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+/* Header for environment manipulation library.
+ Copyright 1989, 1992 Free Software Foundation.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if !defined (ENVIRON_H)
+#define ENVIRON_H 1
+
+/* We manipulate environments represented as these structures. */
+
+struct environ
+{
+ /* Number of usable slots allocated in VECTOR.
+ VECTOR always has one slot not counted here,
+ to hold the terminating zero. */
+ int allocated;
+ /* A vector of slots, ALLOCATED + 1 of them.
+ The first few slots contain strings "VAR=VALUE"
+ and the next one contains zero.
+ Then come some unused slots. */
+ char **vector;
+};
+
+extern struct environ *
+make_environ PARAMS ((void));
+
+extern void
+free_environ PARAMS ((struct environ *));
+
+extern void
+init_environ PARAMS ((struct environ *));
+
+extern char *
+get_in_environ PARAMS ((const struct environ *, const char *));
+
+extern void
+set_in_environ PARAMS ((struct environ *, const char *,
+ const char *));
+
+extern void
+unset_in_environ PARAMS ((struct environ *, char *));
+
+extern char **
+environ_vector PARAMS ((struct environ *));
+
+#endif /* defined (ENVIRON_H) */