diff --git a/ap/libc/glibc/glibc-2.23/gshadow/Makefile b/ap/libc/glibc/glibc-2.23/gshadow/Makefile
new file mode 100644
index 0000000..5d0e5e7
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/Makefile
@@ -0,0 +1,39 @@
+# Copyright (C) 2009-2016 Free Software Foundation, Inc.
+# This file is part of the GNU C Library.
+
+# The GNU C 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.
+
+# 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
+# Lesser General Public License for more details.
+
+# You should have received a copy of the GNU Lesser General Public
+# License along with the GNU C Library; if not, see
+# <http://www.gnu.org/licenses/>.
+
+#
+#	Makefile for gshadow.
+#
+subdir	:= gshadow
+
+include ../Makeconfig
+
+headers		= gshadow.h
+routines	= getsgent getsgnam sgetsgent fgetsgent putsgent \
+		  getsgent_r getsgnam_r sgetsgent_r fgetsgent_r
+
+tests = tst-gshadow tst-putsgent
+
+CFLAGS-getsgent_r.c = -fexceptions
+CFLAGS-getsgent.c = -fexceptions
+CFLAGS-fgetsgent.c = -fexceptions
+CFLAGS-fgetsgent_r.c = -fexceptions $(libio-mtsafe)
+CFLAGS-putsgent.c = -fexceptions $(libio-mtsafe)
+CFLAGS-getsgnam.c = -fexceptions
+CFLAGS-getsgnam_r.c = -fexceptions
+
+include ../Rules
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/Versions b/ap/libc/glibc/glibc-2.23/gshadow/Versions
new file mode 100644
index 0000000..1dba0c5
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/Versions
@@ -0,0 +1,21 @@
+libc {
+  GLIBC_2.10 {
+    # e*
+    endsgent;
+
+    # f*
+    fgetsgent; fgetsgent_r;
+
+    # g*
+    getsgent; getsgent_r; getsgnam; getsgnam_r;
+
+    # p*
+    putsgent;
+
+    # s*
+    setsgent;
+
+    # s*
+    sgetsgent; sgetsgent_r;
+  }
+}
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/fgetsgent.c b/ap/libc/glibc/glibc-2.23/gshadow/fgetsgent.c
new file mode 100644
index 0000000..670cb8e
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/fgetsgent.c
@@ -0,0 +1,87 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <libc-lock.h>
+#include <gshadow.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+
+/* A reasonable size for a buffer to start with.  */
+#define BUFLEN_SPWD 1024
+
+/* We need to protect the dynamic buffer handling.  */
+__libc_lock_define_initialized (static, lock);
+
+libc_freeres_ptr (static char *buffer);
+
+/* Read one shadow entry from the given stream.  */
+struct sgrp *
+fgetsgent (FILE *stream)
+{
+  static size_t buffer_size;
+  static struct sgrp resbuf;
+  fpos_t pos;
+  struct sgrp *result;
+  int save;
+
+  if (fgetpos (stream, &pos) != 0)
+    return NULL;
+
+  /* Get lock.  */
+  __libc_lock_lock (lock);
+
+  /* Allocate buffer if not yet available.  */
+  if (buffer == NULL)
+    {
+      buffer_size = BUFLEN_SPWD;
+      buffer = malloc (buffer_size);
+    }
+
+  while (buffer != NULL
+	 && (__fgetsgent_r (stream, &resbuf, buffer, buffer_size, &result)
+	     == ERANGE))
+    {
+      char *new_buf;
+      buffer_size += BUFLEN_SPWD;
+      new_buf = realloc (buffer, buffer_size);
+      if (new_buf == NULL)
+	{
+	  /* We are out of memory.  Free the current buffer so that the
+	     process gets a chance for a normal termination.  */
+	  save = errno;
+	  free (buffer);
+	  __set_errno (save);
+	}
+      buffer = new_buf;
+
+      /* Reset the stream.  */
+      if (fsetpos (stream, &pos) != 0)
+	buffer = NULL;
+    }
+
+  if (buffer == NULL)
+    result = NULL;
+
+  /* Release lock.  Preserve error value.  */
+  save = errno;
+  __libc_lock_unlock (lock);
+  __set_errno (save);
+
+  return result;
+}
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/fgetsgent_r.c b/ap/libc/glibc/glibc-2.23/gshadow/fgetsgent_r.c
new file mode 100644
index 0000000..b70f6fa
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/fgetsgent_r.c
@@ -0,0 +1,75 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <ctype.h>
