576 lines
13 KiB
C
576 lines
13 KiB
C
/*-
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* Copyright (c) 1992 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1992 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "@(#)test.c 5.4 (Berkeley) 2/12/93";*/
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static char *rcsid = "$Id: test.c,v 1.8 1993/09/23 22:49:40 mycroft Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "operators.h"
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#define STACKSIZE 12
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#define NESTINCR 16
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/* data types */
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#define STRING 0
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#define INTEGER 1
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#define BOOLEAN 2
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#define IS_BANG(s) (s[0] == '!' && s[1] == '\0')
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/*
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* This structure hold a value. The type keyword specifies the type of
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* the value, and the union u holds the value. The value of a boolean
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* is stored in u.num (1 = TRUE, 0 = FALSE).
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*/
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struct value {
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int type;
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union {
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char *string;
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long num;
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} u;
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};
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struct operator {
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short op; /* Which operator. */
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short pri; /* Priority of operator. */
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};
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struct filestat {
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char *name; /* Name of file. */
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int rcode; /* Return code from stat. */
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struct stat stat; /* Status info on file. */
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};
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static void err __P((const char *, ...));
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static int expr_is_false __P((struct value *));
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static void expr_operator __P((int, struct value *, struct filestat *));
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static long chk_atol __P((char *));
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static int lookup_op __P((char *, char *const *));
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static void overflow __P((void));
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static int posix_binary_op __P((char **));
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static int posix_unary_op __P((char **));
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static void syntax __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct operator opstack[STACKSIZE];
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struct operator *opsp;
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struct value valstack[STACKSIZE + 1];
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struct value *valsp;
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struct filestat fs;
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char c, **ap, *opname, *p;
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int binary, nest, op, pri, ret_val, skipping;
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if ((p = argv[0]) == NULL) {
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err("test: argc is zero.\n");
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exit(2);
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}
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if (*p != '\0' && p[strlen(p) - 1] == '[') {
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if (strcmp(argv[--argc], "]"))
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err("missing ]");
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argv[argc] = NULL;
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}
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ap = argv + 1;
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fs.name = NULL;
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/*
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* Test(1) implements an inherently ambiguous grammer. In order to
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* assure some degree of consistency, we special case the POSIX 1003.2
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* requirements to assure correct evaluation for POSIX scripts. The
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* following special cases comply with POSIX P1003.2/D11.2 Section
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* 4.62.4.
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*/
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switch(argc - 1) {
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case 0: /* % test */
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return (1);
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break;
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case 1: /* % test arg */
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/* MIPS machine returns NULL of '[ ]' is called. */
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return (argv[1] == 0 || *argv[1] == '\0') ? 1 : 0;
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break;
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case 2: /* % test op arg */
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opname = argv[1];
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if (IS_BANG(opname))
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return (*argv[2] == '\0') ? 0 : 1;
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else {
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ret_val = posix_unary_op(&argv[1]);
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if (ret_val >= 0)
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return (ret_val);
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}
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break;
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case 3: /* % test arg1 op arg2 */
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if (IS_BANG(argv[1])) {
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ret_val = posix_unary_op(&argv[1]);
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if (ret_val >= 0)
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return (!ret_val);
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} else {
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ret_val = posix_binary_op(&argv[1]);
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if (ret_val >= 0)
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return (ret_val);
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}
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break;
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case 4: /* % test ! arg1 op arg2 */
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if (IS_BANG(argv[1]) && lookup_op(argv[3], andor_op) < 0) {
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ret_val = posix_binary_op(&argv[2]);
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if (ret_val >= 0)
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return (!ret_val);
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}
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break;
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default:
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break;
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}
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/*
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* We use operator precedence parsing, evaluating the expression as
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* we parse it. Parentheses are handled by bumping up the priority
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* of operators using the variable "nest." We use the variable
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* "skipping" to turn off evaluation temporarily for the short
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* circuit boolean operators. (It is important do the short circuit
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* evaluation because under NFS a stat operation can take infinitely
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* long.)
