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/*
* POSIX standard
* test expression
* [ expression ]
*
* Plan 9 additions:
* -A file exists and is append-only
* -L file exists and is exclusive-use
* -T file exists and is temporary
*/
#include <u.h>
#include <libc.h>
#define EQ(a,b) ((tmp=a)==0?0:(strcmp(tmp,b)==0))
int ap;
int ac;
char **av;
char *tmp;
void synbad(char *, char *);
int fsizep(char *);
int isdir(char *);
int isreg(char *);
int isatty(int);
int isint(char *, int *);
int isolder(char *, char *);
int isolderthan(char *, char *);
int isnewerthan(char *, char *);
int hasmode(char *, ulong);
int tio(char *, int);
int e(void), e1(void), e2(void), e3(void);
char *nxtarg(int);
void
main(int argc, char *argv[])
{
int r;
char *c;
ac = argc; av = argv; ap = 1;
if(EQ(argv[0],"[")) {
if(!EQ(argv[--ac],"]"))
synbad("] missing","");
}
argv[ac] = 0;
if (ac<=1)
exits("usage");
r = e();
/*
* nice idea but short-circuit -o and -a operators may have
* not consumed their right-hand sides.
*/
if(0 && (c = nxtarg(1)) != nil)
synbad("unexpected operator/operand: ", c);
exits(r?0:"false");
}
char *
nxtarg(int mt)
{
if(ap>=ac){
if(mt){
ap++;
return(0);
}
synbad("argument expected","");
}
return(av[ap++]);
}
int
nxtintarg(int *pans)
{
if(ap<ac && isint(av[ap], pans)){
ap++;
return 1;
}
return 0;
}
int
e(void)
{
int p1;
p1 = e1();
if (EQ(nxtarg(1), "-o"))
return(p1 || e());
ap--;
return(p1);
}
int
e1(void)
{
int p1;
p1 = e2();
if (EQ(nxtarg(1), "-a"))
return (p1 && e1());
ap--;
return(p1);
}
int
e2(void)
{
if (EQ(nxtarg(0), "!"))
return(!e2());
ap--;
return(e3());
}
int
e3(void)
{
int p1, int1, int2;
char *a, *p2;
a = nxtarg(0);
if(EQ(a, "(")) {
p1 = e();
if(!EQ(nxtarg(0), ")"))
synbad(") expected","");
return(p1);
}
if(EQ(a, "-A"))
return(hasmode(nxtarg(0), DMAPPEND));
if(EQ(a, "-L"))
return(hasmode(nxtarg(0), DMEXCL));
if(EQ(a, "-T"))
return(hasmode(nxtarg(0), DMTMP));
if(EQ(a, "-f"))
return(isreg(nxtarg(0)));
if(EQ(a, "-d"))
return(isdir(nxtarg(0)));
if(EQ(a, "-r"))
return(tio(nxtarg(0), 4));
if(EQ(a, "-w"))
return(tio(nxtarg(0), 2));
if(EQ(a, "-x"))
return(tio(nxtarg(0), 1));
if(EQ(a, "-e"))
return(tio(nxtarg(0), 0));
if(EQ(a, "-c"))
return(0);
if(EQ(a, "-b"))
return(0);
if(EQ(a, "-u"))
return(0);
if(EQ(a, "-g"))
return(0);
if(EQ(a, "-s"))
return(fsizep(nxtarg(0)));
if(EQ(a, "-t"))
if(ap>=ac)
return(isatty(1));
else if(nxtintarg(&int1))
return(isatty(int1));
else
synbad("not a valid file descriptor number ", "");
if(EQ(a, "-n"))
return(!EQ(nxtarg(0), ""));
if(EQ(a, "-z"))
return(EQ(nxtarg(0), ""));
p2 = nxtarg(1);
if (p2==0)
return(!EQ(a,""));
if(EQ(p2, "="))
return(EQ(nxtarg(0), a));
if(EQ(p2, "!="))
return(!EQ(nxtarg(0), a));
if(EQ(p2, "-older"))
return(isolder(nxtarg(0), a));
if(EQ(p2, "-ot"))
return(isolderthan(nxtarg(0), a));
if(EQ(p2, "-nt"))
return(isnewerthan(nxtarg(0), a));
if(!isint(a, &int1))
synbad("unexpected operator/operand: ", p2);
if(nxtintarg(&int2)){
if(EQ(p2, "-eq"))
return(int1==int2);
if(EQ(p2, "-ne"))
return(int1!=int2);
if(EQ(p2, "-gt"))
return(int1>int2);
if(EQ(p2, "-lt"))
return(int1<int2);
if(EQ(p2, "-ge"))
return(int1>=int2);
if(EQ(p2, "-le"))
return(int1<=int2);
}
synbad("unknown operator ",p2);
return 0; /* to shut ken up */
}
int
tio(char *a, int f)
{
return access (a, f) >= 0;
}
/*
* note that the name strings pointed to by Dir members are
* allocated with the Dir itself (by the same call to malloc),
* but are not included in sizeof(Dir), so copying a Dir won't
* copy the strings it points to.
