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var.h revision 1.8 
      1 /*	$NetBSD: var.h,v 1.8 1995/03/21 09:10:38 cgd 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)var.h	8.1 (Berkeley) 5/31/93
     39  */
     40 
     41 /*
     42  * Shell variables.
     43  */
     44 
     45 /* flags */
     46 #define VEXPORT		01	/* variable is exported */
     47 #define VREADONLY	02	/* variable cannot be modified */
     48 #define VSTRFIXED	04	/* variable struct is staticly allocated */
     49 #define VTEXTFIXED	010	/* text is staticly allocated */
     50 #define VSTACK		020	/* text is allocated on the stack */
     51 #define VUNSET		040	/* the variable is not set */
     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 };
     59 
     60 
     61 struct localvar {
     62 	struct localvar *next;	/* next local variable in list */
     63 	struct var *vp;		/* the variable that was made local */
     64 	int flags;		/* saved flags */
     65 	char *text;		/* saved text */
     66 };
     67 
     68 
     69 struct localvar *localvars;
     70 
     71 #if ATTY
     72 extern struct var vatty;
     73 #endif
     74 extern struct var vifs;
     75 extern struct var vmail;
     76 extern struct var vmpath;
     77 extern struct var vpath;
     78 extern struct var vps1;
     79 extern struct var vps2;
     80 #if ATTY
     81 extern struct var vterm;
     82 #endif
     83 
     84 /*
     85  * The following macros access the values of the above variables.
     86  * They have to skip over the name.  They return the null string
     87  * for unset variables.
     88  */
     89 
     90 #define ifsval()	(vifs.text + 4)
     91 #define mailval()	(vmail.text + 5)
     92 #define mpathval()	(vmpath.text + 9)
     93 #define pathval()	(vpath.text + 5)
     94 #define ps1val()	(vps1.text + 4)
     95 #define ps2val()	(vps2.text + 4)
     96 #if ATTY
     97 #define termval()	(vterm.text + 5)
     98 #endif
     99 
    100 #if ATTY
    101 #define attyset()	((vatty.flags & VUNSET) == 0)
    102 #endif
    103 #define mpathset()	((vmpath.flags & VUNSET) == 0)
    104 
    105 
    106 #ifdef __STDC__
    107 void initvar();
    108 void setvar(char *, char *, int);
    109 void setvareq(char *, int);
    110 struct strlist;
    111 void listsetvar(struct strlist *);
    112 char *lookupvar(char *);
    113 char *bltinlookup(char *, int);
    114 char **environment();
    115 int showvarscmd(int, char **);
    116 void mklocal(char *);
    117 void poplocalvars(void);
    118 int unsetcmd(int, char **);
    119 #else
    120 void initvar();
    121 void setvar();
    122 void setvareq();
    123 void listsetvar();
    124 char *lookupvar();
    125 char *bltinlookup();
    126 char **environment();
    127 int showvarscmd();
    128 void mklocal();
    129 void poplocalvars();
    130 int unsetcmd();
    131 #endif
    132