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var.h revision 1.1 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * 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	5.1 (Berkeley) 3/7/91
     37  */
     38 
     39 /*
     40  * Shell variables.
     41  */
     42 
     43 /* flags */
     44 #define VEXPORT		01	/* variable is exported */
     45 #define VREADONLY	02	/* variable cannot be modified */
     46 #define VSTRFIXED	04	/* variable struct is staticly allocated */
     47 #define VTEXTFIXED	010	/* text is staticly allocated */
     48 #define VSTACK		020	/* text is allocated on the stack */
     49 #define VUNSET		040	/* the variable is not set */
     50 
     51 
     52 struct var {
     53 	struct var *next;		/* next entry in hash list */
     54 	int flags;		/* flags are defined above */
     55 	char *text;		/* name=value */
     56 };
     57 
     58 
     59 struct localvar {
     60 	struct localvar *next;	/* next local variable in list */
     61 	struct var *vp;		/* the variable that was made local */
     62 	int flags;		/* saved flags */
     63 	char *text;		/* saved text */
     64 };
     65 
     66 
     67 struct localvar *localvars;
     68 
     69 #if ATTY
     70 extern struct var vatty;
     71 #endif
     72 extern struct var vifs;
     73 extern struct var vmail;
     74 extern struct var vmpath;
     75 extern struct var vpath;
     76 extern struct var vps1;
     77 extern struct var vps2;
     78 #if ATTY
     79 extern struct var vterm;
     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 mailval()	(vmail.text + 5)
     90 #define mpathval()	(vmpath.text + 9)
     91 #define pathval()	(vpath.text + 5)
     92 #define ps1val()	(vps1.text + 4)
     93 #define ps2val()	(vps2.text + 4)
     94 #if ATTY
     95 #define termval()	(vterm.text + 5)
     96 #endif
     97 
     98 #if ATTY
     99 #define attyset()	((vatty.flags & VUNSET) == 0)
    100 #endif
    101 #define mpathset()	((vmpath.flags & VUNSET) == 0)
    102 
    103 
    104 #ifdef __STDC__
    105 void initvar();
    106 void setvar(char *, char *, int);
    107 void setvareq(char *, int);
    108 struct strlist;
    109 void listsetvar(struct strlist *);
    110 char *lookupvar(char *);
    111 char *bltinlookup(char *, int);
    112 char **environment();
    113 int showvarscmd(int, char **);
    114 void mklocal(char *);
    115 void poplocalvars(void);
    116 #else
    117 void initvar();
    118 void setvar();
    119 void setvareq();
    120 void listsetvar();
    121 char *lookupvar();
    122 char *bltinlookup();
    123 char **environment();
    124 int showvarscmd();
    125 void mklocal();
    126 void poplocalvars();
    127 #endif
    128