836 lines
16 KiB
C
836 lines
16 KiB
C
/* $NetBSD: var.c,v 1.40 2011/06/18 21:18:46 christos Exp $ */
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/*-
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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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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. 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[] = "@(#)var.c 8.3 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: var.c,v 1.40 2011/06/18 21:18:46 christos Exp $");
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#endif
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#endif /* not lint */
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#include <unistd.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <paths.h>
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/*
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* Shell variables.
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*/
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#include "shell.h"
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#include "output.h"
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#include "expand.h"
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#include "nodes.h" /* for other headers */
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#include "eval.h" /* defines cmdenviron */
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#include "exec.h"
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#include "syntax.h"
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#include "options.h"
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#include "builtins.h"
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#include "mail.h"
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#include "var.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 "parser.h"
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#include "show.h"
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#ifndef SMALL
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#include "myhistedit.h"
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#endif
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#ifdef SMALL
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#define VTABSIZE 39
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#else
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#define VTABSIZE 517
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#endif
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struct varinit {
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struct var *var;
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int flags;
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const char *text;
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void (*func)(const char *);
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};
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struct localvar *localvars;
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#if ATTY
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struct var vatty;
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#endif
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#ifndef SMALL
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struct var vhistsize;
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struct var vterm;
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#endif
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struct var vifs;
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struct var vmail;
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struct var vmpath;
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struct var vpath;
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struct var vps1;
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struct var vps2;
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struct var vps4;
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struct var vvers;
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struct var voptind;
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const struct varinit varinit[] = {
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#if ATTY
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{ &vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY=",
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NULL },
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#endif
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#ifndef SMALL
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{ &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=",
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sethistsize },
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#endif
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{ &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n",
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NULL },
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{ &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
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NULL },
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{ &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
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NULL },
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{ &vpath, VSTRFIXED|VTEXTFIXED, "PATH=" _PATH_DEFPATH,
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changepath },
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/*
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* vps1 depends on uid
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*/
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{ &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
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NULL },
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{ &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ",
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NULL },
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#ifndef SMALL
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{ &vterm, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM=",
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setterm },
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#endif
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{ &voptind, VSTRFIXED|VTEXTFIXED|VNOFUNC, "OPTIND=1",
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getoptsreset },
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{ NULL, 0, NULL,
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NULL }
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};
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struct var *vartab[VTABSIZE];
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STATIC int strequal(const char *, const char *);
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STATIC struct var *find_var(const char *, struct var ***, int *);
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/*
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* Initialize the varable symbol tables and import the environment
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*/
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#ifdef mkinit
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INCLUDE "var.h"
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MKINIT char **environ;
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INIT {
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char **envp;
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initvar();
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for (envp = environ ; *envp ; envp++) {
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if (strchr(*envp, '=')) {
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setvareq(*envp, VEXPORT|VTEXTFIXED);
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}
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}
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}
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#endif
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/*
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* This routine initializes the builtin variables. It is called when the
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* shell is initialized and again when a shell procedure is spawned.
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*/
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void
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initvar(void)
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{
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const struct varinit *ip;
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struct var *vp;
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struct var **vpp;
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for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
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if (find_var(ip->text, &vpp, &vp->name_len) != NULL)
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continue;
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vp->next = *vpp;
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*vpp = vp;
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vp->text = strdup(ip->text);
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vp->flags = ip->flags;
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vp->func = ip->func;
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}
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/*
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* PS1 depends on uid
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*/
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if (find_var("PS1", &vpp, &vps1.name_len) == NULL) {
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vps1.next = *vpp;
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*vpp = &vps1;
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vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
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vps1.flags = VSTRFIXED|VTEXTFIXED;
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}
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}
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/*
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* Safe version of setvar, returns 1 on success 0 on failure.
