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implement Fsmodule;
include "sys.m";
sys: Sys;
include "draw.m";
include "sh.m";
include "fslib.m";
fslib: Fslib;
Report, Value, type2s, quit: import fslib;
Fschan, Fsdata, Entrychan, Entry,
Gatechan, Gatequery, Nilentry, Option,
Next, Down, Skip, Quit: import Fslib;
# XXX implement octal modes.
User: con 8r700;
Group: con 8r070;
Other: con 8r007;
All: con User | Group | Other;
Read: con 8r444;
Write: con 8r222;
Exec: con 8r111;
types(): string
{
return "ps";
}
badmod(p: string)
{
sys->fprint(sys->fildes(2), "fs: size: cannot load %s: %r\n", p);
raise "fail:bad module";
}
init()
{
sys = load Sys Sys->PATH;
fslib = load Fslib Fslib->PATH;
if(fslib == nil)
badmod(Fslib->PATH);
}
run(nil: ref Draw->Context, nil: ref Report,
nil: list of Option, args: list of ref Value): ref Value
{
spec := (hd args).s().i;
(ok, mask, mode) := parsemode(spec);
if(ok == 0){
sys->fprint(sys->fildes(2), "fs: mode: bad mode %#q\n", spec);
return nil;
}
c := chan of Gatequery;
spawn modegate(c, mask, mode);
return ref Value.P(c);
}
modegate(c: Gatechan, mask, mode: int)
{
m := mode & mask;
while((((d, nil, nil), reply) := <-c).t0.t0 != nil)
reply <-= ((d.mode & mask) ^ m) == 0;
}
# stolen from /appl/cmd/chmod.b
parsemode(spec: string): (int, int, int)
{
mask := Sys->DMAPPEND | Sys->DMEXCL | Sys->DMDIR | Sys->DMAUTH;
loop:
for(i := 0; i < len spec; i++){
case spec[i] {
'u' =>
mask |= User;
'g' =>
mask |= Group;
'o' =>
mask |= Other;
'a' =>
mask |= All;
* =>
break loop;
}
}
if(i == len spec)
return (0, 0, 0);
if(i == 0)
mask |= All;
op := spec[i++];
if(op != '+' && op != '-' && op != '=')
return (0, 0, 0);
mode := 0;
for(; i < len spec; i++){
case spec[i]{
'r' =>
mode |= Read;
'w' =>
mode |= Write;
'x' =>
mode |= Exec;
'a' =>
mode |= Sys->DMAPPEND;
'l' =>
mode |= Sys->DMEXCL;
'd' =>
mode |= Sys->DMDIR;
'A' =>
mode |= Sys->DMAUTH;
* =>
return (0, 0, 0);
}
}
if(op == '+' || op == '-')
mask &= mode;
if(op == '-')
mode = ~mode;
return (1, mask, mode);
}
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