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*/
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opsp = opstack + STACKSIZE;
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valsp = valstack;
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nest = skipping = 0;
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if (*ap == NULL) {
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valstack[0].type = BOOLEAN;
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valstack[0].u.num = 0;
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goto done;
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}
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for (;;) {
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opname = *ap++;
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if (opname == NULL)
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syntax();
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if (opname[0] == '(' && opname[1] == '\0') {
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nest += NESTINCR;
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continue;
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} else if (*ap && (op = lookup_op(opname, unary_op)) >= 0) {
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if (opsp == &opstack[0])
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overflow();
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--opsp;
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opsp->op = op;
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opsp->pri = op_priority[op] + nest;
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continue;
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} else {
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valsp->type = STRING;
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valsp->u.string = opname;
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valsp++;
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}
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for (;;) {
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opname = *ap++;
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if (opname == NULL) {
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if (nest != 0)
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syntax();
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pri = 0;
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break;
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}
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if (opname[0] != ')' || opname[1] != '\0') {
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if ((op = lookup_op(opname, binary_op)) < 0)
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syntax();
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op += FIRST_BINARY_OP;
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pri = op_priority[op] + nest;
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break;
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}
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if ((nest -= NESTINCR) < 0)
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syntax();
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}
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while (opsp < &opstack[STACKSIZE] && opsp->pri >= pri) {
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binary = opsp->op;
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for (;;) {
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valsp--;
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c = op_argflag[opsp->op];
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if (c == OP_INT) {
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if (valsp->type == STRING)
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valsp->u.num =
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chk_atol(valsp->u.string);
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valsp->type = INTEGER;
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} else if (c >= OP_STRING) {
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/* OP_STRING or OP_FILE */
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if (valsp->type == INTEGER) {
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if ((p = malloc(32)) == NULL)
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err("%s",
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strerror(errno));
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#ifdef SHELL
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fmtstr(p, 32, "%d",
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valsp->u.num);
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#else
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(void)sprintf(p,
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"%d", valsp->u.num);
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#endif
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valsp->u.string = p;
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} else if (valsp->type == BOOLEAN) {
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if (valsp->u.num)
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valsp->u.string =
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"true";
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else
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valsp->u.string = "";
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}
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valsp->type = STRING;
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if (c == OP_FILE && (fs.name == NULL ||
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strcmp(fs.name, valsp->u.string))) {
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fs.name = valsp->u.string;
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fs.rcode =
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stat(valsp->u.string,
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&fs.stat);
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}
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}
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if (binary < FIRST_BINARY_OP)
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break;
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binary = 0;
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}
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if (!skipping)
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expr_operator(opsp->op, valsp, &fs);
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else if (opsp->op == AND1 || opsp->op == OR1)
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skipping--;
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valsp++; /* push value */
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opsp++; /* pop operator */
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}
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if (opname == NULL)
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break;
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if (opsp == &opstack[0])
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overflow();
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if (op == AND1 || op == AND2) {
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op = AND1;
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if (skipping || expr_is_false(valsp - 1))
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skipping++;
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}
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if (op == OR1 || op == OR2) {
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op = OR1;
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if (skipping || !expr_is_false(valsp - 1))
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skipping++;
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}
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opsp--;
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opsp->op = op;
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opsp->pri = pri;
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}
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done: return (expr_is_false(&valstack[0]));
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}
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static int
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expr_is_false(val)
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struct value *val;
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{
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if (val->type == STRING) {
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if (val->u.string[0] == '\0')
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return (1);
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} else { /* INTEGER or BOOLEAN */
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if (val->u.num == 0)
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return (1);
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}
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return (0);
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}
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/*
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* Execute an operator. Op is the operator. Sp is the stack pointer;
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* sp[0] refers to the first operand, sp[1] refers to the second operand
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* (if any), and the result is placed in sp[0]. The operands are converted
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* to the type expected by the operator before expr_operator is called.
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* Fs is a pointer to a structure which holds the value of the last call
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* to stat, to avoid repeated stat calls on the same file.