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*/
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int
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setvarsafe(const char *name, const char *val, int flags)
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{
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struct jmploc jmploc;
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struct jmploc *volatile savehandler = handler;
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int volatile err = 0;
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if (setjmp(jmploc.loc))
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err = 1;
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else {
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handler = &jmploc;
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setvar(name, val, flags);
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}
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handler = savehandler;
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return err;
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}
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/*
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* Set the value of a variable. The flags argument is ored with the
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* flags of the variable. If val is NULL, the variable is unset.
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*/
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void
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setvar(const char *name, const char *val, int flags)
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{
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const char *p;
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const char *q;
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char *d;
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int len;
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int namelen;
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char *nameeq;
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int isbad;
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isbad = 0;
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p = name;
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if (! is_name(*p))
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isbad = 1;
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p++;
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for (;;) {
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if (! is_in_name(*p)) {
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if (*p == '\0' || *p == '=')
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break;
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isbad = 1;
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}
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p++;
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}
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namelen = p - name;
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if (isbad)
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error("%.*s: bad variable name", namelen, name);
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len = namelen + 2; /* 2 is space for '=' and '\0' */
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if (val == NULL) {
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flags |= VUNSET;
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} else {
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len += strlen(val);
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}
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d = nameeq = ckmalloc(len);
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q = name;
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while (--namelen >= 0)
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*d++ = *q++;
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*d++ = '=';
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*d = '\0';
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if (val)
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scopy(val, d);
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setvareq(nameeq, flags);
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}
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/*
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* Same as setvar except that the variable and value are passed in
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* the first argument as name=value. Since the first argument will
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* be actually stored in the table, it should not be a string that
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* will go away.
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*/
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void
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setvareq(char *s, int flags)
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{
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struct var *vp, **vpp;
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int nlen;
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if (aflag)
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flags |= VEXPORT;
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vp = find_var(s, &vpp, &nlen);
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if (vp != NULL) {
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if (vp->flags & VREADONLY)
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error("%.*s: is read only", vp->name_len, s);
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if (flags & VNOSET)
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return;
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INTOFF;
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if (vp->func && (flags & VNOFUNC) == 0)
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(*vp->func)(s + vp->name_len + 1);
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if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
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ckfree(vp->text);
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vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
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vp->flags |= flags & ~VNOFUNC;
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vp->text = s;
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/*
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* We could roll this to a function, to handle it as
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* a regular variable function callback, but why bother?
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*/
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if (vp == &vmpath || (vp == &vmail && ! mpathset()))
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chkmail(1);
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INTON;
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return;
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}
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/* not found */
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if (flags & VNOSET)
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return;
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vp = ckmalloc(sizeof (*vp));
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vp->flags = flags & ~VNOFUNC;
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vp->text = s;
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vp->name_len = nlen;
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vp->next = *vpp;
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vp->func = NULL;
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*vpp = vp;
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}
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/*
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* Process a linked list of variable assignments.
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*/
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void
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listsetvar(struct strlist *list, int flags)
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{
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struct strlist *lp;
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INTOFF;
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for (lp = list ; lp ; lp = lp->next) {
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setvareq(savestr(lp->text), flags);
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}
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INTON;
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}
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void
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listmklocal(struct strlist *list, int flags)
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{
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struct strlist *lp;
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for (lp = list ; lp ; lp = lp->next)
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mklocal(lp->text, flags);
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}
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/*
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* Find the value of a variable. Returns NULL if not set.
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*/
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char *
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lookupvar(const char *name)
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{
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struct var *v;
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v = find_var(name, NULL, NULL);
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if (v == NULL || v->flags & VUNSET)
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return NULL;
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return v->text + v->name_len + 1;
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}
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/*
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* Search the environment of a builtin command. If the second argument
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* is nonzero, return the value of a variable even if it hasn't been
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* exported.
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*/
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char *
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bltinlookup(const char *name, int doall)
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{
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struct strlist *sp;
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struct var *v;
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for (sp = cmdenviron ; sp ; sp = sp->next) {
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if (strequal(sp->text, name))
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return strchr(sp->text, '=') + 1;
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}
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v = find_var(name, NULL, NULL);
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if (v == NULL || v->flags & VUNSET || (!doall && !(v->flags & VEXPORT)))
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return NULL;
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return v->text + v->name_len + 1;
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}
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/*
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* Generate a list of exported variables. This routine is used to construct
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* the third argument to execve when executing a program.
