1661 lines
34 KiB
C
1661 lines
34 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1997-2005
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* Herbert Xu <herbert@gondor.apana.org.au>. 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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)expand.c 8.5 (Berkeley) 5/15/95";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* Routines to expand arguments to commands. We have to deal with
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* backquotes, shell variables, and file metacharacters.
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*/
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#include "shell.h"
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#include "main.h"
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#include "nodes.h"
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#include "eval.h"
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#include "expand.h"
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#include "syntax.h"
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#include "parser.h"
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#include "jobs.h"
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#include "options.h"
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#include "var.h"
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#include "input.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "mystring.h"
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#include "arith.h"
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#include "show.h"
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/*
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* Structure specifying which parts of the string should be searched
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* for IFS characters.
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*/
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struct ifsregion {
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struct ifsregion *next; /* next region in list */
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int begoff; /* offset of start of region */
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int endoff; /* offset of end of region */
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int inquotes; /* search for nul bytes only */
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};
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static char *expdest; /* output of current string */
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static struct nodelist *argbackq; /* list of back quote expressions */
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static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
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static struct ifsregion *ifslastp; /* last struct in list */
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static struct arglist exparg; /* holds expanded arg list */
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static void argstr(char *, int);
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static char *exptilde(char *, int);
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static void expbackq(union node *, int, int);
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static int subevalvar(char *, char *, int, int, int, int, int);
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static char *evalvar(char *, int);
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static int varisset(char *, int);
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static void varvalue(char *, int, int, int);
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static void recordregion(int, int, int);
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static void removerecordregions(int);
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static void ifsbreakup(char *, struct arglist *);
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static void expandmeta(struct strlist *, int);
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static void expmeta(char *, char *);
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static void addfname(char *);
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static struct strlist *expsort(struct strlist *);
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static struct strlist *msort(struct strlist *, int);
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static char *cvtnum(int, char *);
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static int collate_range_cmp(int, int);
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static int
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collate_range_cmp(int c1, int c2)
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{
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static char s1[2], s2[2];
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s1[0] = c1;
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s2[0] = c2;
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return (strcoll(s1, s2));
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}
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/*
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* Expand shell variables and backquotes inside a here document.
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* union node *arg the document
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* int fd; where to write the expanded version
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*/
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void
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expandhere(union node *arg, int fd)
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{
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expandarg(arg, (struct arglist *)NULL, 0);
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xwrite(fd, stackblock(), expdest - stackblock());
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}
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static char *
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stputs_quotes(const char *data, const char *syntax, char *p)
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{
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while (*data) {
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CHECKSTRSPACE(2, p);
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if (syntax[(int)*data] == CCTL)
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USTPUTC(CTLESC, p);
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USTPUTC(*data++, p);
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}
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return (p);
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}
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#define STPUTS_QUOTES(data, syntax, p) p = stputs_quotes((data), syntax, p)
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/*
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* Perform expansions on an argument, placing the resulting list of arguments
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* in arglist. Parameter expansion, command substitution and arithmetic
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* expansion are always performed; additional expansions can be requested
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* via flag (EXP_*).
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* The result is left in the stack string.
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* When arglist is NULL, perform here document expansion.
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*
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* Caution: this function uses global state and is not reentrant.
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* However, a new invocation after an interrupted invocation is safe
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* and will reset the global state for the new call.
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*/
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void
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expandarg(union node *arg, struct arglist *arglist, int flag)
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{
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struct strlist *sp;
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char *p;
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argbackq = arg->narg.backquote;
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STARTSTACKSTR(expdest);
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ifsfirst.next = NULL;
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ifslastp = NULL;
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argstr(arg->narg.text, flag);
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if (arglist == NULL) {
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return; /* here document expanded */
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}
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STPUTC('\0', expdest);
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p = grabstackstr(expdest);
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exparg.lastp = &exparg.list;
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/*
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* TODO - EXP_REDIR
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*/
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if (flag & EXP_FULL) {
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ifsbreakup(p, &exparg);
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*exparg.lastp = NULL;
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exparg.lastp = &exparg.list;
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expandmeta(exparg.list, flag);
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} else {
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if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
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rmescapes(p);
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sp = (struct strlist *)stalloc(sizeof (struct strlist));
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sp->text = p;
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*exparg.lastp = sp;
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exparg.lastp = &sp->next;
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}
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while (ifsfirst.next != NULL) {
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struct ifsregion *ifsp;
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INTOFF;
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ifsp = ifsfirst.next->next;
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ckfree(ifsfirst.next);
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ifsfirst.next = ifsp;
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INTON;
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}
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*exparg.lastp = NULL;
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if (exparg.list) {
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*arglist->lastp = exparg.list;
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arglist->lastp = exparg.lastp;
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}
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}
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/*
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* Perform parameter expansion, command substitution and arithmetic
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* expansion, and tilde expansion if requested via EXP_TILDE/EXP_VARTILDE.
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* Processing ends at a CTLENDVAR character as well as '\0'.
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* This is used to expand word in ${var+word} etc.
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* If EXP_FULL, EXP_CASE or EXP_REDIR are set, keep and/or generate CTLESC
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* characters to allow for further processing.
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* If EXP_FULL is set, also preserve CTLQUOTEMARK characters.
