/*
 * test expression
 * [ expression ]
 */
#include "defs.h"
#include <sys/types.h>
#include <sys/stat.h>

int	ap, ac;
char	**av;

test(argn, com)
char	*com[];
int	argn;
{
	ac = argn;
	av = com;
	ap = 1;
	if (eq(com[0],"["))
	{
		if (!eq(com[--ac], "]"))
			failed("test", "] missing");
	}
	com[ac] = NIL;
	if (ac <= 1)
		return(1);
	return(exp0() ? 0 : 1);
}

char *
nxtarg(mt)
{
	if (ap >= ac)
	{
		if (mt)
		{
			ap++;
			return(NIL);
		}
		failed("test", "argument expected");
	}
	return(av[ap++]);
}

exp0()
{
	int	p1;
	char	*p2;

	p1 = e1();
	p2 = nxtarg(1);
	if (p2 != NIL)
	{
		if (eq(p2, "-o"))
			return(p1 | exp0());

		if (eq(p2, "]") && !eq(p2, ")"))
			failed("test", synmsg);
	}
	ap--;
	return(p1);
}

e1()
{
	int	p1;
	char	*p2;

	p1 = e2();
	p2 = nxtarg(1);

	if ((p2 != NIL) && eq(p2, "-a"))
		return(p1 & e1());
	ap--;
	return(p1);
}

e2()
{
	if (eq(nxtarg(0), "!"))
		return(!e3());
	ap--;
	return(e3());
}

e3()
{
	int	p1;
	register char	*a;
	char	*p2;
	long	atol();
	long	int1, int2;

	a = nxtarg(0);
	if (eq(a, "("))
	{
		p1 = exp0();
		if (!eq(nxtarg(0), ")"))
			failed("test",") expected");
		return(p1);
	}
	p2 = nxtarg(1);
	ap--;
	if ((p2 == NIL) || (!eq(p2, "=") && !eq(p2, "!=")))
	{
		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, "-d"))
			return(filtyp(nxtarg(0), S_IFDIR));
		if (eq(a, "-c"))
			return(filtyp(nxtarg(0), S_IFCHR));
		if (eq(a, "-b"))
			return(filtyp(nxtarg(0), S_IFBLK));
		if (eq(a, "-f"))
			return(filtyp(nxtarg(0), S_IFREG));
		if (eq(a, "-u"))
			return(ftype(nxtarg(0), S_ISUID));
		if (eq(a, "-g"))
			return(ftype(nxtarg(0), S_ISGID));
		if (eq(a, "-k"))
			return(ftype(nxtarg(0), S_ISVTX));
		if (eq(a, "-p"))
			return(filtyp(nxtarg(0),S_IFIFO));
   		if (eq(a, "-s"))
			return(fsizep(nxtarg(0)));
		if (eq(a, "-t"))
		{
			if (ap >= ac)		/* no args */
				return(isatty(1));
			else if (eq((a = nxtarg(0)), "-a") || eq(a, "-o"))
			{
				ap--;
				return(isatty(1));
			}
			else
				return(isatty(atoi(a)));
		}
		if (eq(a, "-n"))
			return(!eq(nxtarg(0), ""));
		if (eq(a, "-z"))
			return(eq(nxtarg(0), ""));
	}

	p2 = nxtarg(1);
	if (p2 == NIL)
		return(!eq(a, ""));
	if (eq(p2, "-a") || eq(p2, "-o"))
	{
		ap--;
		return(!eq(a, ""));
	}
	if (eq(p2, "="))
		return(eq(nxtarg(0), a));
	if (eq(p2, "!="))
		return(!eq(nxtarg(0), a));
	int1 = atol(a);
	int2 = atol(nxtarg(0));
	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);

	bfailed(btest, badop, p2);
/* NOTREACHED */
}

tio(a, f)
char	*a;
int	f;
{
	if (access(a, f) == 0)
		return(1);
	else
		return(0);
}

ftype(f, field)
char	*f;
int	field;
{
	struct stat statb;

	if (stat(f, &statb) < 0)
		return(0);
	if ((statb.st_mode & field) == field)
		return(1);
	return(0);
}

filtyp(f,field)
char	*f;
int field;
{
	struct stat statb;

	if (stat(f, &statb) < 0)
		return(0);
	if ((statb.st_mode & S_IFMT) == field)
		return(1);
	else
		return(0);
}



fsizep(f)
char	*f;
{
	struct stat statb;

	if (stat(f, &statb) < 0)
		return(0);
	return(statb.st_size > 0L);
}

/*
 * fake diagnostics to continue to look like original
 * test(1) diagnostics
 */
bfailed(s1, s2, s3)
char	*s1;
char	*s2;
char	*s3;
{
	prp();
	prs(s1);
	if (s2)
	{
		prs(colon);
		prs(s2);
		prs(s3);
	}
	newline();
	exitsh(ERROR);
}
