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# promptstring
RAWON_STR := "*";
RAWON : con 0;
RAWOFF : con 1;
promptstring(prompt, def: string, mode: int): string
{
if(mode == RAWON || def == nil)
sys->fprint(stdout, "%s: ", prompt);
else
sys->fprint(stdout, "%s [%s]: ", prompt, def);
(eof, resp) := readline(stdin, mode);
if(eof)
exit;
if(resp == nil)
return def;
return resp;
}
readline(fd: ref Sys->FD, mode: int): (int, string)
{
i: int;
eof: int;
fdctl: ref Sys->FD;
eof = 0;
buf := array[128] of byte;
tmp := array[128] of byte;
if(mode == RAWON){
fdctl = sys->open("/dev/consctl", sys->OWRITE);
if(fdctl == nil || sys->write(fdctl,array of byte "rawon",5) != 5){
sys->fprint(stderr, "unable to change console mode");
return (1,nil);
}
}
for(sofar := 0; sofar < 128; sofar += i){
i = sys->read(fd, tmp, 128 - sofar);
if(i <= 0){
eof = 1;
break;
}
if(tmp[i-1] == byte '\n'){
for(j := 0; j < i-1; j++){
buf[sofar+j] = tmp[j];
if(mode == RAWON && RAWON_STR != nil)
sys->write(stdout,array of byte RAWON_STR,1);
}
sofar += j;
if(mode == RAWON)
sys->write(stdout,array of byte "\n",1);
break;
}
else {
for(j := 0; j < i; j++){
buf[sofar+j] = tmp[j];
if(mode == RAWON && RAWON_STR != nil)
sys->write(stdout,array of byte RAWON_STR,1);
}
}
}
if(mode == RAWON)
sys->write(fdctl,array of byte "rawoff",6);
return (eof, string buf[0:sofar]);
}
# from keyfs
readconsline(prompt: string, raw: int): (string, string)
{
fd := sys->open("/dev/cons", Sys->ORDWR);
if(fd == nil)
return (nil, sys->sprint("can't open cons: %r"));
sys->fprint(fd, "%s", prompt);
fdctl: ref Sys->FD;
if(raw){
fdctl = sys->open("/dev/consctl", sys->OWRITE);
if(fdctl == nil || sys->fprint(fdctl, "rawon") < 0)
return (nil, sys->sprint("can't open consctl: %r"));
}
line := array[256] of byte;
o := 0;
err: string;
buf := array[1] of byte;
Read:
while((r := sys->read(fd, buf, len buf)) > 0){
c := int buf[0];
case c {
16r7F =>
err = "interrupt";
break Read;
'\b' =>
if(o > 0)
o--;
'\n' or '\r' or 16r4 =>
break Read;
* =>
if(o > len line){
err = "line too long";
break Read;
}
line[o++] = byte c;
}
}
sys->fprint(fd, "\n");
if(r < 0)
err = sys->sprint("can't read cons: %r");
if(raw)
sys->fprint(fdctl, "rawoff");
if(err != nil)
return (nil, err);
return (string line[0:o], err);
}
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