1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)var.h 8.1 (Berkeley) 5/31/93 37 * $Id$ 38 */ 39 40 /* 41 * Shell variables. 42 */ 43 44 /* flags */ 45 #define VEXPORT 01 /* variable is exported */ 46 #define VREADONLY 02 /* variable cannot be modified */ 47 #define VSTRFIXED 04 /* variable struct is staticly allocated */ 48 #define VTEXTFIXED 010 /* text is staticly allocated */ 49 #define VSTACK 020 /* text is allocated on the stack */ 50 #define VUNSET 040 /* the variable is not set */ 51 52 53 struct var { 54 struct var *next; /* next entry in hash list */ 55 int flags; /* flags are defined above */ 56 char *text; /* name=value */ 57 }; 58 59 60 struct localvar { 61 struct localvar *next; /* next local variable in list */ 62 struct var *vp; /* the variable that was made local */ 63 int flags; /* saved flags */ 64 char *text; /* saved text */ 65 }; 66 67 68 struct localvar *localvars; 69 70 #if ATTY 71 extern struct var vatty; 72 #endif 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 #if ATTY 80 extern struct var vterm; 81 #endif 82 83 /* 84 * The following macros access the values of the above variables. 85 * They have to skip over the name. They return the null string 86 * for unset variables. 87 */ 88 89 #define ifsval() (vifs.text + 4) 90 #define mailval() (vmail.text + 5) 91 #define mpathval() (vmpath.text + 9) 92 #define pathval() (vpath.text + 5) 93 #define ps1val() (vps1.text + 4) 94 #define ps2val() (vps2.text + 4) 95 #if ATTY 96 #define termval() (vterm.text + 5) 97 #endif 98 99 #if ATTY 100 #define attyset() ((vatty.flags & VUNSET) == 0) 101 #endif 102 #define mpathset() ((vmpath.flags & VUNSET) == 0) 103 104 105 #ifdef __STDC__ 106 void initvar(); 107 void setvar(char *, char *, int); 108 void setvareq(char *, int); 109 struct strlist; 110 void listsetvar(struct strlist *); 111 char *lookupvar(char *); 112 char *bltinlookup(char *, int); 113 char **environment(); 114 int showvarscmd(int, char **); 115 void mklocal(char *); 116 void poplocalvars(void); 117 #else 118 void initvar(); 119 void setvar(); 120 void setvareq(); 121 void listsetvar(); 122 char *lookupvar(); 123 char *bltinlookup(); 124 char **environment(); 125 int showvarscmd(); 126 void mklocal(); 127 void poplocalvars(); 128 #endif 129