641 lines
13 KiB
C
641 lines
13 KiB
C
/* $NetBSD: parse.c,v 1.17 2007/07/16 18:26:10 christos 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[] = "@(#)parse.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: parse.c,v 1.17 2007/07/16 18:26:10 christos 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 <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include "csh.h"
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#include "extern.h"
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static void asyntax(struct wordent *, struct wordent *);
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static void asyn0(struct wordent *, struct wordent *);
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static void asyn3(struct wordent *, struct wordent *);
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static struct wordent *freenod(struct wordent *, struct wordent *);
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static struct command *syn0(struct wordent *, struct wordent *, int);
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static struct command *syn1(struct wordent *, struct wordent *, int);
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static struct command *syn1a(struct wordent *, struct wordent *, int);
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static struct command *syn1b(struct wordent *, struct wordent *, int);
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static struct command *syn2(struct wordent *, struct wordent *, int);
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static struct command *syn3(struct wordent *, struct wordent *, int);
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#define ALEFT 21 /* max of 20 alias expansions */
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#define HLEFT 11 /* max of 10 history expansions */
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/*
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* Perform aliasing on the word list lex
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* Do a (very rudimentary) parse to separate into commands.
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* If word 0 of a command has an alias, do it.
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* Repeat a maximum of 20 times.
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*/
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static int aleft;
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extern int hleft;
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void
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alias(struct wordent *lexp)
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{
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jmp_buf osetexit;
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aleft = ALEFT;
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hleft = HLEFT;
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getexit(osetexit);
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(void)setexit();
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if (haderr) {
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resexit(osetexit);
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reset();
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}
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if (--aleft == 0)
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stderror(ERR_ALIASLOOP);
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asyntax(lexp->next, lexp);
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resexit(osetexit);
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}
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static void
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asyntax(struct wordent *p1, struct wordent *p2)
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{
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while (p1 != p2)
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if (any(";&\n", p1->word[0]))
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p1 = p1->next;
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else {
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asyn0(p1, p2);
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return;
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}
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}
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static void
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asyn0(struct wordent *p1, struct wordent *p2)
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{
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struct wordent *p;
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int l;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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l++;
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continue;
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case ')':
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l--;
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if (l < 0)
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stderror(ERR_TOOMANYRP);
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continue;
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case '>':
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if (p->next != p2 && eq(p->next->word, STRand))
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p = p->next;
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continue;
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case '&':
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case '|':
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case ';':
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case '\n':
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if (l != 0)
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continue;
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asyn3(p1, p);
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asyntax(p->next, p2);
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return;
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}
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if (l == 0)
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asyn3(p1, p2);
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}
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static void
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asyn3(struct wordent *p1, struct wordent *p2)
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{
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struct varent *ap;
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struct wordent alout;
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int redid;
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if (p1 == p2)
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return;
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if (p1->word[0] == '(') {
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for (p2 = p2->prev; p2->word[0] != ')'; p2 = p2->prev)
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if (p2 == p1)
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return;
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if (p2 == p1->next)
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return;
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asyn0(p1->next, p2);
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return;
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}
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ap = adrof1(p1->word, &aliases);
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if (ap == 0)
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return;
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alhistp = p1->prev;
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alhistt = p2;
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alvec = ap->vec;
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redid = lex(&alout);
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alhistp = alhistt = 0;
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alvec = 0;
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if (seterr) {
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freelex(&alout);
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stderror(ERR_OLD);
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}
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if (p1->word[0] && eq(p1->word, alout.next->word)) {
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Char *cp;
