Edit: envz.h
/* Routines for dealing with '\0' separated environment vectors Copyright (C) 1995-2018 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, see <http://www.gnu.org/licenses/>. */ #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 */
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