+#include <errno.h>
+#include <gshadow.h>
+#include <stdio.h>
+
+/* Define a line parsing function using the common code
+   used in the nss_files module.  */
+
+#define STRUCTURE	sgrp
+#define ENTNAME		sgent
+#define	EXTERN_PARSER	1
+struct sgent_data {};
+
+#include <nss/nss_files/files-parse.c>
+
+
+/* Read one shadow entry from the given stream.  */
+int
+__fgetsgent_r (FILE *stream, struct sgrp *resbuf, char *buffer, size_t buflen,
+	       struct sgrp **result)
+{
+  char *p;
+
+  _IO_flockfile (stream);
+  do
+    {
+      buffer[buflen - 1] = '\xff';
+      p = fgets_unlocked (buffer, buflen, stream);
+      if (p == NULL && feof_unlocked (stream))
+	{
+	  _IO_funlockfile (stream);
+	  *result = NULL;
+	  __set_errno (ENOENT);
+	  return errno;
+	}
+      if (p == NULL || buffer[buflen - 1] != '\xff')
+	{
+	  _IO_funlockfile (stream);
+	  *result = NULL;
+	  __set_errno (ERANGE);
+	  return errno;
+	}
+
+      /* Skip leading blanks.  */
+      while (isspace (*p))
+	++p;
+    } while (*p == '\0' || *p == '#' ||	/* Ignore empty and comment lines.  */
+	     /* Parse the line.  If it is invalid, loop to
+		get the next line of the file to parse.  */
+	     ! parse_line (buffer, (void *) resbuf, (void *) buffer, buflen,
+			   &errno));
+
+  _IO_funlockfile (stream);
+
+  *result = resbuf;
+  return 0;
+}
+weak_alias (__fgetsgent_r, fgetsgent_r)
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/getsgent.c b/ap/libc/glibc/glibc-2.23/gshadow/getsgent.c
new file mode 100644
index 0000000..3f23d95
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/getsgent.c
@@ -0,0 +1,32 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <gshadow.h>
+
+
+#define LOOKUP_TYPE	struct sgrp
+#define SETFUNC_NAME	setsgent
+#define	GETFUNC_NAME	getsgent
+#define	ENDFUNC_NAME	endsgent
+#define DATABASE_NAME	gshadow
+#define BUFLEN		1024
+
+/* There is no nscd support for the shadow file.  */
+#undef	USE_NSCD
+
+#include "../nss/getXXent.c"
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/getsgent_r.c b/ap/libc/glibc/glibc-2.23/gshadow/getsgent_r.c
new file mode 100644
index 0000000..75eac7d
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/getsgent_r.c
@@ -0,0 +1,33 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <gshadow.h>
+
+
+#define LOOKUP_TYPE		struct sgrp
+#define SETFUNC_NAME		setsgent
+#define	GETFUNC_NAME		getsgent
+#define	ENDFUNC_NAME		endsgent
+#define DATABASE_NAME		gshadow
+#define BUFLEN			1024
+#define NO_COMPAT_NEEDED	1
+
+/* There is no nscd support for the shadow file.  */
+#undef	USE_NSCD
+
+#include "../nss/getXXent_r.c"
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/getsgnam.c b/ap/libc/glibc/glibc-2.23/gshadow/getsgnam.c
new file mode 100644
index 0000000..cc1b989
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/getsgnam.c
@@ -0,0 +1,32 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <gshadow.h>
+
+
+#define LOOKUP_TYPE	struct sgrp
+#define FUNCTION_NAME	getsgnam
+#define DATABASE_NAME	gshadow
+#define ADD_PARAMS	const char *name
+#define ADD_VARIABLES	name
+#define BUFLEN		1024
+
+/* There is no nscd support for the shadow file.  */
+#undef	USE_NSCD
+
+#include "../nss/getXXbyYY.c"
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/getsgnam_r.c b/ap/libc/glibc/glibc-2.23/gshadow/getsgnam_r.c
new file mode 100644
index 0000000..102621c
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/getsgnam_r.c
@@ -0,0 +1,33 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <gshadow.h>
+
+
+#define LOOKUP_TYPE		struct sgrp
+#define FUNCTION_NAME		getsgnam
+#define DATABASE_NAME		gshadow
+#define ADD_PARAMS		const char *name
+#define ADD_VARIABLES		name
+#define BUFLEN			1024
+#define NO_COMPAT_NEEDED	1
+
+/* There is no nscd support for the shadow file.  */
+#undef	USE_NSCD
+
+#include "../nss/getXXbyYY_r.c"