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cp = alout.next->word;
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alout.next->word = Strspl(STRQNULL, cp);
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xfree((ptr_t) cp);
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}
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p1 = freenod(p1, redid ? p2 : p1->next);
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if (alout.next != &alout) {
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p1->next->prev = alout.prev->prev;
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alout.prev->prev->next = p1->next;
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alout.next->prev = p1;
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p1->next = alout.next;
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xfree((ptr_t)alout.prev->word);
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xfree((ptr_t)(alout.prev));
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}
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reset(); /* throw! */
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}
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static struct wordent *
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freenod(struct wordent *p1, struct wordent *p2)
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{
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struct wordent *retp;
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retp = p1->prev;
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while (p1 != p2) {
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xfree((ptr_t)p1->word);
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p1 = p1->next;
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xfree((ptr_t) (p1->prev));
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}
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retp->next = p2;
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p2->prev = retp;
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return (retp);
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}
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#define PHERE 1
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#define PIN 2
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#define POUT 4
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#define PERR 8
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/*
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* syntax
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* empty
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* syn0
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*/
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struct command *
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syntax(struct wordent *p1, struct wordent *p2, int flags)
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{
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while (p1 != p2)
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if (any(";&\n", p1->word[0]))
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p1 = p1->next;
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else
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return (syn0(p1, p2, flags));
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return (0);
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}
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/*
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* syn0
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* syn1
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* syn1 & syntax
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*/
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static struct command *
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syn0(struct wordent *p1, struct wordent *p2, int flags)
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{
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struct wordent *p;
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struct command *t, *t1;
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int l;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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l++;
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continue;
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case ')':
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l--;
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if (l < 0)
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seterror(ERR_TOOMANYRP);
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continue;
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case '|':
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if (p->word[1] == '|')
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continue;
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/* FALLTHROUGH */
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case '>':
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if (p->next != p2 && eq(p->next->word, STRand))
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p = p->next;
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continue;
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case '&':
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if (l != 0)
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break;
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if (p->word[1] == '&')
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continue;
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t1 = syn1(p1, p, flags);
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if (t1->t_dtyp == NODE_LIST ||
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t1->t_dtyp == NODE_AND ||
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t1->t_dtyp == NODE_OR) {
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t = (struct command *)xcalloc(1, sizeof(*t));
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t->t_dtyp = NODE_PAREN;
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t->t_dflg = F_AMPERSAND | F_NOINTERRUPT;
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t->t_dspr = t1;
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t1 = t;
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}
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else
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t1->t_dflg |= F_AMPERSAND | F_NOINTERRUPT;
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t = (struct command *)xcalloc(1, sizeof(*t));
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t->t_dtyp = NODE_LIST;
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t->t_dflg = 0;
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t->t_dcar = t1;
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t->t_dcdr = syntax(p, p2, flags);
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return (t);
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}
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if (l == 0)
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return (syn1(p1, p2, flags));
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seterror(ERR_TOOMANYLP);
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return (0);
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}
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/*
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* syn1
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* syn1a
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* syn1a ; syntax
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*/
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static struct command *
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syn1(struct wordent *p1, struct wordent *p2, int flags)
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{
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struct wordent *p;
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struct command *t;
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int l;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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l++;
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continue;
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case ')':
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l--;
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continue;
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case ';':
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case '\n':
