ref: ea413b4a62be9993e4b63bf237f0b1d482f4aafa
dir: /sys/src/cmd/vt/main.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <thread.h>
#include <mouse.h>
#include <keyboard.h>
#include <bio.h>
#include "cons.h"
char *menutext2[] = {
"backup",
"forward",
"reset",
"clear",
"paste",
"page",
0
};
char *menutext3[] = {
"24x80",
"crnl",
"nl",
"raw",
"exit",
0
};
/* variables associated with the screen */
int x, y; /* character positions */
Rune *backp;
int backc;
int atend;
int nbacklines;
int xmax, ymax;
int blocked;
int resize_flag = 1;
int pagemode;
int olines;
int peekc;
int cursoron = 1;
Menu menu2;
Menu menu3;
Rune *histp;
Rune hist[HISTSIZ];
Rune *onscreenrbuf;
uchar *onscreenabuf;
uchar *onscreencbuf;
#define onscreenr(x, y) &onscreenrbuf[((y)*(xmax+2) + (x))]
#define onscreena(x, y) &onscreenabuf[((y)*(xmax+2) + (x))]
#define onscreenc(x, y) &onscreencbuf[((y)*(xmax+2) + (x))]
int yscrmin, yscrmax;
int attr, defattr;
Image *bordercol;
Image *colors[8];
Image *hicolors[8];
Image *red;
Image *green;
Image *fgcolor;
Image *bgcolor;
Image *highlight;
uint rgbacolors[8] = {
0x000000FF, /* black */
0xAA0000FF, /* red */
0x00AA00FF, /* green */
0xFF5500FF, /* brown */
0x0000FFFF, /* blue */
0xAA00AAFF, /* purple */
0x00AAAAFF, /* cyan */
0x7F7F7FFF, /* white */
};
ulong rgbahicolors[8] = {
0x555555FF, /* light black aka grey */
0xFF5555FF, /* light red */
0x55FF55FF, /* light green */
0xFFFF55FF, /* light brown aka yellow */
0x5555FFFF, /* light blue */
0xFF55FFFF, /* light purple */
0x55FFFFFF, /* light cyan */
0xFFFFFFFF, /* light grey aka white */
};
/* terminal control */
struct ttystate ttystate[2] = { {0, 1}, {0, 1} };
Point margin;
Point ftsize;
Rune kbdchar;
#define button1() ((mc->buttons & 07)==1)
#define button2() ((mc->buttons & 07)==2)
#define button3() ((mc->buttons & 07)==4)
Mousectl *mc;
Keyboardctl *kc;
Channel *hc;
Consstate *cs;
int nocolor;
int logfd = -1;
int hostfd = -1;
int hostpid;
Biobuf *snarffp = 0;
Rune *hostbuf, *hostbufp;
char echo_input[BSIZE];
char *echop = echo_input; /* characters to echo, after canon */
char sendbuf[BSIZE]; /* hope you can't type ahead more than BSIZE chars */
char *sendbufp = sendbuf;
char *term;
struct funckey *fk, *appfk;
/* functions */
void initialize(int, char **);
int waitchar(void);
void waitio(void);
int rcvchar(void);
void bigscroll(void);
void readmenu(void);
void selection(void);
void resize(void);
void send_interrupt(void);
int alnum(int);
void escapedump(int,uchar *,int);
int
start_host(void)
{
switch((hostpid = rfork(RFPROC|RFNAMEG|RFFDG|RFNOTEG))) {
case 0:
close(0);
open("/dev/cons", OREAD);
close(1);
open("/dev/cons", OWRITE);
dup(1, 2);
execl("/bin/rc","rcX",nil);
fprint(2, "failed to start up rc: %r\n");
_exits("rc");
case -1:
