ref: 1146757bfd9088ff4955a1d896ec7b5d4c894f2d
dir: /zuke.c/
#include "theme.c"
#include <mouse.h>
#include <keyboard.h>
#include <ctype.h>
#include "plist.h"
typedef struct Player Player;
enum
{
Cstart = 1,
Cstop,
Ctoggle,
Cforward,
Cbackward,
Cforwardfast,
Cbackwardfast,
Everror = 1,
Evready,
Bps = 44100*2*2, /* 44100KHz, stereo, s16 for a sample */
Seekbytes = Bps*10, /* 10 seconds */
Seekbytesfast = Bps*60, /* 1 minute */
Scrollwidth = 14,
Scrollheight = 16,
Relbufsz = Bps/5, /* 0.2 second */
};
static Meta *pl;
static int plnum;
static char *plraw;
static int plrawsize;
static int volume;
struct Player
{
Channel *ctl;
Channel *ev;
Channel *img;
int pcur;
};
int mainstacksize = 32768;
static int audio;
static u64int byteswritten;
static int pcur, pcurplaying;
static int scroll, scrollsz;
static Font *f;
static Image *cover;
static Channel *ev;
static Mousectl *mctl;
static Keyboardctl *kctl;
static int entering;
static int colwidth[3];
static int mincolwidth[3];
static char *covers[] = {"folder", "cover", "Cover", "scans/CD", "Scans/Front", "Covers/Front"};
static char *menu3i[] = {
"theme",
"exit",
nil
};
static Menu menu3 = {
.item = menu3i,
};
#pragma varargck type "P" int
static int
positionfmt(Fmt *f)
{
char *s, tmp[16];
u64int sec;
s = tmp;
sec = va_arg(f->args, int);
if(sec >= 3600){
s = seprint(s, tmp+sizeof(tmp), "%02lld:", sec/3600);
sec %= 3600;
}
s = seprint(s, tmp+sizeof(tmp), "%02lld:", sec/60);
sec %= 60;
seprint(s, tmp+sizeof(tmp), "%02lld", sec);
return fmtstrcpy(f, tmp);
}
static void
adjustcolumns(void)
{
int i, x, total;
if(mincolwidth[0] == 0){
mincolwidth[0] = mincolwidth[1] = mincolwidth[2] = 1;
for(i = 0; i < plnum; i++){
if((x = stringwidth(f, pl[i].artist[0])) > mincolwidth[0])
mincolwidth[0] = x;
if((x = stringwidth(f, pl[i].album)) > mincolwidth[1])
mincolwidth[1] = x;
if((x = stringwidth(f, pl[i].title)) > mincolwidth[2])
mincolwidth[2] = x;
}
}
total = mincolwidth[0] + mincolwidth[1] + mincolwidth[2];
for(i = 0; i < nelem(mincolwidth); i++)
colwidth[i] = (Dx(screen->r) - 8) * mincolwidth[i] / total;
}
static void
redraw(void)
{
Image *col;
Point p, sp;
Rectangle sel, r;
int i, left, scrollcenter;
char tmp[32];
if(entering)
return;
lockdisplay(display);
draw(screen, screen->r, colors[Dback].im, nil, ZP);
scrollsz = Dy(screen->r) / f->height - 1;
adjustcolumns();
left = screen->r.min.x;
if(scrollsz < plnum){ /* add a scrollbar */
p.x = sp.x = screen->r.min.x + Scrollwidth;
p.y = screen->r.min.y;
sp.y = screen->r.max.y;
line(screen, p, sp, Endsquare, Endsquare, 0, colors[Dfmed].im, ZP);
r = screen->r;
r.max.x = r.min.x + Scrollwidth - 1;
r.min.x += 1;
if(scroll < 1)
scrollcenter = 0;
else
scrollcenter = (Dy(screen->r)-Scrollheight*5/4)*scroll / (plnum - scrollsz);
r.min.y += scrollcenter + Scrollheight/4;
r.max.y = r.min.y + Scrollheight;
draw(screen, r, colors[Dfmed].im, nil, ZP);
left += Scrollwidth + 4;
}
p.x = sp.x = left + colwidth[0] + 4;
p.y = 0;
sp.y = screen->r.max.y;
line(screen, p, sp, Endsquare, Endsquare, 0, colors[Dfmed].im, ZP);
p.x = sp.x = left + colwidth[0] + 8 + colwidth[1] + 4;
