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-rw-r--r--tests/putenv.c132
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diff --git a/tests/putenv.c b/tests/putenv.c
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+/* Copyright (C) 1991, 1994, 1997-1998, 2000, 2003-2010 Free Software
+ Foundation, Inc.
+
+ NOTE: The canonical source of this file is maintained with the GNU C
+ Library. Bugs can be reported to bug-glibc@prep.ai.mit.edu.
+
+ 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 3 of the License, or 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, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+/* Specification. */
+#include <stdlib.h>
+
+#include <stddef.h>
+
+/* Include errno.h *after* sys/types.h to work around header problems
+ on AIX 3.2.5. */
+#include <errno.h>
+#ifndef __set_errno
+# define __set_errno(ev) ((errno) = (ev))
+#endif
+
+#include <string.h>
+#include <unistd.h>
+
+#if HAVE_GNU_LD
+# define environ __environ
+#else
+extern char **environ;
+#endif
+
+#if _LIBC
+/* This lock protects against simultaneous modifications of `environ'. */
+# include <bits/libc-lock.h>
+__libc_lock_define_initialized (static, envlock)
+# define LOCK __libc_lock_lock (envlock)
+# define UNLOCK __libc_lock_unlock (envlock)
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+static int
+_unsetenv (const char *name)
+{
+ size_t len;
+ char **ep;
+
+ if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+
+ len = strlen (name);
+
+ LOCK;
+
+ ep = environ;
+ while (*ep != NULL)
+ if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
+ {
+ /* Found it. Remove this pointer by moving later ones back. */
+ char **dp = ep;
+
+ do
+ dp[0] = dp[1];
+ while (*dp++);
+ /* Continue the loop in case NAME appears again. */
+ }
+ else
+ ++ep;
+
+ UNLOCK;
+
+ return 0;
+}
+
+
+/* Put STRING, which is of the form "NAME=VALUE", in the environment.
+ If STRING contains no `=', then remove STRING from the environment. */
+int
+putenv (char *string)
+{
+ const char *const name_end = strchr (string, '=');
+ register size_t size;
+ register char **ep;
+
+ if (name_end == NULL)
+ {
+ /* Remove the variable from the environment. */
+ return _unsetenv (string);
+ }
+
+ size = 0;
+ for (ep = environ; *ep != NULL; ++ep)
+ if (!strncmp (*ep, string, name_end - string) &&
+ (*ep)[name_end - string] == '=')
+ break;
+ else
+ ++size;
+
+ if (*ep == NULL)
+ {
+ static char **last_environ = NULL;
+ char **new_environ = (char **) malloc ((size + 2) * sizeof (char *));
+ if (new_environ == NULL)
+ return -1;
+ (void) memcpy ((void *) new_environ, (void *) environ,
+ size * sizeof (char *));
+ new_environ[size] = (char *) string;
+ new_environ[size + 1] = NULL;
+ free (last_environ);
+ last_environ = new_environ;
+ environ = new_environ;
+ }
+ else
+ *ep = string;
+
+ return 0;
+}