662 lines
13 KiB
C
662 lines
13 KiB
C
/* $NetBSD: exp.c,v 1.20 2009/02/14 07:12:29 lukem Exp $ */
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/*-
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* Copyright (c) 1980, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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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. 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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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)exp.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: exp.c,v 1.20 2009/02/14 07:12:29 lukem Exp $");
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#endif
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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 <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifndef SHORT_STRINGS
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#include <string.h>
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#endif /* SHORT_STRINGS */
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#include "csh.h"
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#include "extern.h"
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#define IGNORE 1 /* in ignore, it means to ignore value, just parse */
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#define NOGLOB 2 /* in ignore, it means not to globone */
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#define ADDOP 1
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#define MULOP 2
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#define EQOP 4
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#define RELOP 8
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#define RESTOP 16
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#define ANYOP 31
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#define EQEQ 1
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#define GTR 2
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#define LSS 4
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#define NOTEQ 6
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#define EQMATCH 7
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#define NOTEQMATCH 8
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static int exp1(Char ***, int);
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static int csh_exp2(Char ***, int);
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static int exp2a(Char ***, int);
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static int exp2b(Char ***, int);
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static int exp2c(Char ***, int);
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static Char *exp3(Char ***, int);
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static Char *exp3a(Char ***, int);
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static Char *exp4(Char ***, int);
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static Char *exp5(Char ***, int);
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static Char *exp6(Char ***, int);
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static void evalav(Char **);
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static int isa(Char *, int);
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static int egetn(Char *);
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#ifdef EDEBUG
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static void etracc(char *, Char *, Char ***);
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static void etraci(char *, int, Char ***);
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#endif
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int
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expr(Char ***vp)
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{
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return (exp0(vp, 0));
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}
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int
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exp0(Char ***vp, int ignore)
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{
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int p1;
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p1 = exp1(vp, ignore);
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#ifdef EDEBUG
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etraci("exp0 p1", p1, vp);
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#endif
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if (**vp && eq(**vp, STRor2)) {
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int p2;
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(*vp)++;
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p2 = exp0(vp, (ignore & IGNORE) || p1);
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#ifdef EDEBUG
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etraci("exp0 p2", p2, vp);
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#endif
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return (p1 || p2);
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}
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return (p1);
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}
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static int
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exp1(Char ***vp, int ignore)
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{
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int p1;
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p1 = csh_exp2(vp, ignore);
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#ifdef EDEBUG
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etraci("exp1 p1", p1, vp);
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#endif
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if (**vp && eq(**vp, STRand2)) {
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int p2;
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(*vp)++;
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p2 = exp1(vp, (ignore & IGNORE) || !p1);
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#ifdef EDEBUG
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etraci("exp1 p2", p2, vp);
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#endif
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return (p1 && p2);
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}
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return (p1);
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}
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static int
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csh_exp2(Char ***vp, int ignore)
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{
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int p1;
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p1 = exp2a(vp, ignore);
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#ifdef EDEBUG
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etraci("exp3 p1", p1, vp);
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#endif
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if (**vp && eq(**vp, STRor)) {
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int p2;
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(*vp)++;
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p2 = csh_exp2(vp, ignore);
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#ifdef EDEBUG
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etraci("exp3 p2", p2, vp);
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#endif
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return (p1 | p2);
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}
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return (p1);
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}
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static int
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exp2a(Char ***vp, int ignore)
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{
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int p1;
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p1 = exp2b(vp, ignore);
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#ifdef EDEBUG
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etraci("exp2a p1", p1, vp);
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#endif
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if (**vp && eq(**vp, STRcaret)) {
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int p2;
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(*vp)++;
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p2 = exp2a(vp, ignore);
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#ifdef EDEBUG
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etraci("exp2a p2", p2, vp);
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#endif
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return (p1 ^ p2);
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}
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return (p1);
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}
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static int
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exp2b(Char ***vp, int ignore)
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{
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int p1;
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p1 = exp2c(vp, ignore);
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#ifdef EDEBUG
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etraci("exp2b p1", p1, vp);
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#endif
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if (**vp && eq(**vp, STRand)) {
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int p2;
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(*vp)++;
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p2 = exp2b(vp, ignore);
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#ifdef EDEBUG
