| 1 | /* $NetBSD: var.c,v 1.36 2004/10/06 10:23:43 enami Exp $ */
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| 2 |
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| 3 | /*-
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| 4 | * Copyright (c) 1991, 1993
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| 5 | * The Regents of the University of California. All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to Berkeley by
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| 8 | * Kenneth Almquist.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | * 3. Neither the name of the University nor the names of its contributors
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| 19 | * may be used to endorse or promote products derived from this software
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| 20 | * without specific prior written permission.
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| 21 | *
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 32 | * SUCH DAMAGE.
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| 33 | */
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| 34 |
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| 35 | #include <sys/cdefs.h>
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| 36 | #ifndef lint
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| 37 | #if 0
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| 38 | static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95";
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| 39 | #else
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| 40 | __RCSID("$NetBSD: var.c,v 1.36 2004/10/06 10:23:43 enami Exp $");
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| 41 | #endif
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| 42 | #endif /* not lint */
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| 43 |
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| 44 | #include <unistd.h>
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| 45 | #include <stdlib.h>
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| 46 | #include <strings.h>
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| 47 | #include <paths.h>
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| 48 |
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| 49 | /*
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| 50 | * Shell variables.
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| 51 | */
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| 52 |
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| 53 | #include "shell.h"
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| 54 | #include "output.h"
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| 55 | #include "expand.h"
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| 56 | #include "nodes.h" /* for other headers */
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| 57 | #include "eval.h" /* defines cmdenviron */
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| 58 | #include "exec.h"
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| 59 | #include "syntax.h"
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| 60 | #include "options.h"
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| 61 | #include "mail.h"
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| 62 | #include "var.h"
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| 63 | #include "memalloc.h"
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| 64 | #include "error.h"
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| 65 | #include "mystring.h"
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| 66 | #include "parser.h"
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| 67 | #include "show.h"
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| 68 | #ifndef SMALL
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| 69 | #include "myhistedit.h"
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| 70 | #endif
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| 71 |
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| 72 | #ifdef SMALL
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| 73 | #define VTABSIZE 39
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| 74 | #else
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| 75 | #define VTABSIZE 517
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| 76 | #endif
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| 77 |
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| 78 |
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| 79 | struct varinit {
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| 80 | struct var *var;
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| 81 | int flags;
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| 82 | const char *text;
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| 83 | void (*func)(const char *);
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| 84 | };
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| 85 |
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| 86 |
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| 87 | #if ATTY
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| 88 | struct var vatty;
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| 89 | #endif
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| 90 | #ifndef SMALL
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| 91 | struct var vhistsize;
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| 92 | struct var vterm;
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| 93 | #endif
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| 94 | struct var vifs;
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| 95 | struct var vmail;
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| 96 | struct var vmpath;
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| 97 | struct var vpath;
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| 98 | struct var vps1;
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| 99 | struct var vps2;
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| 100 | struct var vps4;
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| 101 | struct var vvers;
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| 102 | struct var voptind;
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| 103 |
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| 104 | const struct varinit varinit[] = {
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| 105 | #if ATTY
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| 106 | { &vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY=",
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| 107 | NULL },
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| 108 | #endif
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| 109 | #ifndef SMALL
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| 110 | { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=",
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| 111 | sethistsize },
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| 112 | #endif
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| 113 | { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n",
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| 114 | NULL },
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| 115 | { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
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| 116 | NULL },
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| 117 | { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
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| 118 | NULL },
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| 119 | { &vpath, VSTRFIXED|VTEXTFIXED, "PATH=" _PATH_DEFPATH,
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| 120 | changepath },
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| 121 | /*
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| 122 | * vps1 depends on uid
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| 123 | */
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| 124 | { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
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| 125 | NULL },
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| 126 | { &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ",
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| 127 | NULL },
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| 128 | #ifndef SMALL
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| 129 | { &vterm, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM=",
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| 130 | setterm },
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| 131 | #endif
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| 132 | { &voptind, VSTRFIXED|VTEXTFIXED|VNOFUNC, "OPTIND=1",
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| 133 | getoptsreset },
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| 134 | { NULL, 0, NULL,
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| 135 | NULL }
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| 136 | };
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| 137 |
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| 138 | struct var *vartab[VTABSIZE];
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| 139 |
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| 140 | STATIC int strequal(const char *, const char *);
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| 141 | STATIC struct var *find_var(const char *, struct var ***, int *);
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| 142 |
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| 143 | /*
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| 144 | * Initialize the varable symbol tables and import the environment
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| 145 | */
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| 146 |
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| 147 | #ifdef mkinit
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| 148 | INCLUDE "var.h"
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| 149 | MKINIT char **environ;
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| 150 | INIT {
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| 151 | char **envp;
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| 152 |
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| 153 | initvar();
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| 154 | for (envp = environ ; *envp ; envp++) {
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| 155 | if (strchr(*envp, '=')) {
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| 156 | setvareq(*envp, VEXPORT|VTEXTFIXED);
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| 157 | }
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| 158 | }
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| 159 | }
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| 160 | #endif
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| 161 |
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| 162 |
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| 163 | /*
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| 164 | * This routine initializes the builtin variables. It is called when the
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| 165 | * shell is initialized and again when a shell procedure is spawned.
