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var.h revision 1.12 
      1 /*	$NetBSD: var.h,v 1.12 1996/11/02 18:26:05 christos 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	8.2 (Berkeley) 5/4/95
     39  */
     40 
     41 /*
     42  * Shell variables.
     43  */
     44 
     45 /* flags */
     46 #define VEXPORT		0x01	/* variable is exported */
     47 #define VREADONLY	0x02	/* variable cannot be modified */
     48 #define VSTRFIXED	0x04	/* variable struct is staticly allocated */
     49 #define VTEXTFIXED	0x08	/* text is staticly allocated */
     50 #define VSTACK		0x10	/* text is allocated on the stack */
     51 #define VUNSET		0x20	/* the variable is not set */
     52 #define VNOFUNC		0x40	/* don't call the callback function */
     53 
     54 
     55 struct var {
     56 	struct var *next;		/* next entry in hash list */
     57 	int flags;			/* flags are defined above */
     58 	char *text;			/* name=value */
     59 	void (*func) __P((const char *));
     60 					/* function to be called when  */
     61 					/* the variable gets set/unset */
     62 };
     63 
     64 
     65 struct localvar {
     66 	struct localvar *next;		/* next local variable in list */
     67 	struct var *vp;			/* the variable that was made local */
     68 	int flags;			/* saved flags */
     69 	char *text;			/* saved text */
     70 };
     71 
     72 
     73 struct localvar *localvars;
     74 
     75 #if ATTY
     76 extern struct var vatty;
     77 #endif
     78 extern struct var vifs;
     79 extern struct var vmail;
     80 extern struct var vmpath;
     81 extern struct var vpath;
     82 extern struct var vps1;
     83 extern struct var vps2;
     84 #if ATTY
     85 extern struct var vterm;
     86 #endif
     87 #ifndef NO_HISTORY
     88 extern struct var vhistsize;
     89 #endif
     90 
     91 /*
     92  * The following macros access the values of the above variables.
     93  * They have to skip over the name.  They return the null string
     94  * for unset variables.
     95  */
     96 
     97 #define ifsval()	(vifs.text + 4)
     98 #define mailval()	(vmail.text + 5)
     99 #define mpathval()	(vmpath.text + 9)
    100 #define pathval()	(vpath.text + 5)
    101 #define ps1val()	(vps1.text + 4)
    102 #define ps2val()	(vps2.text + 4)
    103 #if ATTY
    104 #define termval()	(vterm.text + 5)
    105 #endif
    106 #define optindval()	(voptind.text + 7)
    107 #ifndef NO_HISTORY
    108 #define histsizeval()	(vhistsize.text + 9)
    109 #endif
    110 
    111 #if ATTY
    112 #define attyset()	((vatty.flags & VUNSET) == 0)
    113 #endif
    114 #define mpathset()	((vmpath.flags & VUNSET) == 0)
    115 
    116 void initvar __P((void));
    117 void setvar __P((char *, char *, int));
    118 void setvareq __P((char *, int));
    119 struct strlist;
    120 void listsetvar __P((struct strlist *));
    121 char *lookupvar __P((char *));
    122 char *bltinlookup __P((char *, int));
    123 char **environment __P((void));
    124 void shprocvar __P((void));
    125 int showvarscmd __P((int, char **));
    126 int exportcmd __P((int, char **));
    127 int localcmd __P((int, char **));
    128 void mklocal __P((char *));
    129 void poplocalvars __P((void));
    130 int setvarcmd __P((int, char **));
    131 int unsetcmd __P((int, char **));
    132 int unsetvar __P((char *));
    133 int setvarsafe __P((char *, char *, int));
    134