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etraci("exp2b p2", p2, vp);
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#endif
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return (p1 & p2);
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}
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return (p1);
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}
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static int
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exp2c(Char ***vp, int ignore)
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{
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Char *p1, *p2;
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int i;
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p1 = exp3(vp, ignore);
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#ifdef EDEBUG
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etracc("exp2c p1", p1, vp);
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#endif
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if ((i = isa(**vp, EQOP)) != 0) {
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(*vp)++;
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if (i == EQMATCH || i == NOTEQMATCH)
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ignore |= NOGLOB;
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p2 = exp3(vp, ignore);
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#ifdef EDEBUG
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etracc("exp2c p2", p2, vp);
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#endif
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if (!(ignore & IGNORE))
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switch (i) {
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case EQEQ:
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i = eq(p1, p2);
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break;
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case EQMATCH:
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i = Gmatch(p1, p2);
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break;
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case NOTEQ:
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i = !eq(p1, p2);
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break;
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case NOTEQMATCH:
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i = !Gmatch(p1, p2);
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break;
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}
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xfree((ptr_t) p1);
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xfree((ptr_t) p2);
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return (i);
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}
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i = egetn(p1);
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xfree((ptr_t) p1);
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return (i);
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}
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static Char *
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exp3(Char ***vp, int ignore)
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{
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Char *p1, *p2;
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int i;
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p1 = exp3a(vp, ignore);
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#ifdef EDEBUG
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etracc("exp3 p1", p1, vp);
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#endif
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if ((i = isa(**vp, RELOP)) != 0) {
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(*vp)++;
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if (**vp && eq(**vp, STRequal))
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i |= 1, (*vp)++;
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p2 = exp3(vp, ignore);
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#ifdef EDEBUG
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etracc("exp3 p2", p2, vp);
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#endif
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if (!(ignore & IGNORE))
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switch (i) {
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case GTR:
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i = egetn(p1) > egetn(p2);
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break;
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case GTR | 1:
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i = egetn(p1) >= egetn(p2);
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break;
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case LSS:
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i = egetn(p1) < egetn(p2);
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break;
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case LSS | 1:
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i = egetn(p1) <= egetn(p2);
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break;
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}
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xfree((ptr_t) p1);
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xfree((ptr_t) p2);
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return (putn(i));
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}
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return (p1);
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}
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static Char *
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exp3a(Char ***vp, int ignore)
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{
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Char *op, *p1, *p2;
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int i;
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p1 = exp4(vp, ignore);
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#ifdef EDEBUG
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etracc("exp3a p1", p1, vp);
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#endif
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op = **vp;
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if (op && any("<>", op[0]) && op[0] == op[1]) {
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(*vp)++;
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p2 = exp3a(vp, ignore);
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#ifdef EDEBUG
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etracc("exp3a p2", p2, vp);
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#endif
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if (op[0] == '<')
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i = egetn(p1) << egetn(p2);
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else
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i = egetn(p1) >> egetn(p2);
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xfree((ptr_t) p1);
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xfree((ptr_t) p2);
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return (putn(i));
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}
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return (p1);
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}
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static Char *
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exp4(Char ***vp, int ignore)
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{
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Char *p1, *p2;
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int i;
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i = 0;
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p1 = exp5(vp, ignore);
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#ifdef EDEBUG
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etracc("exp4 p1", p1, vp);
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#endif
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if (isa(**vp, ADDOP)) {
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Char *op;
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op = *(*vp)++;
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p2 = exp4(vp, ignore);
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#ifdef EDEBUG
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etracc("exp4 p2", p2, vp);
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#endif
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if (!(ignore & IGNORE))
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switch (op[0]) {
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case '+':
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i = egetn(p1) + egetn(p2);
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break;
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case '-':
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i = egetn(p1) - egetn(p2);
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break;
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}
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xfree((ptr_t) p1);
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xfree((ptr_t) p2);
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return (putn(i));
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}
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return (p1);
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}
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static Char *
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exp5(Char ***vp, int ignore)
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{
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Char *p1, *p2;
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int i;
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i = 0;
