BSD 4.4 Lite bin Sources

6 files changed, 1185 insertions, 0 deletions

diff --git a/bin/test/Makefile b/bin/test/Makefile
new file mode 100644
index 0000000..ccd6089
--- /dev/null
+++ b/bin/test/Makefile
@@ -0,0 +1,8 @@
+#        @(#)Makefile	8.1 (Berkeley) 5/31/93
+
+PROG=	test
+SRCS=   test.c operators.c
+LINKS=	${BINDIR}/test ${BINDIR}/[
+MLINKS=	test.1 '[.1'
+
+.include <bsd.prog.mk>
diff --git a/bin/test/TEST.csh b/bin/test/TEST.csh
new file mode 100644
index 0000000..e5b9652
--- /dev/null
+++ b/bin/test/TEST.csh
@@ -0,0 +1,137 @@
+#	@(#)TEST.csh	5.2 (Berkeley) 4/30/93
+
+#alias t '/usr/src/bin/test/obj/test \!*; echo $status'
+alias t '/bin/test \!*; echo $status'
+
+echo 't -b /dev/ttyp2'
+t -b /dev/ttyp2
+echo 't -b /dev/jb1a'
+t -b /dev/jb1a
+
+echo 't -c test.c'
+t -c test.c
+echo 't -c /dev/tty'
+t -c /dev/tty
+
+echo 't -d test.c'
+t -d test.c
+echo 't -d /etc'
+t -d /etc
+
+echo 't -e noexist'
+t -e noexist
+echo 't -e test.c'
+t -e test.c
+
+echo 't -f noexist'
+t -f noexist
+echo 't -f /dev/tty'
+t -f /dev/tty
+echo 't -f test.c'
+t -f test.c
+
+echo 't -g test.c'
+t -g test.c
+echo 't -g /bin/ps'
+t -g /bin/ps
+
+echo 't -n ""'
+t -n ""
+echo 't -n "hello"'
+t -n "hello"
+
+echo 't -p test.c'
+t -p test.c
+
+echo 't -r noexist'
+t -r noexist
+echo 't -r /etc/master.passwd'
+t -r /etc/master.passwd
+echo 't -r test.c'
+t -r test.c
+
+echo 't -s noexist'
+t -s noexist
+echo 't -s /dev/null'
+t -s /dev/null
+echo 't -s test.c'
+t -s test.c
+
+echo 't -t 20'
+t -t 20
+echo 't -t 0'
+t -t 0
+
+echo 't -u test.c'
+t -u test.c
+echo 't -u /bin/rcp'
+t -u /bin/rcp
+
+echo 't -w noexist'
+t -w noexist
+echo 't -w /etc/master.passwd'
+t -w /etc/master.passwd
+echo 't -w /dev/null'
+t -w /dev/null
+
+echo 't -x noexist'
+t -x noexist
+echo 't -x /bin/ps'
+t -x /bin/ps
+echo 't -x /etc/motd'
+t -x /etc/motd
+
+echo 't -z ""'
+t -z ""
+echo 't -z "foo"'
+t -z "foo"
+
+echo 't "foo"'
+t "foo"
+echo 't ""'
+t ""
+
+echo 't "hello" = "hello"'
+t "hello" = "hello"
+echo 't "hello" = "goodbye"'
+t "hello" = "goodbye"
+
+echo 't "hello" != "hello"'
+t "hello" != "hello"
+echo 't "hello" != "goodbye"'
+t "hello" != "goodbye"
+
+echo 't 200 -eq 200'
+t 200 -eq 200
+echo 't 34 -eq 222'
+t 34 -eq 222
+
+echo 't 200 -ne 200'
+t 200 -ne 200
+echo 't 34 -ne 222'
+t 34 -ne 222
+
+echo 't 200 -gt 200'
+t 200 -gt 200
+echo 't 340 -gt 222'
+t 340 -gt 222
+
+echo 't 200 -ge 200'
+t 200 -ge 200
+echo 't 34 -ge 222'
+t 34 -ge 222
+
+echo 't 200 -lt 200'
+t 200 -lt 200
+echo 't 34 -lt 222'
+t 34 -lt 222
+
+echo 't 200 -le 200'
+t 200 -le 200
+echo 't 340 -le 222'
+t 340 -le 222
+
+echo 't 700 -le 1000 -a -n "1" -a "20" = "20"'
+t 700 -le 1000 -a -n "1" -a "20" = "20"
+echo 't ! \( 700 -le 1000 -a -n "1" -a "20" = "20" \)'
+t ! \( 700 -le 1000 -a -n "1" -a "20" = "20" \)
diff --git a/bin/test/operators.c b/bin/test/operators.c
new file mode 100644
index 0000000..335223b
--- /dev/null
+++ b/bin/test/operators.c
@@ -0,0 +1,148 @@
+/*-
+ * Copyright (c) 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)operators.c	8.3 (Berkeley) 4/2/94";
+#endif /* not lint */
+
+/*
+ * Operators used in the test command.
