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implement Cd;
include "sys.m";
sys: Sys;
include "draw.m";
Cd: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
stderr: ref Sys->FD;
init(nil: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
argv = tl argv;
if(argv == nil)
argv = "/usr/"+user() :: nil;
if(tl argv != nil) {
sys->fprint(stderr, "Usage: cd [directory]\n");
raise "fail:usage";
}
if(sys->chdir(hd argv) < 0) {
sys->fprint(stderr, "cd: %s: %r\n", hd argv);
raise "fail:failed";
}
}
user(): string
{
fd := sys->open("/dev/user", sys->OREAD);
if(fd == nil)
return "inferno";
buf := array[Sys->NAMEMAX] of byte;
n := sys->read(fd, buf, len buf);
if(n <= 0)
return "inferno";
return string buf[0:n];
}
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