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 51 struct 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 62 struct 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 70 extern struct localvar *localvars; 71 extern int forcelocal; 72 73 extern struct var vifs; 74 extern struct var vmail; 75 extern struct var vmpath; 76 extern struct var vpath; 77 extern struct var vps1; 78 extern struct var vps2; 79 extern struct var vps4; 80 extern struct var vdisvfork; 81 #ifndef NO_HISTORY 82 extern struct var vhistsize; 83 extern struct var vterm; 84 #endif 85 86 extern int localeisutf8; 87 /* The parser uses the locale that was in effect at startup. */ 88 extern 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) 112 113 void initvar(void); 114 void setvar(const char *, const char *, int); 115 void setvareq(char *, int); 116 struct arglist; 117 void listsetvar(struct arglist *, int); 118 char *lookupvar(const char *); 119 char *bltinlookup(const char *, int); 120 void bltinsetlocale(void); 121 void bltinunsetlocale(void); 122 void updatecharset(void); 123 void initcharset(void); 124 char **environment(void); 125 int showvarscmd(int, char **); 126 void mklocal(char *); 127 void poplocalvars(void); 128 int unsetvar(const char *); 129 int setvarsafe(const char *, const char *, int); 130