1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35/* 36 * Shell variables. 37 */ 38 39/* flags */ 40#define VEXPORT 0x01 /* variable is exported */ 41#define VREADONLY 0x02 /* variable cannot be modified */ 42#define VSTRFIXED 0x04 /* variable struct is statically allocated */ 43#define VTEXTFIXED 0x08 /* text is statically allocated */ 44#define VSTACK 0x10 /* text is allocated on the stack */ 45#define VUNSET 0x20 /* the variable is not set */ 46#define VNOFUNC 0x40 /* don't call the callback function */ 47#define VNOSET 0x80 /* do not set variable - just readonly test */ 48#define VNOLOCAL 0x100 /* ignore forcelocal */ 49 50 51struct var { 52 struct var *next; /* next entry in hash list */ 53 int flags; /* flags are defined above */ 54 int name_len; /* length of name */ 55 char *text; /* name=value */ 56 void (*func)(const char *); 57 /* function to be called when */ 58 /* the variable gets set/unset */ 59}; 60 61 62struct localvar { 63 struct localvar *next; /* next local variable in list */ 64 struct var *vp; /* the variable that was made local */ 65 int flags; /* saved flags */ 66 char *text; /* saved text */ 67}; 68 69 70extern struct localvar *localvars; 71extern int forcelocal; 72 73extern struct var vifs; 74extern struct var vmail; 75extern struct var vmpath; 76extern struct var vpath; 77extern struct var vps1; 78extern struct var vps2; 79extern struct var vps4; 80extern struct var vdisvfork; 81#ifndef NO_HISTORY 82extern struct var vhistsize; 83extern struct var vterm; 84#endif 85 86extern int localeisutf8; 87/* The parser uses the locale that was in effect at startup. */ 88extern int initial_localeisutf8; 89 90/* 91 * The following macros access the values of the above variables. 92 * They have to skip over the name. They return the null string 93 * for unset variables. 94 */ 95 96#define ifsval() (vifs.text + 4) 97#define ifsset() ((vifs.flags & VUNSET) == 0) 98#define mailval() (vmail.text + 5) 99#define mpathval() (vmpath.text + 9) 100#define pathval() (vpath.text + 5) 101#define ps1val() (vps1.text + 4) 102#define ps2val() (vps2.text + 4) 103#define ps4val() (vps4.text + 4) 104#define optindval() (voptind.text + 7) 105#ifndef NO_HISTORY 106#define histsizeval() (vhistsize.text + 9) 107#define termval() (vterm.text + 5) 108#endif 109 110#define mpathset() ((vmpath.flags & VUNSET) == 0) 111#define disvforkset() ((vdisvfork.flags & VUNSET) == 0) 112 113void initvar(void); 114void setvar(const char *, const char *, int); 115void setvareq(char *, int); 116struct arglist; 117void listsetvar(struct arglist *, int); 118char *lookupvar(const char *); 119char *bltinlookup(const char *, int); 120void bltinsetlocale(void); 121void bltinunsetlocale(void); 122void updatecharset(void); 123void initcharset(void); 124char **environment(void); 125int showvarscmd(int, char **); 126void mklocal(char *); 127void poplocalvars(void); 128int unsetvar(const char *); 129int setvarsafe(const char *, const char *, int); 130