| 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 | #ifdef HAVE_SYS_CDEFS_H
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| 36 | #include <sys/cdefs.h>
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| 37 | #endif
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| 38 | #ifndef lint
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| 39 | #if 0
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| 40 | static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 5/4/95";
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| 41 | #else
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| 42 | __RCSID("$NetBSD: var.c,v 1.36 2004/10/06 10:23:43 enami Exp $");
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| 43 | #endif
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| 44 | #endif /* not lint */
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| 45 |
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| 46 | #include <unistd.h>
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| 47 | #include <stdlib.h>
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| 48 | #include <strings.h>
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| 49 | #ifndef __sun__
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| 50 | #include <paths.h>
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| 51 | #else
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| 52 | #define _PATH_DEFPATH "/usr/bin:/usr/sbin"
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| 53 | #include <iso/limits_iso.h>
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| 54 | #endif
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| 55 |
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| 56 | #ifdef PC_OS2_LIBPATHS
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| 57 | #define INCL_BASE
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| 58 | #include <os2.h>
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| 59 |
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| 60 | #ifndef LIBPATHSTRICT
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| 61 | #define LIBPATHSTRICT 3
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| 62 | #endif
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| 63 |
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| 64 | extern APIRET
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| 65 | #ifdef APIENTRY
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| 66 | APIENTRY
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| 67 | #endif
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| 68 | DosQueryHeaderInfo(HMODULE hmod, ULONG ulIndex, PVOID pvBuffer, ULONG cbBuffer, ULONG ulSubFunction);
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| 69 | #define QHINF_EXEINFO 1 /* NE exeinfo. */
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| 70 | #define QHINF_READRSRCTBL 2 /* Reads from the resource table. */
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| 71 | #define QHINF_READFILE 3 /* Reads from the executable file. */
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| 72 | #define QHINF_LIBPATHLENGTH 4 /* Gets the libpath length. */
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| 73 | #define QHINF_LIBPATH 5 /* Gets the entire libpath. */
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| 74 | #define QHINF_FIXENTRY 6 /* NE only */
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| 75 | #define QHINF_STE 7 /* NE only */
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| 76 | #define QHINF_MAPSEL 8 /* NE only */
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| 77 |
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| 78 | #endif
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| 79 |
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| 80 |
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| 81 | /*
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| 82 | * Shell variables.
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| 83 | */
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| 84 |
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| 85 | #include "shell.h"
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| 86 | #include "output.h"
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| 87 | #include "expand.h"
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| 88 | #include "nodes.h" /* for other headers */
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| 89 | #include "eval.h" /* defines cmdenviron */
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| 90 | #include "exec.h"
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| 91 | #include "syntax.h"
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| 92 | #include "options.h"
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| 93 | #include "mail.h"
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| 94 | #include "var.h"
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| 95 | #include "memalloc.h"
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| 96 | #include "error.h"
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| 97 | #include "mystring.h"
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| 98 | #include "parser.h"
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| 99 | #include "show.h"
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| 100 | #ifndef SMALL
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| 101 | #include "myhistedit.h"
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| 102 | #endif
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| 103 |
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| 104 | #ifdef SMALL
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| 105 | #define VTABSIZE 39
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| 106 | #else
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| 107 | #define VTABSIZE 517
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| 108 | #endif
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| 109 |
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| 110 |
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| 111 | struct varinit {
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| 112 | struct var *var;
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| 113 | int flags;
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| 114 | const char *text;
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| 115 | void (*func)(const char *);
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| 116 | };
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| 117 |
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| 118 |
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| 119 | #if ATTY
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| 120 | struct var vatty;
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| 121 | #endif
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| 122 | #ifndef SMALL
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| 123 | struct var vhistsize;
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| 124 | struct var vterm;
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| 125 | #endif
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| 126 | struct var vifs;
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| 127 | struct var vmail;
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| 128 | struct var vmpath;
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| 129 | struct var vpath;
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| 130 | #ifdef _MSC_VER
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| 131 | struct var vpath2;
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| 132 | #endif
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| 133 | struct var vps1;
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| 134 | struct var vps2;
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| 135 | struct var vps4;
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| 136 | struct var vvers;
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| 137 | struct var voptind;
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| 138 |
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| 139 | #ifdef PC_OS2_LIBPATHS
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| 140 | static struct var libpath_vars[4];
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| 141 | static const char *libpath_envs[4] = {"LIBPATH=", "BEGINLIBPATH=", "ENDLIBPATH=", "LIBPATHSTRICT="};
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| 142 | #endif
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| 143 |
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| 144 | const struct varinit varinit[] = {
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| 145 | #if ATTY
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| 146 | { &vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY=",
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| 147 | NULL },
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| 148 | #endif
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| 149 | #ifndef SMALL
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| 150 | { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=",
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| 151 | sethistsize },
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| 152 | #endif
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| 153 | { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n",
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| 154 | NULL },
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| 155 | { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
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| 156 | NULL },
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| 157 | { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
