text: /* Routines for dealing with '\0' separated environment vectors
     Copyright (C) 1995, 96, 98, 99, 2000 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, write to the Free
     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     02111-1307 USA.  */
  
  #ifndef _ENVZ_H
  #define _ENVZ_H	1
  
  #include <features.h>
  
  #include <errno.h>
  
  /* Envz's are argz's too, and should be created etc., using the same
     routines.  */
  #include <argz.h>
  
  __BEGIN_DECLS
  
  /* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none.  */
  extern char *envz_entry (__const char *__restrict __envz, size_t __envz_len,
  			 __const char *__restrict __name)
       __THROW __attribute_pure__;
  
  /* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0
     if there is none.  */
  extern char *envz_get (__const char *__restrict __envz, size_t __envz_len,
  		       __const char *__restrict __name)
       __THROW __attribute_pure__;
  
  /* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN.  If an entry
     with the same name already exists in ENVZ, it is removed.  If VALUE is
     NULL, then the new entry will a special null one, for which envz_get will
     return NULL, although envz_entry will still return an entry; this is handy
     because when merging with another envz, the null entry can override an
     entry in the other one.  Null entries can be removed with envz_strip ().  */
  extern error_t envz_add (char **__restrict __envz,
  			 size_t *__restrict __envz_len,
  			 __const char *__restrict __name,
  			 __const char *__restrict __value) __THROW;
  
  /* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add().  If
     OVERRIDE is true, then values in ENVZ2 will supersede those with the same
     name in ENV, otherwise not.  */
  extern error_t envz_merge (char **__restrict __envz,
  			   size_t *__restrict __envz_len,
  			   __const char *__restrict __envz2,
  			   size_t __envz2_len, int __override) __THROW;
  
  /* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any.  */
  extern void envz_remove (char **__restrict __envz,
  			 size_t *__restrict __envz_len,
  			 __const char *__restrict __name) __THROW;
  
  /* Remove null entries.  */
  extern void envz_strip (char **__restrict __envz,
  			size_t *__restrict __envz_len) __THROW;
  
  __END_DECLS
  
  #endif /* envz.h */
  