SCROLLCODE
/* if not _quite_ in, we'll reframe gently */
if (i < 0 || i == wp->w_ntrows) {
/* if the terminal can't help, then
we're simply outside */
if (term.t_scroll == NULL)
i = wp->w_force;
break;
}
#endif
return TRUE;
}
/* if we are at the end of the file, reframe */
if (lp == wp->w_bufp->b_linep)
break;
/* on to the next line */
lp = lforw(lp);
}
}
#if SCROLLCODE
if (i == -1) { /* we're just above the window */
i = scrollcount; /* put dot at first line */
scrflags |= WFINS;
} else if (i == wp->w_ntrows) { /* we're just below the window */
i = -scrollcount; /* put dot at last line */
scrflags |= WFKILLS;
} else /* put dot where requested */
#endif
i = wp->w_force; /* (is 0, unless reposition() was called) */
wp->w_flag |= WFMODE;
/* how far back to reframe? */
if (i > 0) { /* only one screen worth of lines max */
if (--i >= wp->w_ntrows)
i = wp->w_ntrows - 1;
} else if (i < 0) { /* negative update???? */
i += wp->w_ntrows;
if (i < 0)
i = 0;
} else
i = wp->w_ntrows / 2;
/* backup to new line at top of window */
lp = wp->w_dotp;
while (i != 0 && lback(lp) != wp->w_bufp->b_linep) {
--i;
lp = lback(lp);
}
/* and reset the current line at top of window */
wp->w_linep = lp;
wp->w_flag |= WFHARD;
wp->w_flag &= ~WFFORCE;
return TRUE;
}
static void show_line(struct line *lp)
{
int i = 0, len = llength(lp);
while (i < len) {
unicode_t c;
i += utf8_to_unicode(lp->l_text, i, len, &c);
vtputc(c);
}
}
/*
* updone:
* update the current line to the virtual screen
*
* struct window *wp; window to update current line in
*/
static void updone(struct window *wp)
{
struct line *lp; /* line to update */
int sline; /* physical screen line to update */
/* search down the line we want */
lp = wp->w_linep;
sline = wp->w_toprow;
while (lp != wp->w_dotp) {
++sline;
lp = lforw(lp);
}
/* and update the virtual line */
vscreen[sline]->v_flag |= VFCHG;
vscreen[sline]->v_flag &= ~VFREQ;
vtmove(sline, 0);
show_line(lp);
#if COLOR
vscreen[sline]->v_rfcolor = wp->w_fcolor;
vscreen[sline]->v_rbcolor = wp->w_bcolor;
#endif
vteeol();
}
/*
* updall:
* update all the lines in a window on the virtual screen
*
* struct window *wp; window to update lines in
*/
static void updall(struct window *wp)
{
struct line *lp; /* line to update */
int sline; /* physical screen line to update */
/* search down the lines, updating them */
lp = wp->w_linep;
sline = wp->w_toprow;
while (sline < wp->w_toprow + wp->w_ntrows) {
/* and update the virtual line */
vscreen[sline]->v_flag |= VFCHG;
vscreen[sline]->v_flag &= ~VFREQ;
vtmove(sline, 0);
if (lp != wp->w_bufp->b_linep) {
/* if we are not at the end */
show_line(lp);
lp = lforw(lp);
}
/* on to the next one */
#if COLOR
vscreen[sline]->v_rfcolor = wp->w_fcolor;
vscreen[sline]->v_rbcolor = wp->w_bcolor;
#endif
vteeol();
++sline;
}
}
/*
* updpos:
* update the position of the hardware cursor and handle extended
* lines. This is the only update for simple moves.