+ */
+
+#include <stdio.h>
+
+#include "operators.h"
+
+const char *const unary_op[] = {
+      "!",
+      "-b",
+      "-c",
+      "-d",
+      "-e",
+      "-f",
+      "-g",
+      "-h",
+      "-k",
+      "-n",
+      "-p",
+      "-r",
+      "-s",
+      "-t",
+      "-u",
+      "-w",
+      "-x",
+      "-z",
+      NULL
+};
+
+const char *const binary_op[] = {
+      "-o",
+      "|",
+      "-a",
+      "&",
+      "=",
+      "!=",
+      "-eq",
+      "-ne",
+      "-gt",
+      "-lt",
+      "-le",
+      "-ge",
+      NULL
+};
+
+const char op_priority[] = {
+      3,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      12,
+      1,
+      1,
+      2,
+      2,
+      4,
+      4,
+      4,
+      4,
+      4,
+      4,
+      4,
+      4,
+};
+
+const char op_argflag[] = {
+      0,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_STRING,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_INT,
+      OP_FILE,
+      OP_FILE,
+      OP_FILE,
+      OP_STRING,
+      0,
+      0,
+      0,
+      0,
+      OP_STRING,
+      OP_STRING,
+      OP_INT,
+      OP_INT,
+      OP_INT,
+      OP_INT,
+      OP_INT,
+      OP_INT,
+};
diff --git a/bin/test/operators.h b/bin/test/operators.h
new file mode 100644
index 0000000..f8746df
--- /dev/null
+++ b/bin/test/operators.h
@@ -0,0 +1,77 @@
+/*-
+ * Copyright (c) 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)operators.h	8.3 (Berkeley) 4/2/94
+ */
+
+#define	NOT		0
+#define	ISBLOCK		1
+#define	ISCHAR		2
+#define	ISDIR		3
+#define	ISEXIST		4
+#define	ISFILE		5
+#define	ISSETGID	6
+#define	ISSYMLINK	7
+#define	ISSTICKY	8
+#define	STRLEN		9
+#define	ISFIFO		10
+#define	ISREAD		11
+#define	ISSIZE		12
+#define	ISTTY		13
+#define	ISSETUID	14
+#define	ISWRITE		15
+#define	ISEXEC		16
+#define	NULSTR		17
+
+#define	FIRST_BINARY_OP	18
+#define	OR1		18
+#define	OR2		19
+#define	AND1		20
+#define	AND2		21
+#define	STREQ		22
+#define	STRNE		23
+#define	EQ		24
+#define	NE		25
+#define	GT		26
+#define	LT		27
+#define	LE		28
+#define	GE		29
+
+
+#define	OP_INT		1	/* arguments to operator are integer */
+#define	OP_STRING	2	/* arguments to operator are string */
+#define	OP_FILE		3	/* argument is a file name */
+
+extern const char *const unary_op[];
+extern const char *const binary_op[];
+extern const char op_priority[];
+extern const char op_argflag[];
diff --git a/bin/test/test.1 b/bin/test/test.1
new file mode 100644
index 0000000..b4eaf0d
--- /dev/null
+++ b/bin/test/test.1
@@ -0,0 +1,255 @@
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Institute of Electrical and Electronics Engineers, Inc.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)test.1	8.1 (Berkeley) 5/31/93
+.\"
+.Dd May 31, 1993
+.Dt TEST 1
+.Os
+.Sh NAME
+.Nm test
+.Nd condition evaluation utility
+.Sh SYNOPSIS
+.Nm test
+.Ar expression
+.Sh DESCRIPTION
+The
+.Nm test
+utility evaluates the expression and, if it evaluates
+to true, returns a zero (true) exit status; otherwise
+it returns 1 (false).