p.y = 0;
sp.y = screen->r.max.y;
line(screen, p, sp, Endsquare, Endsquare, 0, colors[Dfmed].im, ZP);
sp.x = sp.y = 0;
p.x = left + 2;
p.y = screen->r.min.y + 2;
for(i = scroll; i < plnum; i++, p.y += f->height){
if(i < 0)
continue;
if(p.y > screen->r.max.y)
break;
if(pcur == i){
sel.min.x = left;
sel.min.y = p.y;
sel.max.x = screen->r.max.x;
sel.max.y = p.y + f->height;
draw(screen, sel, colors[Dbinv].im, nil, ZP);
col = colors[Dfinv].im;
}else{
col = colors[pcurplaying == i ? Dfhigh : Dfmed].im;
}
sel = screen->r;
r = screen->r;
p.x = left + 2;
sel.max.x = p.x + colwidth[0];
replclipr(screen, 0, sel);
string(screen, p, col, sp, f, pl[i].artist[0]);
p.x += colwidth[0] + 8;
sel.min.x = p.x;
sel.max.x = p.x + colwidth[1];
replclipr(screen, 0, sel);
string(screen, p, col, sp, f, pl[i].album);
p.x += colwidth[1] + 8;
sel.min.x = p.x;
sel.max.x = p.x + colwidth[2];
replclipr(screen, 0, sel);
string(screen, p, col, sp, f, pl[i].title);
replclipr(screen, 0, r);
if(pcurplaying == i){
Point rightp, leftp;
leftp.y = rightp.y = p.y - 1;
leftp.x = left;
rightp.x = screen->r.max.x;
line(screen, leftp, rightp, 0, 0, 0, colors[Dfmed].im, sp);
leftp.y = rightp.y = p.y + f->height;
line(screen, leftp, rightp, 0, 0, 0, colors[Dfmed].im, sp);
}
}
if(cover != nil){
r = screen->r;
r.min.x = r.max.x - cover->r.max.x - 8;
r.min.y = r.max.y - cover->r.max.y - 8 - f->height - 4;
draw(screen, r, colors[Dblow].im, nil, ZP);
r.min.x += 4;
r.min.y += 4;
r.max.x -= 4;
r.max.y -= 4;
draw(screen, r, cover, nil, ZP);
}
if(pcurplaying >= 0)
snprint(tmp, sizeof(tmp), "%P/%P %d%%", (int)(byteswritten/Bps), pl[pcurplaying].duration/1000, volume);
else
snprint(tmp, sizeof(tmp), "%d%%", volume);
r = screen->r;
r.min.x = r.max.x - stringwidth(f, tmp) - 4;
r.min.y = r.max.y - f->height - 4;
draw(screen, r, colors[Dblow].im, nil, ZP);
r.min.x += 2;
r.min.y += 2;
string(screen, r.min, colors[Dfhigh].im, sp, f, tmp);
flushimage(display, 1);
unlockdisplay(display);
}
void
themechanged(void)
{
redraw();
}
static void
coverload(void *player_)
{
int p[2], pid, fd, i;
char *prog, *path, *s, tmp[32];
Meta *m;
Channel *ch;
Player *player;
Image *newcover;
threadsetname("cover");
player = player_;
m = &pl[player->pcur];
pid = -1;
ch = player->img;
fd = -1;
prog = nil;
if(m->imagefmt != nil && m->imagereader == 0){
if(strcmp(m->imagefmt, "image/png") == 0)
prog = "png";
else if(strcmp(m->imagefmt, "image/jpeg") == 0)
prog = "jpg";
}
if(prog == nil){
path = strdup(m->path);
if(path != nil && (s = utfrrune(path, '/')) != nil){
*s = 0;
for(i = 0; i < nelem(covers) && prog == nil; i++){
if((s = smprint("%s/%s.jpg", path, covers[i])) != nil && (fd = open(s, OREAD)) >= 0)
prog = "jpg";
free(s);
s = nil;
if(fd < 0 && (s = smprint("%s/%s.png", path, covers[i])) != nil && (fd = open(s, OREAD)) >= 0)
prog = "png";
free(s);
}
}
free(path);
}
if(prog == nil)
goto done;
if(fd < 0){
fd = open(m->path, OREAD);
seek(fd, m->imageoffset, 0);
}
pipe(p);
if((pid = rfork(RFPROC|RFFDG|RFREND|RFNOTEG)) == 0){
dup(fd, 0); close(fd);
dup(p[1], 1); close(p[1]);