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| 166 | */
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| 167 |
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| 168 | void
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| 169 | initvar(void)
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| 170 | {
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| 171 | const struct varinit *ip;
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| 172 | struct var *vp;
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| 173 | struct var **vpp;
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| 174 |
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| 175 | for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
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| 176 | if (find_var(ip->text, &vpp, &vp->name_len) != NULL)
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| 177 | continue;
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| 178 | vp->next = *vpp;
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| 179 | *vpp = vp;
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| 180 | vp->text = strdup(ip->text);
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| 181 | vp->flags = ip->flags;
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| 182 | vp->func = ip->func;
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| 183 | }
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| 184 | /*
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| 185 | * PS1 depends on uid
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| 186 | */
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| 187 | if (find_var("PS1", &vpp, &vps1.name_len) == NULL) {
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| 188 | vps1.next = *vpp;
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| 189 | *vpp = &vps1;
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| 190 | vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
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| 191 | vps1.flags = VSTRFIXED|VTEXTFIXED;
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| 192 | }
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| 193 | }
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| 194 |
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| 195 | /*
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| 196 | * Safe version of setvar, returns 1 on success 0 on failure.
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| 197 | */
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| 198 |
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| 199 | int
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| 200 | setvarsafe(const char *name, const char *val, int flags)
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| 201 | {
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| 202 | struct jmploc jmploc;
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| 203 | struct jmploc *volatile savehandler = handler;
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| 204 | int err = 0;
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| 205 | #ifdef __GNUC__
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| 206 | (void) &err;
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| 207 | #endif
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| 208 |
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| 209 | if (setjmp(jmploc.loc))
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| 210 | err = 1;
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| 211 | else {
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| 212 | handler = &jmploc;
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| 213 | setvar(name, val, flags);
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| 214 | }
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| 215 | handler = savehandler;
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| 216 | return err;
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| 217 | }
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| 218 |
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| 219 | /*
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| 220 | * Set the value of a variable. The flags argument is ored with the
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| 221 | * flags of the variable. If val is NULL, the variable is unset.
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| 222 | */
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| 223 |
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| 224 | void
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| 225 | setvar(const char *name, const char *val, int flags)
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| 226 | {
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| 227 | const char *p;
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| 228 | const char *q;
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| 229 | char *d;
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| 230 | int len;
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| 231 | int namelen;
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| 232 | char *nameeq;
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| 233 | int isbad;
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| 234 |
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| 235 | isbad = 0;
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| 236 | p = name;
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| 237 | if (! is_name(*p))
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| 238 | isbad = 1;
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| 239 | p++;
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| 240 | for (;;) {
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| 241 | if (! is_in_name(*p)) {
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| 242 | if (*p == '\0' || *p == '=')
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| 243 | break;
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| 244 | isbad = 1;
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| 245 | }
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| 246 | p++;
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| 247 | }
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| 248 | namelen = p - name;
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| 249 | if (isbad)
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| 250 | error("%.*s: bad variable name", namelen, name);
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| 251 | len = namelen + 2; /* 2 is space for '=' and '\0' */
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| 252 | if (val == NULL) {
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| 253 | flags |= VUNSET;
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| 254 | } else {
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| 255 | len += strlen(val);
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| 256 | }
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| 257 | d = nameeq = ckmalloc(len);
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| 258 | q = name;
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| 259 | while (--namelen >= 0)
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| 260 | *d++ = *q++;
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| 261 | *d++ = '=';
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| 262 | *d = '\0';
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| 263 | if (val)
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| 264 | scopy(val, d);
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| 265 | setvareq(nameeq, flags);
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| 266 | }
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| 267 |
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| 268 |
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| 269 |
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| 270 | /*
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| 271 | * Same as setvar except that the variable and value are passed in
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| 272 | * the first argument as name=value. Since the first argument will
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| 273 | * be actually stored in the table, it should not be a string that
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| 274 | * will go away.