fprint(2,"rc startup: fork: %r\n");
_exits("rc_fork");
}
return open("/mnt/cons/data", ORDWR);
}
void
send_interrupt(void)
{
postnote(PNGROUP, hostpid, "interrupt");
}
void
hostreader(void*)
{
char cb[BSIZE+1], *cp;
Rune *rb, *rp;
int n, r;
n = 0;
while((r = read(hostfd, cb+n, BSIZE-n)) > 0){
n += r;
rb = mallocz((n+1)*sizeof(Rune), 0);
for(rp = rb, cp = cb; n > 0; n -= r, cp += r){
if(!fullrune(cp, n))
break;
r = chartorune(rp, cp);
if(*rp != 0)
rp++;
}
if(rp > rb){
*rp = 0;
sendp(hc, rb);
} else {
free(rb);
}
if(n > 0) memmove(cb, cp, n);
}
sendp(hc, nil);
}
static void
shutdown(void)
{
send_interrupt();
postnote(PNGROUP, getpid(), "exit");
threadexitsall(nil);
}
void
threadmain(int argc, char **argv)
{
rfork(RFNAMEG|RFNOTEG|RFENVG);
atexit(shutdown);
initialize(argc, argv);
emulate();
}
void
usage(void)
{
fprint(2, "usage: %s [-2abcrx] [-f font] [-l logfile] [cmd...]\n", argv0);
exits("usage");
}
void
initialize(int argc, char **argv)
{
int rflag;
int i, blkbg;
char *fontname, *p;
fontname = nil;
fk = ansifk;
term = "vt100";
blkbg = 0;
rflag = 0;
attr = defattr;
ARGBEGIN{
case '2':
fk = vt220fk;
term = "vt220";
break;
case 'a':
term = "ansi";
break;
case 'b':
blkbg = 1; /* e.g., for linux colored output */
break;
case 'c':
nocolor = 1;
break;
case 'f':
fontname = EARGF(usage());
break;
case 'l':
p = EARGF(usage());
logfd = create(p, OWRITE|OCEXEC, 0666);
if(logfd < 0)
sysfatal("could not create log file: %s: %r", p);
break;
case 'x':
fk = vt220fk;
term = "xterm";
break;
case 'r':
rflag = 1;
break;
default:
usage();
break;
}ARGEND;
if(initdraw(0, fontname, term) < 0)
sysfatal("inidraw failed: %r");
if((mc = initmouse("/dev/mouse", screen)) == nil)
sysfatal("initmouse failed: %r");
if((kc = initkeyboard("/dev/cons")) == nil)
sysfatal("initkeyboard failed: %r");
if((cs = consctl()) == nil)
sysfatal("consctl failed: %r");
cs->raw = rflag;
histp = hist;
menu2.item = menutext2;
menu3.item = menutext3;
pagemode = 0;
blocked = 0;
ftsize.y = font->height;
ftsize.x = stringwidth(font, "m");
red = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DRed);
green = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DGreen);
bordercol = allocimage(display, Rect(0,0,1,1), screen->chan, 1, 0xCCCCCCCC);
highlight = allocimage(display, Rect(0,0,1,1), CHAN1(CAlpha,8), 1, 0x80);
for(i=0; i<8; i++){
colors[i] = allocimage(display, Rect(0,0,1,1), screen->chan, 1,
rgbacolors[i]);
hicolors[i] = allocimage(display, Rect(0,0,1,1), screen->chan, 1,
rgbahicolors[i]);
}
bgcolor = (blkbg? display->black: display->white);
fgcolor = (blkbg? display->white: display->black);
resize();
hc = chancreate(sizeof(Rune*), 5);
if((hostfd = start_host()) >= 0)
proccreate(hostreader, nil, BSIZE+1024);
while(*argv != nil){
sendnchars(strlen(*argv), *argv);