dup(open("/dev/null", OWRITE), 2);
snprint(tmp, sizeof(tmp), "%s -9t | resample -x128", prog);
execl("/bin/rc", "rc", "-c", tmp, nil);
sysfatal("execl: %r");
}
close(fd);
close(p[1]);
if(pid > 0){
newcover = readimage(display, p[0], 1);
sendp(ch, newcover);
}
close(p[0]);
done:
if(pid < 0)
sendp(ch, nil);
chanclose(ch);
chanfree(ch);
if(pid >= 0)
postnote(PNGROUP, pid, "interrupt");
threadexits(nil);
}
static Player *playernext;
static Player *playercurr;
static int
playerret(Player *player)
{
return recvul(player->ev) == Everror ? -1 : 0;
}
static void
stop(Player *player)
{
if(player == nil)
return;
if(player == playernext)
playernext = nil;
sendul(player->ctl, Cstop);
}
static void playerthread(void *player_);
static Player *
newplayer(int pcur, int loadnext)
{
Player *player;
if(playernext != nil && loadnext){
if(pcur == playernext->pcur){
player = playernext;
playernext = nil;
goto done;
}
stop(playernext);
playernext = nil;
}
player = mallocz(sizeof(*player), 1);
player->ctl = chancreate(sizeof(ulong), 0);
player->ev = chancreate(sizeof(ulong), 0);
player->pcur = pcur;
threadcreate(playerthread, player, mainstacksize);
if(playerret(player) < 0)
return nil;
done:
if(pcur < plnum-1 && playernext == nil && loadnext)
playernext = newplayer(pcur+1, 0);
return player;
}
static int
start(Player *player)
{
if(player != nil)
sendul(player->ctl, Cstart);
return -1;
}
static void
playerthread(void *player_)
{
char *buf, cmd[32];
Player *player;
Ioproc *io;
Image *thiscover;
ulong c;
int p[2], fd, pid, n, got, noinit, trycoverload;
u64int bytesfrom, bf;
threadsetname("player");
player = player_;
noinit = 0;
bytesfrom = 0;
c = 0;
buf = nil;
trycoverload = 1;
io = nil;
pid = -1;
restart:
if((fd = open(pl[player->pcur].path, OREAD)) < 0){
fprint(2, "%r\n");
sendul(player->ev, Everror);
goto freeplayer;
}
pipe(p);
if((pid = rfork(RFPROC|RFFDG|RFREND|RFNOTEG)) == 0){
dup(p[0], 1); close(p[0]);
dup(fd, 0); close(fd);
dup(open("/dev/null", OWRITE), 2);
close(p[1]);
snprint(cmd, sizeof(cmd), "/bin/audio/%sdec", pl[player->pcur].filefmt);
execl(cmd, cmd, nil);
sysfatal("execl: %r");
}
if(pid < 0)
sysfatal("rfork: %r");
close(fd);
close(p[0]);
byteswritten = 0;
if(!noinit){
sendul(player->ev, Evready);
buf = malloc(Relbufsz);
io = ioproc();
for(c = 0, got = 0; got < Relbufsz; got += n){
if((c = nbrecvul(player->ctl)) != 0)
break;
n = ioread(io, p[1], buf+got, Relbufsz-got);
if(n < 1)
break;
}
if(c == 0)
c = recvul(player->ctl);
if(c != Cstart)
goto freeplayer;
iowrite(io, audio, buf, got);
byteswritten = got;
bytesfrom = 0;
c = 0;
noinit = 1;
}
pcurplaying = player->pcur;
if(c != Cbackward && c != Cbackwardfast)
redraw();
while(1){
n = Relbufsz;
if(bytesfrom > byteswritten && n > bytesfrom-byteswritten)
n = bytesfrom-byteswritten;
n = ioread(io, p[1], buf, n);
if(n < 1)
break;
thiscover = nil;
if(player->img != nil && nbrecv(player->img, &thiscover) != 0){
freeimage(cover);
cover = thiscover;
redraw();
player->img = nil;
}
c = nbrecvul(player->ctl);
bf = bytesfrom != 0 ? bytesfrom : byteswritten;
if(c == Cstop || c == -1)
