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implement Ftest;
#
# test file permissions or attributes
#
include "sys.m";
sys: Sys;
include "draw.m";
stderr: ref Sys->FD;
Ftest: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
Topr, Topw, Topx, Tope, Topf, Topd, Tops: con iota;
init(nil: ref Draw->Context, argl: list of string)
{
if(argl == nil)
return;
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
if (tl argl == nil)
usage();
a := hd tl argl;
argl = tl tl argl;
ok := 0;
case a {
"-f" =>
ok = filck(nxtarg(argl), Topf);
"-d" =>
ok = filck(nxtarg(argl), Topd);
"-r" =>
ok = filck(nxtarg(argl), Topr);
"-w" =>
ok = filck(nxtarg(argl), Topw);
"-x" =>
ok = filck(nxtarg(argl), Topx);
"-e" =>
ok = filck(nxtarg(argl), Tope);
"-s" =>
ok = filck(nxtarg(argl), Tops);
"-t" =>
fd := 1;
if (argl != nil) {
if (!isint(hd argl)) {
sys->fprint(stderr, "ftest: bad argument to -t\n");
usage();
}
fd = int hd argl;
}
ok = isatty(fd);
* =>
sys->fprint(stderr, "test: unknown option %s\n", a);
usage();
}
if (!ok)
raise "fail:false";
}
nxtarg(argl: list of string): string
{
if(argl == nil) {
sys->fprint(stderr, "test: argument expected\n");
usage();
}
return hd argl;
}
usage()
{
sys->fprint(stderr, "usage: (ftest -fdrwxes file)|(ftest -t fdno)\n");
raise "fail:usage";
}
isint(s: string): int
{
if(s == nil)
return 0;
for(i := 0; i < len s; i++)
if(s[i] < '0' || s[i] > '9')
return 0;
return 1;
}
filck(fname: string, Top: int): int
{
(ok, dir) := sys->stat(fname);
if(ok >= 0) {
ok = 0;
case Top {
Topr => # readable
ok = permck(dir, 8r004);
Topw => # writable
ok = permck(dir, 8r002);
Topx => # executable
ok = permck(dir, 8r001);
Tope => # exists
ok = 1;
Topf => # is a regular file
ok = (dir.mode & Sys->DMDIR) == 0;
Topd => # is a directory
ok = (dir.mode & Sys->DMDIR) != 0;
Tops => # has length > 0
ok = dir.length > big 0;
}
}
return ok > 0;
}
permck(dir: Sys->Dir, mask: int): int
{
uid, gid: string;
fd := sys->open("/dev/user", Sys->OREAD);
if(fd != nil) {
buf := array [28] of byte;
n := sys->read(fd, buf, len buf);
if(n > 0)
uid = string buf[0:n];
}
# how do I find out what my group is?
ok := dir.mode & mask<<0;
if(!ok && dir.gid == gid)
ok = dir.mode & mask<<3;
if(!ok && dir.uid == uid)
ok = dir.mode & mask<<6;
return ok > 0;
}
isatty(fd: int): int
{
d1, d2: Sys->Dir;
ok: int;
(ok, d1) = sys->fstat(sys->fildes(fd));
if(ok < 0)
return 0;
(ok, d2) = sys->stat("/dev/cons");
if(ok < 0)
return 0;
return d1.dtype==d2.dtype && d1.dev==d2.dev && d1.qid.path==d2.qid.path;
}
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