/* * 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 isatty plan9_isatty #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); voidmain(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++]);} intnxtintarg(int *pans){	if(ap<ac && isint(av[ap], pans)){		ap++;		return 1;	}	return 0;} inte(void){	int p1; 	p1 = e1();	if (EQ(nxtarg(1), "-o"))		return(p1 || e());	ap--;	return(p1);} inte1(void){	int p1; 	p1 = e2();	if (EQ(nxtarg(1), "-a"))		return (p1 && e1());	ap--;	return(p1);} inte2(void){	if (EQ(nxtarg(0), "!"))		return(!e2());	ap--;	return(e3());} inte3(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 */} inttio(char *a, int f){	return access (a, f) >= 0;} /* copy to local memory; clear names for safety */intlocalstat(char *f, Dir *dir){	Dir *d; 	d = dirstat(f);	if(d == nil)		return(-1);	*dir = *d;	free(d);	dir->name = 0;	dir->uid = 0;	dir->gid = 0;	dir->muid = 0;	return 0;} /* copy to local memory; clear names for safety */intlocalfstat(int f, Dir *dir){	Dir *d; 	d = dirfstat(f);	if(d == nil)		return(-1);	*dir = *d;	free(d);	dir->name = 0;	dir->uid = 0;	dir->gid = 0;	dir->muid = 0;	return 0;} inthasmode(char *f, ulong m){	Dir dir; 	if(localstat(f,&dir)<0)		return(0);	return(dir.mode&m);} intisdir(char *f){	Dir dir; 	if(localstat(f,&dir)<0)		return(0);	return(dir.mode&DMDIR);} intisreg(char *f){	Dir dir; 	if(localstat(f,&dir)<0)		return(0);	return(!(dir.mode&DMDIR));} intisatty(int fd){	Dir d1, d2; 	if(localfstat(fd, &d1) < 0)		return 0;	if(localstat("/dev/cons", &d2) < 0)		return 0;	return d1.type==d2.type && d1.dev==d2.dev && d1.qid.path==d2.qid.path;} intfsizep(char *f){	Dir dir; 	if(localstat(f,&dir)<0)		return(0);	return(dir.length>0);} voidsynbad(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");} intisint(char *s, int *pans){	char *ep; 	*pans = strtol(s, &ep, 0);	return (*ep == 0);} intisolder(char *pin, char *f){	char *p = pin;	ulong n, m;	Dir dir; 	if(localstat(f,&dir)<0)		return(0); 	/* parse time */	n = 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++;			break;		default:			synbad("bad time syntax, ", pin);		}	} 	return(dir.mtime+n < time(0));} intisolderthan(char *a, char *b){	Dir ad, bd; 	if(localstat(a, &ad)<0)		return(0);	if(localstat(b, &bd)<0)		return(0);	return ad.mtime > bd.mtime;} intisnewerthan(char *a, char *b){	Dir ad, bd; 	if(localstat(a, &ad)<0)		return(0);	if(localstat(b, &bd)<0)		return(0);	return ad.mtime < bd.mtime;}