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*/
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static void
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argstr(char *p, int flag)
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{
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char c;
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int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
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int firsteq = 1;
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int split_lit;
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int lit_quoted;
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split_lit = flag & EXP_SPLIT_LIT;
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lit_quoted = flag & EXP_LIT_QUOTED;
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flag &= ~(EXP_SPLIT_LIT | EXP_LIT_QUOTED);
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if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
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p = exptilde(p, flag);
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for (;;) {
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CHECKSTRSPACE(2, expdest);
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switch (c = *p++) {
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case '\0':
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case CTLENDVAR:
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goto breakloop;
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case CTLQUOTEMARK:
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lit_quoted = 1;
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/* "$@" syntax adherence hack */
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if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
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break;
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if ((flag & EXP_FULL) != 0)
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USTPUTC(c, expdest);
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break;
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case CTLQUOTEEND:
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lit_quoted = 0;
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break;
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case CTLESC:
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if (quotes)
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USTPUTC(c, expdest);
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c = *p++;
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USTPUTC(c, expdest);
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if (split_lit && !lit_quoted)
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recordregion(expdest - stackblock() -
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(quotes ? 2 : 1),
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expdest - stackblock(), 0);
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break;
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case CTLVAR:
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p = evalvar(p, flag);
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break;
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case CTLBACKQ:
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case CTLBACKQ|CTLQUOTE:
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expbackq(argbackq->n, c & CTLQUOTE, flag);
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argbackq = argbackq->next;
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break;
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case CTLENDARI:
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expari(flag);
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break;
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case ':':
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case '=':
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/*
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* sort of a hack - expand tildes in variable
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* assignments (after the first '=' and after ':'s).
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*/
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USTPUTC(c, expdest);
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if (split_lit && !lit_quoted)
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recordregion(expdest - stackblock() - 1,
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expdest - stackblock(), 0);
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if (flag & EXP_VARTILDE && *p == '~' &&
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(c != '=' || firsteq)) {
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if (c == '=')
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firsteq = 0;
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p = exptilde(p, flag);
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}
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break;
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default:
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USTPUTC(c, expdest);
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if (split_lit && !lit_quoted)
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recordregion(expdest - stackblock() - 1,
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expdest - stackblock(), 0);
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}
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}
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breakloop:;
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}
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/*
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* Perform tilde expansion, placing the result in the stack string and
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* returning the next position in the input string to process.
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*/
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static char *
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exptilde(char *p, int flag)
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{
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char c, *startp = p;
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struct passwd *pw;
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char *home;
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int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
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while ((c = *p) != '\0') {
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switch(c) {
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case CTLESC: /* This means CTL* are always considered quoted. */
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case CTLVAR:
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case CTLBACKQ:
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case CTLBACKQ | CTLQUOTE:
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case CTLARI:
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case CTLENDARI:
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case CTLQUOTEMARK:
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return (startp);
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case ':':
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if (flag & EXP_VARTILDE)
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goto done;
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break;
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case '/':
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case CTLENDVAR:
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goto done;
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}
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p++;
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}
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done:
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*p = '\0';
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if (*(startp+1) == '\0') {
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if ((home = lookupvar("HOME")) == NULL)
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goto lose;
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} else {
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if ((pw = getpwnam(startp+1)) == NULL)
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goto lose;
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home = pw->pw_dir;
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}
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if (*home == '\0')
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goto lose;
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*p = c;
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if (quotes)
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STPUTS_QUOTES(home, SQSYNTAX, expdest);
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else
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STPUTS(home, expdest);
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return (p);
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lose:
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*p = c;
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return (startp);
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}
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static void
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removerecordregions(int endoff)
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{
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if (ifslastp == NULL)
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return;
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if (ifsfirst.endoff > endoff) {
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while (ifsfirst.next != NULL) {
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struct ifsregion *ifsp;
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INTOFF;
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ifsp = ifsfirst.next->next;
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ckfree(ifsfirst.next);
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ifsfirst.next = ifsp;
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INTON;
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}
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if (ifsfirst.begoff > endoff)
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ifslastp = NULL;
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else {
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ifslastp = &ifsfirst;
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ifsfirst.endoff = endoff;
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}
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return;
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}
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ifslastp = &ifsfirst;
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while (ifslastp->next && ifslastp->next->begoff < endoff)
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ifslastp=ifslastp->next;
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while (ifslastp->next != NULL) {
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struct ifsregion *ifsp;
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INTOFF;
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ifsp = ifslastp->next->next;
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ckfree(ifslastp->next);
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ifslastp->next = ifsp;
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INTON;
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}
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if (ifslastp->endoff > endoff)
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ifslastp->endoff = endoff;
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}
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/*
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* Expand arithmetic expression. Backup to start of expression,
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* evaluate, place result in (backed up) result, adjust string position.
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*/
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void
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expari(int flag)
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{
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char *p, *q, *start;
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arith_t result;
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int begoff;
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int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
|
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int quoted;
|
|
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/*
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* This routine is slightly over-complicated for
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* efficiency. First we make sure there is
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* enough space for the result, which may be bigger
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* than the expression. Next we
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* scan backwards looking for the start of arithmetic. If the
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* next previous character is a CTLESC character, then we
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* have to rescan starting from the beginning since CTLESC
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* characters have to be processed left to right.
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*/
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CHECKSTRSPACE(DIGITS(result) - 2, expdest);
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USTPUTC('\0', expdest);
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start = stackblock();
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p = expdest - 2;
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while (p >= start && *p != CTLARI)
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--p;
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if (p < start || *p != CTLARI)
|
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error("missing CTLARI (shouldn't happen)");
|
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if (p > start && *(p - 1) == CTLESC)
|
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for (p = start; *p != CTLARI; p++)
|
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if (*p == CTLESC)
|
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p++;
|
|
|
|
if (p[1] == '"')
|
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quoted=1;
|
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else
|
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quoted=0;
|
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begoff = p - start;
|
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removerecordregions(begoff);
|
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if (quotes)
|
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rmescapes(p+2);
|
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q = grabstackstr(expdest);
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result = arith(p+2);
|
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ungrabstackstr(q, expdest);
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fmtstr(p, DIGITS(result), ARITH_FORMAT_STR, result);
|
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while (*p++)
|
|
;
|
|
if (quoted == 0)
|
|
recordregion(begoff, p - 1 - start, 0);
|
|
result = expdest - p + 1;
|
|
STADJUST(-result, expdest);
|
|
}
|
|
|
|
|
|
/*
|
|
* Perform command substitution.