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| 275 | */
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| 276 |
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| 277 | void
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| 278 | setvareq(char *s, int flags)
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| 279 | {
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| 280 | struct var *vp, **vpp;
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| 281 | int nlen;
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| 282 |
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| 283 | if (aflag)
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| 284 | flags |= VEXPORT;
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| 285 | vp = find_var(s, &vpp, &nlen);
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| 286 | if (vp != NULL) {
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| 287 | if (vp->flags & VREADONLY)
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| 288 | error("%.*s: is read only", vp->name_len, s);
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| 289 | if (flags & VNOSET)
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| 290 | return;
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| 291 | INTOFF;
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| 292 |
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| 293 | if (vp->func && (flags & VNOFUNC) == 0)
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| 294 | (*vp->func)(s + vp->name_len + 1);
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| 295 |
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| 296 | if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
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| 297 | ckfree(vp->text);
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| 298 |
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| 299 | vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
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| 300 | vp->flags |= flags & ~VNOFUNC;
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| 301 | vp->text = s;
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| 302 |
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| 303 | /*
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| 304 | * We could roll this to a function, to handle it as
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| 305 | * a regular variable function callback, but why bother?
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| 306 | */
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| 307 | if (vp == &vmpath || (vp == &vmail && ! mpathset()))
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| 308 | chkmail(1);
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| 309 | INTON;
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| 310 | return;
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| 311 | }
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| 312 | /* not found */
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| 313 | if (flags & VNOSET)
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| 314 | return;
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| 315 | vp = ckmalloc(sizeof (*vp));
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| 316 | vp->flags = flags & ~VNOFUNC;
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| 317 | vp->text = s;
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| 318 | vp->name_len = nlen;
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| 319 | vp->next = *vpp;
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| 320 | vp->func = NULL;
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| 321 | *vpp = vp;
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| 322 | }
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| 323 |
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| 324 |
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| 325 |
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| 326 | /*
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| 327 | * Process a linked list of variable assignments.
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| 328 | */
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| 329 |
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| 330 | void
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| 331 | listsetvar(struct strlist *list, int flags)
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| 332 | {
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| 333 | struct strlist *lp;
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| 334 |
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| 335 | INTOFF;
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| 336 | for (lp = list ; lp ; lp = lp->next) {
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| 337 | setvareq(savestr(lp->text), flags);
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| 338 | }
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| 339 | INTON;
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| 340 | }
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| 341 |
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| 342 | void
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| 343 | listmklocal(struct strlist *list, int flags)
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| 344 | {
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| 345 | struct strlist *lp;
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| 346 |
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| 347 | for (lp = list ; lp ; lp = lp->next)
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| 348 | mklocal(lp->text, flags);
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| 349 | }
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| 350 |
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| 351 |
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| 352 | /*
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| 353 | * Find the value of a variable. Returns NULL if not set.
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| 354 | */
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| 355 |
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| 356 | char *
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| 357 | lookupvar(const char *name)
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| 358 | {
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| 359 | struct var *v;
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| 360 |
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| 361 | v = find_var(name, NULL, NULL);
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| 362 | if (v == NULL || v->flags & VUNSET)
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| 363 | return NULL;
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| 364 | return v->text + v->name_len + 1;
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| 365 | }
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| 366 |
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| 367 |
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| 368 |
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| 369 | /*
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| 370 | * Search the environment of a builtin command. If the second argument
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| 371 | * is nonzero, return the value of a variable even if it hasn't been
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| 372 | * exported.
