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var.h revision 1.6 
      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  *	from: @(#)var.h	8.1 (Berkeley) 5/31/93
     37  *	$Id: var.h,v 1.6 1994/06/11 16:12:40 mycroft Exp $
     38  */
     39 
     40 /*
     41  * Shell variables.
     42  */
     43 
     44 /* flags */
     45 #define VEXPORT		01	/* variable is exported */
     46 #define VREADONLY	02	/* variable cannot be modified */
     47 #define VSTRFIXED	04	/* variable struct is staticly allocated */
     48 #define VTEXTFIXED	010	/* text is staticly allocated */
     49 #define VSTACK		020	/* text is allocated on the stack */
     50 #define VUNSET		040	/* the variable is not set */
     51 
     52 
     53 struct var {
     54 	struct var *next;		/* next entry in hash list */
     55 	int flags;		/* flags are defined above */
     56 	char *text;		/* name=value */
     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 #if ATTY
     71 extern struct var vatty;
     72 #endif
     73 extern struct var vifs;
     74 extern struct var vmail;
     75 extern struct var vmpath;
     76 extern struct var vpath;
     77 extern struct var vps1;
     78 extern struct var vps2;
     79 #if ATTY
     80 extern struct var vterm;
     81 #endif
     82 
     83 /*
     84  * The following macros access the values of the above variables.
     85  * They have to skip over the name.  They return the null string
     86  * for unset variables.
     87  */
     88 
     89 #define ifsval()	(vifs.text + 4)
     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 #if ATTY
     96 #define termval()	(vterm.text + 5)
     97 #endif
     98 
     99 #if ATTY
    100 #define attyset()	((vatty.flags & VUNSET) == 0)
    101 #endif
    102 #define mpathset()	((vmpath.flags & VUNSET) == 0)
    103 
    104 
    105 #ifdef __STDC__
    106 void initvar();
    107 void setvar(char *, char *, int);
    108 void setvareq(char *, int);
    109 struct strlist;
    110 void listsetvar(struct strlist *);
    111 char *lookupvar(char *);
    112 char *bltinlookup(char *, int);
    113 char **environment();
    114 int showvarscmd(int, char **);
    115 void mklocal(char *);
    116 void poplocalvars(void);
    117 #else
    118 void initvar();
    119 void setvar();
    120 void setvareq();
    121 void listsetvar();
    122 char *lookupvar();
    123 char *bltinlookup();
    124 char **environment();
    125 int showvarscmd();
    126 void mklocal();
    127 void poplocalvars();
    128 #endif
    129