|
|
*/
|
|
static void
|
|
expbackq(union node *cmd, int quoted, int flag)
|
|
{
|
|
struct backcmd in;
|
|
int i;
|
|
char buf[128];
|
|
char *p;
|
|
char *dest = expdest;
|
|
struct ifsregion saveifs, *savelastp;
|
|
struct nodelist *saveargbackq;
|
|
char lastc;
|
|
int startloc = dest - stackblock();
|
|
char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
|
|
int nnl;
|
|
|
|
INTOFF;
|
|
saveifs = ifsfirst;
|
|
savelastp = ifslastp;
|
|
saveargbackq = argbackq;
|
|
p = grabstackstr(dest);
|
|
evalbackcmd(cmd, &in);
|
|
ungrabstackstr(p, dest);
|
|
ifsfirst = saveifs;
|
|
ifslastp = savelastp;
|
|
argbackq = saveargbackq;
|
|
|
|
p = in.buf;
|
|
lastc = '\0';
|
|
nnl = 0;
|
|
/* Don't copy trailing newlines */
|
|
for (;;) {
|
|
if (--in.nleft < 0) {
|
|
if (in.fd < 0)
|
|
break;
|
|
while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
|
|
TRACE(("expbackq: read returns %d\n", i));
|
|
if (i <= 0)
|
|
break;
|
|
p = buf;
|
|
in.nleft = i - 1;
|
|
}
|
|
lastc = *p++;
|
|
if (lastc != '\0') {
|
|
if (lastc == '\n') {
|
|
nnl++;
|
|
} else {
|
|
CHECKSTRSPACE(nnl + 2, dest);
|
|
while (nnl > 0) {
|
|
nnl--;
|
|
USTPUTC('\n', dest);
|
|
}
|
|
if (quotes && syntax[(int)lastc] == CCTL)
|
|
USTPUTC(CTLESC, dest);
|
|
USTPUTC(lastc, dest);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (in.fd >= 0)
|
|
close(in.fd);
|
|
if (in.buf)
|
|
ckfree(in.buf);
|
|
if (in.jp)
|
|
exitstatus = waitforjob(in.jp, (int *)NULL);
|
|
if (quoted == 0)
|
|
recordregion(startloc, dest - stackblock(), 0);
|
|
TRACE(("expbackq: size=%td: \"%.*s\"\n",
|
|
((dest - stackblock()) - startloc),
|
|
(int)((dest - stackblock()) - startloc),
|
|
stackblock() + startloc));
|
|
expdest = dest;
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
|
|
int varflags, int quotes)
|
|
{
|
|
char *startp;
|
|
char *loc = NULL;
|
|
char *q;
|
|
int c = 0;
|
|
struct nodelist *saveargbackq = argbackq;
|
|
int amount;
|
|
|
|
argstr(p, (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX ||
|
|
subtype == VSTRIMRIGHT || subtype == VSTRIMRIGHTMAX ?
|
|
EXP_CASE : 0) | EXP_TILDE);
|
|
STACKSTRNUL(expdest);
|
|
argbackq = saveargbackq;
|
|
startp = stackblock() + startloc;
|
|
if (str == NULL)
|
|
str = stackblock() + strloc;
|
|
|
|
switch (subtype) {
|
|
case VSASSIGN:
|
|
setvar(str, startp, 0);
|
|
amount = startp - expdest;
|
|
STADJUST(amount, expdest);
|
|
varflags &= ~VSNUL;
|
|
return 1;
|
|
|
|
case VSQUESTION:
|
|
if (*p != CTLENDVAR) {
|
|
outfmt(out2, "%s\n", startp);
|
|
error((char *)NULL);
|
|
}
|
|
error("%.*s: parameter %snot set", (int)(p - str - 1),
|
|
str, (varflags & VSNUL) ? "null or "
|
|
: nullstr);
|
|
return 0;
|
|
|
|
case VSTRIMLEFT:
|
|
for (loc = startp; loc < str; loc++) {
|
|
c = *loc;
|
|
*loc = '\0';
|
|
if (patmatch(str, startp, quotes)) {
|
|
*loc = c;
|
|
goto recordleft;
|
|
}
|
|
*loc = c;
|
|
if (quotes && *loc == CTLESC)
|
|
loc++;
|
|
}
|
|
return 0;
|
|
|
|
case VSTRIMLEFTMAX:
|
|
for (loc = str - 1; loc >= startp;) {
|
|
c = *loc;
|
|
*loc = '\0';
|
|
if (patmatch(str, startp, quotes)) {
|
|
*loc = c;
|
|
goto recordleft;
|
|
}
|
|
*loc = c;
|
|
loc--;
|
|
if (quotes && loc > startp && *(loc - 1) == CTLESC) {
|
|
for (q = startp; q < loc; q++)
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (q > loc)
|
|
loc--;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
case VSTRIMRIGHT:
|
|
for (loc = str - 1; loc >= startp;) {
|
|
if (patmatch(str, loc, quotes)) {
|
|
amount = loc - expdest;
|
|
STADJUST(amount, expdest);
|
|
return 1;
|
|
}
|
|
loc--;
|
|
if (quotes && loc > startp && *(loc - 1) == CTLESC) {
|
|
for (q = startp; q < loc; q++)
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (q > loc)
|
|
loc--;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
case VSTRIMRIGHTMAX:
|
|
for (loc = startp; loc < str - 1; loc++) {
|
|
if (patmatch(str, loc, quotes)) {
|
|
amount = loc - expdest;
|
|
STADJUST(amount, expdest);
|
|
return 1;
|
|
}
|
|
if (quotes && *loc == CTLESC)
|
|
loc++;
|
|
}
|
|
return 0;
|
|
|
|
|
|
default:
|
|
abort();
|
|
}
|
|
|
|
recordleft:
|
|
amount = ((str - 1) - (loc - startp)) - expdest;
|
|
STADJUST(amount, expdest);
|
|
while (loc != str - 1)
|
|
*startp++ = *loc++;
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Expand a variable, and return a pointer to the next character in the
|
|
* input string.