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| 373 | */
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| 374 |
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| 375 | char *
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| 376 | bltinlookup(const char *name, int doall)
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| 377 | {
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| 378 | struct strlist *sp;
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| 379 | struct var *v;
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| 380 |
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| 381 | for (sp = cmdenviron ; sp ; sp = sp->next) {
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| 382 | if (strequal(sp->text, name))
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| 383 | return strchr(sp->text, '=') + 1;
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| 384 | }
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| 385 |
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| 386 | v = find_var(name, NULL, NULL);
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| 387 |
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| 388 | if (v == NULL || v->flags & VUNSET || (!doall && !(v->flags & VEXPORT)))
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| 389 | return NULL;
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| 390 | return v->text + v->name_len + 1;
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| 391 | }
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| 392 |
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| 393 |
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| 394 |
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| 395 | /*
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| 396 | * Generate a list of exported variables. This routine is used to construct
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| 397 | * the third argument to execve when executing a program.
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| 398 | */
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| 399 |
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| 400 | char **
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| 401 | environment(void)
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| 402 | {
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| 403 | int nenv;
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| 404 | struct var **vpp;
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| 405 | struct var *vp;
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| 406 | char **env;
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| 407 | char **ep;
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| 408 |
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| 409 | nenv = 0;
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| 410 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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| 411 | for (vp = *vpp ; vp ; vp = vp->next)
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| 412 | if (vp->flags & VEXPORT)
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| 413 | nenv++;
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| 414 | }
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| 415 | ep = env = stalloc((nenv + 1) * sizeof *env);
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| 416 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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| 417 | for (vp = *vpp ; vp ; vp = vp->next)
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| 418 | if (vp->flags & VEXPORT)
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| 419 | *ep++ = vp->text;
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| 420 | }
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| 421 | *ep = NULL;
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| 422 | return env;
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| 423 | }
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| 424 |
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| 425 |
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| 426 | /*
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| 427 | * Called when a shell procedure is invoked to clear out nonexported
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| 428 | * variables. It is also necessary to reallocate variables of with
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| 429 | * VSTACK set since these are currently allocated on the stack.
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| 430 | */
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| 431 |
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| 432 | #ifdef mkinit
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| 433 | void shprocvar(void);
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| 434 |
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| 435 | SHELLPROC {
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| 436 | shprocvar();
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| 437 | }
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| 438 | #endif
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| 439 |
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| 440 | void
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| 441 | shprocvar(void)
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| 442 | {
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| 443 | struct var **vpp;
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| 444 | struct var *vp, **prev;
|
|---|
| 445 |
|
|---|
| 446 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 447 | for (prev = vpp ; (vp = *prev) != NULL ; ) {
|
|---|
| 448 | if ((vp->flags & VEXPORT) == 0) {
|
|---|
| 449 | *prev = vp->next;
|
|---|
| 450 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 451 | ckfree(vp->text);
|
|---|
| 452 | if ((vp->flags & VSTRFIXED) == 0)
|
|---|
| 453 | ckfree(vp);
|
|---|
| 454 | } else {
|
|---|
| 455 | if (vp->flags & VSTACK) {
|
|---|
| 456 | vp->text = savestr(vp->text);
|
|---|
| 457 | vp->flags &=~ VSTACK;
|
|---|
| 458 | }
|
|---|
| 459 | prev = &vp->next;
|
|---|
| 460 | }
|
|---|
| 461 | }
|
|---|
| 462 | }
|
|---|
| 463 | initvar();
|
|---|
| 464 | }
|
|---|
| 465 |
|
|---|
| 466 |
|
|---|
| 467 |
|
|---|
| 468 | /*
|
|---|
| 469 | * Command to list all variables which are set. Currently this command
|
|---|
| 470 | * is invoked from the set command when the set command is called without
|
|---|
| 471 | * any variables.
