text: /*	$NetBSD: var.h,v 1.23 2004/10/02 12:16:53 dsl Exp $	*/
  
  /*-
   * Copyright (c) 1991, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Kenneth Almquist.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)var.h	8.2 (Berkeley) 5/4/95
   */
  
  /*
   * Shell variables.
   */
  
  /* flags */
  #define VEXPORT		0x01	/* variable is exported */
  #define VREADONLY	0x02	/* variable cannot be modified */
  #define VSTRFIXED	0x04	/* variable struct is statically allocated */
  #define VTEXTFIXED	0x08	/* text is statically allocated */
  #define VSTACK		0x10	/* text is allocated on the stack */
  #define VUNSET		0x20	/* the variable is not set */
  #define VNOFUNC		0x40	/* don't call the callback function */
  #define VNOSET		0x80	/* do not set variable - just readonly test */
  
  
  struct var {
  	struct var *next;		/* next entry in hash list */
  	int flags;			/* flags are defined above */
  	char *text;			/* name=value */
  	int name_len;			/* length of name */
  	void (*func)(const char *);
  					/* function to be called when  */
  					/* the variable gets set/unset */
  };
  
  
  struct localvar {
  	struct localvar *next;		/* next local variable in list */
  	struct var *vp;			/* the variable that was made local */
  	int flags;			/* saved flags */
  	char *text;			/* saved text */
  };
  
  
  struct localvar *localvars;
  
  #if ATTY
  extern struct var vatty;
  #endif
  extern struct var vifs;
  extern struct var vmpath;
  extern struct var vpath;
  extern struct var vps1;
  extern struct var vps2;
  extern struct var vps4;
  #ifdef WITH_HISTORY 
  extern struct var vterm;
  extern struct var vtermcap;
  extern struct var vhistsize;
  #endif
  
  /*
   * The following macros access the values of the above variables.
   * They have to skip over the name.  They return the null string
   * for unset variables.
   */
  
  #define ifsval()	(vifs.text + 4)
  #define ifsset()	((vifs.flags & VUNSET) == 0)
  #define mpathval()	(vmpath.text + 9)
  #define pathval()	(vpath.text + 5)
  #define ps1val()	(vps1.text + 4)
  #define ps2val()	(vps2.text + 4)
  #define ps4val()	(vps4.text + 4)
  #define optindval()	(voptind.text + 7)
  #ifdef WITH_HISTORY
  #define histsizeval()	(vhistsize.text + 9)
  #define termval()	(vterm.text + 5)
  #endif
  
  #if ATTY
  #define attyset()	((vatty.flags & VUNSET) == 0)
  #endif
  #define mpathset()	((vmpath.flags & VUNSET) == 0)
  
  void initvar(void);
  void setvar(const char *, const char *, int);
  void setvareq(char *, int);
  struct strlist;
  void listsetvar(struct strlist *, int);
  char *lookupvar(const char *);
  char *bltinlookup(const char *, int);
  char **environment(void);
  void shprocvar(void);
  int showvars(const char *, int, int);
  int exportcmd(int, char **);
  int localcmd(int, char **);
  void mklocal(const char *, int);
  void listmklocal(struct strlist *, int);
  void poplocalvars(void);
  int setvarcmd(int, char **);
  int unsetcmd(int, char **);
  int unsetvar(const char *, int);
  int setvarsafe(const char *, const char *, int);
  void print_quoted(const char *);
  