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| 158 | NULL },
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| 159 | { &vpath, VSTRFIXED|VTEXTFIXED, "PATH=" _PATH_DEFPATH,
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| 160 | changepath },
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| 161 | #ifdef _MSC_VER
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| 162 | { &vpath2, VSTRFIXED|VTEXTFIXED, "Path=",
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| 163 | changepath },
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| 164 | #endif
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| 165 | /*
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| 166 | * vps1 depends on uid
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| 167 | */
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| 168 | { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
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| 169 | NULL },
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| 170 | { &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ",
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| 171 | NULL },
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| 172 | #ifndef SMALL
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| 173 | { &vterm, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM=",
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| 174 | setterm },
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| 175 | #endif
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| 176 | { &voptind, VSTRFIXED|VTEXTFIXED|VNOFUNC, "OPTIND=1",
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| 177 | getoptsreset },
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| 178 | { NULL, 0, NULL,
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| 179 | NULL }
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| 180 | };
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| 181 |
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| 182 | struct var *vartab[VTABSIZE];
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| 183 |
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| 184 | STATIC int strequal(const char *, const char *);
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| 185 | STATIC struct var *find_var(const char *, struct var ***, int *);
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| 186 |
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| 187 | /*
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| 188 | * Initialize the varable symbol tables and import the environment
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| 189 | */
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| 190 |
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| 191 | #ifdef mkinit
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| 192 | INCLUDE "var.h"
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| 193 | MKINIT char **environ;
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| 194 | INIT {
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| 195 | char **envp;
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| 196 |
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| 197 | initvar();
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| 198 | for (envp = environ ; *envp ; envp++) {
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| 199 | if (strchr(*envp, '=')) {
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| 200 | setvareq(*envp, VEXPORT|VTEXTFIXED);
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| 201 | }
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| 202 | }
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| 203 | }
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| 204 | #endif
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| 205 |
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| 206 |
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| 207 | /*
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| 208 | * This routine initializes the builtin variables. It is called when the
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| 209 | * shell is initialized and again when a shell procedure is spawned.
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| 210 | */
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| 211 |
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| 212 | void
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| 213 | initvar(void)
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| 214 | {
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| 215 | const struct varinit *ip;
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| 216 | struct var *vp;
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| 217 | struct var **vpp;
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| 218 |
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| 219 | #ifdef PC_OS2_LIBPATHS
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| 220 | char *psz = ckmalloc(2048);
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| 221 | int rc;
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| 222 | int i;
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| 223 | for (i = 0; i < 4; i++)
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| 224 | {
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| 225 | libpath_vars[i].flags = VSTRFIXED | VOS2LIBPATH;
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| 226 | libpath_vars[i].func = NULL;
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| 227 |
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| 228 | if (i > 0)
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| 229 | {
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| 230 | psz[0] = psz[1] = psz[2] = psz[3] = '\0';
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| 231 | rc = DosQueryExtLIBPATH(psz, i);
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| 232 | }
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| 233 | else
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| 234 | {
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| 235 | rc = DosQueryHeaderInfo(NULLHANDLE, 0, psz, 2048, QHINF_LIBPATH);
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| 236 | libpath_vars[i].flags |= VREADONLY;
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| 237 | }
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| 238 | if (!rc && *psz)
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| 239 | {
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| 240 | int cch1 = strlen(libpath_envs[i]);
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| 241 | int cch2 = strlen(psz) + 1;
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| 242 | libpath_vars[i].text = ckmalloc(cch1 + cch2);
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| 243 | memcpy(libpath_vars[i].text, libpath_envs[i], cch1);
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| 244 | memcpy(libpath_vars[i].text + cch1, psz, cch2);
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| 245 | }
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| 246 | else
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| 247 | {
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| 248 | libpath_vars[i].flags |= VUNSET | VTEXTFIXED;
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| 249 | libpath_vars[i].text = (char*)libpath_envs[i];
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| 250 | }
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| 251 | if (find_var(libpath_vars[i].text, &vpp, &libpath_vars[i].name_len) != NULL)
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| 252 | continue;
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| 253 | libpath_vars[i].next = *vpp;
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| 254 | *vpp = &libpath_vars[i];
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| 255 | }
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| 256 | free(psz);
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| 257 | #endif
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| 258 |
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| 259 | for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
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| 260 | if (find_var(ip->text, &vpp, &vp->name_len) != NULL)
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| 261 | continue;
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| 262 | vp->next = *vpp;
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| 263 | *vpp = vp;
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| 264 | vp->text = strdup(ip->text);
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| 265 | vp->flags = ip->flags;
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| 266 | vp->func = ip->func;
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| 267 | }
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| 268 | /*
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| 269 | * PS1 depends on uid
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| 270 | */
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| 271 | if (find_var("PS1", &vpp, &vps1.name_len) == NULL) {
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| 272 | vps1.next = *vpp;
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| 273 | *vpp = &vps1;
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| 274 | vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
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| 275 | vps1.flags = VSTRFIXED|VTEXTFIXED;
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| 276 | }
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| 277 | }
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| 278 |
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| 279 | /*
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| 280 | * Safe version of setvar, returns 1 on success 0 on failure.
