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implement Test;
#
# POSIX standard
# test expression
# [ expression ]
#
# translated Brazil /sys/src/cmd/test.c
#
# print "true" on stdout iff the expression evaluates to true
#
include "sys.m";
sys: Sys;
stderr: ref Sys->FD;
include "draw.m";
Test: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
ap: int;
ac: int;
av: array of string;
init(nil: ref Draw->Context, argl: list of string)
{
if(argl == nil)
return;
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
ac = len argl;
av = array [ac] of string;
for(i := 0; argl != nil; argl = tl argl)
av[i++] = hd argl;
if(av[0] == "[") {
if(av[--ac] != "]")
synbad("] missing");
}
ap = 1;
if(ap<ac && e())
sys->print("true");
# exit;
# sys->raise "fail: false";
}
nxtarg(mt: int): string
{
if(ap >= ac){
if(mt){
ap++;
return nil;
}
synbad("argument expected");
}
return av[ap++];
}
nxtintarg(): (int, int)
{
if(ap<ac && isint(av[ap]))
return (1, int av[ap++]);
return (0, 0);
}
e(): int
{
p1 := e1();
if(nxtarg(1) == "-o")
return p1 || e();
ap--;
return p1;
}
e1(): int
{
p1 := e2();
if(nxtarg(1) == "-a")
return p1 && e1();
ap--;
return p1;
}
e2(): int
{
if(nxtarg(0) == "!")
return !e2();
ap--;
return e3();
}
e3(): int
{
a := nxtarg(0);
if(a == "(") {
p1 := e();
if(nxtarg(0) != ")")
synbad(") expected");
return p1;
}
if(a == "-f")
return filck(nxtarg(0), Topf);
if(a == "-d")
return filck(nxtarg(0), Topd);
if(a == "-r")
return filck(nxtarg(0), Topr);
if(a == "-w")
return filck(nxtarg(0), Topw);
if(a == "-x")
return filck(nxtarg(0), Topx);
if(a == "-e")
return filck(nxtarg(0), Tope);
if(a == "-c")
return 0;
if(a == "-b")
return 0;
if(a == "-u")
return 0;
if(a == "-g")
return 0;
if(a == "-s")
return filck(nxtarg(0), Tops);
if(a == "-t") {
(ok, int1) := nxtintarg();
if(!ok)
return isatty(1);
else
return isatty(int1);
}
if(a == "-n")
return nxtarg(0) != "";
if(a == "-z")
return nxtarg(0) == "";
p2 := nxtarg(1);
if (p2 == nil)
return a != nil;
if(p2 == "=")
return nxtarg(0) == a;
if(p2 == "!=")
return nxtarg(0) != a;
if(!isint(a))
return a != nil;
int1 := int a;
(ok, int2) := nxtintarg();
if(ok){
if(p2 == "-eq")
return int1 == int2;
if(p2 == "-ne")
return int1 != int2;
if(p2 == "-gt")
return int1 > int2;
if(p2 == "-lt")
return int1 < int2;
if(p2 == "-ge")
return int1 >= int2;
if(p2 == "-le")
return int1 <= int2;
}
synbad("unknown operator " + p2);
return 0; # to shut ken up
}
synbad(s: string)
{
sys->fprint(stderr, "test: bad syntax: %s\n", s);
exit;
}
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;
}
Topr,
Topw,
Topx,
Tope,
Topf,
Topd,
Tops: con iota;
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;
}
uid,
gid: string;
permck(dir: Sys->Dir, mask: int): int
{
if(uid == nil) {
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[:n];
}
gid = nil; # how do I find out what my group is?
}
ok: int = 0;
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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