mirror of https://github.com/GnoConsortium/gno.git
583 lines
13 KiB
C
583 lines
13 KiB
C
/*
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* $Id: test.c,v 1.3 1997/10/30 03:35:21 gdr Exp $
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*/
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/*-
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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 __GNO__
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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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#endif /* not lint */
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#endif /* ! __GNO__ */
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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 <unistd.h>
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#include <ctype.h>
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#include <err.h>
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#if defined(__STACK_CHECK__)
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#include <gno/gno.h>
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#endif
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#ifdef __ORCAC__ /* these are picked up in <types.h> */
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#undef true
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#undef false
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#endif
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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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|
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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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#ifdef __STACK_CHECK__
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static void
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printStack(void) {
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printf("stack usage: %d bytes\n", _endStackCheck());
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}
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#endif
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int
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main(int argc, 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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#ifdef __STACK_CHECK__
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_beginStackCheck();
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atexit(printStack);
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#endif
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if ((p = argv[0]) == NULL) {
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errx(2, "argc is zero");
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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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errx(1, "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] == NULL || *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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}
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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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}
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} else if (lookup_op(argv[2], andor_op) < 0) {
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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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}
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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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}
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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(1, "malloc failed");
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#ifdef SHELL
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#error "gdr: is this supposed to be %ld ? "
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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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"%ld", 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) {
|
|
op = AND1;
|
|
if (skipping || expr_is_false(valsp - 1))
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|
skipping++;
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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(struct value *val)
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|
{
|
|
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
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|
expr_operator(int op, struct value *sp, struct filestat *fs)
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|
{
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|
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;
|
|
#ifdef __GNO__
|
|
case ISREAD:
|
|
i = S_IREAD;
|
|
goto filebit; /* true if (stat.st_mode & i) != 0 */
|
|
case ISWRITE:
|
|
i = S_IWRITE;
|
|
goto filebit; /* true if (stat.st_mode & i) != 0 */
|
|
case ISEXEC:
|
|
i = S_IEXEC;
|
|
goto filebit; /* true if (stat.st_mode & i) != 0 */
|
|
#else /* ! __GNO__ */
|
|
case ISREAD:
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|
i = S_IROTH;
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|
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 */
|
|
#endif /* not __GNO__ */
|
|
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 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(char *name, char *const *table)
|
|
{
|
|
register char *const * tp;
|
|
register char const *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(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(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) {
|
|
v[0].u.num = chk_atol(argv[0]);
|
|
v[1].u.num = chk_atol(argv[2]);
|
|
} 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 long
|
|
chk_atol(char *v)
|
|
{
|
|
char *p;
|
|
long r;
|
|
|
|
errno = 0;
|
|
r = strtol(v, &p, 10);
|
|
if (errno != 0)
|
|
errx(1, "\"%s\" -- out of range.", v);
|
|
while (isspace(*p))
|
|
p++;
|
|
if (*p != '\0')
|
|
errx(1, "illegal operand \"%s\" -- expected integer.", v);
|
|
return (r);
|
|
}
|
|
|
|
static void
|
|
syntax(void)
|
|
{
|
|
errx(1, "syntax error");
|
|
}
|
|
|
|
static void
|
|
overflow(void)
|
|
{
|
|
errx(1, "expression is too complex");
|
|
}
|