goto stop;
if(c == Ctoggle){
c = recvul(player->ctl);
if(c == Cstop)
goto stop;
}else if(c == Cforward){
bytesfrom = bf + Seekbytes;
}else if(c == Cforwardfast){
bytesfrom = bf + Seekbytesfast;
}else if(c == Cbackward){ /* to seek backwards we need to restart playback */
bytesfrom = bf >= Seekbytes ? bf - Seekbytes : 0;
n = 0; /* not an error */
break;
}else if(c == Cbackwardfast){
bytesfrom = bf >= Seekbytesfast ? bf - Seekbytesfast : 0;
n = 0; /* not an error */
break;
}
c = 0;
if(bytesfrom <= byteswritten){
if(bytesfrom == byteswritten)
bytesfrom = 0;
if(iowrite(io, audio, buf, n) != n){
fprint(2, "failed to write %d bytes: %r\n", n);
break;
}
if(trycoverload && byteswritten >= Bps){
player->img = chancreate(sizeof(Image*), 0);
proccreate(coverload, player, 4096);
trycoverload = 0;
}
}
byteswritten += n;
if(bytesfrom == byteswritten || (byteswritten/Bps > (byteswritten-n)/Bps))
redraw();
}
if(n == 0){ /* seeking backwards or end of the song */
close(p[1]);
if(c != Cbackward && c != Cbackwardfast){
playercurr = nil;
playercurr = newplayer((player->pcur+1) % plnum, 1);
start(playercurr);
goto stop;
}
goto restart;
}
stop:
if(player->img != nil)
freeimage(recvp(player->img));
freeplayer:
if(player == playercurr)
playercurr = nil;
if(player == playernext)
playernext = nil;
chanclose(player->ctl);
chanclose(player->ev);
chanfree(player->ctl);
chanfree(player->ev);
close(p[1]);
closeioproc(io);
free(buf);
free(player);
if(pid >= 0)
postnote(PNGROUP, pid, "interrupt");
threadexits(nil);
}
static void
toggle(Player *player)
{
if(player != nil)
sendul(player->ctl, Ctoggle);
}
static void
backward(Player *player)
{
if(player != nil)
sendul(player->ctl, Cbackward);
}
static void
forward(Player *player)
{
if(player != nil)
sendul(player->ctl, Cforward);
}
static void
backwardfast(Player *player)
{
if(player != nil)
sendul(player->ctl, Cbackwardfast);
}
static void
forwardfast(Player *player)
{
if(player != nil)
sendul(player->ctl, Cforwardfast);
}
static void
readplist(void)
{
Meta *m;
char *s, *e, *endrec;
int i, n, sz, alloc, tagsz, intval;
s = nil;
for(alloc = sz = 0;;){
alloc += 65536;
if((s = realloc(s, alloc)) == nil)
sysfatal("no memory");
for(n = 0; sz < alloc; sz += n){
n = read(0, s+sz, alloc-sz);
if(n < 0)
sysfatal("%r");
if(n == 0)
break;
}
if(n == 0)
break;
}
plraw = s;
plrawsize = sz;
plraw[plrawsize-1] = 0;
if(sz < 4 || s[0] != '#' || s[1] != ' ' || !isdigit(s[2]) || (s = memchr(plraw, '\n', sz)) == nil)
sysfatal("invalid playlist");
s++; /* at the start of the first record */
plnum = atoi(plraw+2);
pl = calloc(plnum, sizeof(Meta));
for(i = 0; i < plnum; i++, s = endrec){
if(plraw+plrawsize < s+10)
sysfatal("truncated playlist");
if(s[0] != '#' || s[1] != ' ' || !isdigit(s[2]))
sysfatal("invalid record");
if((n = strtol(s+2, &e, 10)) < 0 || n > plnum)
sysfatal("invalid track index");
if(pl[n].path != nil)
sysfatal("duplicate track index");
s[-1] = 0;
sz = strtol(e, &s, 10);
*s++ = 0; /* skip '\n' */
if(s+sz > plraw+plrawsize)
sysfatal("truncated playlist");
s[sz-1] = 0; /* '\n'→'\0' to mark the end of the record */
