1 /* $NetBSD: var.h,v 1.21 2003/01/22 20:36:04 dsl Exp $ */ 2 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)var.h 8.2 (Berkeley) 5/4/95 39 */ 40 41 /* 42 * Shell variables. 43 */ 44 45 /* flags */ 46 #define VEXPORT 0x01 /* variable is exported */ 47 #define VREADONLY 0x02 /* variable cannot be modified */ 48 #define VSTRFIXED 0x04 /* variable struct is statically allocated */ 49 #define VTEXTFIXED 0x08 /* text is statically allocated */ 50 #define VSTACK 0x10 /* text is allocated on the stack */ 51 #define VUNSET 0x20 /* the variable is not set */ 52 #define VNOFUNC 0x40 /* don't call the callback function */ 53 #define VNOSET 0x80 /* do not set variable - just readonly test */ 54 55 56 struct var { 57 struct var *next; /* next entry in hash list */ 58 int flags; /* flags are defined above */ 59 char *text; /* name=value */ 60 void (*func)(const char *); 61 /* function to be called when */ 62 /* the variable gets set/unset */ 63 }; 64 65 66 struct localvar { 67 struct localvar *next; /* next local variable in list */ 68 struct var *vp; /* the variable that was made local */ 69 int flags; /* saved flags */ 70 char *text; /* saved text */ 71 }; 72 73 74 struct localvar *localvars; 75 76 #if ATTY 77 extern struct var vatty; 78 #endif 79 extern struct var vifs; 80 extern struct var vmail; 81 extern struct var vmpath; 82 extern struct var vpath; 83 extern struct var vps1; 84 extern struct var vps2; 85 extern struct var vps4; 86 #ifndef SMALL 87 extern struct var vterm; 88 extern struct var vtermcap; 89 extern struct var vhistsize; 90 #endif 91 92 /* 93 * The following macros access the values of the above variables. 94 * They have to skip over the name. They return the null string 95 * for unset variables. 96 */ 97 98 #define ifsval() (vifs.text + 4) 99 #define ifsset() ((vifs.flags & VUNSET) == 0) 100 #define mailval() (vmail.text + 5) 101 #define mpathval() (vmpath.text + 9) 102 #define pathval() (vpath.text + 5) 103 #define ps1val() (vps1.text + 4) 104 #define ps2val() (vps2.text + 4) 105 #define ps4val() (vps4.text + 4) 106 #define optindval() (voptind.text + 7) 107 #ifndef SMALL 108 #define histsizeval() (vhistsize.text + 9) 109 #define termval() (vterm.text + 5) 110 #endif 111 112 #if ATTY 113 #define attyset() ((vatty.flags & VUNSET) == 0) 114 #endif 115 #define mpathset() ((vmpath.flags & VUNSET) == 0) 116 117 void initvar(void); 118 void setvar(const char *, const char *, int); 119 void setvareq(char *, int); 120 struct strlist; 121 void listsetvar(struct strlist *, int); 122 char *lookupvar(const char *); 123 char *bltinlookup(const char *, int); 124 char **environment(void); 125 void shprocvar(void); 126 int showvars(const char *, int, int); 127 int exportcmd(int, char **); 128 int localcmd(int, char **); 129 void mklocal(const char *, int); 130 void listmklocal(struct strlist *, int); 131 void poplocalvars(void); 132 int setvarcmd(int, char **); 133 int unsetcmd(int, char **); 134 int unsetvar(const char *, int); 135 int setvarsafe(const char *, const char *, int); 136 void print_quoted(const char *); 137