|
|
*/
|
|
|
|
static char *
|
|
evalvar(char *p, int flag)
|
|
{
|
|
int subtype;
|
|
int varflags;
|
|
char *var;
|
|
char *val;
|
|
int patloc;
|
|
int c;
|
|
int set;
|
|
int special;
|
|
int startloc;
|
|
int varlen;
|
|
int easy;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR);
|
|
|
|
varflags = (unsigned char)*p++;
|
|
subtype = varflags & VSTYPE;
|
|
var = p;
|
|
special = 0;
|
|
if (! is_name(*p))
|
|
special = 1;
|
|
p = strchr(p, '=') + 1;
|
|
again: /* jump here after setting a variable with ${var=text} */
|
|
if (varflags & VSLINENO) {
|
|
set = 1;
|
|
special = 0;
|
|
val = var;
|
|
p[-1] = '\0'; /* temporarily overwrite '=' to have \0
|
|
terminated string */
|
|
} else if (special) {
|
|
set = varisset(var, varflags & VSNUL);
|
|
val = NULL;
|
|
} else {
|
|
val = bltinlookup(var, 1);
|
|
if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
|
|
val = NULL;
|
|
set = 0;
|
|
} else
|
|
set = 1;
|
|
}
|
|
varlen = 0;
|
|
startloc = expdest - stackblock();
|
|
if (!set && uflag && *var != '@' && *var != '*') {
|
|
switch (subtype) {
|
|
case VSNORMAL:
|
|
case VSTRIMLEFT:
|
|
case VSTRIMLEFTMAX:
|
|
case VSTRIMRIGHT:
|
|
case VSTRIMRIGHTMAX:
|
|
case VSLENGTH:
|
|
error("%.*s: parameter not set", (int)(p - var - 1),
|
|
var);
|
|
}
|
|
}
|
|
if (set && subtype != VSPLUS) {
|
|
/* insert the value of the variable */
|
|
if (special) {
|
|
varvalue(var, varflags & VSQUOTE, subtype, flag);
|
|
if (subtype == VSLENGTH) {
|
|
varlen = expdest - stackblock() - startloc;
|
|
STADJUST(-varlen, expdest);
|
|
}
|
|
} else {
|
|
char const *syntax = (varflags & VSQUOTE) ? DQSYNTAX
|
|
: BASESYNTAX;
|
|
|
|
if (subtype == VSLENGTH) {
|
|
for (;*val; val++)
|
|
varlen++;
|
|
}
|
|
else {
|
|
if (quotes)
|
|
STPUTS_QUOTES(val, syntax, expdest);
|
|
else
|
|
STPUTS(val, expdest);
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
if (subtype == VSPLUS)
|
|
set = ! set;
|
|
|
|
easy = ((varflags & VSQUOTE) == 0 ||
|
|
(*var == '@' && shellparam.nparam != 1));
|
|
|
|
|
|
switch (subtype) {
|
|
case VSLENGTH:
|
|
expdest = cvtnum(varlen, expdest);
|
|
goto record;
|
|
|
|
case VSNORMAL:
|
|
if (!easy)
|
|
break;
|
|
record:
|
|
recordregion(startloc, expdest - stackblock(),
|
|
varflags & VSQUOTE);
|
|
break;
|
|
|
|
case VSPLUS:
|
|
case VSMINUS:
|
|
if (!set) {
|
|
argstr(p, flag | (flag & EXP_FULL ? EXP_SPLIT_LIT : 0) |
|
|
(varflags & VSQUOTE ? EXP_LIT_QUOTED : 0));
|
|
break;
|
|
}
|
|
if (easy)
|
|
goto record;
|
|
break;
|
|
|
|
case VSTRIMLEFT:
|
|
case VSTRIMLEFTMAX:
|
|
case VSTRIMRIGHT:
|
|
case VSTRIMRIGHTMAX:
|
|
if (!set)
|
|
break;
|
|
/*
|
|
* Terminate the string and start recording the pattern
|
|
* right after it
|
|
*/
|
|
STPUTC('\0', expdest);
|
|
patloc = expdest - stackblock();
|
|
if (subevalvar(p, NULL, patloc, subtype,
|
|
startloc, varflags, quotes) == 0) {
|
|
int amount = (expdest - stackblock() - patloc) + 1;
|
|
STADJUST(-amount, expdest);
|
|
}
|
|
/* Remove any recorded regions beyond start of variable */
|
|
removerecordregions(startloc);
|
|
goto record;
|
|
|
|
case VSASSIGN:
|
|
case VSQUESTION:
|
|
if (!set) {
|
|
if (subevalvar(p, var, 0, subtype, startloc, varflags,
|
|
quotes)) {
|
|
varflags &= ~VSNUL;
|
|
/*
|
|
* Remove any recorded regions beyond
|
|
* start of variable
|
|
*/
|
|
removerecordregions(startloc);
|
|
goto again;
|
|
}
|
|
break;
|
|
}
|
|
if (easy)
|
|
goto record;
|
|
break;
|
|
|
|
case VSERROR:
|
|
c = p - var - 1;
|
|
error("${%.*s%s}: Bad substitution", c, var,
|
|
(c > 0 && *p != CTLENDVAR) ? "..." : "");
|
|
|
|
default:
|
|
abort();
|
|
}
|
|
p[-1] = '='; /* recover overwritten '=' */
|
|
|
|
if (subtype != VSNORMAL) { /* skip to end of alternative */
|
|
int nesting = 1;
|
|
for (;;) {
|
|
if ((c = *p++) == CTLESC)
|
|
p++;
|
|
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
|
|
if (set)
|
|
argbackq = argbackq->next;
|
|
} else if (c == CTLVAR) {
|
|
if ((*p++ & VSTYPE) != VSNORMAL)
|
|
nesting++;
|
|
} else if (c == CTLENDVAR) {
|
|
if (--nesting == 0)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Test whether a specialized variable is set.
