/* Routines for dealing with '\0' separated environment vectors

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Copyright (C) 1995-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _ENVZ_H

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#define _ENVZ_H 1

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#include <features.h>

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#include <errno.h>

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/* Envz's are argz's too, and should be created etc., using the same

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routines. */

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#include <argz.h>

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__BEGIN_DECLS

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/* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none. */

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extern char *envz_entry (const char *__restrict __envz, size_t __envz_len,

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const char *__restrict __name)

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__THROW __attribute_pure__;

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/* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0

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if there is none. */

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extern char *envz_get (const char *__restrict __envz, size_t __envz_len,

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const char *__restrict __name)

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__THROW __attribute_pure__;

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/* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN. If an entry

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with the same name already exists in ENVZ, it is removed. If VALUE is

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NULL, then the new entry will a special null one, for which envz_get will

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return NULL, although envz_entry will still return an entry; this is handy

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because when merging with another envz, the null entry can override an

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entry in the other one. Null entries can be removed with envz_strip (). */

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extern error_t envz_add (char **__restrict __envz,

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size_t *__restrict __envz_len,

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const char *__restrict __name,

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const char *__restrict __value) __THROW;

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/* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add(). If

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OVERRIDE is true, then values in ENVZ2 will supersede those with the same

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name in ENV, otherwise not. */

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extern error_t envz_merge (char **__restrict __envz,

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size_t *__restrict __envz_len,

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const char *__restrict __envz2,

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size_t __envz2_len, int __override) __THROW;

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/* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any. */

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extern void envz_remove (char **__restrict __envz,

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size_t *__restrict __envz_len,

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const char *__restrict __name) __THROW;

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/* Remove null entries. */

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extern void envz_strip (char **__restrict __envz,

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size_t *__restrict __envz_len) __THROW;

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__END_DECLS

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#endif /* envz.h */

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