1 files changed, 69 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/roken/unsetenv.c b/third_party/heimdal/lib/roken/unsetenv.c
new file mode 100644
index 0000000..55ba5e3
--- /dev/null
+++ b/third_party/heimdal/lib/roken/unsetenv.c
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "roken.h"
+
+#if !HAVE_DECL_ENVIRON
+extern char **environ;
+#endif
+
+/*
+ * unsetenv --
+ */
+ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
+unsetenv(const char *name)
+{
+  int len;
+  const char *np;
+  char **p;
+
+  if (name == 0 || environ == 0)
+    return;
+
+  for (np = name; *np && *np != '='; np++)
+    /* nop */;
+  len = np - name;
+
+  for (p = environ; *p != 0; p++)
+    if (strncmp(*p, name, len) == 0 && (*p)[len] == '=')
+      break;
+
+  for (; *p != 0; p++)
+    *p = *(p + 1);
+}
+