|
|
*/
|
|
|
|
static int
|
|
varisset(char *name, int nulok)
|
|
{
|
|
|
|
if (*name == '!')
|
|
return backgndpidset();
|
|
else if (*name == '@' || *name == '*') {
|
|
if (*shellparam.p == NULL)
|
|
return 0;
|
|
|
|
if (nulok) {
|
|
char **av;
|
|
|
|
for (av = shellparam.p; *av; av++)
|
|
if (**av != '\0')
|
|
return 1;
|
|
return 0;
|
|
}
|
|
} else if (is_digit(*name)) {
|
|
char *ap;
|
|
int num = atoi(name);
|
|
|
|
if (num > shellparam.nparam)
|
|
return 0;
|
|
|
|
if (num == 0)
|
|
ap = arg0;
|
|
else
|
|
ap = shellparam.p[num - 1];
|
|
|
|
if (nulok && (ap == NULL || *ap == '\0'))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
strtodest(const char *p, int flag, int subtype, int quoted)
|
|
{
|
|
if (flag & (EXP_FULL | EXP_CASE) && subtype != VSLENGTH)
|
|
STPUTS_QUOTES(p, quoted ? DQSYNTAX : BASESYNTAX, expdest);
|
|
else
|
|
STPUTS(p, expdest);
|
|
}
|
|
|
|
/*
|
|
* Add the value of a specialized variable to the stack string.
|
|
*/
|
|
|
|
static void
|
|
varvalue(char *name, int quoted, int subtype, int flag)
|
|
{
|
|
int num;
|
|
char *p;
|
|
int i;
|
|
char sep;
|
|
char **ap;
|
|
|
|
switch (*name) {
|
|
case '$':
|
|
num = rootpid;
|
|
goto numvar;
|
|
case '?':
|
|
num = oexitstatus;
|
|
goto numvar;
|
|
case '#':
|
|
num = shellparam.nparam;
|
|
goto numvar;
|
|
case '!':
|
|
num = backgndpidval();
|
|
numvar:
|
|
expdest = cvtnum(num, expdest);
|
|
break;
|
|
case '-':
|
|
for (i = 0 ; i < NOPTS ; i++) {
|
|
if (optlist[i].val)
|
|
STPUTC(optlist[i].letter, expdest);
|
|
}
|
|
break;
|
|
case '@':
|
|
if (flag & EXP_FULL && quoted) {
|
|
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
|
|
strtodest(p, flag, subtype, quoted);
|
|
if (*ap)
|
|
STPUTC('\0', expdest);
|
|
}
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case '*':
|
|
if (ifsset())
|
|
sep = ifsval()[0];
|
|
else
|
|
sep = ' ';
|
|
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
|
|
strtodest(p, flag, subtype, quoted);
|
|
if (*ap && sep)
|
|
STPUTC(sep, expdest);
|
|
}
|
|
break;
|
|
case '0':
|
|
p = arg0;
|
|
strtodest(p, flag, subtype, quoted);
|
|
break;
|
|
default:
|
|
if (is_digit(*name)) {
|
|
num = atoi(name);
|
|
if (num > 0 && num <= shellparam.nparam) {
|
|
p = shellparam.p[num - 1];
|
|
strtodest(p, flag, subtype, quoted);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Record the fact that we have to scan this region of the
|
|
* string for IFS characters.
|
|
*/
|
|
|
|
static void
|
|
recordregion(int start, int end, int inquotes)
|
|
{
|
|
struct ifsregion *ifsp;
|
|
|
|
if (ifslastp == NULL) {
|
|
ifsp = &ifsfirst;
|
|
} else {
|
|
if (ifslastp->endoff == start
|
|
&& ifslastp->inquotes == inquotes) {
|
|
/* extend previous area */
|
|
ifslastp->endoff = end;
|
|
return;
|
|
}
|
|
ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
|
|
ifslastp->next = ifsp;
|
|
}
|
|
ifslastp = ifsp;
|
|
ifslastp->next = NULL;
|
|
ifslastp->begoff = start;
|
|
ifslastp->endoff = end;
|
|
ifslastp->inquotes = inquotes;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Break the argument string into pieces based upon IFS and add the
|
|
* strings to the argument list. The regions of the string to be
|
|
* searched for IFS characters have been stored by recordregion.
|
|
* CTLESC characters are preserved but have little effect in this pass
|
|
* other than escaping CTL* characters. In particular, they do not escape
|
|
* IFS characters: that should be done with the ifsregion mechanism.
|
|
* CTLQUOTEMARK characters are used to preserve empty quoted strings.
|
|
* This pass treats them as a regular character, making the string non-empty.
|
|
* Later, they are removed along with the other CTL* characters.