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/gshadow.h b/ap/libc/glibc/glibc-2.23/gshadow/gshadow.h
new file mode 100644
index 0000000..2afd8bd
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/gshadow.h
@@ -0,0 +1,130 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Declaration of types and functions for shadow group suite.  */
+
+#ifndef _GSHADOW_H
+#define _GSHADOW_H	1
+
+#include <features.h>
+
+#include <paths.h>
+
+#define	__need_FILE
+#include <stdio.h>
+#define __need_size_t
+#include <stddef.h>
+
+/* Path to the user database files.  */
+#define	GSHADOW _PATH_GSHADOW
+
+
+__BEGIN_DECLS
+
+/* Structure of the group file.  */
+struct sgrp
+  {
+    char *sg_namp;		/* Group name.  */
+    char *sg_passwd;		/* Encrypted password.  */
+    char **sg_adm;		/* Group administrator list.  */
+    char **sg_mem;		/* Group member list.  */
+  };
+
+
+/* Open database for reading.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern void setsgent (void);
+
+/* Close database.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern void endsgent (void);
+
+/* Get next entry from database, perhaps after opening the file.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern struct sgrp *getsgent (void);
+
+/* Get shadow entry matching NAME.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern struct sgrp *getsgnam (const char *__name);
+
+/* Read shadow entry from STRING.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern struct sgrp *sgetsgent (const char *__string);
+
+/* Read next shadow entry from STREAM.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern struct sgrp *fgetsgent (FILE *__stream);
+
+/* Write line containing shadow password entry to stream.
+
+   This function is not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation it is a cancellation point and
+   therefore not marked with __THROW.  */
+extern int putsgent (const struct sgrp *__g, FILE *__stream);
+
+
+#ifdef __USE_MISC
+/* Reentrant versions of some of the functions above.
+
+   These functions are not part of POSIX and therefore no official
+   cancellation point.  But due to similarity with an POSIX interface
+   or due to the implementation they are cancellation points and
+   therefore not marked with __THROW.  */
+extern int getsgent_r (struct sgrp *__result_buf, char *__buffer,
+		       size_t __buflen, struct sgrp **__result);
+
+extern int getsgnam_r (const char *__name, struct sgrp *__result_buf,
+		       char *__buffer, size_t __buflen,
+		       struct sgrp **__result);
+
+extern int sgetsgent_r (const char *__string, struct sgrp *__result_buf,
+			char *__buffer, size_t __buflen,
+			struct sgrp **__result);
+
+extern int fgetsgent_r (FILE *__stream, struct sgrp *__result_buf,
+			char *__buffer, size_t __buflen,
+			struct sgrp **__result);
+#endif	/* misc */
+
+__END_DECLS
+
+#endif /* gshadow.h */
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/putsgent.c b/ap/libc/glibc/glibc-2.23/gshadow/putsgent.c
new file mode 100644
index 0000000..03f9d10
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/putsgent.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <gshadow.h>
+#include <nss.h>
+
+#define _S(x)	x ? x : ""
+
+
+/* Write an entry to the given stream.
+   This must know the format of the group file.  */
+int
+putsgent (const struct sgrp *g, FILE *stream)
+{
+  int errors = 0;
+
+  if (g->sg_namp == NULL || !__nss_valid_field (g->sg_namp)
+      || !__nss_valid_field (g->sg_passwd)
+      || !__nss_valid_list_field (g->sg_adm)
+      || !__nss_valid_list_field (g->sg_mem))
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  _IO_flockfile (stream);
+
+  if (fprintf (stream, "%s:%s:", g->sg_namp, _S (g->sg_passwd)) < 0)
+    ++errors;
+
+  bool first = true;
+  char **sp = g->sg_adm;
+  if (sp != NULL)
+    while (*sp != NULL)