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p1 = exp6(vp, ignore);
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#ifdef EDEBUG
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etracc("exp5 p1", p1, vp);
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#endif
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if (isa(**vp, MULOP)) {
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Char *op;
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op = *(*vp)++;
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p2 = exp5(vp, ignore);
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#ifdef EDEBUG
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etracc("exp5 p2", p2, vp);
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#endif
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if (!(ignore & IGNORE))
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switch (op[0]) {
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case '*':
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i = egetn(p1) * egetn(p2);
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break;
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case '/':
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i = egetn(p2);
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if (i == 0)
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stderror(ERR_DIV0);
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i = egetn(p1) / i;
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break;
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case '%':
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i = egetn(p2);
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if (i == 0)
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stderror(ERR_MOD0);
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i = egetn(p1) % i;
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break;
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}
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xfree((ptr_t) p1);
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xfree((ptr_t) p2);
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return (putn(i));
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}
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return (p1);
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}
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static Char *
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exp6(Char ***vp, int ignore)
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{
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Char *cp, *dp, *ep;
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int ccode, i;
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i = 0;
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if (**vp == 0)
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stderror(ERR_NAME | ERR_EXPRESSION);
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if (eq(**vp, STRbang)) {
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(*vp)++;
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cp = exp6(vp, ignore);
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#ifdef EDEBUG
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etracc("exp6 ! cp", cp, vp);
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#endif
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i = egetn(cp);
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xfree((ptr_t) cp);
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return (putn(!i));
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}
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if (eq(**vp, STRtilde)) {
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(*vp)++;
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cp = exp6(vp, ignore);
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#ifdef EDEBUG
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etracc("exp6 ~ cp", cp, vp);
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#endif
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i = egetn(cp);
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xfree((ptr_t) cp);
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return (putn(~i));
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}
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if (eq(**vp, STRLparen)) {
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(*vp)++;
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ccode = exp0(vp, ignore);
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#ifdef EDEBUG
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etraci("exp6 () ccode", ccode, vp);
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#endif
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if (**vp == 0 || ***vp != ')')
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stderror(ERR_NAME | ERR_EXPRESSION);
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(*vp)++;
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return (putn(ccode));
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}
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if (eq(**vp, STRLbrace)) {
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struct command faket;
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Char *fakecom[2];
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Char **v;
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faket.t_dtyp = NODE_COMMAND;
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faket.t_dflg = 0;
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faket.t_dcar = faket.t_dcdr = faket.t_dspr = NULL;
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faket.t_dcom = fakecom;
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fakecom[0] = STRfakecom;
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fakecom[1] = NULL;
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(*vp)++;
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v = *vp;
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for (;;) {
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if (!**vp)
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stderror(ERR_NAME | ERR_MISSING, '}');
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if (eq(*(*vp)++, STRRbrace))
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break;
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}
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if (ignore & IGNORE)
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return (Strsave(STRNULL));
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psavejob();
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if (pfork(&faket, -1) == 0) {
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*--(*vp) = 0;
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evalav(v);
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exitstat();
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}
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pwait();
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prestjob();
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#ifdef EDEBUG
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etraci("exp6 {} status", egetn(value(STRstatus)), vp);
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#endif
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return (putn(egetn(value(STRstatus)) == 0));
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}
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if (isa(**vp, ANYOP))
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return (Strsave(STRNULL));
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cp = *(*vp)++;
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if (*cp == '-' && any("erwxfdzopls", cp[1])) {
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struct stat stb;
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if (cp[2] != '\0')
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stderror(ERR_NAME | ERR_FILEINQ);
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/*
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* Detect missing file names by checking for operator in the file name
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* position. However, if an operator name appears there, we must make
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* sure that there's no file by that name (e.g., "/") before announcing
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* an error. Even this check isn't quite right, since it doesn't take
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* globbing into account.
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*/
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if (isa(**vp, ANYOP) && stat(short2str(**vp), &stb))
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stderror(ERR_NAME | ERR_FILENAME);
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dp = *(*vp)++;
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if (ignore & IGNORE)
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return (Strsave(STRNULL));
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ep = globone(dp, G_ERROR);
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switch (cp[1]) {
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case 'r':
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i = !access(short2str(ep), R_OK);
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break;
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case 'w':
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i = !access(short2str(ep), W_OK);
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break;
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case 'x':
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i = !access(short2str(ep), X_OK);
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break;
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default:
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if (cp[1] == 'l' ?