*/
int
hasmode(char *f, ulong m)
{
int r;
Dir *dir;
dir = dirstat(f);
if (dir == nil)
return 0;
r = (dir->mode & m) != 0;
free(dir);
return r;
}
int
isdir(char *f)
{
return hasmode(f, DMDIR);
}
int
isreg(char *f)
{
int r;
Dir *dir;
dir = dirstat(f);
if (dir == nil)
return 0;
r = (dir->mode & DMDIR) == 0;
free(dir);
return r;
}
int
isatty(int fd)
{
int r;
Dir *d1, *d2;
d1 = dirfstat(fd);
d2 = dirstat("/dev/cons");
if (d1 == nil || d2 == nil)
r = 0;
else
r = d1->type == d2->type && d1->dev == d2->dev &&
d1->qid.path == d2->qid.path;
free(d1);
free(d2);
return r;
}
int
fsizep(char *f)
{
int r;
Dir *dir;
dir = dirstat(f);
if (dir == nil)
return 0;
r = dir->length > 0;
free(dir);
return r;
}
void
synbad(char *s1, char *s2)
{
int len;
write(2, "test: ", 6);
if ((len = strlen(s1)) != 0)
write(2, s1, len);
if ((len = strlen(s2)) != 0)
write(2, s2, len);
write(2, "\n", 1);
exits("bad syntax");
}
int
isint(char *s, int *pans)
{
char *ep;
*pans = strtol(s, &ep, 0);
return (*ep == 0);
}
int
isolder(char *pin, char *f)
{
int r, rel;
ulong n, m;
char *p = pin;
Dir *dir;
dir = dirstat(f);
if (dir == nil)
return 0;
/* parse time */
n = 0;
rel = 0;
while(*p){
m = strtoul(p, &p, 0);
switch(*p){
case 0:
n = m;
break;
case 'y':
m *= 12;
/* fall through */
case 'M':
m *= 30;
/* fall through */
case 'd':
m *= 24;
/* fall through */
case 'h':
m *= 60;
/* fall through */
case 'm':
m *= 60;
/* fall through */
case 's':
n += m;
p++;
rel = 1;
break;
default:
synbad("bad time syntax, ", pin);
}
}
if (!rel)
m = n;
else{
m = time(0);
if (n > m) /* before epoch? */
m = 0;
else
m -= n;
}
r = dir->mtime < m;
free(dir);
return r;
}
int
isolderthan(char *a, char *b)
{
int r;
Dir *ad, *bd;
ad = dirstat(a);
bd = dirstat(b);
if (ad == nil || bd == nil)
r = 0;
else
r = ad->mtime > bd->mtime;
free(ad);
free(bd);
return r;
}
int
isnewerthan(char *a, char *b)
{
int r;
Dir *ad, *bd;
ad = dirstat(a);
bd = dirstat(b);
if (ad == nil || bd == nil)
r = 0;
else
r = ad->mtime < bd->mtime;
free(ad);
free(bd);
return r;
}