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*/
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char **
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environment(void)
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{
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int nenv;
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struct var **vpp;
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struct var *vp;
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char **env;
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char **ep;
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nenv = 0;
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for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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for (vp = *vpp ; vp ; vp = vp->next)
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if (vp->flags & VEXPORT)
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nenv++;
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}
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ep = env = stalloc((nenv + 1) * sizeof *env);
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for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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for (vp = *vpp ; vp ; vp = vp->next)
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if (vp->flags & VEXPORT)
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*ep++ = vp->text;
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}
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*ep = NULL;
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return env;
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}
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/*
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* Called when a shell procedure is invoked to clear out nonexported
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* variables. It is also necessary to reallocate variables of with
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* VSTACK set since these are currently allocated on the stack.
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*/
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#ifdef mkinit
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void shprocvar(void);
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SHELLPROC {
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shprocvar();
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}
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#endif
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void
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shprocvar(void)
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{
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struct var **vpp;
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struct var *vp, **prev;
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for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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for (prev = vpp ; (vp = *prev) != NULL ; ) {
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if ((vp->flags & VEXPORT) == 0) {
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*prev = vp->next;
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if ((vp->flags & VTEXTFIXED) == 0)
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ckfree(vp->text);
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if ((vp->flags & VSTRFIXED) == 0)
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ckfree(vp);
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} else {
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if (vp->flags & VSTACK) {
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vp->text = savestr(vp->text);
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vp->flags &=~ VSTACK;
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}
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prev = &vp->next;
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}
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}
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}
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initvar();
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}
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/*
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* Command to list all variables which are set. Currently this command
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* is invoked from the set command when the set command is called without
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* any variables.
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*/
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void
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print_quoted(const char *p)
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{
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const char *q;
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if (strcspn(p, "|&;<>()$`\\\"' \t\n*?[]#~=%") == strlen(p)) {
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out1fmt("%s", p);
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return;
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}
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while (*p) {
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if (*p == '\'') {
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out1fmt("\\'");
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p++;
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continue;
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}
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q = index(p, '\'');
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if (!q) {
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out1fmt("'%s'", p );
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return;
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}
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out1fmt("'%.*s'", (int)(q - p), p );
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p = q;
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}
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}
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static int
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sort_var(const void *v_v1, const void *v_v2)
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{
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const struct var * const *v1 = v_v1;
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const struct var * const *v2 = v_v2;
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/* XXX Will anyone notice we include the '=' of the shorter name? */
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return strcoll((*v1)->text, (*v2)->text);
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}
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|
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/*
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* POSIX requires that 'set' (but not export or readonly) output the
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* variables in lexicographic order - by the locale's collating order (sigh).
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* Maybe we could keep them in an ordered balanced binary tree
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* instead of hashed lists.
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* For now just roll 'em through qsort for printing...
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*/
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int
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showvars(const char *name, int flag, int show_value)
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{
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struct var **vpp;
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struct var *vp;
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const char *p;
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static struct var **list; /* static in case we are interrupted */
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static int list_len;
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int count = 0;
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if (!list) {
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list_len = 32;
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list = ckmalloc(list_len * sizeof *list);
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}
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for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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for (vp = *vpp ; vp ; vp = vp->next) {
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if (flag && !(vp->flags & flag))
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continue;
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if (vp->flags & VUNSET && !(show_value & 2))
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continue;
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if (count >= list_len) {
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list = ckrealloc(list,
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(list_len << 1) * sizeof *list);
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list_len <<= 1;
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}
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list[count++] = vp;
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}
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}
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qsort(list, count, sizeof *list, sort_var);
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for (vpp = list; count--; vpp++) {
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vp = *vpp;
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if (name)
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out1fmt("%s ", name);
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for (p = vp->text ; *p != '=' ; p++)
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out1c(*p);
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if (!(vp->flags & VUNSET) && show_value) {
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out1fmt("=");
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print_quoted(++p);
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}
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|
out1c('\n');
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}
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|
return 0;
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}
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/*
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|
* The export and readonly commands.
