1 /* Copyright (C) 1991 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library 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 GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
19 /* Hacked slightly by jjc@jclark.com for groff. */
26 typedef size_t SIZE_T;
27 #else /* not __STDC__ */
30 #endif /* not __STDC__ */
34 #else /* not HAVE_STDLIB_H */
36 #endif /* not HAVE_STDLIB_H */
42 extern char **environ;
44 /* Put STRING, which is of the form "NAME=VALUE", in the environment. */
46 int putenv(const char *string)
48 char *name_end = strchr(string, '=');
54 /* Remove the variable from the environment. */
55 size = strlen(string);
56 for (ep = environ; *ep != NULL; ++ep)
57 if (!strncmp(*ep, string, size) && (*ep)[size] == '=')
70 for (ep = environ; *ep != NULL; ++ep)
71 if (!strncmp(*ep, string, name_end - string)
72 && (*ep)[name_end - string] == '=')
79 static char **last_environ = NULL;
80 char **new_environ = (char **) malloc((size + 2) * sizeof(char *));
81 if (new_environ == NULL)
83 (void) memcpy((PTR) new_environ, (PTR) environ, size * sizeof(char *));
84 new_environ[size] = (char *) string;
85 new_environ[size + 1] = NULL;
86 if (last_environ != NULL)
87 free((PTR) last_environ);
88 last_environ = new_environ;
89 environ = new_environ;
92 *ep = (char *) string;