|
|
*/
|
|
static void
|
|
ifsbreakup(char *string, struct arglist *arglist)
|
|
{
|
|
struct ifsregion *ifsp;
|
|
struct strlist *sp;
|
|
char *start;
|
|
char *p;
|
|
char *q;
|
|
const char *ifs;
|
|
const char *ifsspc;
|
|
int had_param_ch = 0;
|
|
|
|
start = string;
|
|
|
|
if (ifslastp == NULL) {
|
|
/* Return entire argument, IFS doesn't apply to any of it */
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
return;
|
|
}
|
|
|
|
ifs = ifsset() ? ifsval() : " \t\n";
|
|
|
|
for (ifsp = &ifsfirst; ifsp != NULL; ifsp = ifsp->next) {
|
|
p = string + ifsp->begoff;
|
|
while (p < string + ifsp->endoff) {
|
|
q = p;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (ifsp->inquotes) {
|
|
/* Only NULs (should be from "$@") end args */
|
|
had_param_ch = 1;
|
|
if (*p != 0) {
|
|
p++;
|
|
continue;
|
|
}
|
|
ifsspc = NULL;
|
|
} else {
|
|
if (!strchr(ifs, *p)) {
|
|
had_param_ch = 1;
|
|
p++;
|
|
continue;
|
|
}
|
|
ifsspc = strchr(" \t\n", *p);
|
|
|
|
/* Ignore IFS whitespace at start */
|
|
if (q == start && ifsspc != NULL) {
|
|
p++;
|
|
start = p;
|
|
continue;
|
|
}
|
|
had_param_ch = 0;
|
|
}
|
|
|
|
/* Save this argument... */
|
|
*q = '\0';
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
p++;
|
|
|
|
if (ifsspc != NULL) {
|
|
/* Ignore further trailing IFS whitespace */
|
|
for (; p < string + ifsp->endoff; p++) {
|
|
q = p;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (strchr(ifs, *p) == NULL) {
|
|
p = q;
|
|
break;
|
|
}
|
|
if (strchr(" \t\n", *p) == NULL) {
|
|
p++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
start = p;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Save anything left as an argument.
|
|
* Traditionally we have treated 'IFS=':'; set -- x$IFS' as
|
|
* generating 2 arguments, the second of which is empty.
|
|
* Some recent clarification of the Posix spec say that it
|
|
* should only generate one....
|
|
*/
|
|
if (had_param_ch || *start != 0) {
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
}
|
|
}
|
|
|
|
|
|
static char expdir[PATH_MAX];
|
|
#define expdir_end (expdir + sizeof(expdir))
|
|
|
|
/*
|
|
* Perform pathname generation and remove control characters.
|
|
* At this point, the only control characters should be CTLESC and CTLQUOTEMARK.
|
|
* The results are stored in the list exparg.
|
|
*/
|
|
static void
|
|
expandmeta(struct strlist *str, int flag __unused)
|
|
{
|
|
char *p;
|
|
struct strlist **savelastp;
|
|
struct strlist *sp;
|
|
char c;
|
|
/* TODO - EXP_REDIR */
|
|
|
|
while (str) {
|
|
if (fflag)
|
|
goto nometa;
|
|
p = str->text;
|
|
for (;;) { /* fast check for meta chars */
|
|
if ((c = *p++) == '\0')
|
|
goto nometa;
|
|
if (c == '*' || c == '?' || c == '[')
|
|
break;
|
|
}
|
|
savelastp = exparg.lastp;
|
|
INTOFF;
|
|
expmeta(expdir, str->text);
|
|
INTON;
|
|
if (exparg.lastp == savelastp) {
|
|
/*
|
|
* no matches
|
|
*/
|
|
nometa:
|
|
*exparg.lastp = str;
|
|
rmescapes(str->text);
|
|
exparg.lastp = &str->next;
|
|
} else {
|
|
*exparg.lastp = NULL;
|
|
*savelastp = sp = expsort(*savelastp);
|
|
while (sp->next != NULL)
|
|
sp = sp->next;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
str = str->next;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Do metacharacter (i.e. *, ?, [...]) expansion.
|
|
*/
|
|
|
|
static void
|
|
expmeta(char *enddir, char *name)
|
|
{
|
|
char *p;
|
|
char *q;
|
|
char *start;
|
|
char *endname;
|
|
int metaflag;
|
|
struct stat statb;
|
|
DIR *dirp;
|
|
struct dirent *dp;
|
|
int atend;
|
|
int matchdot;
|
|
int esc;
|
|
|
|
metaflag = 0;
|
|
start = name;
|
|
for (p = name; esc = 0, *p; p += esc + 1) {
|
|
if (*p == '*' || *p == '?')
|
|
metaflag = 1;
|
|
else if (*p == '[') {
|
|
q = p + 1;
|
|
if (*q == '!' || *q == '^')
|
|
q++;
|
|
for (;;) {
|
|
while (*q == CTLQUOTEMARK)
|
|
q++;
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (*q == '/' || *q == '\0')
|
|
break;
|
|
if (*++q == ']') {
|
|
metaflag = 1;
|
|
break;
|
|
}
|
|
}
|
|
} else if (*p == '\0')
|
|
break;
|
|
else if (*p == CTLQUOTEMARK)
|
|
continue;
|
|
else {
|
|
if (*p == CTLESC)
|
|
esc++;
|
|
if (p[esc] == '/') {
|
|
if (metaflag)
|
|
break;
|
|
start = p + esc + 1;
|
|
}
|
|
}
|
|
}
|
|
if (metaflag == 0) { /* we've reached the end of the file name */
|
|
if (enddir != expdir)
|
|
metaflag++;
|
|
for (p = name ; ; p++) {
|
|
if (*p == CTLQUOTEMARK)
|
|
continue;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*enddir++ = *p;
|
|
if (*p == '\0')
|
|
break;
|
|
if (enddir == expdir_end)
|
|
return;
|
|
}
|
|
if (metaflag == 0 || lstat(expdir, &statb) >= 0)
|
|
addfname(expdir);
|
|
return;
|
|
}
|
|
endname = p;
|
|
if (start != name) {
|
|
p = name;
|
|
while (p < start) {
|
|
while (*p == CTLQUOTEMARK)
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*enddir++ = *p++;
|
|
if (enddir == expdir_end)
|
|
return;
|
|
}
|
|
}
|
|
if (enddir == expdir) {
|
|
p = ".";
|
|
} else if (enddir == expdir + 1 && *expdir == '/') {
|
|
p = "/";
|
|
} else {
|
|
p = expdir;
|
|
enddir[-1] = '\0';
|
|
}
|
|
if ((dirp = opendir(p)) == NULL)
|
|
return;
|
|
if (enddir != expdir)
|
|
enddir[-1] = '/';
|
|
if (*endname == 0) {
|
|
atend = 1;
|
|
} else {
|
|
atend = 0;
|
|
*endname = '\0';
|
|
endname += esc + 1;
|
|
}
|
|
matchdot = 0;
|
|
p = start;
|
|
while (*p == CTLQUOTEMARK)
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (*p == '.')
