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/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* test expression
* [ expression ]
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#define EQ(a, b) ((strcmp(a, b) == 0))
static char *nxtarg(int mt);
static int exp(void);
static int e1(void);
static int e2(void);
static int e3(void);
static int tio(char *a, int f);
static int ftype(char *f, int field);
static int filtyp(char *f, int field);
static int fsizep(char *f);
static void synbad(char *s1, char *s2);
static int ap;
static int ac;
static char **av;
int
main(int argc, char *argv[])
{
int status;
ac = argc; av = argv; ap = 1;
if (EQ(argv[0], "[")) {
if (!EQ(argv[--ac], "]"))
synbad("] missing", "");
}
argv[ac] = 0;
if (ac <= 1)
exit(1);
status = (exp() ? 0 : 1);
if (nxtarg(1) != 0)
synbad("too many arguments", "");
return (status);
}
static char *
nxtarg(int mt)
{
if (ap >= ac) {
if (mt) {
ap++;
return (0);
}
synbad("argument expected", "");
}
return (av[ap++]);
}
static int
exp(void)
{
int p1;
char *p2;
p1 = e1();
p2 = nxtarg(1);
if (p2 != 0) {
if (EQ(p2, "-o"))
return (p1 | exp());
if (EQ(p2, "]"))
synbad("syntax error", "");
}
ap--;
return (p1);
}
static int
e1(void)
{
int p1;
char *p2;
p1 = e2();
p2 = nxtarg(1);
if ((p2 != 0) && EQ(p2, "-a"))
return (p1 & e1());
ap--;
return (p1);
}
static int
e2(void)
{
if (EQ(nxtarg(0), "!"))
return (!e3());
ap--;
return (e3());
}
static int
e3(void)
{
int p1;
char *a;
char *p2;
int int1, int2;
a = nxtarg(0);
if (EQ(a, "(")) {
p1 = exp();
if (!EQ(nxtarg(0), ")")) synbad(") expected", "");
return (p1);
}
p2 = nxtarg(1);
ap--;
if ((p2 == 0) || (!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")) {
struct stat statb;
return (stat(nxtarg(0), &statb) >= 0 &&
(statb.st_mode & S_IFMT) != S_IFDIR);
}
if (EQ(a, "-h"))
return (filtyp(nxtarg(0), S_IFLNK));
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"))
#ifdef S_IFIFO
return (filtyp(nxtarg(0), S_IFIFO));
#else
return (nxtarg(0), 0);
#endif
if (EQ(a, "-s"))
return (fsizep(nxtarg(0)));
if (EQ(a, "-t"))
if (ap >= ac)
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 == 0)
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 = atoi(a);
int2 = atoi(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);
synbad("unknown operator ", p2);
/* NOTREACHED */
return (0);
}
static int
tio(char *a, int f)
{
if (access(a, f) == 0)
return (1);
else
return (0);
}
static int
ftype(char *f, int field)
{
struct stat statb;
if (stat(f, &statb) < 0)
return (0);
if ((statb.st_mode & field) == field)
return (1);
return (0);
}
static int
filtyp(char *f, int field)
{
struct stat statb;
if (field == S_IFLNK) {
if (lstat(f, &statb) < 0)
return (0);
} else {
if (stat(f, &statb) < 0)
return (0);
}
if ((statb.st_mode & S_IFMT) == field)
return (1);
else
return (0);
}
static int
fsizep(char *f)
{
struct stat statb;
if (stat(f, &statb) < 0)
return (0);
return (statb.st_size > 0);
}
static void
synbad(char *s1, char *s2)
{
(void) write(2, "test: ", 6);
(void) write(2, s1, strlen(s1));
(void) write(2, s2, strlen(s2));
(void) write(2, "\n", 1);
exit(255);
}
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