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| 281 | */
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| 282 |
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| 283 | int
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| 284 | setvarsafe(const char *name, const char *val, int flags)
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| 285 | {
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| 286 | struct jmploc jmploc;
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| 287 | struct jmploc *volatile savehandler = handler;
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| 288 | int err = 0;
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| 289 | #ifdef __GNUC__
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| 290 | (void) &err;
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| 291 | #endif
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| 292 |
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| 293 | if (setjmp(jmploc.loc))
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| 294 | err = 1;
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| 295 | else {
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| 296 | handler = &jmploc;
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| 297 | setvar(name, val, flags);
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| 298 | }
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| 299 | handler = savehandler;
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| 300 | return err;
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| 301 | }
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| 302 |
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| 303 | /*
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| 304 | * Set the value of a variable. The flags argument is ored with the
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| 305 | * flags of the variable. If val is NULL, the variable is unset.
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| 306 | */
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| 307 |
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| 308 | void
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| 309 | setvar(const char *name, const char *val, int flags)
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| 310 | {
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| 311 | const char *p;
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| 312 | const char *q;
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| 313 | char *d;
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| 314 | int len;
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| 315 | int namelen;
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| 316 | char *nameeq;
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| 317 | int isbad;
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| 318 |
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| 319 | isbad = 0;
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| 320 | p = name;
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| 321 | if (! is_name(*p))
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| 322 | isbad = 1;
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| 323 | p++;
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| 324 | for (;;) {
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| 325 | if (! is_in_name(*p)) {
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| 326 | if (*p == '\0' || *p == '=')
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| 327 | break;
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| 328 | isbad = 1;
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| 329 | }
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| 330 | p++;
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| 331 | }
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| 332 | namelen = p - name;
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| 333 | if (isbad)
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| 334 | error("%.*s: bad variable name", namelen, name);
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| 335 | len = namelen + 2; /* 2 is space for '=' and '\0' */
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| 336 | if (val == NULL) {
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| 337 | flags |= VUNSET;
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| 338 | } else {
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| 339 | len += strlen(val);
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| 340 | }
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| 341 | d = nameeq = ckmalloc(len);
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| 342 | q = name;
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| 343 | while (--namelen >= 0)
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| 344 | *d++ = *q++;
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| 345 | *d++ = '=';
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| 346 | *d = '\0';
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| 347 | if (val)
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| 348 | scopy(val, d);
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| 349 | setvareq(nameeq, flags);
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| 350 | }
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| 351 |
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| 352 |
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| 353 |
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| 354 | /*
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| 355 | * Same as setvar except that the variable and value are passed in
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| 356 | * the first argument as name=value. Since the first argument will
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| 357 | * be actually stored in the table, it should not be a string that
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| 358 | * will go away.
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| 359 | */
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| 360 |
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| 361 | void
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| 362 | setvareq(char *s, int flags)
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| 363 | {
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| 364 | struct var *vp, **vpp;
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| 365 | int nlen;
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| 366 |
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| 367 | if (aflag)
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| 368 | flags |= VEXPORT;
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| 369 | vp = find_var(s, &vpp, &nlen);
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| 370 | if (vp != NULL) {
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| 371 | if (vp->flags & VREADONLY)
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| 372 | error("%.*s: is read only", vp->name_len, s);
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| 373 | if (flags & VNOSET)
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| 374 | return;
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| 375 | INTOFF;
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| 376 |
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| 377 | if (vp->func && (flags & VNOFUNC) == 0)
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| 378 | (*vp->func)(s + vp->name_len + 1);
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| 379 |
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| 380 | if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
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| 381 | ckfree(vp->text);
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| 382 |
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| 383 | vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
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| 384 | vp->flags |= flags & ~VNOFUNC;
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| 385 | vp->text = s;
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| 386 | #ifdef PC_OS2_LIBPATHS
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| 387 | if ((vp->flags & VOS2LIBPATH) && (vp->flags & VEXPORT))
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| 388 | vp->flags &= ~VEXPORT;
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| 389 | #endif
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| 390 |
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| 391 | /*
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| 392 | * We could roll this to a function, to handle it as
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| 393 | * a regular variable function callback, but why bother?
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| 394 | */
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| 395 | if (vp == &vmpath || (vp == &vmail && ! mpathset()))
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| 396 | chkmail(1);
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| 397 | INTON;
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| 398 | return;
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| 399 | }
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| 400 | /* not found */
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| 401 | if (flags & VNOSET)
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| 402 | return;
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| 403 | vp = ckmalloc(sizeof (*vp));
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| 404 | vp->flags = flags & ~VNOFUNC;
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| 405 | vp->text = s;
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| 406 | vp->name_len = nlen;
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| 407 | vp->next = *vpp;
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| 408 | vp->func = NULL;
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| 409 | *vpp = vp;
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| 410 | }
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| 411 |
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| 412 |
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| 413 |
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| 414 | /*
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| 415 | * Process a linked list of variable assignments.
