1 /* Copyright (C) 1991, 1994, 1997, 1998 Free Software Foundation, Inc.
3 NOTE: The canonical source of this file is maintained with the GNU C
4 Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
6 This program is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 /* Disable the definition of putenv to rpl_putenv (from config.h) in this
27 file. Otherwise, we'd get conflicting prototypes for rpl_putenv on
28 systems like Irix 5.3. */
31 #include <sys/types.h>
33 #if defined (__GNU_LIBRARY__) || defined (HAVE_STDLIB_H)
34 /* Some stdlib.h (e.g., Solaris 2.7) declare putenv with a non-const argument.
35 Since that would conflict with the declaration below, we rename putenv in
36 that incompatible prototype. */
37 # define putenv vendor_putenv_prototype
42 #if defined (__GNU_LIBRARY__) || defined (HAVE_STRING_H)
45 #if defined (__GNU_LIBRARY__) || defined (HAVE_UNISTD_H)
49 #if !defined (__GNU_LIBRARY__) && !defined (HAVE_STRCHR)
52 #if !defined (__GNU_LIBRARY__) && !defined (HAVE_MEMCPY)
53 # define memcpy(d,s,n) bcopy ((s), (d), (n))
57 # define environ __environ
59 extern char **environ;
67 /* Put STRING, which is of the form "NAME=VALUE", in the environment. */
69 rpl_putenv (const char *string)
71 const char *const name_end = strchr (string, '=');
77 /* Remove the variable from the environment. */
78 size = strlen (string);
79 for (ep = environ; *ep != NULL; ++ep)
80 if (!strncmp (*ep, string, size) && (*ep)[size] == '=')
93 for (ep = environ; *ep != NULL; ++ep)
94 if (!strncmp (*ep, string, name_end - string) &&
95 (*ep)[name_end - string] == '=')
102 static char **last_environ = NULL;
103 char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
104 if (new_environ == NULL)
106 (void) memcpy ((void *) new_environ, (void *) environ,
107 size * sizeof (char *));
108 new_environ[size] = (char *) string;
109 new_environ[size + 1] = NULL;
110 if (last_environ != NULL)
111 free ((void *) last_environ);
112 last_environ = new_environ;
113 environ = new_environ;
116 *ep = (char *) string;