*/
void updpos(void)
{
struct line *lp;
int i;
/* find the current row */
lp = curwp->w_linep;
currow = curwp->w_toprow;
while (lp != curwp->w_dotp) {
++currow;
lp = lforw(lp);
}
/* find the current column */
curcol = 0;
i = 0;
while (i < curwp->w_doto) {
unicode_t c;
int bytes;
bytes = utf8_to_unicode(lp->l_text, i, curwp->w_doto, &c);
i += bytes;
if (c == '\t')
curcol |= tabmask;
++curcol;
}
/* if extended, flag so and update the virtual line image */
if (curcol >= term.t_ncol - 1) {
vscreen[currow]->v_flag |= (VFEXT | VFCHG);
updext();
} else
lbound = 0;
}
/*
* upddex:
* de-extend any line that derserves it
*/
void upddex(void)
{
struct window *wp;
struct line *lp;
int i;
wp = wheadp;
while (wp != NULL) {
lp = wp->w_linep;
i = wp->w_toprow;
while (i < wp->w_toprow + wp->w_ntrows) {
if (vscreen[i]->v_flag & VFEXT) {
if ((wp != curwp) || (lp != wp->w_dotp) ||
(curcol < term.t_ncol - 1)) {
vtmove(i, 0);
show_line(lp);
vteeol();
/* this line no longer is extended */
vscreen[i]->v_flag &= ~VFEXT;
vscreen[i]->v_flag |= VFCHG;
}
}
lp = lforw(lp);
++i;
}
/* and onward to the next window */
wp = wp->w_wndp;
}
}
/*
* updgar:
* if the screen is garbage, clear the physical screen and
* the virtual screen and force a full update
*/
void updgar(void)
{
unicode_t *txt;
int i, j;
for (i = 0; i < term.t_nrow; ++i) {
vscreen[i]->v_flag |= VFCHG;
#if REVSTA
vscreen[i]->v_flag &= ~VFREV;
#endif
#if COLOR
vscreen[i]->v_fcolor = gfcolor;
vscreen[i]->v_bcolor = gbcolor;
#endif
#if MEMMAP == 0 || SCROLLCODE
txt = pscreen[i]->v_text;
for (j = 0; j < term.t_ncol; ++j)
txt[j] = ' ';
#endif
}
movecursor(0, 0); /* Erase the screen. */
(*term.t_eeop) ();
sgarbf = FALSE; /* Erase-page clears */
mpresf = FALSE; /* the message area. */
#if COLOR
mlerase(); /* needs to be cleared if colored */
#endif
}
/*
* updupd:
* update the physical screen from the virtual screen
*
* int force; forced update flag
*/
int updupd(int force)
{
struct video *vp1;
int i;
#if SCROLLCODE
if (scrflags & WFKILLS)
scrolls(FALSE);
if (scrflags & WFINS)
scrolls(TRUE);
scrflags = 0;
#endif
for (i = 0; i < term.t_nrow; ++i) {
vp1 = vscreen[i];
/* for each line that needs to be updated */
if ((vp1->v_flag & VFCHG) != 0) {
#if TYPEAH && ! PKCODE
if (force == FALSE && typahead())
return TRUE;
#endif
#if MEMMAP && ! SCROLLCODE
updateline(i, vp1);
#else
updateline(i, vp1, pscreen[i]);
#endif
}
}
return TRUE;
}
#if SCROLLCODE
/*
* optimize out scrolls (line breaks, and newlines)
* arg. chooses between looking for inserts or deletes
*/
static int scrolls(int inserts)
{ /* returns true if it does something */
struct video *vpv; /* virtual screen image */
struct video *vpp; /* physical screen image */
int i, j, k;
int rows, cols;
int first, match, count, target, end;
int longmatch, longcount;
int from, to;
if (!term.t_scroll) /* no way to scroll */
return FALSE;
rows = term.t_nrow;
cols = term.t_ncol;
first = -1;
for (i = 0; i < rows; i++) { /* find first wrong line */
if (!texttest(i, i)) {
first = i;
break;
}
}
if (first < 0)
return FALSE; /* no text changes */
vpv = vscreen[first];
vpp = pscreen[first];
if (inserts) {
/* determine types of potential scrolls */
end = endofline(vpv->v_text, cols);
if (end == 0)
target = first; /* newlines */
else if (memcmp(vpp->v_text, vpv->v_text, 4*end) == 0)
target = first + 1; /* broken line newlines */