|
|---|
| 472 | */
|
|---|
| 473 |
|
|---|
| 474 | void
|
|---|
| 475 | print_quoted(const char *p)
|
|---|
| 476 | {
|
|---|
| 477 | const char *q;
|
|---|
| 478 |
|
|---|
| 479 | if (strcspn(p, "|&;<>()$`\\\"' \t\n*?[]#~=%") == strlen(p)) {
|
|---|
| 480 | out1fmt("%s", p);
|
|---|
| 481 | return;
|
|---|
| 482 | }
|
|---|
| 483 | while (*p) {
|
|---|
| 484 | if (*p == '\'') {
|
|---|
| 485 | out1fmt("\\'");
|
|---|
| 486 | p++;
|
|---|
| 487 | continue;
|
|---|
| 488 | }
|
|---|
| 489 | q = index(p, '\'');
|
|---|
| 490 | if (!q) {
|
|---|
| 491 | out1fmt("'%s'", p );
|
|---|
| 492 | return;
|
|---|
| 493 | }
|
|---|
| 494 | out1fmt("'%.*s'", (int)(q - p), p );
|
|---|
| 495 | p = q;
|
|---|
| 496 | }
|
|---|
| 497 | }
|
|---|
| 498 |
|
|---|
| 499 | static int
|
|---|
| 500 | sort_var(const void *v_v1, const void *v_v2)
|
|---|
| 501 | {
|
|---|
| 502 | const struct var * const *v1 = v_v1;
|
|---|
| 503 | const struct var * const *v2 = v_v2;
|
|---|
| 504 |
|
|---|
| 505 | /* XXX Will anyone notice we include the '=' of the shorter name? */
|
|---|
| 506 | return strcoll((*v1)->text, (*v2)->text);
|
|---|
| 507 | }
|
|---|
| 508 |
|
|---|
| 509 | /*
|
|---|
| 510 | * POSIX requires that 'set' (but not export or readonly) output the
|
|---|
| 511 | * variables in lexicographic order - by the locale's collating order (sigh).
|
|---|
| 512 | * Maybe we could keep them in an ordered balanced binary tree
|
|---|
| 513 | * instead of hashed lists.
|
|---|
| 514 | * For now just roll 'em through qsort for printing...
|
|---|
| 515 | */
|
|---|
| 516 |
|
|---|
| 517 | int
|
|---|
| 518 | showvars(const char *name, int flag, int show_value)
|
|---|
| 519 | {
|
|---|
| 520 | struct var **vpp;
|
|---|
| 521 | struct var *vp;
|
|---|
| 522 | const char *p;
|
|---|
| 523 |
|
|---|
| 524 | static struct var **list; /* static in case we are interrupted */
|
|---|
| 525 | static int list_len;
|
|---|
| 526 | int count = 0;
|
|---|
| 527 |
|
|---|
| 528 | if (!list) {
|
|---|
| 529 | list_len = 32;
|
|---|
| 530 | list = ckmalloc(list_len * sizeof *list);
|
|---|
| 531 | }
|
|---|
| 532 |
|
|---|
| 533 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 534 | for (vp = *vpp ; vp ; vp = vp->next) {
|
|---|
| 535 | if (flag && !(vp->flags & flag))
|
|---|
| 536 | continue;
|
|---|
| 537 | if (vp->flags & VUNSET && !(show_value & 2))
|
|---|
| 538 | continue;
|
|---|
| 539 | if (count >= list_len) {
|
|---|
| 540 | list = ckrealloc(list,
|
|---|
| 541 | (list_len << 1) * sizeof *list);
|
|---|
| 542 | list_len <<= 1;
|
|---|
| 543 | }
|
|---|
| 544 | list[count++] = vp;
|
|---|
| 545 | }
|
|---|
| 546 | }
|
|---|
| 547 |
|
|---|
| 548 | qsort(list, count, sizeof *list, sort_var);
|
|---|
| 549 |
|
|---|
| 550 | for (vpp = list; count--; vpp++) {
|
|---|
| 551 | vp = *vpp;
|
|---|
| 552 | if (name)
|
|---|
| 553 | out1fmt("%s ", name);
|
|---|
| 554 | for (p = vp->text ; *p != '=' ; p++)
|
|---|
| 555 | out1c(*p);
|
|---|
| 556 | if (!(vp->flags & VUNSET) && show_value) {
|
|---|
| 557 | out1fmt("=");
|
|---|
| 558 | print_quoted(++p);
|
|---|
| 559 | }
|
|---|
| 560 | out1c('\n');
|
|---|
| 561 | }
|
|---|
| 562 | return 0;
|
|---|
| 563 | }
|
|---|
| 564 |
|
|---|
| 565 |
|
|---|
| 566 |
|
|---|
| 567 | /*
|
|---|
| 568 | * The export and readonly commands.