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|
*/
|
|
|
|
int
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|
exportcmd(int argc, char **argv)
|
|
{
|
|
struct var *vp;
|
|
char *name;
|
|
const char *p;
|
|
int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
|
|
int pflag;
|
|
|
|
pflag = nextopt("p") == 'p' ? 3 : 0;
|
|
if (argc <= 1 || pflag) {
|
|
showvars( pflag ? argv[0] : 0, flag, pflag );
|
|
return 0;
|
|
}
|
|
|
|
while ((name = *argptr++) != NULL) {
|
|
if ((p = strchr(name, '=')) != NULL) {
|
|
p++;
|
|
} else {
|
|
vp = find_var(name, NULL, NULL);
|
|
if (vp != NULL) {
|
|
vp->flags |= flag;
|
|
continue;
|
|
}
|
|
}
|
|
setvar(name, p, flag);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* The "local" command.
|
|
*/
|
|
|
|
int
|
|
localcmd(int argc, char **argv)
|
|
{
|
|
char *name;
|
|
|
|
if (! in_function())
|
|
error("Not in a function");
|
|
while ((name = *argptr++) != NULL) {
|
|
mklocal(name, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Make a variable a local variable. When a variable is made local, its
|
|
* value and flags are saved in a localvar structure. The saved values
|
|
* will be restored when the shell function returns. We handle the name
|
|
* "-" as a special case.
|
|
*/
|
|
|
|
void
|
|
mklocal(const char *name, int flags)
|
|
{
|
|
struct localvar *lvp;
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
|
|
INTOFF;
|
|
lvp = ckmalloc(sizeof (struct localvar));
|
|
if (name[0] == '-' && name[1] == '\0') {
|
|
char *p;
|
|
p = ckmalloc(sizeof_optlist);
|
|
lvp->text = memcpy(p, optlist, sizeof_optlist);
|
|
vp = NULL;
|
|
} else {
|
|
vp = find_var(name, &vpp, NULL);
|
|
if (vp == NULL) {
|
|
if (strchr(name, '='))
|
|
setvareq(savestr(name), VSTRFIXED|flags);
|
|
else
|
|
setvar(name, NULL, VSTRFIXED|flags);
|
|
vp = *vpp; /* the new variable */
|
|
lvp->text = NULL;
|
|
lvp->flags = VUNSET;
|
|
} else {
|
|
lvp->text = vp->text;
|
|
lvp->flags = vp->flags;
|
|
vp->flags |= VSTRFIXED|VTEXTFIXED;
|
|
if (name[vp->name_len] == '=')
|
|
setvareq(savestr(name), flags);
|
|
}
|
|
}
|
|
lvp->vp = vp;
|
|
lvp->next = localvars;
|
|
localvars = lvp;
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called after a function returns.
|
|
*/
|
|
|
|
void
|
|
poplocalvars(void)
|
|
{
|
|
struct localvar *lvp;
|
|
struct var *vp;
|
|
|
|
while ((lvp = localvars) != NULL) {
|
|
localvars = lvp->next;
|
|
vp = lvp->vp;
|
|
TRACE(("poplocalvar %s", vp ? vp->text : "-"));
|
|
if (vp == NULL) { /* $- saved */
|
|
memcpy(optlist, lvp->text, sizeof_optlist);
|
|
ckfree(lvp->text);
|
|
} else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
|
|
(void)unsetvar(vp->text, 0);
|
|
} else {
|
|
if (vp->func && (vp->flags & VNOFUNC) == 0)
|
|
(*vp->func)(lvp->text + vp->name_len + 1);
|
|
if ((vp->flags & VTEXTFIXED) == 0)
|
|
ckfree(vp->text);
|
|
vp->flags = lvp->flags;
|
|
vp->text = lvp->text;
|
|
}
|
|
ckfree(lvp);
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
setvarcmd(int argc, char **argv)
|
|
{
|
|
if (argc <= 2)
|
|
return unsetcmd(argc, argv);
|
|
else if (argc == 3)
|
|
setvar(argv[1], argv[2], 0);
|
|
else
|
|
error("List assignment not implemented");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* The unset builtin command. We unset the function before we unset the
|
|
* variable to allow a function to be unset when there is a readonly variable
|
|
* with the same name.