+      {
+	if (fprintf (stream, "%s%s", first ? "" : ",", *sp++) < 0)
+	  {
+	    ++errors;
+	    break;
+	  }
+	first = false;
+      }
+  if (putc_unlocked (':', stream) == EOF)
+    ++errors;
+
+  first = true;
+  sp = g->sg_mem;
+  if (sp != NULL)
+    while (*sp != NULL)
+      {
+	if (fprintf (stream, "%s%s", first ? "" : ",", *sp++) < 0)
+	  {
+	    ++errors;
+	    break;
+	  }
+	first = false;
+      }
+  if (putc_unlocked ('\n', stream) == EOF)
+    ++errors;
+
+  _IO_funlockfile (stream);
+
+  return errors ? -1 : 0;
+}
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/sgetsgent.c b/ap/libc/glibc/glibc-2.23/gshadow/sgetsgent.c
new file mode 100644
index 0000000..1e95ac4
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/sgetsgent.c
@@ -0,0 +1,77 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <libc-lock.h>
+#include <gshadow.h>
+#include <stdlib.h>
+
+
+/* A reasonable size for a buffer to start with.  */
+#define BUFLEN_SPWD 1024
+
+/* We need to protect the dynamic buffer handling.  */
+__libc_lock_define_initialized (static, lock);
+
+/* Read one shadow entry from the given stream.  */
+struct sgrp *
+sgetsgent (const char *string)
+{
+  static char *buffer;
+  static size_t buffer_size;
+  static struct sgrp resbuf;
+  struct sgrp *result;
+  int save;
+
+  /* Get lock.  */
+  __libc_lock_lock (lock);
+
+  /* Allocate buffer if not yet available.  */
+  if (buffer == NULL)
+    {
+      buffer_size = BUFLEN_SPWD;
+      buffer = malloc (buffer_size);
+    }
+
+  while (buffer != NULL
+	 && __sgetsgent_r (string, &resbuf, buffer, buffer_size, &result) != 0
+	 && errno == ERANGE)
+    {
+      char *new_buf;
+      buffer_size += BUFLEN_SPWD;
+      new_buf = realloc (buffer, buffer_size);
+      if (new_buf == NULL)
+	{
+	  /* We are out of memory.  Free the current buffer so that the
+	     process gets a chance for a normal termination.  */
+	  save = errno;
+	  free (buffer);
+	  __set_errno (save);
+	}
+      buffer = new_buf;
+    }
+
+  if (buffer == NULL)
+    result = NULL;
+
+  /* Release lock.  Preserve error value.  */
+  save = errno;
+  __libc_lock_unlock (lock);
+  __set_errno (save);
+
+  return result;
+}
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/sgetsgent_r.c b/ap/libc/glibc/glibc-2.23/gshadow/sgetsgent_r.c
new file mode 100644
index 0000000..11f7a2a
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/sgetsgent_r.c
@@ -0,0 +1,74 @@
+/* Copyright (C) 2009-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <ctype.h>
+#include <errno.h>
+#include <gshadow.h>
+#include <stdio.h>
+#include <string.h>
+
+/* Define a line parsing function using the common code
+   used in the nss_files module.  */
+
+#define STRUCTURE	sgrp
+#define ENTNAME		sgent
+struct sgent_data {};
+
+
+#define TRAILING_LIST_MEMBER		sg_mem
+#define TRAILING_LIST_SEPARATOR_P(c)	((c) == ',')
+#include <nss/nss_files/files-parse.c>
+LINE_PARSER
+(,
+ STRING_FIELD (result->sg_namp, ISCOLON, 0);
+ if (line[0] == '\0'
+     && (result->sg_namp[0] == '+' || result->sg_namp[0] == '-'))
+   {
+     result->sg_passwd = NULL;
+     result->sg_adm = NULL;
+     result->sg_mem = NULL;
+   }
+ else
+   {
+     STRING_FIELD (result->sg_passwd, ISCOLON, 0);
+     STRING_LIST (result->sg_adm, ':');
+   }
+ )
+
+
+/* Read one shadow entry from the given stream.  */
+int
+__sgetsgent_r (const char *string, struct sgrp *resbuf, char *buffer,
+	       size_t buflen, struct sgrp **result)
+{
+  char *sp;
+  if (string < buffer || string >= buffer + buflen)
+    {
+      buffer[buflen - 1] = '\0';
+      sp = strncpy (buffer, string, buflen);
+      if (buffer[buflen - 1] != '\0')
+	return ERANGE;
+    }
+  else
+    sp = (char *) string;
+
+  int parse_result = parse_line (sp, resbuf, (void *) buffer, buflen, &errno);
+  *result = parse_result > 0 ? resbuf : NULL;
