text: /*-
   * Copyright (c) 1991, 1993
   *	The Regents of the University of California.  All rights reserved.
   * Copyright (c) 1997-2005
   *	Herbert Xu <herbert@gondor.apana.org.au>.  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
   */
  
  #include <inttypes.h>
  
  /*
   * 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 */
  #define VNOSAVE		0x100	/* when text is on the heap before setvareq */
  
  
  struct var {
  	struct var *next;		/* next entry in hash list */
  	int flags;			/* flags are defined above */
  	const char *text;		/* name=value */
  	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 */
  	const char *text;		/* saved text */
  };
  
  struct localvar_list;
  
  
  extern struct localvar *localvars;
  extern struct var varinit[];
  
  #if ATTY
  #define vatty varinit[0]
  #define vifs varinit[1]
  #else
  #define vifs varinit[0]
  #endif
  #define vpath (&vifs)[1]
  #define vps1 (&vpath)[1]
  #define vps2 (&vps1)[1]
  #define vps4 (&vps2)[1]
  #define voptind (&vps4)[1]
  #ifdef WITH_LINENO
  #define vlineno (&voptind)[1]
  #endif
  
  #ifdef IFS_BROKEN
  extern const char defifsvar[];
  #define defifs (defifsvar + 4)
  #else
  extern const char defifs[];
  #endif
  extern const char defpathvar[];
  #define defpath (&defpathvar[sizeof("PATH=") - 1])
  
  extern int lineno;
  extern char linenovar[];
  
  /*
   * 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 mailval()	(vmail.text + 5)
  #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)
  #define linenoval()	(vlineno.text + 7)
  
  #if ATTY
  #define attyset()	((vatty.flags & VUNSET) == 0)
  #endif
  #define mpathset()	((vmpath.flags & VUNSET) == 0)
  
  void initvar(void);
  struct var *setvar(const char *name, const char *val, int flags);
  intmax_t setvarint(const char *, intmax_t, int);
  struct var *setvareq(char *s, int flags);
  struct strlist;
  void listsetvar(struct strlist *, int);
  char *lookupvar(const char *);
  intmax_t lookupvarint(const char *);
  char **listvars(int, int, char ***);
  #define environment() listvars(VEXPORT, VUNSET, 0)
  int showvars(const char *, int, int);
  int exportcmd(int, char **);
  int localcmd(int, char **);
  void mklocal(char *);
  struct localvar_list *pushlocalvars(void);
  void poplocalvars(int);
  void unwindlocalvars(struct localvar_list *stop);
  int unsetcmd(int, char **);
  void unsetvar(const char *);
  int varcmp(const char *, const char *);
  
  static inline int varequal(const char *a, const char *b) {
  	return !varcmp(a, b);
  }
  
  /*
   * Search the environment of a builtin command.
   */
  
  static inline char *bltinlookup(const char *name)
  {
  	return lookupvar(name);
  }
  
  
  