1 /* $NetBSD: var.h,v 1.23 2004/10/02 12:16:53 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. 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 * @(#)var.h 8.2 (Berkeley) 5/4/95 35 */ 36 37 /* 38 * Shell variables. 39 */ 40 41 /* flags */ 42 #define VEXPORT 0x01 /* variable is exported */ 43 #define VREADONLY 0x02 /* variable cannot be modified */ 44 #define VSTRFIXED 0x04 /* variable struct is statically allocated */ 45 #define VTEXTFIXED 0x08 /* text is statically allocated */ 46 #define VSTACK 0x10 /* text is allocated on the stack */ 47 #define VUNSET 0x20 /* the variable is not set */ 48 #define VNOFUNC 0x40 /* don't call the callback function */ 49 #define VNOSET 0x80 /* do not set variable - just readonly test */ 50 51 52 struct var { 53 struct var *next; /* next entry in hash list */ 54 int flags; /* flags are defined above */ 55 char *text; /* name=value */ 56 int name_len; /* length of name */ 57 void (*func)(const char *); 58 /* function to be called when */ 59 /* the variable gets set/unset */ 60 }; 61 62 63 struct localvar { 64 struct localvar *next; /* next local variable in list */ 65 struct var *vp; /* the variable that was made local */ 66 int flags; /* saved flags */ 67 char *text; /* saved text */ 68 }; 69 70 71 struct localvar *localvars; 72 73 #if ATTY 74 extern struct var vatty; 75 #endif 76 extern struct var vifs; 77 extern struct var vmpath; 78 extern struct var vpath; 79 extern struct var vps1; 80 extern struct var vps2; 81 extern struct var vps4; 82 #ifdef WITH_HISTORY 83 extern struct var vterm; 84 extern struct var vtermcap; 85 extern struct var vhistsize; 86 #endif 87 88 /* 89 * The following macros access the values of the above variables. 90 * They have to skip over the name. They return the null string 91 * for unset variables. 92 */ 93 94 #define ifsval() (vifs.text + 4) 95 #define ifsset() ((vifs.flags & VUNSET) == 0) 96 #define mpathval() (vmpath.text + 9) 97 #define pathval() (vpath.text + 5) 98 #define ps1val() (vps1.text + 4) 99 #define ps2val() (vps2.text + 4) 100 #define ps4val() (vps4.text + 4) 101 #define optindval() (voptind.text + 7) 102 #ifdef WITH_HISTORY 103 #define histsizeval() (vhistsize.text + 9) 104 #define termval() (vterm.text + 5) 105 #endif 106 107 #if ATTY 108 #define attyset() ((vatty.flags & VUNSET) == 0) 109 #endif 110 #define mpathset() ((vmpath.flags & VUNSET) == 0) 111 112 void initvar(void); 113 void setvar(const char *, const char *, int); 114 void setvareq(char *, int); 115 struct strlist; 116 void listsetvar(struct strlist *, int); 117 char *lookupvar(const char *); 118 char *bltinlookup(const char *, int); 119 char **environment(void); 120 void shprocvar(void); 121 int showvars(const char *, int, int); 122 int exportcmd(int, char **); 123 int localcmd(int, char **); 124 void mklocal(const char *, int); 125 void listmklocal(struct strlist *, int); 126 void poplocalvars(void); 127 int setvarcmd(int, char **); 128 int unsetcmd(int, char **); 129 int unsetvar(const char *, int); 130 int setvarsafe(const char *, const char *, int); 131 void print_quoted(const char *); 132