if(argv[1] == nil){
sendnchars(1, "\n");
break;
}
sendnchars(1, " ");
argv++;
}
}
Image*
bgcol(int a, int c)
{
if(nocolor || (c & (1<<0)) == 0){
if(a & TReverse)
return fgcolor;
return bgcolor;
}
if((a & TReverse) != 0)
c >>= 4;
return colors[(c>>1)&7];
}
Image*
fgcol(int a, int c)
{
if(nocolor || (c & (1<<4)) == 0){
if(a & TReverse)
return bgcolor;
return fgcolor;
}
if((a & TReverse) == 0)
c >>= 4;
if(a & THighIntensity)
return hicolors[(c>>1)&7];
return colors[(c>>1)&7];
}
void
drawscreen(void)
{
int x, y, n;
uchar *ap, *cp;
Image *c;
Rune *rp;
Point p, q;
draw(screen, screen->r, bgcolor, nil, ZP);
/* draw background */
for(y = 0; y <= ymax; y++){
for(x = 0; x <= xmax; x += n){
cp = onscreenc(x, y);
ap = onscreena(x, y);
c = bgcol(*ap, *cp);
if(c == bgcolor){
n = 1;
continue;
}
for(n = 1; x+n <= xmax && bgcol(ap[n], cp[n]) == c; n++)
;
draw(screen, Rpt(pt(x, y), pt(x+n, y+1)), c, nil, ZP);
}
}
/* draw foreground */
for(y = 0; y <= ymax; y++){
for(x = 0; x <= xmax; x += n){
rp = onscreenr(x, y);
if(*rp == 0){
n = 1;
continue;
}
ap = onscreena(x, y);
cp = onscreenc(x, y);
c = fgcol(*ap, *cp);
for(n = 1; x+n <= xmax && rp[n] != 0 && fgcol(ap[n], cp[n]) == c
&& (ap[n] ^ *ap) & TUnderline == 0; n++)
;
p = pt(x, y);
q = runestringn(screen, p, c, ZP, font, rp, n);
if(*ap & TUnderline){
p.y += font->ascent+1;
q.y += font->ascent+2;
draw(screen, Rpt(p, q), c, nil, ZP);
}
}
if(*onscreenr(x, y) == 0)
runestringn(screen, pt(x, y),
bordercol,
ZP, font, L">", 1);
}
}
void
drawcursor(void)
{
Image *col;
if(cursoron == 0)
return;
col = (blocked || hostfd < 0) ? red : bordercol;
border(screen, Rpt(pt(x, y), pt(x+1, y+1)), 2, col, ZP);
}
void
clear(int x1, int y1, int x2, int y2)
{
int c = (attr & 0x0F00)>>8; /* bgcolor */
while(y1 < y2){
if(x1 < x2){
memset(onscreenr(x1, y1), 0, (x2-x1)*sizeof(Rune));
memset(onscreena(x1, y1), 0, x2-x1);
memset(onscreenc(x1, y1), c, x2-x1);
}
if(x2 > xmax)
*onscreenr(xmax+1, y1) = '\n';
y1++;
}
}
void
newline(void)
{
if(x > xmax)
*onscreenr(xmax+1, y) = 0; /* wrap arround, remove hidden newline */
nbacklines--;
if(y >= yscrmax) {
y = yscrmax;
if(pagemode && olines >= yscrmax) {
blocked = 1;
return;
}
scroll(yscrmin+1, yscrmax+1, yscrmin, yscrmax);
} else
y++;
olines++;
}
int
get_next_char(void)
{
int c = peekc;
peekc = 0;
if(c > 0)
return(c);
while(c <= 0) {
if(backp) {
c = *backp;
if(c && nbacklines >= 0) {
backp++;
if(backp >= &hist[HISTSIZ])
backp = hist;
return(c);
}
backp = 0;
}
c = waitchar();
if(c > 0 && logfd >= 0)
fprint(logfd, "%C", (Rune)c);
}
*histp++ = c;
if(histp >= &hist[HISTSIZ])
histp = hist;
*histp = '\0';
return(c);
}
char*
backrune(char *start, char *cp)
{
char *ep;
ep = cp;
cp -= UTFmax;
if(cp < start)
cp = start;
while(cp < ep){
Rune r;
int n;
n = chartorune(&r, cp);