|
|---|
| 569 | */
|
|---|
| 570 |
|
|---|
| 571 | int
|
|---|
| 572 | exportcmd(int argc, char **argv)
|
|---|
| 573 | {
|
|---|
| 574 | struct var *vp;
|
|---|
| 575 | char *name;
|
|---|
| 576 | const char *p;
|
|---|
| 577 | int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
|
|---|
| 578 | int pflag;
|
|---|
| 579 |
|
|---|
| 580 | pflag = nextopt("p") == 'p' ? 3 : 0;
|
|---|
| 581 | if (argc <= 1 || pflag) {
|
|---|
| 582 | showvars( pflag ? argv[0] : 0, flag, pflag );
|
|---|
| 583 | return 0;
|
|---|
| 584 | }
|
|---|
| 585 |
|
|---|
| 586 | while ((name = *argptr++) != NULL) {
|
|---|
| 587 | if ((p = strchr(name, '=')) != NULL) {
|
|---|
| 588 | p++;
|
|---|
| 589 | } else {
|
|---|
| 590 | vp = find_var(name, NULL, NULL);
|
|---|
| 591 | if (vp != NULL) {
|
|---|
| 592 | vp->flags |= flag;
|
|---|
| 593 | continue;
|
|---|
| 594 | }
|
|---|
| 595 | }
|
|---|
| 596 | setvar(name, p, flag);
|
|---|
| 597 | }
|
|---|
| 598 | return 0;
|
|---|
| 599 | }
|
|---|
| 600 |
|
|---|
| 601 |
|
|---|
| 602 | /*
|
|---|
| 603 | * The "local" command.
|
|---|
| 604 | */
|
|---|
| 605 |
|
|---|
| 606 | int
|
|---|
| 607 | localcmd(int argc, char **argv)
|
|---|
| 608 | {
|
|---|
| 609 | char *name;
|
|---|
| 610 |
|
|---|
| 611 | if (! in_function())
|
|---|
| 612 | error("Not in a function");
|
|---|
| 613 | while ((name = *argptr++) != NULL) {
|
|---|
| 614 | mklocal(name, 0);
|
|---|
| 615 | }
|
|---|
| 616 | return 0;
|
|---|
| 617 | }
|
|---|
| 618 |
|
|---|
| 619 |
|
|---|
| 620 | /*
|
|---|
| 621 | * Make a variable a local variable. When a variable is made local, it's
|
|---|
| 622 | * value and flags are saved in a localvar structure. The saved values
|
|---|
| 623 | * will be restored when the shell function returns. We handle the name
|
|---|
| 624 | * "-" as a special case.
|
|---|
| 625 | */
|
|---|
| 626 |
|
|---|
| 627 | void
|
|---|
| 628 | mklocal(const char *name, int flags)
|
|---|
| 629 | {
|
|---|
| 630 | struct localvar *lvp;
|
|---|
| 631 | struct var **vpp;
|
|---|
| 632 | struct var *vp;
|
|---|
| 633 |
|
|---|
| 634 | INTOFF;
|
|---|
| 635 | lvp = ckmalloc(sizeof (struct localvar));
|
|---|
| 636 | if (name[0] == '-' && name[1] == '\0') {
|
|---|
| 637 | char *p;
|
|---|
| 638 | p = ckmalloc(sizeof_optlist);
|
|---|
| 639 | lvp->text = memcpy(p, optlist, sizeof_optlist);
|
|---|
| 640 | vp = NULL;
|
|---|
| 641 | } else {
|
|---|
| 642 | vp = find_var(name, &vpp, NULL);
|
|---|
| 643 | if (vp == NULL) {
|
|---|
| 644 | if (strchr(name, '='))
|
|---|
| 645 | setvareq(savestr(name), VSTRFIXED|flags);
|
|---|
| 646 | else
|
|---|
| 647 | setvar(name, NULL, VSTRFIXED|flags);
|
|---|
| 648 | vp = *vpp; /* the new variable */
|
|---|
| 649 | lvp->text = NULL;
|
|---|
| 650 | lvp->flags = VUNSET;
|
|---|
| 651 | } else {
|
|---|
| 652 | lvp->text = vp->text;
|
|---|
| 653 | lvp->flags = vp->flags;
|
|---|
| 654 | vp->flags |= VSTRFIXED|VTEXTFIXED;
|
|---|
| 655 | if (name[vp->name_len] == '=')
|
|---|
| 656 | setvareq(savestr(name), flags);
|
|---|
| 657 | }
|
|---|
| 658 | }
|
|---|
| 659 | lvp->vp = vp;
|
|---|
| 660 | lvp->next = localvars;
|
|---|
| 661 | localvars = lvp;
|
|---|
| 662 | INTON;
|
|---|
| 663 | }
|
|---|
| 664 |
|
|---|
| 665 |
|
|---|
| 666 | /*
|
|---|
| 667 | * Called after a function returns.