+If there is no expression, test also
+returns 1 (false).
+.Pp
+All operators and flags are separate arguments to the
+.Nm test
+utility.
+.Pp
+The following primaries are used to construct expression:
+.Bl -tag -width Ar
+.It Fl b Ar file
+True if
+.Ar file
+exists and is a block special
+file.
+.It Fl c Ar file
+True if
+.Ar file
+exists and is a character
+special file.
+.It Fl d Ar file
+True if
+.Ar file
+exists and is a directory.
+.It Fl e Ar file
+True if
+.Ar file
+exists (regardless of type).
+.It Fl f Ar file
+True if
+.Ar file
+exists and is a regular file.
+.It Fl g Ar file
+True if
+.Ar file
+exists and its set group ID flag
+is set.
+.It Fl h Ar file
+True if
+.Ar file
+exists and is a symbolic link.
+.It Fl n Ar string
+True if the length of
+.Ar string
+is nonzero.
+.It Fl p Ar file
+True if
+.Ar file
+is a named pipe
+.Po Tn FIFO Pc .
+.It Fl r Ar file
+True if
+.Ar file exists and is readable.
+.It Fl s Ar file
+True if
+.Ar file
+exists and has a size greater
+than zero.
+.It Fl t Ar [file_descriptor]
+True if the file whose file descriptor number
+is
+.Ar file_descriptor
+(default 1) is open and is
+associated with a terminal.
+.It Fl u Ar file
+True if
+.Ar file
+exists and its set user ID flag
+is set.
+.It Fl w Ar file
+True if
+.Ar file
+exists and is writable.
+True
+indicates only that the write flag is on.
+The file is not writable on a read-only file
+system even if this test indicates true.
+.It Fl x Ar file
+True if
+.Ar file
+exists and is executable.
+True
+indicates only that the execute flag is on.
+If
+.Ar file
+is a directory, true indicates that
+.Ar file
+can be searched.
+.It Fl z Ar string
+True if the length of
+.Ar string
+is zero.
+.It Ar string
+True if
+.Ar string
+is not the null
+string.
+.It Ar \&s\&1 Cm \&= Ar \&s\&2
+True if the strings
+.Ar \&s\&1
+and
+.Ar \&s\&2
+are identical.
+.It Ar \&s\&1 Cm \&!= Ar \&s\&2
+True if the strings
+.Ar \&s\&1
+and
+.Ar \&s\&2
+are not identical.
+.It Ar \&n\&1 Fl \&eq Ar \&n\&2 
+True if the integers
+.Ar \&n\&1
+and
+.Ar \&n\&2
+are algebraically
+equal.
+.It Ar \&n\&1 Fl \&ne Ar \&n\&2
+True if the integers
+.Ar \&n\&1
+and
+.Ar \&n\&2
+are not
+algebraically equal.
+.It Ar \&n\&1 Fl \&gt Ar \&n\&2
+True if the integer
+.Ar \&n\&1
+is algebraically
+greater than the integer
+.Ar \&n\&2 .
+.It Ar \&n\&1 Fl \&ge Ar \&n\&2
+True if the integer
+.Ar \&n\&1
+is algebraically
+greater than or equal to the integer
+.Ar \&n\&2 .
+.It Ar \&n\&1 Fl \&lt Ar \&n\&2
+True if the integer
+.Ar \&n\&1
+is algebraically less
+than the integer
+.Ar \&n\&2 .
+.It Ar \&n\&1 Fl \&le Ar \&n\&2
+True if the integer
+.Ar \&n\&1
+is algebraically less
+than or equal to the integer
+.Ar \&n\&2 .