if(cp + n >= ep)
break;
cp += n;
}
return cp;
}
int
canon(char *ep, Rune c)
{
switch(c) {
case Kdown:
case Kpgdown:
return SCROLL;
case '\b':
if(sendbufp > sendbuf){
sendbufp = backrune(sendbuf, sendbufp);
*ep++ = '\b';
*ep++ = ' ';
*ep++ = '\b';
}
break;
case 0x15: /* ^U line kill */
sendbufp = sendbuf;
*ep++ = '^';
*ep++ = 'U';
*ep++ = '\n';
break;
case 0x17: /* ^W word kill */
while(sendbufp > sendbuf && !alnum(*sendbufp)) {
sendbufp = backrune(sendbuf, sendbufp);
*ep++ = '\b';
*ep++ = ' ';
*ep++ = '\b';
}
while(sendbufp > sendbuf && alnum(*sendbufp)) {
sendbufp = backrune(sendbuf, sendbufp);
*ep++ = '\b';
*ep++ = ' ';
*ep++ = '\b';
}
break;
case '\177': /* interrupt */
sendbufp = sendbuf;
send_interrupt();
return(NEWLINE);
case '\021': /* quit */
case '\r':
case '\n':
if(sendbufp < &sendbuf[BSIZE])
*sendbufp++ = '\n';
sendnchars((int)(sendbufp-sendbuf), sendbuf);
sendbufp = sendbuf;
if(c == '\n' || c == '\r')
*ep++ = '\n';
*ep = 0;
return(NEWLINE);
case '\004': /* EOT */
if(sendbufp == sendbuf) {
sendnchars(0,sendbuf);
*ep = 0;
return(NEWLINE);
}
/* fall through */
default:
if(sendbufp < &sendbuf[BSIZE-UTFmax])
sendbufp += runetochar(sendbufp, &c);
ep += runetochar(ep, &c);
break;
}
*ep = 0;
return(OTHER);
}
char*
lookfk(struct funckey *fk, char *name)
{
int i;
for(i=0; fk[i].name; i++){
if(strcmp(name, fk[i].name)==0)
return fk[i].sequence;
}
return nil;
}
int
sendfk(char *name)
{
char *s = lookfk(appfk != nil ? appfk : fk, name);
if(s == nil && appfk != nil)
s = lookfk(fk, name);
if(s != nil){
sendnchars(strlen(s), s);
return 1;
}
return 0;
}
int
waitchar(void)
{
static char echobuf[4*BSIZE];
for(;;) {
if(resize_flag)
resize();
if(backp)
return(0);
if(snarffp) {
int c;
if((c = Bgetrune(snarffp)) < 0) {
Bterm(snarffp);
snarffp = nil;
continue;
}
kbdchar = c;
}
if(kbdchar) {
if(backc){
backc = 0;
backup(backc);
}
if(blocked)
resize_flag = 1;
if(cs->raw) {
switch(kbdchar){
case Kins:
if(!sendfk("insert"))
goto Send;
break;
case Kdel:
if(!sendfk("delete"))
goto Send;
break;
case Khome:
if(!sendfk("home"))
goto Send;
break;
case Kend:
if(!sendfk("end"))
goto Send;
break;
case Kpgup:
sendfk("page up");
break;
case Kpgdown:
sendfk("page down");
break;
case Kup:
sendfk("up key");
break;
case Kdown:
sendfk("down key");
break;
case Kleft:
sendfk("left key");
break;
case Kright:
sendfk("right key");
break;
case KF|1:
sendfk("F1");
break;
case KF|2:
sendfk("F2");
break;
case KF|3:
sendfk("F3");
break;
case KF|4:
sendfk("F4");
break;
case KF|5:
sendfk("F5");
break;
case KF|6:
sendfk("F6");
break;
case KF|7:
sendfk("F7");
break;
case KF|8:
sendfk("F8");
break;
case KF|9:
sendfk("F9");
break;
case KF|10:
sendfk("F10");
break;
case KF|11:
sendfk("F11");
break;
case KF|12:
sendfk("F12");
break;
case '\n':
echobuf[0] = '\r';