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| 416 | */
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| 417 |
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| 418 | void
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| 419 | listsetvar(struct strlist *list, int flags)
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| 420 | {
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| 421 | struct strlist *lp;
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| 422 |
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| 423 | INTOFF;
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| 424 | for (lp = list ; lp ; lp = lp->next) {
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| 425 | setvareq(savestr(lp->text), flags);
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| 426 | }
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|---|
| 427 | INTON;
|
|---|
| 428 | }
|
|---|
| 429 |
|
|---|
| 430 | void
|
|---|
| 431 | listmklocal(struct strlist *list, int flags)
|
|---|
| 432 | {
|
|---|
| 433 | struct strlist *lp;
|
|---|
| 434 |
|
|---|
| 435 | for (lp = list ; lp ; lp = lp->next)
|
|---|
| 436 | mklocal(lp->text, flags);
|
|---|
| 437 | }
|
|---|
| 438 |
|
|---|
| 439 |
|
|---|
| 440 | /*
|
|---|
| 441 | * Find the value of a variable. Returns NULL if not set.
|
|---|
| 442 | */
|
|---|
| 443 |
|
|---|
| 444 | char *
|
|---|
| 445 | lookupvar(const char *name)
|
|---|
| 446 | {
|
|---|
| 447 | struct var *v;
|
|---|
| 448 |
|
|---|
| 449 | v = find_var(name, NULL, NULL);
|
|---|
| 450 | if (v == NULL || v->flags & VUNSET)
|
|---|
| 451 | return NULL;
|
|---|
| 452 | return v->text + v->name_len + 1;
|
|---|
| 453 | }
|
|---|
| 454 |
|
|---|
| 455 |
|
|---|
| 456 |
|
|---|
| 457 | /*
|
|---|
| 458 | * Search the environment of a builtin command. If the second argument
|
|---|
| 459 | * is nonzero, return the value of a variable even if it hasn't been
|
|---|
| 460 | * exported.
|
|---|
| 461 | */
|
|---|
| 462 |
|
|---|
| 463 | char *
|
|---|
| 464 | bltinlookup(const char *name, int doall)
|
|---|
| 465 | {
|
|---|
| 466 | struct strlist *sp;
|
|---|
| 467 | struct var *v;
|
|---|
| 468 |
|
|---|
| 469 | for (sp = cmdenviron ; sp ; sp = sp->next) {
|
|---|
| 470 | if (strequal(sp->text, name))
|
|---|
| 471 | return strchr(sp->text, '=') + 1;
|
|---|
| 472 | }
|
|---|
| 473 |
|
|---|
| 474 | v = find_var(name, NULL, NULL);
|
|---|
| 475 |
|
|---|
| 476 | if (v == NULL || v->flags & VUNSET || (!doall && !(v->flags & VEXPORT)))
|
|---|
| 477 | return NULL;
|
|---|
| 478 | return v->text + v->name_len + 1;
|
|---|
| 479 | }
|
|---|
| 480 |
|
|---|
| 481 |
|
|---|
| 482 |
|
|---|
| 483 | /*
|
|---|
| 484 | * Generate a list of exported variables. This routine is used to construct
|
|---|
| 485 | * the third argument to execve when executing a program.
|
|---|
| 486 | */
|
|---|
| 487 |
|
|---|
| 488 | char **
|
|---|
| 489 | environment(void)
|
|---|
| 490 | {
|
|---|
| 491 | int nenv;
|
|---|
| 492 | struct var **vpp;
|
|---|
| 493 | struct var *vp;
|
|---|
| 494 | char **env;
|
|---|
| 495 | char **ep;
|
|---|
| 496 |
|
|---|
| 497 | nenv = 0;
|
|---|
| 498 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 499 | for (vp = *vpp ; vp ; vp = vp->next)
|
|---|
| 500 | if (vp->flags & VEXPORT)
|
|---|
| 501 | nenv++;
|
|---|
| 502 | }
|
|---|
| 503 | ep = env = stalloc((nenv + 1) * sizeof *env);
|
|---|
| 504 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 505 | for (vp = *vpp ; vp ; vp = vp->next)
|
|---|
| 506 | if (vp->flags & VEXPORT)
|
|---|
| 507 | *ep++ = vp->text;
|
|---|
| 508 | }
|
|---|
| 509 | *ep = NULL;
|
|---|
| 510 |
|
|---|
| 511 | #ifdef PC_OS2_LIBPATHS
|
|---|
| 512 | /*
|
|---|
| 513 | * Set the libpaths now as this is exec() time.
|
|---|
| 514 | */
|
|---|
| 515 | for (nenv = 0; nenv < 3; nenv++)
|
|---|
| 516 | DosSetExtLIBPATH(strchr(libpath_vars[nenv].text, '=') + 1, nenv);
|
|---|
| 517 | #endif
|
|---|
| 518 |
|
|---|
| 519 | return env;
|
|---|
| 520 | }
|
|---|
| 521 |
|
|---|
| 522 |
|
|---|
| 523 | /*
|
|---|
| 524 | * Called when a shell procedure is invoked to clear out nonexported
|
|---|
| 525 | * variables. It is also necessary to reallocate variables of with
|
|---|
| 526 | * VSTACK set since these are currently allocated on the stack.