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*/
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static void
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expr_operator(op, sp, fs)
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int op;
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struct value *sp;
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struct filestat *fs;
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{
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int i;
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switch (op) {
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case NOT:
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sp->u.num = expr_is_false(sp);
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sp->type = BOOLEAN;
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break;
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case ISEXIST:
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if (fs == NULL || fs->rcode == -1)
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goto false;
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else
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goto true;
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case ISREAD:
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i = S_IROTH;
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goto permission;
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case ISWRITE:
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i = S_IWOTH;
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goto permission;
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case ISEXEC:
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i = S_IXOTH;
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permission: if (fs->stat.st_uid == geteuid())
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i <<= 6;
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else if (fs->stat.st_gid == getegid())
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i <<= 3;
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goto filebit; /* true if (stat.st_mode & i) != 0 */
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case ISFILE:
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i = S_IFREG;
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goto filetype;
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case ISDIR:
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i = S_IFDIR;
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goto filetype;
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case ISCHAR:
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i = S_IFCHR;
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goto filetype;
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case ISBLOCK:
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i = S_IFBLK;
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goto filetype;
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case ISFIFO:
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i = S_IFIFO;
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goto filetype;
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filetype: if ((fs->stat.st_mode & S_IFMT) == i && fs->rcode >= 0)
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true: sp->u.num = 1;
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else
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false: sp->u.num = 0;
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sp->type = BOOLEAN;
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break;
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case ISSETUID:
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i = S_ISUID;
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goto filebit;
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case ISSETGID:
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i = S_ISGID;
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goto filebit;
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case ISSTICKY:
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i = S_ISVTX;
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filebit: if (fs->stat.st_mode & i && fs->rcode >= 0)
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goto true;
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goto false;
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case ISSIZE:
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sp->u.num = fs->rcode >= 0 ? fs->stat.st_size : 0L;
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sp->type = INTEGER;
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break;
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case ISTTY:
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sp->u.num = isatty(sp->u.num);
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sp->type = BOOLEAN;
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break;
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case NULSTR:
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if (sp->u.string[0] == '\0')
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goto true;
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goto false;
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case STRLEN:
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sp->u.num = strlen(sp->u.string);
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sp->type = INTEGER;
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break;
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case OR1:
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case AND1:
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/*
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* These operators are mostly handled by the parser. If we
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* get here it means that both operands were evaluated, so
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* the value is the value of the second operand.
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*/
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*sp = *(sp + 1);
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break;
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case STREQ:
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case STRNE:
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i = 0;
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if (!strcmp(sp->u.string, (sp + 1)->u.string))
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i++;
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if (op == STRNE)
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i = 1 - i;
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sp->u.num = i;
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sp->type = BOOLEAN;
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break;
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case EQ:
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if (sp->u.num == (sp + 1)->u.num)
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goto true;
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goto false;
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case NE:
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if (sp->u.num != (sp + 1)->u.num)
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goto true;
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goto false;
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case GT:
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if (sp->u.num > (sp + 1)->u.num)
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goto true;
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goto false;
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case LT:
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if (sp->u.num < (sp + 1)->u.num)
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goto true;
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goto false;
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case LE:
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if (sp->u.num <= (sp + 1)->u.num)
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goto true;
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goto false;
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case GE:
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if (sp->u.num >= (sp + 1)->u.num)
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goto true;
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goto false;
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}
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}
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static int
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lookup_op(name, table)
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char *name;
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char *const * table;
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{
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register char *const * tp;
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register char const *p;
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char c;
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c = name[1];
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for (tp = table; (p = *tp) != NULL; tp++)
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if (p[1] == c && !strcmp(p, name))
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return (tp - table);
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return (-1);
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}
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static int
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posix_unary_op(argv)
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char **argv;
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{
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struct filestat fs;
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struct value valp;
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int op, c;
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char *opname;
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opname = *argv;
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if ((op = lookup_op(opname, unary_op)) < 0)
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return (-1);
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c = op_argflag[op];
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opname = argv[1];
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valp.u.string = opname;
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if (c == OP_FILE) {
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fs.name = opname;
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fs.rcode = stat(opname, &fs.stat);
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} else if (c != OP_STRING)
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return (-1);
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expr_operator(op, &valp, &fs);
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return (valp.u.num == 0);
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}
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static int
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posix_binary_op(argv)
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char **argv;
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{
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struct value v[2];
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int op, c;
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char *opname;
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opname = argv[1];
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if ((op = lookup_op(opname, binary_op)) < 0)
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return (-1);
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op += FIRST_BINARY_OP;
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c = op_argflag[op];
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if (c == OP_INT) {
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v[0].u.num = chk_atol(argv[0]);
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v[1].u.num = chk_atol(argv[2]);
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} else {
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v[0].u.string = argv[0];
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v[1].u.string = argv[2];
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}
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expr_operator(op, v, NULL);
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return (v[0].u.num == 0);
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}
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/*
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* Integer type checking.
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*/
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static long
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chk_atol(v)
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char *v;
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{
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char *p;
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long r;
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errno = 0;
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r = strtol(v, &p, 10);
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if (errno != 0)
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err("\"%s\" -- out of range.", v);
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while (isspace(*p))
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p++;
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if (*p != '\0')
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err("illegal operand \"%s\" -- expected integer.", v);
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return (r);
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}
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static void
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syntax()
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{
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err("syntax error");
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}
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static void
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overflow()
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{
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err("expression is too complex");
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}
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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void
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#if __STDC__
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err(const char *fmt, ...)
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#else
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err(fmt, va_alist)
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char *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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(void)fprintf(stderr, "test: ");
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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(void)fprintf(stderr, "\n");
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exit(2);
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/* NOTREACHED */
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}
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