+.El
+.Pp
+These primaries can be combined with the following operators:
+.Bl -tag -width Ar
+.It Cm \&! Ar expression
+True if
+.Ar expression
+is false.
+.It Ar expression1 Fl a Ar expression2
+True if both
+.Ar expression1
+and
+.Ar expression2
+are true.
+.It Ar expression1 Fl o Ar expression2
+True if either
+.Ar expression1
+or
+.Ar expression2
+are true.
+.It Cm \&( Ns Ar expression Ns Cm \&)
+True if expression is true.
+.El
+.Pp
+The
+.Fl a
+operator has higher precedence than the
+.Fl o
+operator.
+.Sh GRAMMAR AMBIGUITY
+The 
+.Nm test
+grammar is inherently ambiguous.  In order to assure a degree of consistency,
+the cases described in the 
+.St -p1003.2 , 
+section D11.2/4.62.4, standard
+are evaluated consistently according to the rules specified in the
+standards document.  All other cases are subject to the ambiguity in the
+command semantics.
+.Sh RETURN VALUES
+The
+.Nm test
+utility exits with one of the following values:
+.Bl -tag -width Ds
+.It 0
+expression evaluated to true.
+.It 1
+expression evaluated to false or expression was
+missing.
+.It >1
+An error occurred.
+.El
+.Sh STANDARDS
+The
+.Nm test
+function is expected to be
+.St -p1003.2
+compatible.
diff --git a/bin/test/test.c b/bin/test/test.c
new file mode 100644
index 0000000..b9a8ebf
--- /dev/null
+++ b/bin/test/test.c
@@ -0,0 +1,560 @@
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1992, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)test.c	8.3 (Berkeley) 4/2/94";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "operators.h"
+
+#define	STACKSIZE	12
+#define	NESTINCR	16
+
+/* data types */
+#define	STRING	0
+#define	INTEGER	1
+#define	BOOLEAN	2
+
+#define	IS_BANG(s) (s[0] == '!' && s[1] == '\0')
+
+/*
+ * This structure hold a value.  The type keyword specifies the type of
+ * the value, and the union u holds the value.  The value of a boolean
+ * is stored in u.num (1 = TRUE, 0 = FALSE).
+ */
+struct value {
+	int type;
+	union {
+		char *string;
+		long num;
+	} u;
+};
+
+struct operator {
+	short op;		/* Which operator. */
+	short pri;		/* Priority of operator. */
+};
+
+struct filestat {
+	char *name;		/* Name of file. */
+	int rcode;		/* Return code from stat. */
+	struct stat stat;	/* Status info on file. */
+};
+
+static int	expr_is_false __P((struct value *));
+static void	expr_operator __P((int, struct value *, struct filestat *));
+static void	get_int __P((char *, long *));
+static int	lookup_op __P((char *, const char *const *));
+static void	overflow __P((void));
+static int	posix_binary_op __P((char **));
+static int	posix_unary_op __P((char **));
+static void	syntax __P((void));
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	struct operator opstack[STACKSIZE];
+	struct operator *opsp;
+	struct value valstack[STACKSIZE + 1];
+	struct value *valsp;
+	struct filestat fs;
+	char  c, **ap, *opname, *p;
+	int binary, nest, op, pri, ret_val, skipping;
+
+	if ((p = argv[0]) == NULL)
+		errx(2, "test: argc is zero");
+
+	if (*p != '\0' && p[strlen(p) - 1] == '[') {
+		if (strcmp(argv[--argc], "]"))
+			errx(2, "missing ]");
+		argv[argc] = NULL;
+	}
+	ap = argv + 1;
+	fs.name = NULL;
+
+	/*
+	 * Test(1) implements an inherently ambiguous grammer.  In order to
+	 * assure some degree of consistency, we special case the POSIX 1003.2
+	 * requirements to assure correct evaluation for POSIX scripts.  The
+	 * following special cases comply with POSIX P1003.2/D11.2 Section
+	 * 4.62.4.