|
|---|
| 527 | */
|
|---|
| 528 |
|
|---|
| 529 | #ifdef mkinit
|
|---|
| 530 | void shprocvar(void);
|
|---|
| 531 |
|
|---|
| 532 | SHELLPROC {
|
|---|
| 533 | shprocvar();
|
|---|
| 534 | }
|
|---|
| 535 | #endif
|
|---|
| 536 |
|
|---|
| 537 | void
|
|---|
| 538 | shprocvar(void)
|
|---|
| 539 | {
|
|---|
| 540 | struct var **vpp;
|
|---|
| 541 | struct var *vp, **prev;
|
|---|
| 542 |
|
|---|
| 543 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 544 | for (prev = vpp ; (vp = *prev) != NULL ; ) {
|
|---|
| 545 | if ((vp->flags & VEXPORT) == 0) {
|
|---|
| 546 | *prev = vp->next;
|
|---|
| 547 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 548 | ckfree(vp->text);
|
|---|
| 549 | if ((vp->flags & VSTRFIXED) == 0)
|
|---|
| 550 | ckfree(vp);
|
|---|
| 551 | } else {
|
|---|
| 552 | if (vp->flags & VSTACK) {
|
|---|
| 553 | vp->text = savestr(vp->text);
|
|---|
| 554 | vp->flags &=~ VSTACK;
|
|---|
| 555 | }
|
|---|
| 556 | prev = &vp->next;
|
|---|
| 557 | }
|
|---|
| 558 | }
|
|---|
| 559 | }
|
|---|
| 560 | initvar();
|
|---|
| 561 | }
|
|---|
| 562 |
|
|---|
| 563 |
|
|---|
| 564 |
|
|---|
| 565 | /*
|
|---|
| 566 | * Command to list all variables which are set. Currently this command
|
|---|
| 567 | * is invoked from the set command when the set command is called without
|
|---|
| 568 | * any variables.
|
|---|
| 569 | */
|
|---|
| 570 |
|
|---|
| 571 | void
|
|---|
| 572 | print_quoted(const char *p)
|
|---|
| 573 | {
|
|---|
| 574 | const char *q;
|
|---|
| 575 |
|
|---|
| 576 | if (strcspn(p, "|&;<>()$`\\\"' \t\n*?[]#~=%") == strlen(p)) {
|
|---|
| 577 | out1fmt("%s", p);
|
|---|
| 578 | return;
|
|---|
| 579 | }
|
|---|
| 580 | while (*p) {
|
|---|
| 581 | if (*p == '\'') {
|
|---|
| 582 | out1fmt("\\'");
|
|---|
| 583 | p++;
|
|---|
| 584 | continue;
|
|---|
| 585 | }
|
|---|
| 586 | q = index(p, '\'');
|
|---|
| 587 | if (!q) {
|
|---|
| 588 | out1fmt("'%s'", p );
|
|---|
| 589 | return;
|
|---|
| 590 | }
|
|---|
| 591 | out1fmt("'%.*s'", (int)(q - p), p );
|
|---|
| 592 | p = q;
|
|---|
| 593 | }
|
|---|
| 594 | }
|
|---|
| 595 |
|
|---|
| 596 | static int
|
|---|
| 597 | sort_var(const void *v_v1, const void *v_v2)
|
|---|
| 598 | {
|
|---|
| 599 | const struct var * const *v1 = v_v1;
|
|---|
| 600 | const struct var * const *v2 = v_v2;
|
|---|
| 601 |
|
|---|
| 602 | /* XXX Will anyone notice we include the '=' of the shorter name? */
|
|---|
| 603 | return strcoll((*v1)->text, (*v2)->text);
|
|---|
| 604 | }
|
|---|
| 605 |
|
|---|
| 606 | /*
|
|---|
| 607 | * POSIX requires that 'set' (but not export or readonly) output the
|
|---|
| 608 | * variables in lexicographic order - by the locale's collating order (sigh).
|
|---|
| 609 | * Maybe we could keep them in an ordered balanced binary tree
|
|---|
| 610 | * instead of hashed lists.
|
|---|
| 611 | * For now just roll 'em through qsort for printing...