|
|---|
| 668 | */
|
|---|
| 669 |
|
|---|
| 670 | void
|
|---|
| 671 | poplocalvars(void)
|
|---|
| 672 | {
|
|---|
| 673 | struct localvar *lvp;
|
|---|
| 674 | struct var *vp;
|
|---|
| 675 |
|
|---|
| 676 | while ((lvp = localvars) != NULL) {
|
|---|
| 677 | localvars = lvp->next;
|
|---|
| 678 | vp = lvp->vp;
|
|---|
| 679 | TRACE(("poplocalvar %s", vp ? vp->text : "-"));
|
|---|
| 680 | if (vp == NULL) { /* $- saved */
|
|---|
| 681 | memcpy(optlist, lvp->text, sizeof_optlist);
|
|---|
| 682 | ckfree(lvp->text);
|
|---|
| 683 | } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
|
|---|
| 684 | (void)unsetvar(vp->text, 0);
|
|---|
| 685 | } else {
|
|---|
| 686 | if (vp->func && (vp->flags & VNOFUNC) == 0)
|
|---|
| 687 | (*vp->func)(lvp->text + vp->name_len + 1);
|
|---|
| 688 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 689 | ckfree(vp->text);
|
|---|
| 690 | vp->flags = lvp->flags;
|
|---|
| 691 | vp->text = lvp->text;
|
|---|
| 692 | }
|
|---|
| 693 | ckfree(lvp);
|
|---|
| 694 | }
|
|---|
| 695 | }
|
|---|
| 696 |
|
|---|
| 697 |
|
|---|
| 698 | int
|
|---|
| 699 | setvarcmd(int argc, char **argv)
|
|---|
| 700 | {
|
|---|
| 701 | if (argc <= 2)
|
|---|
| 702 | return unsetcmd(argc, argv);
|
|---|
| 703 | else if (argc == 3)
|
|---|
| 704 | setvar(argv[1], argv[2], 0);
|
|---|
| 705 | else
|
|---|
| 706 | error("List assignment not implemented");
|
|---|
| 707 | return 0;
|
|---|
| 708 | }
|
|---|
| 709 |
|
|---|
| 710 |
|
|---|
| 711 | /*
|
|---|
| 712 | * The unset builtin command. We unset the function before we unset the
|
|---|
| 713 | * variable to allow a function to be unset when there is a readonly variable
|
|---|
| 714 | * with the same name.
|
|---|
| 715 | */
|
|---|
| 716 |
|
|---|
| 717 | int
|
|---|
| 718 | unsetcmd(int argc, char **argv)
|
|---|
| 719 | {
|
|---|
| 720 | char **ap;
|
|---|
| 721 | int i;
|
|---|
| 722 | int flg_func = 0;
|
|---|
| 723 | int flg_var = 0;
|
|---|
| 724 | int ret = 0;
|
|---|
| 725 |
|
|---|
| 726 | while ((i = nextopt("evf")) != '\0') {
|
|---|
| 727 | if (i == 'f')
|
|---|
| 728 | flg_func = 1;
|
|---|
| 729 | else
|
|---|
| 730 | flg_var = i;
|
|---|
| 731 | }
|
|---|
| 732 | if (flg_func == 0 && flg_var == 0)
|
|---|
| 733 | flg_var = 1;
|
|---|
| 734 |
|
|---|
| 735 | for (ap = argptr; *ap ; ap++) {
|
|---|
| 736 | if (flg_func)
|
|---|
| 737 | ret |= unsetfunc(*ap);
|
|---|
| 738 | if (flg_var)
|
|---|
| 739 | ret |= unsetvar(*ap, flg_var == 'e');
|
|---|
| 740 | }
|
|---|
| 741 | return ret;
|
|---|
| 742 | }
|
|---|
| 743 |
|
|---|
| 744 |
|
|---|
| 745 | /*
|
|---|
| 746 | * Unset the specified variable.