|
|
matchdot++;
|
|
while (! int_pending() && (dp = readdir(dirp)) != NULL) {
|
|
if (dp->d_name[0] == '.' && ! matchdot)
|
|
continue;
|
|
if (patmatch(start, dp->d_name, 0)) {
|
|
if (enddir + dp->d_namlen + 1 > expdir_end)
|
|
continue;
|
|
memcpy(enddir, dp->d_name, dp->d_namlen + 1);
|
|
if (atend)
|
|
addfname(expdir);
|
|
else {
|
|
if (enddir + dp->d_namlen + 2 > expdir_end)
|
|
continue;
|
|
enddir[dp->d_namlen] = '/';
|
|
enddir[dp->d_namlen + 1] = '\0';
|
|
expmeta(enddir + dp->d_namlen + 1, endname);
|
|
}
|
|
}
|
|
}
|
|
closedir(dirp);
|
|
if (! atend)
|
|
endname[-esc - 1] = esc ? CTLESC : '/';
|
|
}
|
|
|
|
|
|
/*
|
|
* Add a file name to the list.
|
|
*/
|
|
|
|
static void
|
|
addfname(char *name)
|
|
{
|
|
char *p;
|
|
struct strlist *sp;
|
|
|
|
p = stalloc(strlen(name) + 1);
|
|
scopy(name, p);
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = p;
|
|
*exparg.lastp = sp;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
|
|
|
|
/*
|
|
* Sort the results of file name expansion. It calculates the number of
|
|
* strings to sort and then calls msort (short for merge sort) to do the
|
|
* work.
|
|
*/
|
|
|
|
static struct strlist *
|
|
expsort(struct strlist *str)
|
|
{
|
|
int len;
|
|
struct strlist *sp;
|
|
|
|
len = 0;
|
|
for (sp = str ; sp ; sp = sp->next)
|
|
len++;
|
|
return msort(str, len);
|
|
}
|
|
|
|
|
|
static struct strlist *
|
|
msort(struct strlist *list, int len)
|
|
{
|
|
struct strlist *p, *q = NULL;
|
|
struct strlist **lpp;
|
|
int half;
|
|
int n;
|
|
|
|
if (len <= 1)
|
|
return list;
|
|
half = len >> 1;
|
|
p = list;
|
|
for (n = half ; --n >= 0 ; ) {
|
|
q = p;
|
|
p = p->next;
|
|
}
|
|
q->next = NULL; /* terminate first half of list */
|
|
q = msort(list, half); /* sort first half of list */
|
|
p = msort(p, len - half); /* sort second half */
|
|
lpp = &list;
|
|
for (;;) {
|
|
if (strcmp(p->text, q->text) < 0) {
|
|
*lpp = p;
|
|
lpp = &p->next;
|
|
if ((p = *lpp) == NULL) {
|
|
*lpp = q;
|
|
break;
|
|
}
|
|
} else {
|
|
*lpp = q;
|
|
lpp = &q->next;
|
|
if ((q = *lpp) == NULL) {
|
|
*lpp = p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return list;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Returns true if the pattern matches the string.
|
|
*/
|
|
|
|
int
|
|
patmatch(const char *pattern, const char *string, int squoted)
|
|
{
|
|
const char *p, *q;
|
|
char c;
|
|
|
|
p = pattern;
|
|
q = string;
|
|
for (;;) {
|
|
switch (c = *p++) {
|
|
case '\0':
|
|
goto breakloop;
|
|
case CTLESC:
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
if (*q++ != *p++)
|
|
return 0;
|
|
break;
|
|
case CTLQUOTEMARK:
|
|
continue;
|
|
case '?':
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
if (*q++ == '\0')
|
|
return 0;
|
|
break;
|
|
case '*':
|
|
c = *p;
|
|
while (c == CTLQUOTEMARK || c == '*')
|
|
c = *++p;
|
|
if (c != CTLESC && c != CTLQUOTEMARK &&
|
|
c != '?' && c != '*' && c != '[') {
|
|
while (*q != c) {
|
|
if (squoted && *q == CTLESC &&
|
|
q[1] == c)
|
|
break;
|
|
if (*q == '\0')
|
|
return 0;
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
q++;
|
|
}
|
|
}
|
|
do {
|
|
if (patmatch(p, q, squoted))
|
|
return 1;
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
} while (*q++ != '\0');
|
|
return 0;
|
|
case '[': {
|
|
const char *endp;
|
|
int invert, found;
|
|
char chr;
|
|
|
|
endp = p;
|
|
if (*endp == '!' || *endp == '^')
|
|
endp++;
|
|
for (;;) {
|
|
while (*endp == CTLQUOTEMARK)
|
|
endp++;
|
|
if (*endp == '\0')
|
|
goto dft; /* no matching ] */
|
|
if (*endp == CTLESC)
|
|
endp++;
|
|
if (*++endp == ']')
|
|
break;
|
|
}
|
|
invert = 0;
|
|
if (*p == '!' || *p == '^') {
|
|
invert++;
|
|
p++;
|
|
}
|
|
found = 0;
|
|
chr = *q++;
|
|
if (squoted && chr == CTLESC)
|
|
chr = *q++;
|
|
if (chr == '\0')
|
|
return 0;
|
|
c = *p++;
|
|
do {
|
|
if (c == CTLQUOTEMARK)
|
|
continue;
|
|
if (c == CTLESC)
|
|
c = *p++;
|
|
if (*p == '-' && p[1] != ']') {
|
|
p++;
|
|
while (*p == CTLQUOTEMARK)
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if ( collate_range_cmp(chr, c) >= 0
|
|
&& collate_range_cmp(chr, *p) <= 0
|
|
)
|
|
found = 1;
|
|
p++;
|
|
} else {
|
|
if (chr == c)
|
|
found = 1;
|
|
}
|
|
} while ((c = *p++) != ']');
|
|
if (found == invert)
|
|
return 0;
|
|
break;
|
|
}
|
|
dft: default:
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
if (*q++ != c)
|
|
return 0;
|
|
break;
|
|
}
|
|
}
|
|
breakloop:
|
|
if (*q != '\0')
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Remove any CTLESC and CTLQUOTEMARK characters from a string.
