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implement Du;
include "sys.m";
sys: Sys;
sprint: import sys;
include "draw.m";
include "string.m";
strmod: String;
include "readdir.m";
readdir: Readdir;
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
include "arg.m";
aflag := 0; # all files, not just directories
nflag := 0; # names only (but see -t); implies -a
sflag := 0; # summary of top level names
tflag := 0; # use modification time, not size; netlib format if -n also given
uflag := 0; # use last use (access) time, not size
blocksize := big 1024; # quantise length to this block size (still displayed in kb)
bout: ref Iobuf;
Du: module
{
init: fn(nil: ref Draw->Context, arg: list of string);
};
kb(b: big): big
{
return (((b + blocksize - big 1)/blocksize)*blocksize)/big 1024;
}
report(name: string, mtime: int, atime: int, l: big, chksum: int)
{
t := mtime;
if(uflag)
t = atime;
if(nflag){
if(tflag)
bout.puts(sprint("%q %ud %bd %d\n", name, t, l, chksum));
else
bout.puts(sprint("%q\n", name));
}else{
if(tflag)
bout.puts(sprint("%ud %q\n", t, name));
else
bout.puts(sprint("%-4bd %q\n", kb(l), name));
}
}
# Avoid loops in tangled namespaces.
NCACHE: con 1024; # must be power of two
cache := array[NCACHE] of list of ref sys->Dir;
seen(dir: ref sys->Dir): int
{
h := int dir.qid.path & (NCACHE-1);
for(c := cache[h]; c!=nil; c = tl c){
t := hd c;
if(dir.qid.path==t.qid.path && dir.dtype==t.dtype && dir.dev==t.dev)
return 1;
}
cache[h] = dir :: cache[h];
return 0;
}
dir(dirname: string): big
{
prefix := dirname+"/";
if(dirname==".")
prefix = nil;
sum := big 0;
(de, nde) := readdir->init(dirname, readdir->NAME);
if(nde < 0)
warn("can't read", dirname);
for(i := 0; i < nde; i++) {
s := prefix+de[i].name;
if(de[i].mode & Sys->DMDIR){
if(!seen(de[i])){ # arguably should apply to files as well
size := dir(s);
sum += size;
if(!sflag && !nflag)
report(s, de[i].mtime, de[i].atime, size, 0);
}
}else{
l := de[i].length;
sum += l;
if(aflag)
report(s, de[i].mtime, de[i].atime, l, 0);
}
}
return sum;
}
du(name: string)
{
(rc, d) := sys->stat(name);
if(rc < 0){
warn("can't stat", name);
return;
}
if(d.mode & Sys->DMDIR){
d.length = dir(name);
if(nflag && !sflag)
return;
}
report(name, d.mtime, d.atime, d.length, 0);
}
warn(why: string, f: string)
{
sys->fprint(sys->fildes(2), "du: %s %q: %r\n", why, f);
}
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
bufio = load Bufio Bufio->PATH;
strmod = load String String->PATH;
readdir = load Readdir Readdir->PATH;
arg := load Arg Arg->PATH;
if(arg == nil || bufio==nil || arg==nil || readdir==nil || readdir==nil){
sys->fprint(sys->fildes(2), "du: load Error: %r\n");
raise "fail:can't load";
}
sys->pctl(Sys->FORKFD, nil);
bout = bufio->fopen(sys->fildes(1), bufio->OWRITE);
arg->init(args);
arg->setusage("du [-anstu] [-b bsize] [file ...]");
while((o := arg->opt()) != 0)
case o {
'a' =>
aflag = 1;
'b' =>
s := arg->earg();
blocksize = big s;
if(len s > 0 && s[len s-1] == 'k')
blocksize *= big 1024;
if(blocksize <= big 0)
blocksize = big 1;
'n' =>
nflag = 1;
aflag = 1;
's' =>
sflag = 1;
't' =>
tflag = 1;
'u' =>
uflag = 1;
tflag = 1;
* =>
arg->usage();
}
args = arg->argv();
arg = nil;
if(args==nil)
args = "." :: nil;
for(; args!=nil; args = tl args)
du(hd args);
bout.close();
}
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