1 files changed, 77 insertions, 0 deletions
diff --git a/posix/getopt_init.c b/posix/getopt_init.c
new file mode 100644
index 0000000000..e90c9d7d8a
--- /dev/null
+++ b/posix/getopt_init.c
@@ -0,0 +1,77 @@
+/* Perform additional initialization for getopt functions in GNU libc.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* Attention: this file is *not* necessary when the GNU getopt functions
+   are used outside the GNU libc.  Some additional functionality of the
+   getopt functions in GNU libc require this additional work.  */
+
+#include <getopt.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "../stdio-common/_itoa.h"
+
+/* External variable to synchronize work.  */
+extern char *__getopt_nonoption_flags;
+
+extern pid_t __libc_pid;
+
+
+/* Remove the environment variable "_<PID>_GNU_nonoption_argv_flags_" if
+   it is still available.  If the getopt functions are also used in the
+   application it does not exist anymore since it was saved for the use
+   in getopt.  */
+void
+__getopt_clean_environment (void)
+{
+  /* Bash 2.0 puts a special variable in the environment for each
+     command it runs, specifying which ARGV elements are the results
+     of file name wildcard expansion and therefore should not be
+     considered as options.  */
+  static const char envvar_tail[] = "_GNU_nonoption_argv_flags_";
+  char var[100];
+  char *cp, **ep;
+  size_t len;
+
+  /* Generate name of the environment variable.  We must know the PID
+     and we must not use `sprintf'.  */
+  if (__libc_pid == 0)
+    __libc_pid = getpid ();
+
+  /* Construct "_<PID>_GNU_nonoption_argv_flags_" string.  */
+  cp = memcpy (&var[sizeof (var) - sizeof (envvar_tail)], envvar_tail,
+	       sizeof (envvar_tail));
+  cp = _itoa_word (__libc_pid, cp, 10, 0);
+  *--cp = '_';
+  len = (var + sizeof (var) - 1) - cp;
+
+  for (ep = __environ; *ep != NULL; ++ep)
+    if (!strncmp (*ep, cp, len) && (*ep)[len] == '=')
+      {
+	/* Found it.  Store this pointer and move later ones back.  */
+	char **dp = ep;
+	__getopt_nonoption_flags = &(*ep)[len + 1];
+	do
+	  dp[0] = dp[1];
+	while (*dp++);
+	/* Continue the loop in case the name appears again.  */
+      }
+}