|
|
*/
|
|
|
|
void
|
|
rmescapes(char *str)
|
|
{
|
|
char *p, *q;
|
|
|
|
p = str;
|
|
while (*p != CTLESC && *p != CTLQUOTEMARK && *p != CTLQUOTEEND) {
|
|
if (*p++ == '\0')
|
|
return;
|
|
}
|
|
q = p;
|
|
while (*p) {
|
|
if (*p == CTLQUOTEMARK || *p == CTLQUOTEEND) {
|
|
p++;
|
|
continue;
|
|
}
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* See if a pattern matches in a case statement.
|
|
*/
|
|
|
|
int
|
|
casematch(union node *pattern, const char *val)
|
|
{
|
|
struct stackmark smark;
|
|
int result;
|
|
char *p;
|
|
|
|
setstackmark(&smark);
|
|
argbackq = pattern->narg.backquote;
|
|
STARTSTACKSTR(expdest);
|
|
ifslastp = NULL;
|
|
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
|
|
STPUTC('\0', expdest);
|
|
p = grabstackstr(expdest);
|
|
result = patmatch(p, val, 0);
|
|
popstackmark(&smark);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Our own itoa().
|
|
*/
|
|
|
|
static char *
|
|
cvtnum(int num, char *buf)
|
|
{
|
|
char temp[32];
|
|
int neg = num < 0;
|
|
char *p = temp + 31;
|
|
|
|
temp[31] = '\0';
|
|
|
|
do {
|
|
*--p = num % 10 + '0';
|
|
} while ((num /= 10) != 0);
|
|
|
|
if (neg)
|
|
*--p = '-';
|
|
|
|
STPUTS(p, buf);
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* Check statically if expanding a string may have side effects.
|
|
*/
|
|
int
|
|
expandhassideeffects(const char *p)
|
|
{
|
|
int c;
|
|
int arinest;
|
|
|
|
arinest = 0;
|
|
while ((c = *p++) != '\0') {
|
|
switch (c) {
|
|
case CTLESC:
|
|
p++;
|
|
break;
|
|
case CTLVAR:
|
|
c = *p++;
|
|
/* Expanding $! sets the job to remembered. */
|
|
if (*p == '!')
|
|
return 1;
|
|
if ((c & VSTYPE) == VSASSIGN)
|
|
return 1;
|
|
/*
|
|
* If we are in arithmetic, the parameter may contain
|
|
* '=' which may cause side effects. Exceptions are
|
|
* the length of a parameter and $$, $# and $? which
|
|
* are always numeric.
|
|
*/
|
|
if ((c & VSTYPE) == VSLENGTH) {
|
|
while (*p != '=')
|
|
p++;
|
|
p++;
|
|
break;
|
|
}
|
|
if ((*p == '$' || *p == '#' || *p == '?') &&
|
|
p[1] == '=') {
|
|
p += 2;
|
|
break;
|
|
}
|
|
if (arinest > 0)
|
|
return 1;
|
|
break;
|
|
case CTLBACKQ:
|
|
case CTLBACKQ | CTLQUOTE:
|
|
if (arinest > 0)
|
|
return 1;
|
|
break;
|
|
case CTLARI:
|
|
arinest++;
|
|
break;
|
|
case CTLENDARI:
|
|
arinest--;
|
|
break;
|
|
case '=':
|
|
if (*p == '=') {
|
|
/* Allow '==' operator. */
|
|
p++;
|
|
continue;
|
|
}
|
|
if (arinest > 0)
|
|
return 1;
|
|
break;
|
|
case '!': case '<': case '>':
|
|
/* Allow '!=', '<=', '>=' operators. */
|
|
if (*p == '=')
|
|
p++;
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Do most of the work for wordexp(3).
|
|
*/
|
|
|
|
int
|
|
wordexpcmd(int argc, char **argv)
|
|
{
|
|
size_t len;
|
|
int i;
|
|
|
|
out1fmt("%08x", argc - 1);
|
|
for (i = 1, len = 0; i < argc; i++)
|
|
len += strlen(argv[i]);
|
|
out1fmt("%08x", (int)len);
|
|
for (i = 1; i < argc; i++)
|
|
outbin(argv[i], strlen(argv[i]) + 1, out1);
|
|
return (0);
|
|
}
|