|
|---|
| 747 | */
|
|---|
| 748 |
|
|---|
| 749 | int
|
|---|
| 750 | unsetvar(const char *s, int unexport)
|
|---|
| 751 | {
|
|---|
| 752 | struct var **vpp;
|
|---|
| 753 | struct var *vp;
|
|---|
| 754 |
|
|---|
| 755 | vp = find_var(s, &vpp, NULL);
|
|---|
| 756 | if (vp == NULL)
|
|---|
| 757 | return 1;
|
|---|
| 758 |
|
|---|
| 759 | if (vp->flags & VREADONLY)
|
|---|
| 760 | return (1);
|
|---|
| 761 |
|
|---|
| 762 | INTOFF;
|
|---|
| 763 | if (unexport) {
|
|---|
| 764 | vp->flags &= ~VEXPORT;
|
|---|
| 765 | } else {
|
|---|
| 766 | if (vp->text[vp->name_len + 1] != '\0')
|
|---|
| 767 | setvar(s, nullstr, 0);
|
|---|
| 768 | vp->flags &= ~VEXPORT;
|
|---|
| 769 | vp->flags |= VUNSET;
|
|---|
| 770 | if ((vp->flags & VSTRFIXED) == 0) {
|
|---|
| 771 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 772 | ckfree(vp->text);
|
|---|
| 773 | *vpp = vp->next;
|
|---|
| 774 | ckfree(vp);
|
|---|
| 775 | }
|
|---|
| 776 | }
|
|---|
| 777 | INTON;
|
|---|
| 778 | return 0;
|
|---|
| 779 | }
|
|---|
| 780 |
|
|---|
| 781 |
|
|---|
| 782 | /*
|
|---|
| 783 | * Returns true if the two strings specify the same varable. The first
|
|---|
| 784 | * variable name is terminated by '='; the second may be terminated by
|
|---|
| 785 | * either '=' or '\0'.
|
|---|
| 786 | */
|
|---|
| 787 |
|
|---|
| 788 | STATIC int
|
|---|
| 789 | strequal(const char *p, const char *q)
|
|---|
| 790 | {
|
|---|
| 791 | while (*p == *q++) {
|
|---|
| 792 | if (*p++ == '=')
|
|---|
| 793 | return 1;
|
|---|
| 794 | }
|
|---|
| 795 | if (*p == '=' && *(q - 1) == '\0')
|
|---|
| 796 | return 1;
|
|---|
| 797 | return 0;
|
|---|
| 798 | }
|
|---|
| 799 |
|
|---|
| 800 | /*
|
|---|
| 801 | * Search for a variable.
|
|---|
| 802 | * 'name' may be terminated by '=' or a NUL.
|
|---|
| 803 | * vppp is set to the pointer to vp, or the list head if vp isn't found
|
|---|
| 804 | * lenp is set to the number of charactets in 'name'
|
|---|
| 805 | */
|
|---|
| 806 |
|
|---|
| 807 | STATIC struct var *
|
|---|
| 808 | find_var(const char *name, struct var ***vppp, int *lenp)
|
|---|
| 809 | {
|
|---|
| 810 | unsigned int hashval;
|
|---|
| 811 | int len;
|
|---|
| 812 | struct var *vp, **vpp;
|
|---|
| 813 | const char *p = name;
|
|---|
| 814 |
|
|---|
| 815 | hashval = 0;
|
|---|
| 816 | while (*p && *p != '=')
|
|---|
| 817 | hashval = 2 * hashval + (unsigned char)*p++;
|
|---|
| 818 | len = p - name;
|
|---|
| 819 |
|
|---|
| 820 | if (lenp)
|
|---|
| 821 | *lenp = len;
|
|---|
| 822 | vpp = &vartab[hashval % VTABSIZE];
|
|---|
| 823 | if (vppp)
|
|---|
| 824 | *vppp = vpp;
|
|---|
| 825 |
|
|---|
| 826 | for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
|
|---|
| 827 | if (vp->name_len != len)
|
|---|
| 828 | continue;
|
|---|
| 829 | if (memcmp(vp->text, name, len) != 0)
|
|---|
| 830 | continue;
|
|---|
| 831 | if (vppp)
|
|---|
| 832 | *vppp = vpp;
|
|---|
| 833 | return vp;
|
|---|
| 834 | }
|
|---|
| 835 | return NULL;
|
|---|
| 836 | }
|
|---|
