acid.lib

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

defn saminit()
{
	if !access("/sys/src/cmd/sam/cmd.acid") then
		rc("cd /sys/src/cmd/sam && mk cmd.acid");
	include("/sys/src/cmd/sam/cmd.acid");
}

defn printrunestring(addr, len)
{
	loop 1,len do {
		print(*(addr\r));
		addr = addr+2;
	}
}

defn runestring(addr, len)
{
	local s;
	
	s = "";
	loop 1,len do {
		s = s + *(addr\r);
		addr = addr+2;
	}
	return s;
}

defn string(s)
{
	complex String s;
	return runestring(s.s, s.n);
}

defn filemenu(f)
{
	complex File f;
	local s;
	
	s = "";
	if f != *cmd then {
		if f.mod then
			s = s + "'";
		else 
			s = s + " ";
		if f.rasp != 0 then
			s = s + "+";
		else
			s = s + "-";
		if f == *curfile then
			s = s + ".";
		else
			s = s + " ";
		s = s + " ";
	}
	s = s + string(f.name);
	print("file(", f\X, ") // ", s, "\n");
}

defn files()
{
	local i, f, fx, fp;
	
	fx = (List)file;
	if fx.nused == 0 then
		filemenu(*cmd);
	i = 0;
	loop 1,fx.nused do {
		f = (File)fx.g.filep[i];
		filemenu(f);
		i = i+1;
	}
}

defn range(r)
{
	complex Range r;
	
	if r.p1 == r.p2 then
		return itoa(r.p1, "#%d");
	return itoa(r.p1, "#%d")+"-"+itoa(r.p2, "#%d");
}

defn file(f)
{
	complex File f;
	
	filemenu(f);
	print("\t$=#", f.nc\D, " .=", range(f.dot.r), " buffer(", f\X, ")\n");
	if f == *cmd then {
		print("\tcmdpt=#", *cmdpt\D, " cmdptadv=#", *cmdptadv\D, "\n");
	}
}

defn buffer(b)
{
	complex Buffer b;
	
	print("buffer(", b\X, "): c=", b.c\X, " nc=", b.nc\D, "\n");
	print("cache: ==(");
	print(runestring(b.c, b.nc));
	print(")==\n");
}

print("/sys/lib/acid/sam");