else
target = first;
} else {
target = first + 1;
}
/* find the matching shifted area */
match = -1;
longmatch = -1;
longcount = 0;
from = target;
for (i = from + 1; i < rows - longcount /* P.K. */ ; i++) {
if (inserts ? texttest(i, from) : texttest(from, i)) {
match = i;
count = 1;
for (j = match + 1, k = from + 1;
j < rows && k < rows; j++, k++) {
if (inserts ? texttest(j, k) :
texttest(k, j))
count++;
else
break;
}
if (longcount < count) {
longcount = count;
longmatch = match;
}
}
}
match = longmatch;
count = longcount;
if (!inserts) {
/* full kill case? */
if (match > 0 && texttest(first, match - 1)) {
target--;
match--;
count++;
}
}
/* do the scroll */
if (match > 0 && count > 2) { /* got a scroll */
/* move the count lines starting at target to match */
if (inserts) {
from = target;
to = match;
} else {
from = match;
to = target;
}
if (2 * count < abs(from - to))
return FALSE;
scrscroll(from, to, count);
for (i = 0; i < count; i++) {
vpp = pscreen[to + i];
vpv = vscreen[to + i];
memcpy(vpp->v_text, vpv->v_text, 4*cols);
vpp->v_flag = vpv->v_flag; /* XXX */
if (vpp->v_flag & VFREV) {
vpp->v_flag &= ~VFREV;
vpp->v_flag |= ~VFREQ;
}
#if MEMMAP
vscreen[to + i]->v_flag &= ~VFCHG;
#endif
}
if (inserts) {
from = target;
to = match;
} else {
from = target + count;
to = match + count;
}
#if MEMMAP == 0
for (i = from; i < to; i++) {
unicode_t *txt;
txt = pscreen[i]->v_text;
for (j = 0; j < term.t_ncol; ++j)
txt[j] = ' ';
vscreen[i]->v_flag |= VFCHG;
}
#endif
return TRUE;
}
return FALSE;
}
/* move the "count" lines starting at "from" to "to" */
static void scrscroll(int from, int to, int count)
{
ttrow = ttcol = -1;
(*term.t_scroll) (from, to, count);
}
/*
* return TRUE on text match
*
* int vrow, prow; virtual, physical rows
*/
static int texttest(int vrow, int prow)
{
struct video *vpv = vscreen[vrow]; /* virtual screen image */
struct video *vpp = pscreen[prow]; /* physical screen image */
return !memcmp(vpv->v_text, vpp->v_text, 4*term.t_ncol);
}
/*
* return the index of the first blank of trailing whitespace
*/
static int endofline(unicode_t *s, int n)
{
int i;
for (i = n - 1; i >= 0; i--)
if (s[i] != ' ')
return i + 1;
return 0;
}
#endif /* SCROLLCODE */
/*
* updext:
* update the extended line which the cursor is currently
* on at a column greater than the terminal width. The line
* will be scrolled right or left to let the user see where
* the cursor is
*/
static void updext(void)
{
int rcursor; /* real cursor location */
struct line *lp; /* pointer to current line */
/* calculate what column the real cursor will end up in */
rcursor = ((curcol - term.t_ncol) % term.t_scrsiz) + term.t_margin;
taboff = lbound = curcol - rcursor + 1;
/* scan through the line outputing characters to the virtual screen */
/* once we reach the left edge */
vtmove(currow, -lbound); /* start scanning offscreen */
lp = curwp->w_dotp; /* line to output */
show_line(lp);
/* truncate the virtual line, restore tab offset */
vteeol();
taboff = 0;
/* and put a '$' in column 1 */
vscreen[currow]->v_text[0] = '$';
}
/*
* Update a single line. This does not know how to use insert or delete
* character sequences; we are using VT52 functionality. Update the physical
* row and column variables. It does try an exploit erase to end of line. The
* RAINBOW version of this routine uses fast video.