sendnchars(1, echobuf);
break;
case '\r':
echobuf[0] = '\n';
sendnchars(1, echobuf);
break;
default:
Send:
sendnchars(runetochar(echobuf, &kbdchar), echobuf);
break;
}
} else {
switch(canon(echobuf, kbdchar)){
case SCROLL:
if(!blocked)
bigscroll();
break;
default:
strcat(echo_input,echobuf);
}
}
blocked = 0;
kbdchar = 0;
continue;
} else if(nbrecv(kc->c, &kbdchar))
continue;
if(!blocked){
if(host_avail())
return(rcvchar());
free(hostbuf);
hostbufp = hostbuf = nbrecvp(hc);
if(host_avail() && nrand(8))
return(rcvchar());
}
drawscreen();
drawcursor();
waitio();
}
}
void
waitio(void)
{
enum { AMOUSE, ARESIZE, AKBD, AHOST, AEND, };
Alt a[AEND+1] = {
{ mc->c, &mc->Mouse, CHANRCV },
{ mc->resizec, nil, CHANRCV },
{ kc->c, &kbdchar, CHANRCV },
{ hc, &hostbuf, CHANRCV },
{ nil, nil, CHANEND },
};
if(blocked)
a[AHOST].op = CHANNOP;
else if(hostbuf != nil)
a[AHOST].op = CHANNOBLK;
Next:
if(display->bufp > display->buf)
flushimage(display, 1);
switch(alt(a)){
case AMOUSE:
if(button1())
selection();
else if(button2() || button3())
readmenu();
else if(resize_flag == 0)
goto Next;
break;
case ARESIZE:
resize_flag = 2;
break;
case AHOST:
hostbufp = hostbuf;
if(hostbuf == nil){
close(hostfd);
hostfd = -1;
}
break;
}
}
void
putenvint(char *name, int x)
{
char buf[20];
snprint(buf, sizeof buf, "%d", x);
putenv(name, buf);
}
void
exportsize(void)
{
putenvint("XPIXELS", (xmax+1)*ftsize.x);
putenvint("YPIXELS", (ymax+1)*ftsize.y);
putenvint("LINES", ymax+1);
putenvint("COLS", xmax+1);
putenv("TERM", term);
}
void
setdim(int ht, int wid)
{
int fd;
if(wid > 0) xmax = wid-1;
if(ht > 0) ymax = ht-1;
x = 0;
y = 0;
yscrmin = 0;
yscrmax = ymax;
olines = 0;
margin.x = (Dx(screen->r) - (xmax+1)*ftsize.x) / 2;
margin.y = (Dy(screen->r) - (ymax+1)*ftsize.y) / 2;
free(onscreenrbuf);
onscreenrbuf = mallocz((ymax+1)*(xmax+2)*sizeof(Rune), 1);
free(onscreenabuf);
onscreenabuf = mallocz((ymax+1)*(xmax+2), 1);
free(onscreencbuf);
onscreencbuf = mallocz((ymax+1)*(xmax+2), 1);
clear(0,0,xmax+1,ymax+1);
if(resize_flag || backc)
return;
exportsize();
fd = open("/dev/wctl", OWRITE);
if(fd >= 0){
ht = (ymax+1) * ftsize.y + 2*INSET + 2*Borderwidth;
wid = (xmax+1) * ftsize.x + ftsize.x + 2*INSET + 2*Borderwidth;
fprint(fd, "resize -dx %d -dy %d\n", wid, ht);
close(fd);
}
}
void
resize(void)
{
if(resize_flag > 1 && getwindow(display, Refnone) < 0){
fprint(2, "can't reattach to window: %r\n");
exits("can't reattach to window");
}
setdim((Dy(screen->r) - 2*INSET)/ftsize.y, (Dx(screen->r) - 2*INSET - ftsize.x)/ftsize.x);
exportsize();
if(resize_flag > 1)
backup(backc);
resize_flag = 0;
werrstr(""); /* clear spurious error messages */
}
void
sendsnarf(void)
{
if(snarffp == nil)
snarffp = Bopen("/dev/snarf",OREAD);
}
int
writesnarf(Rune *s, Rune *e)
{
