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 * $Id: var.h,v 1.3 1996/09/01 10:21:54 peter Exp $ 38 */ 39 40 /* 41 * Shell variables. 42 */ 43 44 /* flags */ 45 #define VEXPORT 0x01 /* variable is exported */ 46 #define VREADONLY 0x02 /* variable cannot be modified */ 47 #define VSTRFIXED 0x04 /* variable struct is staticly allocated */ 48 #define VTEXTFIXED 0x08 /* text is staticly allocated */ 49 #define VSTACK 0x10 /* text is allocated on the stack */ 50 #define VUNSET 0x20 /* the variable is not set */ 51 #define VNOFUNC 0x40 /* don't call the callback function */ 52 53 54 struct var { 55 struct var *next; /* next entry in hash list */ 56 int flags; /* flags are defined above */ 57 char *text; /* name=value */ 58 void (*func) __P((const char *)); 59 /* function to be called when */ 60 /* the variable gets set/unset */ 61 }; 62 63 64 struct localvar { 65 struct localvar *next; /* next local variable in list */ 66 struct var *vp; /* the variable that was made local */ 67 int flags; /* saved flags */ 68 char *text; /* saved text */ 69 }; 70 71 72 struct localvar *localvars; 73 74 #if ATTY 75 extern struct var vatty; 76 #endif 77 extern struct var vifs; 78 extern struct var vmail; 79 extern struct var vmpath; 80 extern struct var vpath; 81 extern struct var vps1; 82 extern struct var vps2; 83 #if ATTY 84 extern struct var vterm; 85 #endif 86 #ifndef NO_HISTORY 87 extern struct var vhistsize; 88 #endif 89 90 /* 91 * The following macros access the values of the above variables. 92 * They have to skip over the name. They return the null string 93 * for unset variables. 94 */ 95 96 #define ifsval() (vifs.text + 4) 97 #define mailval() (vmail.text + 5) 98 #define mpathval() (vmpath.text + 9) 99 #define pathval() (vpath.text + 5) 100 #define ps1val() (vps1.text + 4) 101 #define ps2val() (vps2.text + 4) 102 #if ATTY 103 #define termval() (vterm.text + 5) 104 #endif 105 #define optindval() (voptind.text + 7) 106 #ifndef NO_HISTORY 107 #define histsizeval() (vhistsize.text + 9) 108 #endif 109 110 #if ATTY 111 #define attyset() ((vatty.flags & VUNSET) == 0) 112 #endif 113 #define mpathset() ((vmpath.flags & VUNSET) == 0) 114 115 void initvar __P((void)); 116 void setvar __P((char *, char *, int)); 117 void setvareq __P((char *, int)); 118 struct strlist; 119 void listsetvar __P((struct strlist *)); 120 char *lookupvar __P((char *)); 121 char *bltinlookup __P((char *, int)); 122 char **environment __P((void)); 123 void shprocvar __P((void)); 124 int showvarscmd __P((int, char **)); 125 int exportcmd __P((int, char **)); 126 int localcmd __P((int, char **)); 127 void mklocal __P((char *)); 128 void poplocalvars __P((void)); 129 int setvarcmd __P((int, char **)); 130 int unsetcmd __P((int, char **)); 131 int unsetvar __P((char *)); 132 int setvarsafe __P((char *, char *, int)); 133