endrec = s+sz;
m = &pl[n];
for(;;){
if(s[0] == Pimage){
m->imageoffset = strtol(s+2, &e, 10);
m->imagesize = strtol(e+1, &s, 10);
m->imagereader = strtol(s+1, &e, 10);
m->imagefmt = e + 1;
s = strchr(e+2, '\n') + 1;
}else if(s[0] == Pchannels || s[0] == Pduration || s[0] == Psamplerate){
intval = strtol(s+2, &e, 10);
if(s[0] == Pduration) m->duration = intval;
s = e + 1;
}else if(s[0] == Ppath){
m->path = s+2;
break; /* always the last one */
}else if(s[0] == Pfilefmt){
m->filefmt = s+2;
s = strchr(s+2, '\n') + 1;
}else{
tagsz = strtol(s+1, &e, 10);
if(e+tagsz >= plraw+plrawsize)
sysfatal("truncated playlist");
e++; /* point to tag value */
e[tagsz] = 0; /* '\n'→'\0' to mark the end of the tag value */
if(s[0] == Palbum) m->album = e;
else if(s[0] == Partist && m->numartist < Maxartist) m->artist[m->numartist++] = e;
else if(s[0] == Pdate) m->date = e;
else if(s[0] == Ptitle) m->title = e;
else if(s[0] == Pdate) m->date = e;
else if(s[0] == Ptrack) m->track = e;
else sysfatal("unknown tag type %c", s[0]);
s = e + tagsz + 1;
}
s[-1] = 0;
}
if(m->filefmt == nil)
sysfatal("old playlist format?\nplease re-run audio/mkplist");
}
}
static void
search(char d)
{
char *s, *snext;
static char buf[48];
static int sz;
int inc;
inc = (d == '/' || d == 'n') ? 1 : -1;
if(d == '/' || d == '?'){
entering = 1;
sz = enter(inc > 0 ? "forward:" : "backward:", buf, sizeof(buf), mctl, kctl, nil);
entering = 0;
}
if(sz < 1 || (inc > 0 && pcur >= plnum-1) || (inc < 0 && pcur < 1))
return;
s = pl[pcur + (inc > 0 ? 0 : -1)].path;
s += strlen(s) + 1;
for(; s > plraw && s < plraw+plrawsize-sz; s += inc){
if(cistrncmp(s, buf, sz) != 0)
continue;
snext = s;
for(; s != plraw && *s; s--);
if(s == plraw || (s[1] != Partist && s[1] != Palbum && s[1] != Ptitle && s[1] != Pdate)){
if(inc > 0)
s = snext;
continue;
}
for(s--; s != plraw; s--){
if(memcmp(s, "\0# ", 3) == 0 && isdigit(s[3])){
pcur = atoi(s+3);
redraw();
return;
}
}
break;
}
}
static void
chvolume(int d)
{
int f, l, r, ol, or;
Biobuf b;
char *s, *a[4];
if((f = open("/dev/volume", ORDWR)) < 0)
return;
Binit(&b, f, OREAD);
l = r = 0;
for(; (s = Brdline(&b, '\n')) != nil;) {
if(strncmp(s, "master", 6) == 0 && tokenize(s, a, 3) == 3){
l = ol = atoi(a[1]);
r = or = atoi(a[2]);
for(;;){
l += d;
r += d;
fprint(f, "master %d %d\n", l, r);
Bseek(&b, 0, 0);
for(; (s = Brdline(&b, '\n')) != nil;){
if(strncmp(s, "master", 6) == 0 && tokenize(s, a, 3) == 3){
if(atoi(a[1]) == l && atoi(a[2]) == r)
goto end;
if(atoi(a[1]) != ol && atoi(a[2]) != or)
goto end;
if (l < 0 || r < 0 || l > 100 || r > 100)
goto end;
break;
}
}
}
}
}
end:
volume = (l+r)/2;
if(volume > 100)
volume = 100;
else if(volume < 0)
volume = 0;
Bterm(&b);
close(f);
}
void
threadmain(int argc, char **argv)
{
char tmp[256];
Rune key;
Mouse m;
Alt a[] =
{
{ nil, &m, CHANRCV },
{ nil, nil, CHANRCV },
{ nil, &key, CHANRCV },
{ nil, nil, CHANEND },
};
int fd, n, scrolling, oldpcur, oldbuttons;
USED(argc); USED(argv);
audio = open("/dev/audio", OWRITE);
if(audio < 0)
sysfatal("audio: %r");
readplist();
if(plnum < 1){
