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 8.2 (Berkeley) 5/4/95 37 * $FreeBSD: src/bin/sh/var.h,v 1.14 2006/06/15 07:00:49 stefanf Exp $ 38 * $DragonFly: src/bin/sh/var.h,v 1.6 2007/01/14 15:16:49 pavalos Exp $ 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 54 55 struct var { 56 struct var *next; /* next entry in hash list */ 57 int flags; /* flags are defined above */ 58 char *text; /* name=value */ 59 void (*func)(const char *); 60 /* function to be called when */ 61 /* the variable gets set/unset */ 62 }; 63 64 65 struct localvar { 66 struct localvar *next; /* next local variable in list */ 67 struct var *vp; /* the variable that was made local */ 68 int flags; /* saved flags */ 69 char *text; /* saved text */ 70 }; 71 72 73 struct localvar *localvars; 74 75 extern struct var vifs; 76 extern struct var vmail; 77 extern struct var vmpath; 78 extern struct var vpath; 79 extern struct var vppid; 80 extern struct var vps1; 81 extern struct var vps2; 82 extern struct var vps4; 83 #ifndef NO_HISTORY 84 extern struct var vhistsize; 85 #endif 86 87 /* 88 * The following macros access the values of the above variables. 89 * They have to skip over the name. They return the null string 90 * for unset variables. 91 */ 92 93 #define ifsval() (vifs.text + 4) 94 #define ifsset() ((vifs.flags & VUNSET) == 0) 95 #define mailval() (vmail.text + 5) 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 #ifndef NO_HISTORY 103 #define histsizeval() (vhistsize.text + 9) 104 #endif 105 106 #define mpathset() ((vmpath.flags & VUNSET) == 0) 107 108 void initvar(void); 109 void setvar(const char *, const char *, int); 110 void setvareq(char *, int); 111 struct strlist; 112 void listsetvar(struct strlist *); 113 char *lookupvar(const char *); 114 char *bltinlookup(const char *, int); 115 char **environment(void); 116 void shprocvar(void); 117 int showvarscmd(int, char **); 118 int exportcmd(int, char **); 119 int localcmd(int, char **); 120 void mklocal(char *); 121 void poplocalvars(void); 122 int setvarcmd(int, char **); 123 int unsetcmd(int, char **); 124 int unsetvar(const char *); 125 int setvarsafe(const char *, const char *, int); 126