+	 */
+	switch(argc - 1) {
+	case 0:				/* % test */
+		return (1);
+		break;
+	case 1:				/* % test arg */
+		return (argv[1] == NULL || *argv[1] == '\0') ? 1 : 0;
+		break;
+	case 2:				/* % test op arg */
+		opname = argv[1];
+		if (IS_BANG(opname))
+			return (*argv[2] == '\0') ? 0 : 1;
+		else {
+			ret_val = posix_unary_op(&argv[1]);
+			if (ret_val >= 0)
+				return (ret_val);
+		}
+		break;
+	case 3:				/* % test arg1 op arg2 */
+		if (IS_BANG(argv[1])) {
+			ret_val = posix_unary_op(&argv[1]);
+			if (ret_val >= 0)
+				return (!ret_val);
+		} else {
+			ret_val = posix_binary_op(&argv[1]);
+			if (ret_val >= 0)
+				return (ret_val);
+		}
+		break;
+	case 4:				/* % test ! arg1 op arg2 */
+		if (IS_BANG(argv[1])) {
+			ret_val = posix_binary_op(&argv[2]);
+			if (ret_val >= 0)
+				return (!ret_val);
+		}
+		break;
+	default:
+		break;
+	}
+
+	/*
+	 * We use operator precedence parsing, evaluating the expression as
+	 * we parse it.  Parentheses are handled by bumping up the priority
+	 * of operators using the variable "nest."  We use the variable
+	 * "skipping" to turn off evaluation temporarily for the short
+	 * circuit boolean operators.  (It is important do the short circuit
+	 * evaluation because under NFS a stat operation can take infinitely
+	 * long.)
+	 */
+	opsp = opstack + STACKSIZE;
+	valsp = valstack;
+	nest = skipping = 0;
+	if (*ap == NULL) {
+		valstack[0].type = BOOLEAN;
+		valstack[0].u.num = 0;
+		goto done;
+	}
+	for (;;) {
+		opname = *ap++;
+		if (opname == NULL)
+			syntax();
+		if (opname[0] == '(' && opname[1] == '\0') {
+			nest += NESTINCR;
+			continue;
+		} else if (*ap && (op = lookup_op(opname, unary_op)) >= 0) {
+			if (opsp == &opstack[0])
+				overflow();
+			--opsp;
+			opsp->op = op;
+			opsp->pri = op_priority[op] + nest;
+			continue;
+		} else {
+			valsp->type = STRING;
+			valsp->u.string = opname;
+			valsp++;
+		}
+		for (;;) {
+			opname = *ap++;
+			if (opname == NULL) {
+				if (nest != 0)
+					syntax();
+				pri = 0;
+				break;
+			}
+			if (opname[0] != ')' || opname[1] != '\0') {
+				if ((op = lookup_op(opname, binary_op)) < 0)
+					syntax();
+				op += FIRST_BINARY_OP;
+				pri = op_priority[op] + nest;
+				break;
+			}
+			if ((nest -= NESTINCR) < 0)
+				syntax();
+		}
+		while (opsp < &opstack[STACKSIZE] && opsp->pri >= pri) {
+			binary = opsp->op;
+			for (;;) {
+				valsp--;
+				c = op_argflag[opsp->op];
+				if (c == OP_INT) {
+					if (valsp->type == STRING)
+						get_int(valsp->u.string,
+						    &valsp->u.num);
+					valsp->type = INTEGER;
+				} else if (c >= OP_STRING) {	
+					            /* OP_STRING or OP_FILE */
+					if (valsp->type == INTEGER) {
+						if ((p = malloc(32)) == NULL)
+							err(2, NULL);
+#ifdef SHELL
+						fmtstr(p, 32, "%d", 
+						    valsp->u.num);
+#else
+						(void)sprintf(p,
+						    "%d", valsp->u.num);
+#endif
+						valsp->u.string = p;
+					} else if (valsp->type == BOOLEAN) {
+						if (valsp->u.num)
+							valsp->u.string = 
+						            "true";
+						else
+							valsp->u.string = "";
+					}
+					valsp->type = STRING;
+					if (c == OP_FILE && (fs.name == NULL ||
+					    strcmp(fs.name, valsp->u.string))) {
+						fs.name = valsp->u.string;
+						fs.rcode = 
+						    stat(valsp->u.string, 