|
|---|
| 612 | */
|
|---|
| 613 |
|
|---|
| 614 | int
|
|---|
| 615 | showvars(const char *name, int flag, int show_value)
|
|---|
| 616 | {
|
|---|
| 617 | struct var **vpp;
|
|---|
| 618 | struct var *vp;
|
|---|
| 619 | const char *p;
|
|---|
| 620 |
|
|---|
| 621 | static struct var **list; /* static in case we are interrupted */
|
|---|
| 622 | static int list_len;
|
|---|
| 623 | int count = 0;
|
|---|
| 624 |
|
|---|
| 625 | if (!list) {
|
|---|
| 626 | list_len = 32;
|
|---|
| 627 | list = ckmalloc(list_len * sizeof *list);
|
|---|
| 628 | }
|
|---|
| 629 |
|
|---|
| 630 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 631 | for (vp = *vpp ; vp ; vp = vp->next) {
|
|---|
| 632 | if (flag && !(vp->flags & flag))
|
|---|
| 633 | continue;
|
|---|
| 634 | if (vp->flags & VUNSET && !(show_value & 2))
|
|---|
| 635 | continue;
|
|---|
| 636 | if (count >= list_len) {
|
|---|
| 637 | list = ckrealloc(list,
|
|---|
| 638 | (list_len << 1) * sizeof *list);
|
|---|
| 639 | list_len <<= 1;
|
|---|
| 640 | }
|
|---|
| 641 | list[count++] = vp;
|
|---|
| 642 | }
|
|---|
| 643 | }
|
|---|
| 644 |
|
|---|
| 645 | qsort(list, count, sizeof *list, sort_var);
|
|---|
| 646 |
|
|---|
| 647 | for (vpp = list; count--; vpp++) {
|
|---|
| 648 | vp = *vpp;
|
|---|
| 649 | if (name)
|
|---|
| 650 | out1fmt("%s ", name);
|
|---|
| 651 | for (p = vp->text ; *p != '=' ; p++)
|
|---|
| 652 | out1c(*p);
|
|---|
| 653 | if (!(vp->flags & VUNSET) && show_value) {
|
|---|
| 654 | out1fmt("=");
|
|---|
| 655 | print_quoted(++p);
|
|---|
| 656 | }
|
|---|
| 657 | out1c('\n');
|
|---|
| 658 | }
|
|---|
| 659 | return 0;
|
|---|
| 660 | }
|
|---|
| 661 |
|
|---|
| 662 |
|
|---|
| 663 |
|
|---|
| 664 | /*
|
|---|
| 665 | * The export and readonly commands.
|
|---|
| 666 | */
|
|---|
| 667 |
|
|---|
| 668 | int
|
|---|
| 669 | exportcmd(int argc, char **argv)
|
|---|
| 670 | {
|
|---|
| 671 | struct var *vp;
|
|---|
| 672 | char *name;
|
|---|
| 673 | const char *p;
|
|---|
| 674 | int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
|
|---|
| 675 | int pflag;
|
|---|
| 676 |
|
|---|
| 677 | pflag = nextopt("p") == 'p' ? 3 : 0;
|
|---|
| 678 | if (argc <= 1 || pflag) {
|
|---|
| 679 | showvars( pflag ? argv[0] : 0, flag, pflag );
|
|---|
| 680 | return 0;
|
|---|
| 681 | }
|
|---|
| 682 |
|
|---|
| 683 | while ((name = *argptr++) != NULL) {
|
|---|
| 684 | if ((p = strchr(name, '=')) != NULL) {
|
|---|
| 685 | p++;
|
|---|
| 686 | } else {
|
|---|
| 687 | vp = find_var(name, NULL, NULL);
|
|---|
| 688 | if (vp != NULL) {
|
|---|
| 689 | vp->flags |= flag;
|
|---|
| 690 | continue;
|
|---|
| 691 | }
|
|---|
| 692 | }
|
|---|
| 693 | setvar(name, p, flag);
|
|---|
| 694 | }
|
|---|
| 695 | return 0;
|
|---|
| 696 | }
|
|---|
| 697 |
|
|---|
| 698 |
|
|---|
| 699 | /*
|
|---|
| 700 | * The "local" command.
|
|---|
| 701 | */
|
|---|
| 702 |
|
|---|
| 703 | int
|
|---|
| 704 | localcmd(int argc, char **argv)
|
|---|
| 705 | {
|
|---|
| 706 | char *name;
|
|---|
| 707 |
|
|---|
| 708 | if (! in_function())
|
|---|
| 709 | error("Not in a function");
|
|---|
| 710 | while ((name = *argptr++) != NULL) {
|
|---|
| 711 | mklocal(name, 0);
|
|---|
| 712 | }
|
|---|
| 713 | return 0;
|
|---|
| 714 | }
|
|---|
| 715 |
|
|---|
| 716 |
|
|---|
| 717 | /*
|
|---|
| 718 | * Make a variable a local variable. When a variable is made local, it's
|
|---|
| 719 | * value and flags are saved in a localvar structure. The saved values
|
|---|
| 720 | * will be restored when the shell function returns. We handle the name
|
|---|
| 721 | * "-" as a special case.