Biobuf *b;
int z, p;
if(s >= e)
return 0;
b = Bopen("/dev/snarf", OWRITE|OTRUNC);
if(b == nil)
return 0;
for(z = p = 0; s < e; s++){
if(*s){
if(*s == '\n')
z = p = 0;
else if(p++ == 0){
while(z-- > 0) Bputc(b, ' ');
}
Bputrune(b, *s);
} else {
z++;
}
}
Bterm(b);
return 1;
}
Rectangle
drawselection(Rectangle r, Rectangle d, Image *color)
{
while(r.min.y < r.max.y){
d = drawselection(Rect(r.min.x, r.min.y, xmax+1, r.min.y), d, color);
r.min.x = 0;
r.min.y++;
}
if(r.min.x >= r.max.x)
return d;
r = Rpt(pt(r.min.x, r.min.y), pt(r.max.x, r.max.y+1));
draw(screen, r, color, highlight, r.min);
combinerect(&d, r);
return d;
}
void
selection(void)
{
Point p, q;
Rectangle r, d;
Image *backup;
backup = allocimage(display, screen->r, screen->chan, 0, DNofill);
draw(backup, backup->r, screen, nil, backup->r.min);
p = pos(mc->xy);
do {
q = pos(mc->xy);
if(onscreenr(p.x, p.y) > onscreenr(q.x, q.y)){
r.min = q;
r.max = p;
} else {
r.min = p;
r.max = q;
}
if(r.max.y > ymax)
r.max.x = 0;
d = drawselection(r, ZR, red);
flushimage(display, 1);
readmouse(mc);
draw(screen, d, backup, nil, d.min);
} while(button1());
if((mc->buttons & 07) == 5)
sendsnarf();
else if(writesnarf(onscreenr(r.min.x, r.min.y), onscreenr(r.max.x, r.max.y))){
d = drawselection(r, ZR, green);
flushimage(display, 1);
sleep(200);
draw(screen, d, backup, nil, d.min);
}
freeimage(backup);
}
void
readmenu(void)
{
if(button3()) {
menu3.item[1] = ttystate[cs->raw].crnl ? "cr" : "crnl";
menu3.item[2] = ttystate[cs->raw].nlcr ? "nl" : "nlcr";
menu3.item[3] = cs->raw ? "cooked" : "raw";
switch(menuhit(3, mc, &menu3, nil)) {
case 0: /* 24x80 */
setdim(24, 80);
return;
case 1: /* newline after cr? */
ttystate[cs->raw].crnl = !ttystate[cs->raw].crnl;
return;
case 2: /* cr after newline? */
ttystate[cs->raw].nlcr = !ttystate[cs->raw].nlcr;
return;
case 3: /* switch raw mode */
cs->raw = !cs->raw;
return;
case 4:
exits(0);
}
return;
}
menu2.item[5] = pagemode? "scroll": "page";
switch(menuhit(2, mc, &menu2, nil)) {
case 0: /* back up */
if(atend == 0) {
backc++;
backup(backc);
}
return;
case 1: /* move forward */
backc--;
if(backc >= 0)
backup(backc);
else
backc = 0;
return;
case 2: /* reset */
backc = 0;
backup(0);
return;
case 3: /* clear screen */
resize_flag = 1;
return;
case 4: /* send the snarf buffer */
sendsnarf();
return;
case 5: /* pause and clear at end of screen */
pagemode = 1-pagemode;
if(blocked && !pagemode) {
resize_flag = 1;
blocked = 0;
}
return;
}
}
void
backup(int count)
{
Rune *cp;
int n;
resize_flag = 1;
if(count == 0 && !pagemode) {
n = ymax;
nbacklines = HISTSIZ; /* make sure we scroll to the very end */
} else{
n = 3*(count+1)*ymax/4;
nbacklines = ymax-1;
}
cp = histp;
atend = 0;
while (n >= 0) {
cp--;
if(cp < hist)
cp = &hist[HISTSIZ-1];
if(*cp == '\0') {