fprint(2, "empty playlist\n");
sysfatal("empty");
}
if(initdraw(nil, nil, "zuke") < 0)
sysfatal("initdraw: %r");
unlockdisplay(display);
if((mctl = initmouse(nil, screen)) == nil)
sysfatal("initmouse: %r");
if((kctl = initkeyboard(nil)) == nil)
sysfatal("initkeyboard: %r");
a[0].c = mctl->c;
a[1].c = mctl->resizec;
a[2].c = kctl->c;
f = display->defaultfont;
srand(time(0));
pcurplaying = -1;
chvolume(0);
fmtinstall('P', positionfmt);
threadsetname("zuke");
snprint(tmp, sizeof(tmp), "/proc/%d/ctl", getpid());
if((fd = open(tmp, OWRITE)) >= 0){
fprint(fd, "pri 13\n");
close(fd);
}
themeinit();
redraw();
oldbuttons = 0;
scrolling = 0;
for(;;){
oldpcur = pcur;
switch(alt(a)){
case 0:
if(oldbuttons == 0 && m.buttons == 2 && m.xy.x <= screen->r.min.x+Scrollwidth)
scrolling = 1;
else if(m.buttons != 2)
scrolling = 0;
oldbuttons = m.buttons;
if(m.buttons == 0)
break;
if(scrolling){
if(scrollsz >= plnum)
break;
scroll = (m.xy.y - screen->r.min.y - Scrollheight/4)*(plnum-scrollsz) / (Dy(screen->r)-Scrollheight/2);
if(scroll > plnum-scrollsz-1)
scroll = plnum-scrollsz-1;
if(scroll < 0)
scroll = 0;
redraw();
}else if(m.buttons != 4){
pcur = scroll + (m.xy.y - screen->r.min.y)/f->height;
if(m.buttons == 2){
stop(playercurr);
playercurr = newplayer(pcur, 1);
start(playercurr);
}
}else if((n = menuhit(3, mctl, &menu3, nil)) >= 0){
if(n == 0)
proccreate(themeproc, redraw, 4096);
else if(n == 1)
goto end;
}
break;
case 1: /* resize */
if(getwindow(display, Refnone) < 0)
sysfatal("getwindow: %r");
redraw();
break;
case 2:
switch(key){
case Kleft:
backward(playercurr);
break;
case Kright:
forward(playercurr);
break;
case ',':
backwardfast(playercurr);
break;
case '.':
forwardfast(playercurr);
break;
case Kup:
pcur--;
break;
case Kpgup:
pcur -= scrollsz;
break;
case Kdown:
pcur++;
break;
case Kpgdown:
pcur += scrollsz;
break;
case Kend:
pcur = plnum-1;
break;
case Khome:
pcur = 0;
break;
case 10:
stop(playercurr);
playercurr = newplayer(pcur, 1);
start(playercurr);
break;
case 'q': case Kdel:
stop(playercurr);
goto end;
case 'o':
if(pcur == pcurplaying)
oldpcur = -1;
pcur = pcurplaying;
break;
case '>':
if(playercurr == nil)
break;
pcur = pcurplaying;
if(++pcur >= plnum)
pcur = 0;
stop(playercurr);
playercurr = newplayer(pcur, 1);
start(playercurr);
break;
case '<':
if(playercurr == nil)
break;
pcur = pcurplaying;
if(--pcur < 0)
pcur = plnum-1;
stop(playercurr);
playercurr = newplayer(pcur, 1);
start(playercurr);
break;
case '-':
chvolume(-1);
redraw();
break;
case '+':
chvolume(+1);
redraw();
break;
case 's':
stop(playercurr);
playercurr = nil;
pcurplaying = -1;
freeimage(cover);
cover = nil;
redraw();
break;
case 'p':
toggle(playercurr);
break;
case '/': case '?': case 'n': case 'N':
search(key);
break;
}
}
if(pcur != oldpcur){
if(pcur < 0)
pcur = 0;
else if(pcur >= plnum)
pcur = plnum - 1;
if(pcur < scroll)
scroll = pcur;
else if(pcur > scroll + scrollsz)
scroll = pcur - scrollsz;
if(scroll > plnum - scrollsz)
scroll = plnum - scrollsz;
if(scroll < 0)
scroll = 0;
if(pcur != oldpcur)
redraw();
}
}
end:
threadexitsall(nil);
}