|
|
*/
|
|
|
|
int
|
|
unsetcmd(int argc, char **argv)
|
|
{
|
|
char **ap;
|
|
int i;
|
|
int flg_func = 0;
|
|
int flg_var = 0;
|
|
int ret = 0;
|
|
|
|
while ((i = nextopt("evf")) != '\0') {
|
|
if (i == 'f')
|
|
flg_func = 1;
|
|
else
|
|
flg_var = i;
|
|
}
|
|
if (flg_func == 0 && flg_var == 0)
|
|
flg_var = 1;
|
|
|
|
for (ap = argptr; *ap ; ap++) {
|
|
if (flg_func)
|
|
ret |= unsetfunc(*ap);
|
|
if (flg_var)
|
|
ret |= unsetvar(*ap, flg_var == 'e');
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Unset the specified variable.
|
|
*/
|
|
|
|
int
|
|
unsetvar(const char *s, int unexport)
|
|
{
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
|
|
vp = find_var(s, &vpp, NULL);
|
|
if (vp == NULL)
|
|
return 1;
|
|
|
|
if (vp->flags & VREADONLY)
|
|
return (1);
|
|
|
|
INTOFF;
|
|
if (unexport) {
|
|
vp->flags &= ~VEXPORT;
|
|
} else {
|
|
if (vp->text[vp->name_len + 1] != '\0')
|
|
setvar(s, nullstr, 0);
|
|
vp->flags &= ~VEXPORT;
|
|
vp->flags |= VUNSET;
|
|
if ((vp->flags & VSTRFIXED) == 0) {
|
|
if ((vp->flags & VTEXTFIXED) == 0)
|
|
ckfree(vp->text);
|
|
*vpp = vp->next;
|
|
ckfree(vp);
|
|
}
|
|
}
|
|
INTON;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Returns true if the two strings specify the same varable. The first
|
|
* variable name is terminated by '='; the second may be terminated by
|
|
* either '=' or '\0'.
|
|
*/
|
|
|
|
STATIC int
|
|
strequal(const char *p, const char *q)
|
|
{
|
|
while (*p == *q++) {
|
|
if (*p++ == '=')
|
|
return 1;
|
|
}
|
|
if (*p == '=' && *(q - 1) == '\0')
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Search for a variable.
|
|
* 'name' may be terminated by '=' or a NUL.
|
|
* vppp is set to the pointer to vp, or the list head if vp isn't found
|
|
* lenp is set to the number of charactets in 'name'
|
|
*/
|
|
|
|
STATIC struct var *
|
|
find_var(const char *name, struct var ***vppp, int *lenp)
|
|
{
|
|
unsigned int hashval;
|
|
int len;
|
|
struct var *vp, **vpp;
|
|
const char *p = name;
|
|
|
|
hashval = 0;
|
|
while (*p && *p != '=')
|
|
hashval = 2 * hashval + (unsigned char)*p++;
|
|
len = p - name;
|
|
|
|
if (lenp)
|
|
*lenp = len;
|
|
vpp = &vartab[hashval % VTABSIZE];
|
|
if (vppp)
|
|
*vppp = vpp;
|
|
|
|
for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
|
|
if (vp->name_len != len)
|
|
continue;
|
|
if (memcmp(vp->text, name, len) != 0)
|
|
continue;
|
|
if (vppp)
|
|
*vppp = vpp;
|
|
return vp;
|
|
}
|
|
return NULL;
|
|
}
|