*/
#if MEMMAP
/* UPDATELINE specific code for the IBM-PC and other compatables */
static int updateline(int row, struct video *vp1, struct video *vp2)
{
#if SCROLLCODE
unicode_t *cp1;
unicode_t *cp2;
int nch;
cp1 = &vp1->v_text[0];
cp2 = &vp2->v_text[0];
nch = term.t_ncol;
do {
*cp2 = *cp1;
++cp2;
++cp1;
}
while (--nch);
#endif
#if COLOR
scwrite(row, vp1->v_text, vp1->v_rfcolor, vp1->v_rbcolor);
vp1->v_fcolor = vp1->v_rfcolor;
vp1->v_bcolor = vp1->v_rbcolor;
#else
if (vp1->v_flag & VFREQ)
scwrite(row, vp1->v_text, 0, 7);
else
scwrite(row, vp1->v_text, 7, 0);
#endif
vp1->v_flag &= ~(VFCHG | VFCOL); /* flag this line as changed */
}
#else
/*
* updateline()
*
* int row; row of screen to update
* struct video *vp1; virtual screen image
* struct video *vp2; physical screen image
*/
static int updateline(int row, struct video *vp1, struct video *vp2)
{
#if RAINBOW
/* UPDATELINE specific code for the DEC rainbow 100 micro */
unicode_t *cp1;
unicode_t *cp2;
int nch;
/* since we don't know how to make the rainbow do this, turn it off */
flags &= (~VFREV & ~VFREQ);
cp1 = &vp1->v_text[0]; /* Use fast video. */
cp2 = &vp2->v_text[0];
putline(row + 1, 1, cp1);
nch = term.t_ncol;
do {
*cp2 = *cp1;
++cp2;
++cp1;
}
while (--nch);
*flags &= ~VFCHG;
#else
/* UPDATELINE code for all other versions */
unicode_t *cp1;
unicode_t *cp2;
unicode_t *cp3;
unicode_t *cp4;
unicode_t *cp5;
int nbflag; /* non-blanks to the right flag? */
int rev; /* reverse video flag */
int req; /* reverse video request flag */
/* set up pointers to virtual and physical lines */
cp1 = &vp1->v_text[0];
cp2 = &vp2->v_text[0];
#if COLOR
TTforg(vp1->v_rfcolor);
TTbacg(vp1->v_rbcolor);
#endif
#if REVSTA | COLOR
/* if we need to change the reverse video status of the
current line, we need to re-write the entire line */
rev = (vp1->v_flag & VFREV) == VFREV;
req = (vp1->v_flag & VFREQ) == VFREQ;
if ((rev != req)
#if COLOR
|| (vp1->v_fcolor != vp1->v_rfcolor)
|| (vp1->v_bcolor != vp1->v_rbcolor)
#endif
) {
movecursor(row, 0); /* Go to start of line. */
/* set rev video if needed */
if (rev != req)
(*term.t_rev) (req);
/* scan through the line and dump it to the screen and
the virtual screen array */
cp3 = &vp1->v_text[term.t_ncol];
while (cp1 < cp3) {
TTputc(*cp1);
++ttcol;
*cp2++ = *cp1++;
}
/* turn rev video off */
if (rev != req)
(*term.t_rev) (FALSE);
/* update the needed flags */
vp1->v_flag &= ~VFCHG;
if (req)
vp1->v_flag |= VFREV;
else
vp1->v_flag &= ~VFREV;
#if COLOR
vp1->v_fcolor = vp1->v_rfcolor;
vp1->v_bcolor = vp1->v_rbcolor;
#endif