|
|---|
| 722 | */
|
|---|
| 723 |
|
|---|
| 724 | void
|
|---|
| 725 | mklocal(const char *name, int flags)
|
|---|
| 726 | {
|
|---|
| 727 | struct localvar *lvp;
|
|---|
| 728 | struct var **vpp;
|
|---|
| 729 | struct var *vp;
|
|---|
| 730 |
|
|---|
| 731 | INTOFF;
|
|---|
| 732 | lvp = ckmalloc(sizeof (struct localvar));
|
|---|
| 733 | if (name[0] == '-' && name[1] == '\0') {
|
|---|
| 734 | char *p;
|
|---|
| 735 | p = ckmalloc(sizeof_optlist);
|
|---|
| 736 | lvp->text = memcpy(p, optlist, sizeof_optlist);
|
|---|
| 737 | vp = NULL;
|
|---|
| 738 | } else {
|
|---|
| 739 | vp = find_var(name, &vpp, NULL);
|
|---|
| 740 | if (vp == NULL) {
|
|---|
| 741 | if (strchr(name, '='))
|
|---|
| 742 | setvareq(savestr(name), VSTRFIXED|flags);
|
|---|
| 743 | else
|
|---|
| 744 | setvar(name, NULL, VSTRFIXED|flags);
|
|---|
| 745 | vp = *vpp; /* the new variable */
|
|---|
| 746 | lvp->text = NULL;
|
|---|
| 747 | lvp->flags = VUNSET;
|
|---|
| 748 | } else {
|
|---|
| 749 | lvp->text = vp->text;
|
|---|
| 750 | lvp->flags = vp->flags;
|
|---|
| 751 | vp->flags |= VSTRFIXED|VTEXTFIXED;
|
|---|
| 752 | if (name[vp->name_len] == '=')
|
|---|
| 753 | setvareq(savestr(name), flags);
|
|---|
| 754 | }
|
|---|
| 755 | }
|
|---|
| 756 | lvp->vp = vp;
|
|---|
| 757 | lvp->next = localvars;
|
|---|
| 758 | localvars = lvp;
|
|---|
| 759 | INTON;
|
|---|
| 760 | }
|
|---|
| 761 |
|
|---|
| 762 |
|
|---|
| 763 | /*
|
|---|
| 764 | * Called after a function returns.
|
|---|
| 765 | */
|
|---|
| 766 |
|
|---|
| 767 | void
|
|---|
| 768 | poplocalvars(void)
|
|---|
| 769 | {
|
|---|
| 770 | struct localvar *lvp;
|
|---|
| 771 | struct var *vp;
|
|---|
| 772 |
|
|---|
| 773 | while ((lvp = localvars) != NULL) {
|
|---|
| 774 | localvars = lvp->next;
|
|---|
| 775 | vp = lvp->vp;
|
|---|
| 776 | TRACE(("poplocalvar %s", vp ? vp->text : "-"));
|
|---|
| 777 | if (vp == NULL) { /* $- saved */
|
|---|
| 778 | memcpy(optlist, lvp->text, sizeof_optlist);
|
|---|
| 779 | ckfree(lvp->text);
|
|---|
| 780 | } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
|
|---|
| 781 | (void)unsetvar(vp->text, 0);
|
|---|
| 782 | } else {
|
|---|
| 783 | if (vp->func && (vp->flags & VNOFUNC) == 0)
|
|---|
| 784 | (*vp->func)(lvp->text + vp->name_len + 1);
|
|---|
| 785 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 786 | ckfree(vp->text);
|
|---|
| 787 | vp->flags = lvp->flags;
|
|---|
| 788 | vp->text = lvp->text;
|
|---|
| 789 | }
|
|---|
| 790 | ckfree(lvp);
|
|---|
| 791 | }
|
|---|
| 792 | }
|
|---|
| 793 |
|
|---|
| 794 |
|
|---|
| 795 | int
|
|---|
| 796 | setvarcmd(int argc, char **argv)
|
|---|
| 797 | {
|
|---|
| 798 | if (argc <= 2)
|
|---|
| 799 | return unsetcmd(argc, argv);
|
|---|
| 800 | else if (argc == 3)
|
|---|
| 801 | setvar(argv[1], argv[2], 0);
|
|---|
| 802 | else
|
|---|
| 803 | error("List assignment not implemented");
|
|---|
| 804 | return 0;
|
|---|
| 805 | }
|
|---|
| 806 |
|
|---|
| 807 |
|
|---|
| 808 | /*
|
|---|
| 809 | * The unset builtin command. We unset the function before we unset the
|
|---|
| 810 | * variable to allow a function to be unset when there is a readonly variable
|
|---|
| 811 | * with the same name.
|
|---|
| 812 | */
|
|---|
| 813 |
|
|---|
| 814 | int
|
|---|
| 815 | unsetcmd(int argc, char **argv)
|
|---|
| 816 | {
|
|---|
| 817 | char **ap;
|
|---|
| 818 | int i;
|
|---|
| 819 | int flg_func = 0;
|
|---|
| 820 | int flg_var = 0;
|
|---|
| 821 | int ret = 0;
|
|---|
| 822 |
|
|---|
| 823 | while ((i = nextopt("evf")) != '\0') {
|
|---|
| 824 | if (i == 'f')
|
|---|
| 825 | flg_func = 1;
|
|---|
| 826 | else
|
|---|
| 827 | flg_var = i;
|
|---|
| 828 | }
|
|---|
| 829 | if (flg_func == 0 && flg_var == 0)
|
|---|
| 830 | flg_var = 1;
|
|---|
| 831 |
|
|---|
| 832 | for (ap = argptr; *ap ; ap++) {
|
|---|
| 833 | if (flg_func)
|
|---|
| 834 | ret |= unsetfunc(*ap);
|
|---|
| 835 | if (flg_var)
|
|---|
| 836 | ret |= unsetvar(*ap, flg_var == 'e');
|
|---|
| 837 | }
|
|---|
| 838 | return ret;
|
|---|
| 839 | }
|
|---|
| 840 |
|
|---|
| 841 |
|
|---|
| 842 | /*
|
|---|
| 843 | * Unset the specified variable.