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if (l != 0)
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break;
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t = (struct command *) xcalloc(1, sizeof(*t));
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t->t_dtyp = NODE_LIST;
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t->t_dcar = syn1a(p1, p, flags);
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t->t_dcdr = syntax(p->next, p2, flags);
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if (t->t_dcdr == 0)
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t->t_dcdr = t->t_dcar, t->t_dcar = 0;
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return (t);
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}
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return (syn1a(p1, p2, flags));
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}
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/*
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* syn1a
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* syn1b
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* syn1b || syn1a
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*/
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static struct command *
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syn1a(struct wordent *p1, struct wordent *p2, int flags)
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{
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struct wordent *p;
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struct command *t;
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int l;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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l++;
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continue;
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case ')':
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l--;
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continue;
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case '|':
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if (p->word[1] != '|')
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continue;
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if (l == 0) {
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t = (struct command *)xcalloc(1, sizeof(*t));
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t->t_dtyp = NODE_OR;
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t->t_dcar = syn1b(p1, p, flags);
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t->t_dcdr = syn1a(p->next, p2, flags);
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t->t_dflg = 0;
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return (t);
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}
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continue;
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}
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return (syn1b(p1, p2, flags));
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}
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/*
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* syn1b
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* syn2
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* syn2 && syn1b
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*/
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static struct command *
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syn1b(struct wordent *p1, struct wordent *p2, int flags)
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{
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struct wordent *p;
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struct command *t;
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int l;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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l++;
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continue;
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case ')':
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l--;
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continue;
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case '&':
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if (p->word[1] == '&' && l == 0) {
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t = (struct command *)xcalloc(1, sizeof(*t));
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t->t_dtyp = NODE_AND;
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t->t_dcar = syn2(p1, p, flags);
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t->t_dcdr = syn1b(p->next, p2, flags);
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t->t_dflg = 0;
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return (t);
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}
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continue;
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}
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return (syn2(p1, p2, flags));
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}
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/*
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* syn2
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* syn3
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* syn3 | syn2
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* syn3 |& syn2
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*/
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static struct command *
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syn2(struct wordent *p1, struct wordent *p2, int flags)
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{
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struct wordent *p, *pn;
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struct command *t;
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int f, l;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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l++;
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continue;
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case ')':
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l--;
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continue;
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case '|':
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if (l != 0)
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continue;
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t = (struct command *)xcalloc(1, sizeof(*t));
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f = flags | POUT;
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pn = p->next;
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if (pn != p2 && pn->word[0] == '&') {
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f |= PERR;
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t->t_dflg |= F_STDERR;
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}
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t->t_dtyp = NODE_PIPE;
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t->t_dcar = syn3(p1, p, f);
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if (pn != p2 && pn->word[0] == '&')
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p = pn;
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t->t_dcdr = syn2(p->next, p2, flags | PIN);
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return (t);
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}
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return (syn3(p1, p2, flags));
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}
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static char RELPAR[] = {'<', '>', '(', ')', '\0'};
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/*
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* syn3
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* ( syn0 ) [ < in ] [ > out ]
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* word word* [ < in ] [ > out ]
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* KEYWORD ( word* ) word* [ < in ] [ > out ]
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*
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* KEYWORD = (@ exit foreach if set switch test while)
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*/
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static struct command *
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syn3(struct wordent *p1, struct wordent *p2, int flags)
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{