atend = 1;
break;
}
if(*cp == '\n')
n--;
}
cp++;
if(cp >= &hist[HISTSIZ])
cp = hist;
backp = cp;
}
Point
pt(int x, int y)
{
return addpt(screen->r.min, Pt(x*ftsize.x+margin.x,y*ftsize.y+margin.y));
}
Point
pos(Point pt)
{
pt.x -= screen->r.min.x + margin.x;
pt.y -= screen->r.min.y + margin.y;
pt.x /= ftsize.x;
pt.y /= ftsize.y;
if(pt.x < 0)
pt.x = 0;
else if(pt.x > xmax+1)
pt.x = xmax+1;
if(pt.y < 0)
pt.y = 0;
else if(pt.y > ymax+1)
pt.y = ymax+1;
return pt;
}
void
shift(int x1, int y, int x2, int w)
{
if(x1+w > xmax+1)
w = xmax+1 - x1;
if(x2+w > xmax+1)
w = xmax+1 - x2;
memmove(onscreenr(x1, y), onscreenr(x2, y), w*sizeof(Rune));
memmove(onscreena(x1, y), onscreena(x2, y), w);
memmove(onscreenc(x1, y), onscreenc(x2, y), w);
}
void
scroll(int sy, int ly, int dy, int cy) /* source, limit, dest, which line to clear */
{
memmove(onscreenr(0, dy), onscreenr(0, sy), (ly-sy)*(xmax+2)*sizeof(Rune));
memmove(onscreena(0, dy), onscreena(0, sy), (ly-sy)*(xmax+2));
memmove(onscreenc(0, dy), onscreenc(0, sy), (ly-sy)*(xmax+2));
clear(0, cy, xmax+1, cy+1);
}
void
bigscroll(void) /* scroll up half a page */
{
int half = ymax/3;
if(x == 0 && y == 0)
return;
if(y < half) {
clear(0, 0, xmax+1, ymax+1);
x = y = 0;
return;
}
memmove(onscreenr(0, 0), onscreenr(0, half), (ymax-half+1)*(xmax+2)*sizeof(Rune));
memmove(onscreena(0, 0), onscreena(0, half), (ymax-half+1)*(xmax+2));
memmove(onscreenc(0, 0), onscreenc(0, half), (ymax-half+1)*(xmax+2));
clear(0, y-half+1, xmax+1, ymax+1);
y -= half;
if(olines)
olines -= half;
}
int
number(Rune *p, int *got)
{
int c, n = 0;
if(got)
*got = 0;
while ((c = get_next_char()) >= '0' && c <= '9'){
if(got)
*got = 1;
n = n*10 + c - '0';
}
*p = c;
return(n);
}
/* stubs */
void
sendnchars(int n,char *p)
{
if(hostfd < 0)
return;
if(write(hostfd,p,n) < 0){
close(hostfd);
hostfd = -1;
}
}
int
host_avail(void)
{
if(*echop != 0 && fullrune(echop, strlen(echop)))
return 1;
if(hostbuf == nil)
return 0;
return *hostbufp != 0;
}
int
rcvchar(void)
{
Rune r;
if(*echop != 0) {
echop += chartorune(&r, echop);
if(*echop == 0) {
echop = echo_input;
*echop = 0;
}
return r;
}
return *hostbufp++;
}
void
ringbell(void){
}
int
alnum(int c)
{
if(c >= 'a' && c <= 'z')
return 1;
if(c >= 'A' && c <= 'Z')
return 1;
if(c >= '0' && c <= '9')
return 1;
return 0;
}
void
escapedump(int fd,uchar *str,int len)
{
int i;
for(i = 0; i < len; i++) {
if((str[i] < ' ' || str[i] > '\177') &&
str[i] != '\n' && str[i] != '\t') fprint(fd,"^%c",str[i]+64);
else if(str[i] == '\177') fprint(fd,"^$");
else if(str[i] == '\n') fprint(fd,"^J\n");
else fprint(fd,"%c",str[i]);
}
}
void
drawstring(Rune *str, int n)
{
memmove(onscreenr(x, y), str, n*sizeof(Rune));
memset(onscreena(x, y), attr & 0xFF, n);
memset(onscreenc(x, y), attr >> 8, n);
}