1 /* Header for environment manipulation library. 2 Copyright 1989, 1992, 2000 Free Software Foundation, Inc. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 2 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software 16 Foundation, Inc., 59 Temple Place - Suite 330, 17 Boston, MA 02111-1307, USA. */ 18 19 #if !defined (ENVIRON_H) 20 #define ENVIRON_H 1 21 22 /* We manipulate environments represented as these structures. */ 23 24 struct environ 25 { 26 /* Number of usable slots allocated in VECTOR. 27 VECTOR always has one slot not counted here, 28 to hold the terminating zero. */ 29 int allocated; 30 /* A vector of slots, ALLOCATED + 1 of them. 31 The first few slots contain strings "VAR=VALUE" 32 and the next one contains zero. 33 Then come some unused slots. */ 34 char **vector; 35 }; 36 37 extern struct environ *make_environ (void); 38 39 extern void free_environ (struct environ *); 40 41 extern void init_environ (struct environ *); 42 43 extern char *get_in_environ (const struct environ *, const char *); 44 45 extern void set_in_environ (struct environ *, const char *, const char *); 46 47 extern void unset_in_environ (struct environ *, char *); 48 49 extern char **environ_vector (struct environ *); 50 51 #endif /* defined (ENVIRON_H) */ 52