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struct wordent *lp, *p, *rp;
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struct command *t;
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Char **av;
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int c, l, n;
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int specp;
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specp = 0;
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if (p1 != p2) {
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p = p1;
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again:
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switch (srchx(p->word)) {
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case T_ELSE:
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p = p->next;
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if (p != p2)
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goto again;
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break;
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case T_EXIT:
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case T_FOREACH:
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case T_IF:
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case T_LET:
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case T_SET:
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case T_SWITCH:
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case T_WHILE:
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specp = 1;
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break;
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}
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}
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n = 0;
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l = 0;
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for (p = p1; p != p2; p = p->next)
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switch (p->word[0]) {
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case '(':
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if (specp)
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n++;
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l++;
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continue;
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case ')':
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if (specp)
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n++;
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l--;
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continue;
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case '>':
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case '<':
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if (l != 0) {
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if (specp)
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n++;
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continue;
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}
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if (p->next == p2)
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continue;
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if (any(RELPAR, p->next->word[0]))
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continue;
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n--;
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continue;
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default:
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if (!specp && l != 0)
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continue;
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n++;
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continue;
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}
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if (n < 0)
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n = 0;
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t = (struct command *)xcalloc(1, sizeof(*t));
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av = (Char **)xcalloc((size_t)(n + 1), sizeof(Char **));
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t->t_dcom = av;
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n = 0;
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if (p2->word[0] == ')')
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t->t_dflg = F_NOFORK;
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lp = 0;
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rp = 0;
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l = 0;
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for (p = p1; p != p2; p = p->next) {
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c = p->word[0];
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switch (c) {
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case '(':
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if (l == 0) {
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if (lp != 0 && !specp)
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seterror(ERR_BADPLP);
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lp = p->next;
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}
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l++;
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goto savep;
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case ')':
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l--;
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if (l == 0)
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rp = p;
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goto savep;
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case '>':
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if (l != 0)
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goto savep;
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if (p->word[1] == '>')
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t->t_dflg |= F_APPEND;
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if (p->next != p2 && eq(p->next->word, STRand)) {
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t->t_dflg |= F_STDERR, p = p->next;
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if (flags & (POUT | PERR)) {
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seterror(ERR_OUTRED);
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continue;
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}
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}
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if (p->next != p2 && eq(p->next->word, STRbang))
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t->t_dflg |= F_OVERWRITE, p = p->next;
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|
if (p->next == p2) {
|
|
seterror(ERR_MISRED);
|
|
continue;
|
|
}
|
|
p = p->next;
|
|
if (any(RELPAR, p->word[0])) {
|
|
seterror(ERR_MISRED);
|
|
continue;
|
|
}
|
|
if ((flags & POUT) && ((flags & PERR) == 0 || t->t_drit))
|
|
seterror(ERR_OUTRED);
|
|
else
|
|
t->t_drit = Strsave(p->word);
|
|
continue;
|
|
case '<':
|
|
if (l != 0)
|
|
goto savep;
|
|
if (p->word[1] == '<')
|
|
t->t_dflg |= F_READ;
|
|
if (p->next == p2) {
|
|
seterror(ERR_MISRED);
|
|
continue;
|
|
}
|
|
p = p->next;
|
|
if (any(RELPAR, p->word[0])) {
|
|
seterror(ERR_MISRED);
|
|
continue;
|
|
}
|
|
if ((flags & PHERE) && (t->t_dflg & F_READ))
|
|
seterror(ERR_REDPAR);
|
|
else if ((flags & PIN) || t->t_dlef)
|
|
seterror(ERR_INRED);
|
|
else
|
|
t->t_dlef = Strsave(p->word);
|
|
continue;
|
|
savep:
|
|
if (!specp)
|
|
continue;
|
|
/* FALLTHROUGH */
|
|
default:
|
|
if (l != 0 && !specp)
|
|
continue;
|
|
if (seterr == 0)
|
|
av[n] = Strsave(p->word);
|
|
n++;
|
|
continue;
|
|
}
|
|
}
|
|
if (lp != 0 && !specp) {
|
|
if (n != 0)
|
|
seterror(ERR_BADPLPS);
|
|
t->t_dtyp = NODE_PAREN;
|
|
t->t_dspr = syn0(lp, rp, PHERE);
|
|
}
|
|
else {
|
|
if (n == 0)
|
|
seterror(ERR_NULLCOM);
|
|
t->t_dtyp = NODE_COMMAND;
|
|
}
|
|
return (t);
|
|
}
|
|
|
|
void
|
|
freesyn(struct command *t)
|
|
{
|
|
Char **v;
|
|
|
|
if (t == 0)
|
|
return;
|
|
switch (t->t_dtyp) {
|
|
case NODE_COMMAND:
|
|
for (v = t->t_dcom; *v; v++)
|
|
xfree((ptr_t) * v);
|
|
xfree((ptr_t)(t->t_dcom));
|
|
xfree((ptr_t)t->t_dlef);
|
|
xfree((ptr_t)t->t_drit);
|
|
break;
|
|
case NODE_PAREN:
|
|
freesyn(t->t_dspr);
|
|
xfree((ptr_t)t->t_dlef);
|
|
xfree((ptr_t)t->t_drit);
|
|
break;
|
|
case NODE_AND:
|
|
case NODE_OR:
|
|
case NODE_PIPE:
|
|
case NODE_LIST:
|
|
freesyn(t->t_dcar), freesyn(t->t_dcdr);
|
|
break;
|
|
}
|
|
xfree((ptr_t)t);
|
|
}
|