+                                                    &fs.stat);
+					}
+				}
+				if (binary < FIRST_BINARY_OP)
+					break;
+				binary = 0;
+			}
+			if (!skipping)
+				expr_operator(opsp->op, valsp, &fs);
+			else if (opsp->op == AND1 || opsp->op == OR1)
+				skipping--;
+			valsp++;		/* push value */
+			opsp++;			/* pop operator */
+		}
+		if (opname == NULL)
+			break;
+		if (opsp == &opstack[0])
+			overflow();
+		if (op == AND1 || op == AND2) {
+			op = AND1;
+			if (skipping || expr_is_false(valsp - 1))
+				skipping++;
+		}
+		if (op == OR1 || op == OR2) {
+			op = OR1;
+			if (skipping || !expr_is_false(valsp - 1))
+				skipping++;
+		}
+		opsp--;
+		opsp->op = op;
+		opsp->pri = pri;
+	}
+done:	return (expr_is_false(&valstack[0]));
+}
+
+static int
+expr_is_false(val)
+	struct value *val;
+{
+
+	if (val->type == STRING) {
+		if (val->u.string[0] == '\0')
+			return (1);
+	} else {		/* INTEGER or BOOLEAN */
+		if (val->u.num == 0)
+			return (1);
+	}
+	return (0);
+}
+
+
+/*
+ * Execute an operator.  Op is the operator.  Sp is the stack pointer;
+ * sp[0] refers to the first operand, sp[1] refers to the second operand
+ * (if any), and the result is placed in sp[0].  The operands are converted
+ * to the type expected by the operator before expr_operator is called.
+ * Fs is a pointer to a structure which holds the value of the last call
+ * to stat, to avoid repeated stat calls on the same file.
+ */
+static void
+expr_operator(op, sp, fs)
+	int op;
+	struct value *sp;
+	struct filestat *fs;
+{
+	int i;
+
+	switch (op) {
+	case NOT:
+		sp->u.num = expr_is_false(sp);
+		sp->type = BOOLEAN;
+		break;
+	case ISEXIST:
+		if (fs == NULL || fs->rcode == -1)
+			goto false;
+		else
+			goto true;
+	case ISREAD:
+		i = S_IROTH;
+		goto permission;
+	case ISWRITE:
+		i = S_IWOTH;
+		goto permission;
+	case ISEXEC:
+		i = S_IXOTH;
+permission:	if (fs->stat.st_uid == geteuid())
+			i <<= 6;
+		else if (fs->stat.st_gid == getegid())
+			i <<= 3;
+		goto filebit;	/* true if (stat.st_mode & i) != 0 */
+	case ISFILE:
+		i = S_IFREG;
+		goto filetype;
+	case ISDIR:
+		i = S_IFDIR;
+		goto filetype;
+	case ISCHAR:
+		i = S_IFCHR;
+		goto filetype;
+	case ISBLOCK:
+		i = S_IFBLK;
+		goto filetype;
+	case ISSYMLINK:
+		i = S_IFLNK;
+		(void)lstat(sp->u.string, &fs->stat);
+		goto filetype;
+	case ISFIFO:
+		i = S_IFIFO;
+		goto filetype;
+filetype:	if ((fs->stat.st_mode & S_IFMT) == i && fs->rcode >= 0)
+true:			sp->u.num = 1;
+		else
+false:			sp->u.num = 0;
+		sp->type = BOOLEAN;
+		break;
+	case ISSETUID:
+		i = S_ISUID;
+		goto filebit;
+	case ISSETGID:
+		i = S_ISGID;
+		goto filebit;
+	case ISSTICKY:
+		i = S_ISVTX;
+filebit:	if (fs->stat.st_mode & i && fs->rcode >= 0)
+			goto true;
+		goto false;
+	case ISSIZE:
+		sp->u.num = fs->rcode >= 0 ? fs->stat.st_size : 0L;
+		sp->type = INTEGER;
+		break;
+	case ISTTY:
+		sp->u.num = isatty(sp->u.num);
+		sp->type = BOOLEAN;
+		break;
+	case NULSTR:
+		if (sp->u.string[0] == '\0')
+			goto true;
+		goto false;
+	case STRLEN:
+		sp->u.num = strlen(sp->u.string);
+		sp->type = INTEGER;
+		break;
+	case OR1:
+	case AND1:
+		/*
+		 * These operators are mostly handled by the parser.  If we
+		 * get here it means that both operands were evaluated, so
+		 * the value is the value of the second operand.
