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var.h revision 1.21 
      1 /*	$NetBSD: var.h,v 1.21 2003/01/22 20:36:04 dsl 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 statically allocated */
     49 #define VTEXTFIXED	0x08	/* text is statically 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 #define VNOSET		0x80	/* do not set variable - just readonly test */
     54 
     55 
     56 struct var {
     57 	struct var *next;		/* next entry in hash list */
     58 	int flags;			/* flags are defined above */
     59 	char *text;			/* name=value */
     60 	void (*func)(const char *);
     61 					/* function to be called when  */
     62 					/* the variable gets set/unset */
     63 };
     64 
     65 
     66 struct localvar {
     67 	struct localvar *next;		/* next local variable in list */
     68 	struct var *vp;			/* the variable that was made local */
     69 	int flags;			/* saved flags */
     70 	char *text;			/* saved text */
     71 };
     72 
     73 
     74 struct localvar *localvars;
     75 
     76 #if ATTY
     77 extern struct var vatty;
     78 #endif
     79 extern struct var vifs;
     80 extern struct var vmail;
     81 extern struct var vmpath;
     82 extern struct var vpath;
     83 extern struct var vps1;
     84 extern struct var vps2;
     85 extern struct var vps4;
     86 #ifndef SMALL
     87 extern struct var vterm;
     88 extern struct var vtermcap;
     89 extern struct var vhistsize;
     90 #endif
     91 
     92 /*
     93  * The following macros access the values of the above variables.
     94  * They have to skip over the name.  They return the null string
     95  * for unset variables.
     96  */
     97 
     98 #define ifsval()	(vifs.text + 4)
     99 #define ifsset()	((vifs.flags & VUNSET) == 0)
    100 #define mailval()	(vmail.text + 5)
    101 #define mpathval()	(vmpath.text + 9)
    102 #define pathval()	(vpath.text + 5)
    103 #define ps1val()	(vps1.text + 4)
    104 #define ps2val()	(vps2.text + 4)
    105 #define ps4val()	(vps4.text + 4)
    106 #define optindval()	(voptind.text + 7)
    107 #ifndef SMALL
    108 #define histsizeval()	(vhistsize.text + 9)
    109 #define termval()	(vterm.text + 5)
    110 #endif
    111 
    112 #if ATTY
    113 #define attyset()	((vatty.flags & VUNSET) == 0)
    114 #endif
    115 #define mpathset()	((vmpath.flags & VUNSET) == 0)
    116 
    117 void initvar(void);
    118 void setvar(const char *, const char *, int);
    119 void setvareq(char *, int);
    120 struct strlist;
    121 void listsetvar(struct strlist *, int);
    122 char *lookupvar(const char *);
    123 char *bltinlookup(const char *, int);
    124 char **environment(void);
    125 void shprocvar(void);
    126 int showvars(const char *, int, int);
    127 int exportcmd(int, char **);
    128 int localcmd(int, char **);
    129 void mklocal(const char *, int);
    130 void listmklocal(struct strlist *, int);
    131 void poplocalvars(void);
    132 int setvarcmd(int, char **);
    133 int unsetcmd(int, char **);
    134 int unsetvar(const char *, int);
    135 int setvarsafe(const char *, const char *, int);
    136 void print_quoted(const char *);
    137