20060303a

1 files changed, 111 insertions, 0 deletions

diff --git a/appl/cmd/fs/write.b b/appl/cmd/fs/write.b
new file mode 100644
index 00000000..934d4d67
--- /dev/null
+++ b/appl/cmd/fs/write.b
@@ -0,0 +1,111 @@
+implement Fsmodule;
+include "sys.m";
+	sys: Sys;
+include "draw.m";
+include "sh.m";
+include "fslib.m";
+	fslib: Fslib;
+	Report, Value, quit, report: import fslib;
+	Fschan, Fsdata, Entrychan, Entry,
+	Gatechan, Gatequery, Option,
+	Next, Down, Skip, Quit: import Fslib;
+
+types(): string
+{
+	return "vsx";
+}
+
+init()
+{
+	sys = load Sys Sys->PATH;
+	fslib = load Fslib Fslib->PATH;
+	if(fslib == nil){
+		sys->fprint(sys->fildes(2), "fs: write: cannot load %s: %r\n", Fslib->PATH);
+		raise "fail:bad module";
+	}
+}
+
+run(nil: ref Draw->Context, report: ref Report,
+			nil: list of Option, args: list of ref Value): ref Value
+{
+	sync := chan of int;
+	spawn  fswriteproc(sync, (hd args).s().i, (hd tl args).x().i, report.start("fswrite"));
+	<-sync;
+	return ref Value.V(sync);
+}
+
+fswriteproc(sync: chan of int, root: string, c: Fschan, errorc: chan of string)
+{
+	sys->pctl(Sys->FORKNS, nil);
+	sync <-= 1;
+	if(<-sync == 0){
+		(<-c).t1 <-= Quit;
+		quit(errorc);
+	}
+		
+	(d, reply) := <-c;
+	if(root != nil){
+		d.dir = ref *d.dir;
+		d.dir.name = root;
+	}
+	fswritedir(d.dir.name, d, reply, c, errorc);
+	quit(errorc);
+}
+
+fswritedir(path: string, d: Fsdata, dreply: chan of int, c: Fschan, errorc: chan of string)
+{
+	fd: ref Sys->FD;
+	if(d.dir.mode & Sys->DMDIR){
+		fd = sys->create(d.dir.name, Sys->OREAD, d.dir.mode|8r300);
+		if(fd == nil && (fd = sys->open(d.dir.name, Sys->OREAD)) == nil){
+			dreply <-= Next;
+			report(errorc, sys->sprint("cannot create %q, mode %uo: %r", path, d.dir.mode|8r300));
+			return;
+		}
+		if(sys->chdir(d.dir.name) == -1){		# XXX beware of names starting with '#'
+			dreply <-= Next;
+			report(errorc, sys->sprint("cannot cd to %q: %r", path));
+			fd = nil;
+			sys->remove(d.dir.name);
+			return;
+		}
+		dreply <-= Down;
+		path[len path] = '/';
+		for(;;){
+			(ent, reply) := <-c;
+			if(ent.dir == nil){
+				reply <-= Next;
+				break;
+			}
+			fswritedir(path + ent.dir.name, ent, reply, c, errorc);
+		}
+		sys->chdir("..");
+		if((d.dir.mode & 8r300) != 8r300){
+			ws := Sys->nulldir;
+			ws.mode = d.dir.mode;
+			if(sys->fwstat(fd, ws) == -1)
+				report(errorc, sys->sprint("cannot wstat %q: %r", path));
+		}
+	}else{
+		fd = sys->create(d.dir.name, Sys->OWRITE, d.dir.mode);
+		if(fd == nil){
+			dreply <-= Next;
+			report(errorc, sys->sprint("cannot create %q, mode %uo: %r", path, d.dir.mode|8r300));
+			return;
+		}
+		dreply <-= Down;
+		while((((nil, buf), reply) := <-c).t0.data != nil){
+			nw := sys->write(fd, buf, len buf);
+			if(nw < len buf){
+				if(nw == -1)
+					errorc <-= sys->sprint("error writing %q: %r", path);
+				else
+					errorc <-= sys->sprint("short write");
+				reply <-= Skip;
+				break;
+			}
+			reply <-= Next;
+		}
+		reply <-= Next;
+	}
+}