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implement ToFD,Mainmodule;
include "sys.m";
sys: Sys;
include "draw.m";
include "sh.m";
include "alphabet/reports.m";
reports: Reports;
Report: import reports;
include "alphabet.m";
alphabet: Alphabet;
Value: import alphabet;
ToFD: module {};
typesig(): string
{
return "fw";
}
init()
{
alphabet = load Alphabet Alphabet->PATH;
reports = load Reports Reports->PATH;
}
quit()
{
}
run(nil: ref Draw->Context, r: ref Reports->Report, nil: chan of string,
nil: list of (int, list of ref Alphabet->Value),
args: list of ref Alphabet->Value): ref Alphabet->Value
{
sys = load Sys Sys->PATH;
f := chan of ref Sys->FD;
spawn tofdproc(f, (hd args).w().i, r.start("2fd"));
return ref Value.Vf(f);
}
tofdproc(f, w: chan of ref Sys->FD, errorc: chan of string)
{
fd0 := <-w;
f <-= fd0;
fd1 := <-f;
if(fd1 == nil) # asked to quit? tell w to quit too.
w <-= nil;
else
if(fd0 == nil) # no proposed fd? give 'em the one we've just got.
w <-= fd1;
else{ # otherwise one-way stream from w to f.
w <-= nil;
buf := array[Sys->ATOMICIO] of byte;
while((n := sys->read(fd0, buf, len buf)) > 0){
if(sys->write(fd1, buf, n) == -1){
reports->report(errorc, sys->sprint("write error: %r"));
break;
}
}
}
reports->quit(errorc);
}
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