1 /* Routines for dealing with '\0' separated environment vectors 2 Copyright (C) 1995, 96, 98, 99, 2000 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _ENVZ_H 21 #define _ENVZ_H 1 22 23 #include <features.h> 24 25 #include <errno.h> 26 27 /* Envz's are argz's too, and should be created etc., using the same 28 routines. */ 29 #include <argz.h> 30 31 __BEGIN_DECLS 32 33 /* Returns a pointer to the entry in ENVZ for NAME, or 0 if there is none. */ 34 extern char *envz_entry (__const char *__restrict __envz, size_t __envz_len, 35 __const char *__restrict __name) 36 __THROW __attribute_pure__; 37 38 /* Returns a pointer to the value portion of the entry in ENVZ for NAME, or 0 39 if there is none. */ 40 extern char *envz_get (__const char *__restrict __envz, size_t __envz_len, 41 __const char *__restrict __name) 42 __THROW __attribute_pure__; 43 44 /* Adds an entry for NAME with value VALUE to ENVZ & ENVZ_LEN. If an entry 45 with the same name already exists in ENVZ, it is removed. If VALUE is 46 NULL, then the new entry will a special null one, for which envz_get will 47 return NULL, although envz_entry will still return an entry; this is handy 48 because when merging with another envz, the null entry can override an 49 entry in the other one. Null entries can be removed with envz_strip (). */ 50 extern error_t envz_add (char **__restrict __envz, 51 size_t *__restrict __envz_len, 52 __const char *__restrict __name, 53 __const char *__restrict __value) __THROW; 54 55 /* Adds each entry in ENVZ2 to ENVZ & ENVZ_LEN, as if with envz_add(). If 56 OVERRIDE is true, then values in ENVZ2 will supersede those with the same 57 name in ENV, otherwise not. */ 58 extern error_t envz_merge (char **__restrict __envz, 59 size_t *__restrict __envz_len, 60 __const char *__restrict __envz2, 61 size_t __envz2_len, int __override) __THROW; 62 63 /* Remove the entry for NAME from ENVZ & ENVZ_LEN, if any. */ 64 extern void envz_remove (char **__restrict __envz, 65 size_t *__restrict __envz_len, 66 __const char *__restrict __name) __THROW; 67 68 /* Remove null entries. */ 69 extern void envz_strip (char **__restrict __envz, 70 size_t *__restrict __envz_len) __THROW; 71 72 __END_DECLS 73 74 #endif /* envz.h */ 75