+		 */
+		*sp = *(sp + 1);
+		break;
+	case STREQ:
+	case STRNE:
+		i = 0;
+		if (!strcmp(sp->u.string, (sp + 1)->u.string))
+			i++;
+		if (op == STRNE)
+			i = 1 - i;
+		sp->u.num = i;
+		sp->type = BOOLEAN;
+		break;
+	case EQ:
+		if (sp->u.num == (sp + 1)->u.num)
+			goto true;
+		goto false;
+	case NE:
+		if (sp->u.num != (sp + 1)->u.num)
+			goto true;
+		goto false;
+	case GT:
+		if (sp->u.num > (sp + 1)->u.num)
+			goto true;
+		goto false;
+	case LT:
+		if (sp->u.num < (sp + 1)->u.num)
+			goto true;
+		goto false;
+	case LE:
+		if (sp->u.num <= (sp + 1)->u.num)
+			goto true;
+		goto false;
+	case GE:
+		if (sp->u.num >= (sp + 1)->u.num)
+			goto true;
+		goto false;
+
+	}
+}
+
+static int
+lookup_op(name, table)
+	char *name;
+	const char *const * table;
+{
+	const char *const * tp;
+	const char *p;
+	char c;
+
+	c = name[1];
+	for (tp = table; (p = *tp) != NULL; tp++)
+		if (p[1] == c && !strcmp(p, name))
+			return (tp - table);
+	return (-1);
+}
+
+static int
+posix_unary_op(argv)
+	char **argv;
+{
+	struct filestat fs;
+	struct value valp;
+	int op, c;
+	char *opname;
+
+	opname = *argv;
+	if ((op = lookup_op(opname, unary_op)) < 0)
+		return (-1);
+	c = op_argflag[op];
+	opname = argv[1];
+	valp.u.string = opname;
+	if (c == OP_FILE) {
+		fs.name = opname;
+		fs.rcode = stat(opname, &fs.stat);
+	} else if (c != OP_STRING)
+		return (-1);
+
+	expr_operator(op, &valp, &fs);
+	return (valp.u.num == 0);
+}
+
+static int
+posix_binary_op(argv)
+	char  **argv;
+{
+	struct value v[2];
+	int op, c;
+	char *opname;
+
+	opname = argv[1];
+	if ((op = lookup_op(opname, binary_op)) < 0)
+		return (-1);
+	op += FIRST_BINARY_OP;
+	c = op_argflag[op];
+
+	if (c == OP_INT) {
+		get_int(argv[0], &v[0].u.num);
+		get_int(argv[2], &v[1].u.num);
+	} else {
+		v[0].u.string = argv[0];
+		v[1].u.string = argv[2];
+	}
+	expr_operator(op, v, NULL);
+	return (v[0].u.num == 0);
+}
+
+/*
+ * Integer type checking.
+ */
+static void
+get_int(v, lp)
+	char *v;
+	long *lp;
+{
+	long val;
+	char *ep;
+
+	for (; *v && isspace(*v); ++v);
+	if (isdigit(*v)) {
+		errno = 0;
+		val = strtol(v, &ep, 10);
+		if (*ep != '\0')
+			errx(2, "%s: trailing non-numeric characters", v);
+		if (errno == ERANGE) {
+			if (val == LONG_MIN)
+				errx(2, "%s: underflow", v);
+			if (val == LONG_MAX)
+				errx(2, "%s: overflow", v);
+		}
+		*lp = val;
+		return;
+	}
+	errx(2, "%s: expected integer", v);
+}
+
+static void
+syntax()
+{
+
+	err(2, "syntax error");
+}
+
+static void
+overflow()
+{
+
+	err(2, "expression is too complex");
+}