var.h revision 200956
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: head/bin/sh/var.h 200956 2009-12-24 18:41:14Z jilles $ 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 50struct 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 60struct 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 68struct localvar *localvars; 69 70extern struct var vifs; 71extern struct var vmail; 72extern struct var vmpath; 73extern struct var vpath; 74extern struct var vppid; 75extern struct var vps1; 76extern struct var vps2; 77extern struct var vps4; 78#ifndef NO_HISTORY 79extern 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 103void initvar(void); 104void setvar(const char *, const char *, int); 105void setvareq(char *, int); 106struct strlist; 107void listsetvar(struct strlist *); 108char *lookupvar(const char *); 109char *bltinlookup(const char *, int); 110char **environment(void); 111void shprocvar(void); 112int showvarscmd(int, char **); 113int exportcmd(int, char **); 114int localcmd(int, char **); 115void mklocal(char *); 116void poplocalvars(void); 117int setvarcmd(int, char **); 118int unsetcmd(int, char **); 119int unsetvar(const char *); 120int setvarsafe(const char *, const char *, int); 121