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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)var.h 8.2 (Berkeley) 5/4/95 33 * $FreeBSD$ 34 */ 35 36 /* 37 * Shell variables. 38 */ 39 40 /* flags */ 41 #define VEXPORT 0x01 /* variable is exported */ 42 #define VREADONLY 0x02 /* variable cannot be modified */ 43 #define VSTRFIXED 0x04 /* variable struct is statically allocated */ 44 #define VTEXTFIXED 0x08 /* text is statically allocated */ 45 #define VSTACK 0x10 /* text is allocated on the stack */ 46 #define VUNSET 0x20 /* the variable is not set */ 47 #define VNOFUNC 0x40 /* don't call the callback function */ 48 49 50 struct var { 51 struct var *next; /* next entry in hash list */ 52 int flags; /* flags are defined above */ 53 char *text; /* name=value */ 54 void (*func)(const char *); 55 /* function to be called when */ 56 /* the variable gets set/unset */ 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 extern struct var vifs; 71 extern struct var vmail; 72 extern struct var vmpath; 73 extern struct var vpath; 74 extern struct var vppid; 75 extern struct var vps1; 76 extern struct var vps2; 77 extern struct var vps4; 78 #ifndef NO_HISTORY 79 extern struct var vhistsize; 80 #endif 81 82 /* 83 * The following macros access the values of the above variables. 84 * They have to skip over the name. They return the null string 85 * for unset variables. 86 */ 87 88 #define ifsval() (vifs.text + 4) 89 #define ifsset() ((vifs.flags & VUNSET) == 0) 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 #define ps4val() (vps4.text + 4) 96 #define optindval() (voptind.text + 7) 97 #ifndef NO_HISTORY 98 #define histsizeval() (vhistsize.text + 9) 99 #endif 100 101 #define mpathset() ((vmpath.flags & VUNSET) == 0) 102 103 void initvar(void); 104 void setvar(char *, char *, int); 105 void setvareq(char *, int); 106 struct strlist; 107 void listsetvar(struct strlist *); 108 char *lookupvar(char *); 109 char *bltinlookup(char *, int); 110 char **environment(void); 111 void shprocvar(void); 112 int showvarscmd(int, char **); 113 int exportcmd(int, char **); 114 int localcmd(int, char **); 115 void mklocal(char *); 116 void poplocalvars(void); 117 int setvarcmd(int, char **); 118 int unsetcmd(int, char **); 119 int unsetvar(char *); 120 int setvarsafe(char *, char *, int); 121