|
|---|
| 844 | */
|
|---|
| 845 |
|
|---|
| 846 | int
|
|---|
| 847 | unsetvar(const char *s, int unexport)
|
|---|
| 848 | {
|
|---|
| 849 | struct var **vpp;
|
|---|
| 850 | struct var *vp;
|
|---|
| 851 |
|
|---|
| 852 | vp = find_var(s, &vpp, NULL);
|
|---|
| 853 | if (vp == NULL)
|
|---|
| 854 | return 1;
|
|---|
| 855 |
|
|---|
| 856 | if (vp->flags & VREADONLY)
|
|---|
| 857 | return (1);
|
|---|
| 858 |
|
|---|
| 859 | INTOFF;
|
|---|
| 860 | if (unexport) {
|
|---|
| 861 | vp->flags &= ~VEXPORT;
|
|---|
| 862 | } else {
|
|---|
| 863 | if (vp->text[vp->name_len + 1] != '\0')
|
|---|
| 864 | setvar(s, nullstr, 0);
|
|---|
| 865 | vp->flags &= ~VEXPORT;
|
|---|
| 866 | vp->flags |= VUNSET;
|
|---|
| 867 | if ((vp->flags & VSTRFIXED) == 0) {
|
|---|
| 868 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 869 | ckfree(vp->text);
|
|---|
| 870 | *vpp = vp->next;
|
|---|
| 871 | ckfree(vp);
|
|---|
| 872 | }
|
|---|
| 873 | }
|
|---|
| 874 | INTON;
|
|---|
| 875 | return 0;
|
|---|
| 876 | }
|
|---|
| 877 |
|
|---|
| 878 |
|
|---|
| 879 | /*
|
|---|
| 880 | * Returns true if the two strings specify the same varable. The first
|
|---|
| 881 | * variable name is terminated by '='; the second may be terminated by
|
|---|
| 882 | * either '=' or '\0'.
|
|---|
| 883 | */
|
|---|
| 884 |
|
|---|
| 885 | STATIC int
|
|---|
| 886 | strequal(const char *p, const char *q)
|
|---|
| 887 | {
|
|---|
| 888 | while (*p == *q++) {
|
|---|
| 889 | if (*p++ == '=')
|
|---|
| 890 | return 1;
|
|---|
| 891 | }
|
|---|
| 892 | if (*p == '=' && *(q - 1) == '\0')
|
|---|
| 893 | return 1;
|
|---|
| 894 | return 0;
|
|---|
| 895 | }
|
|---|
| 896 |
|
|---|
| 897 | /*
|
|---|
| 898 | * Search for a variable.
|
|---|
| 899 | * 'name' may be terminated by '=' or a NUL.
|
|---|
| 900 | * vppp is set to the pointer to vp, or the list head if vp isn't found
|
|---|
| 901 | * lenp is set to the number of charactets in 'name'
|
|---|
| 902 | */
|
|---|
| 903 |
|
|---|
| 904 | STATIC struct var *
|
|---|
| 905 | find_var(const char *name, struct var ***vppp, int *lenp)
|
|---|
| 906 | {
|
|---|
| 907 | unsigned int hashval;
|
|---|
| 908 | int len;
|
|---|
| 909 | struct var *vp, **vpp;
|
|---|
| 910 | const char *p = name;
|
|---|
| 911 |
|
|---|
| 912 | hashval = 0;
|
|---|
| 913 | while (*p && *p != '=')
|
|---|
| 914 | hashval = 2 * hashval + (unsigned char)*p++;
|
|---|
| 915 | len = p - name;
|
|---|
| 916 |
|
|---|
| 917 | if (lenp)
|
|---|
| 918 | *lenp = len;
|
|---|
| 919 | vpp = &vartab[hashval % VTABSIZE];
|
|---|
| 920 | if (vppp)
|
|---|
| 921 | *vppp = vpp;
|
|---|
| 922 |
|
|---|
| 923 | for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
|
|---|
| 924 | if (vp->name_len != len)
|
|---|
| 925 | continue;
|
|---|
| 926 | if (memcmp(vp->text, name, len) != 0)
|
|---|
| 927 | continue;
|
|---|
| 928 | if (vppp)
|
|---|
| 929 | *vppp = vpp;
|
|---|
| 930 | return vp;
|
|---|
| 931 | }
|
|---|
| 932 | return NULL;
|
|---|
| 933 | }
|
|---|
