1 files changed, 51 insertions, 0 deletions
diff --git a/replace/unsetenv.c b/replace/unsetenv.c
new file mode 100644
index 0000000..aeb84a3
--- /dev/null
+++ b/replace/unsetenv.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2001 Alan Robertson <alanr@unix.sh>
+ * This software licensed under the GNU LGPL.
+ *
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <lha_internal.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define __environ       environ
+#ifndef HAVE_ENVIRON_DECL
+extern char **environ;
+#endif
+
+int
+unsetenv (const char *name)
+{
+	const size_t len = strlen (name);
+	char **ep;
+
+	for (ep = __environ; *ep; ++ep) {
+		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.  */  
+		}
+	}
+	return 0;
+}