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lstat(short2str(ep), &stb) : stat(short2str(ep), &stb)) {
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xfree((ptr_t) ep);
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return (Strsave(STR0));
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}
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switch (cp[1]) {
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case 'd':
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i = S_ISDIR(stb.st_mode);
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break;
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case 'e':
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i = 1;
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break;
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case 'f':
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i = S_ISREG(stb.st_mode);
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break;
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case 'l':
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#ifdef S_ISLNK
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i = S_ISLNK(stb.st_mode);
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#else
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i = 0;
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#endif
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break;
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case 'o':
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i = stb.st_uid == (uid_t)uid;
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break;
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case 'p':
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#ifdef S_ISFIFO
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i = S_ISFIFO(stb.st_mode);
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#else
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i = 0;
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#endif
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break;
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case 's':
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#ifdef S_ISSOCK
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i = S_ISSOCK(stb.st_mode);
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#else
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i = 0;
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#endif
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break;
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case 'z':
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i = stb.st_size == 0;
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break;
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}
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}
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#ifdef EDEBUG
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etraci("exp6 -? i", i, vp);
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#endif
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xfree((ptr_t) ep);
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return (putn(i));
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}
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#ifdef EDEBUG
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etracc("exp6 default", cp, vp);
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#endif
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return (ignore & NOGLOB ? Strsave(cp) : globone(cp, G_ERROR));
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}
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static void
|
|
evalav(Char **v)
|
|
{
|
|
struct wordent *hp, paraml1, *wdp;
|
|
struct command *t;
|
|
|
|
hp = ¶ml1;
|
|
wdp = hp;
|
|
set(STRstatus, Strsave(STR0));
|
|
hp->prev = hp->next = hp;
|
|
hp->word = STRNULL;
|
|
while (*v) {
|
|
struct wordent *new;
|
|
|
|
new = (struct wordent *)xcalloc(1, sizeof *wdp);
|
|
new->prev = wdp;
|
|
new->next = hp;
|
|
wdp->next = new;
|
|
wdp = new;
|
|
wdp->word = Strsave(*v++);
|
|
}
|
|
hp->prev = wdp;
|
|
alias(¶ml1);
|
|
t = syntax(paraml1.next, ¶ml1, 0);
|
|
if (seterr)
|
|
stderror(ERR_OLD);
|
|
execute(t, -1, NULL, NULL);
|
|
freelex(¶ml1), freesyn(t);
|
|
}
|
|
|
|
static int
|
|
isa(Char *cp, int what)
|
|
{
|
|
if (cp == 0)
|
|
return ((what & RESTOP) != 0);
|
|
if (cp[1] == 0) {
|
|
if (what & ADDOP && (*cp == '+' || *cp == '-'))
|
|
return (1);
|
|
if (what & MULOP && (*cp == '*' || *cp == '/' || *cp == '%'))
|
|
return (1);
|
|
if (what & RESTOP && (*cp == '(' || *cp == ')' || *cp == '!' ||
|
|
*cp == '~' || *cp == '^' || *cp == '"'))
|
|
return (1);
|
|
}
|
|
else if (cp[2] == 0) {
|
|
if (what & RESTOP) {
|
|
if (cp[0] == '|' && cp[1] == '&')
|
|
return (1);
|
|
if (cp[0] == '<' && cp[1] == '<')
|
|
return (1);
|
|
if (cp[0] == '>' && cp[1] == '>')
|
|
return (1);
|
|
}
|
|
if (what & EQOP) {
|
|
if (cp[0] == '=') {
|
|
if (cp[1] == '=')
|
|
return (EQEQ);
|
|
if (cp[1] == '~')
|
|
return (EQMATCH);
|
|
}
|
|
else if (cp[0] == '!') {
|
|
if (cp[1] == '=')
|
|
return (NOTEQ);
|
|
if (cp[1] == '~')
|
|
return (NOTEQMATCH);
|
|
}
|
|
}
|
|
}
|
|
if (what & RELOP) {
|
|
if (*cp == '<')
|
|
return (LSS);
|
|
if (*cp == '>')
|
|
return (GTR);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
egetn(Char *cp)
|
|
{
|
|
if (*cp && *cp != '-' && !Isdigit(*cp))
|
|
stderror(ERR_NAME | ERR_EXPRESSION);
|
|
return (getn(cp));
|
|
}
|
|
|
|
/* Phew! */
|
|
|
|
#ifdef EDEBUG
|
|
static void
|
|
etraci(char *str, int i, Char ***vp)
|
|
{
|
|
(void)fprintf(csherr, "%s=%d\t", str, i);
|
|
blkpr(csherr, *vp);
|
|
(void)fprintf(csherr, "\n");
|
|
}
|
|
static void
|
|
etracc(char *str, Char *cp, Char ***vp)
|
|
{
|
|
(void)fprintf(csherr, "%s=%s\t", str, vis_str(cp));
|
|
blkpr(csherr, *vp);
|
|
(void)fprintf(csherr, "\n");
|
|
}
|
|
#endif
|