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implement Mv;
include "sys.m";
sys: Sys;
stderr: ref Sys->FD;
include "draw.m";
draw: Draw;
include "string.m";
str: String;
Mv: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
init(nil: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
str = load String String->PATH;
if(str == nil) {
sys->fprint(stderr, "mv: can't load %s: %r\n", String->PATH);
raise "fail:load";
}
dirto, dirfrom: Sys->Dir;
todir, toelem: string;
if(len argv<3) {
sys->fprint(stderr, "usage: mv fromfile tofile\n");
sys->fprint(stderr, " mv fromfile ... todir\n");
raise "fail:usage";
}
argv = tl argv;
arr := array[len argv] of string;
for (i:=0; argv!=nil;i++){
arr[i]= hd argv;
argv = tl argv;
}
(i,dirto)=sys->stat(arr[len arr-1]);
if(i >= 0 && (dirto.mode&Sys->DMDIR)){
(i,dirfrom)=sys->stat(arr[0]);
if(len arr == 2 && i >= 0 && (dirfrom.mode&Sys->DMDIR))
(todir,toelem)=split(arr[len arr-1]);
else{
todir = arr[len arr -1];
toelem = ""; # toelem will be fromelem
}
}else
(todir,toelem)=split(arr[len arr-1]);
if(len arr > 2 && toelem != nil) {
sys->fprint(stderr, "mv: %s not a directory\n", arr[len arr-1]);
raise "fail:error";
}
failed := 0;
for(i=0; i < len arr-1; i++)
if (mv(arr[i], todir, toelem) < 0)
failed++;
if(failed)
raise "fail:error";
}
mv(from,todir,toelem : string): int
{
(i,dirb):=sys->stat(from);
if(i != 0) {
sys->fprint(stderr, "mv: can't stat %s: %r\n", from);
return -1;
}
(fromdir,fromelem):=split(from);
fromname:= fromdir+fromelem;
if(toelem == nil){
if (todir[len todir-1]!='/')
todir[len todir]='/';
toelem = fromelem;
}
i = len toelem;
if(i==0){
sys->fprint(stderr, "mv: null last name element moving %s\n", fromname);
return -1;
}
toname:=todir+toelem;
if(samefile(fromdir, todir)){
if(samefile(fromname, toname)){
sys->fprint(stderr, "mv: %s and %s are the same\n", fromname, toname);
return -1;
}
(j,dirt):=sys->stat(toname);
if( (j == 0) && (dirb.mode&Sys->DMDIR) ){
sys->fprint(stderr, "mv: can't rename a directory to an existing name\n");
return -1;
}
if(j == 0)
hardremove(toname);
dirt = sys->nulldir;
dirt.name=toelem;
if(sys->wstat(fromname,dirt) >= 0)
return 0;
if(dirb.mode&Sys->DMDIR){
sys->fprint(stderr, "mv: can't rename directory %s: %r\n", fromname);
return -1;
}
}
# Renaming won't work --- have to copy
if(dirb.mode&Sys->DMDIR){
sys->fprint(stderr, "mv: %s is a directory, not copied to %s\n", fromname, toname);
return -1;
}
fdf := sys->open(fromname, Sys->OREAD);
if(fdf==nil){
sys->fprint(stderr, "mv: can't open %s: %r\n", fromname);
return -1;
}
fdt := sys->create(toname, Sys->OWRITE, dirb.mode);
if(fdt == nil){
sys->fprint(stderr, "mv: can't create %s: %r\n", toname);
return -1;
}
if ((stat := copy1(fdf, fdt, fromname, toname)) != -1)
fdf = nil; # temp bug: sometimes can't remove open file
if (sys->remove(fromname) < 0) {
sys->fprint(stderr, "mv: can't remove %s: %r\n", fromname);
return -1;
}
return stat;
}
copy1(fdf, fdt : ref Sys->FD,from, fto : string): int
{
n : int;
buf:=array[Sys->ATOMICIO] of byte;
for(;;) {
n = sys->read(fdf, buf, len buf);
if (n<=0)
break;
n1 := sys->write(fdt, buf, n);
if(n1 != n) {
sys->fprint(stderr, "mv: error writing %s: %r\n", fto);
return -1;
}
}
if(n < 0) {
sys->fprint(stderr, "mv: error reading %s: %r\n", from);
return -1;
}
return 0;
}
split(name : string): (string,string)
{
(d,t) := str->splitr(name, "/");
if(d!=nil)
return(d,t);
else if(name=="..")
return("../",".");
else
return("./",name);
}
samefile(a,b : string): int
{
if(a==b)
return 1;
(i,da):=sys->stat(a);
(j,db):=sys->stat(b);
if(i < 0 || j < 0)
return 0;
i= (da.qid.path==db.qid.path && da.qid.vers==db.qid.vers &&
da.dev==db.dev && da.dtype==db.dtype);
return i;
}
hardremove(a: string)
{
if(sys->remove(a) == -1){
sys->fprint(stderr, "mv: can't remove %s: %r\n", a);
raise "fail:mv";
}
do; while(sys->remove(a) != -1);
}
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