+
+  return *result == NULL ? errno : 0;
+}
+weak_alias (__sgetsgent_r, sgetsgent_r)
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/tst-gshadow.c b/ap/libc/glibc/glibc-2.23/gshadow/tst-gshadow.c
new file mode 100644
index 0000000..8b469b7
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/tst-gshadow.c
@@ -0,0 +1,141 @@
+#include <gshadow.h>
+#include <stdio.h>
+#include <string.h>
+
+
+static const struct sgrp data[] =
+  {
+    { (char *) "one", (char *) "pwdone",
+      (char *[]) { (char *) "admoneone", (char *) "admonetwo",
+		  (char *) "admonethree", NULL },
+      (char *[]) { (char *) "memoneone", (char *) "memonetwo",
+		  (char *) "memonethree", NULL } },
+    { (char *) "two", (char *) "pwdtwo",
+      (char *[]) { (char *) "admtwoone", (char *) "admtwotwo", NULL },
+      (char *[]) { (char *) "memtwoone", (char *) "memtwotwo",
+		  (char *) "memtwothree", NULL } },
+    { (char *) "three", (char *) "pwdthree",
+      (char *[]) { (char *) "admthreeone", (char *) "admthreetwo", NULL },
+      (char *[]) { (char *) "memthreeone", (char *) "memthreetwo", NULL } },
+    { (char *) "four", (char *) "pwdfour",
+      (char *[]) { (char *) "admfourone", (char *) "admfourtwo", NULL },
+      (char *[]) { NULL } },
+    { (char *) "five", (char *) "pwdfive",
+      (char *[]) { NULL },
+      (char *[]) { (char *) "memfiveone", (char *) "memfivetwo", NULL } },
+  };
+#define ndata (sizeof (data) / sizeof (data[0]))
+
+
+static int
+do_test (void)
+{
+  FILE *fp = tmpfile ();
+  if (fp == NULL)
+    {
+      puts ("cannot open temporary file");
+      return 1;
+    }
+
+  for (size_t i = 0; i < ndata; ++i)
+    if (putsgent (&data[i], fp) != 0)
+      {
+	printf ("putsgent call %zu failed\n", i + 1);
+	return 1;
+      }
+
+  rewind (fp);
+
+  int result = 0;
+  int seen = -1;
+  struct sgrp *g;
+  while ((g = fgetsgent (fp)) != NULL)
+    {
+      ++seen;
+      if (strcmp (g->sg_namp, data[seen].sg_namp) != 0)
+	{
+	  printf ("sg_namp of entry %d does not match: %s vs %s\n",
+		  seen + 1, g->sg_namp, data[seen].sg_namp);
+	  result = 1;
+	}
+      if (strcmp (g->sg_passwd, data[seen].sg_passwd) != 0)
+	{
+	  printf ("sg_passwd of entry %d does not match: %s vs %s\n",
+		  seen + 1, g->sg_passwd, data[seen].sg_passwd);
+	  result = 1;
+	}
+      if (g->sg_adm == NULL)
+	{
+	  printf ("sg_adm of entry %d is NULL\n", seen + 1);
+	  result = 1;
+	}
+      else
+	{
+	  int i = 1;
+	  char **sp1 = g->sg_adm;
+	  char **sp2 = data[seen].sg_adm;
+	  while (*sp1 != NULL && *sp2 != NULL)
+	    {
+	      if (strcmp (*sp1, *sp2) != 0)
+		{
+		  printf ("sg_adm[%d] of entry %d does not match: %s vs %s\n",
+			  i, seen + 1, *sp1, *sp2);
+		  result = 1;
+		}
+	      ++sp1;
+	      ++sp2;
+	      ++i;
+	    }
+	  if (*sp1 == NULL && *sp2 != NULL)
+	    {
+	      printf ("sg_adm of entry %d has too few entries\n", seen + 1);
+	      result = 1;
+	    }
+	  else if (*sp1 != NULL && *sp2 == NULL)
+	    {
+	      printf ("sg_adm of entry %d has too many entries\n", seen + 1);
+	      result = 1;
+	    }
+	}
+      if (g->sg_mem == NULL)
+	{
+	  printf ("sg_mem of entry %d is NULL\n", seen + 1);
+	  result = 1;
+	}
+      else
+	{
+	  int i = 1;
+	  char **sp1 = g->sg_mem;
+	  char **sp2 = data[seen].sg_mem;
+	  while (*sp1 != NULL && *sp2 != NULL)
+	    {
+	      if (strcmp (*sp1, *sp2) != 0)
+		{
+		  printf ("sg_mem[%d] of entry %d does not match: %s vs %s\n",
+			  i, seen + 1, *sp1, *sp2);
+		  result = 1;
+		}
+	      ++sp1;
+	      ++sp2;
+	      ++i;
+	    }
+	  if (*sp1 == NULL && *sp2 != NULL)
+	    {
+	      printf ("sg_mem of entry %d has too few entries\n", seen + 1);
+	      result = 1;
+	    }
+	  else if (*sp1 != NULL && *sp2 == NULL)
+	    {
+	      printf ("sg_mem of entry %d has too many entries\n", seen + 1);
+	      result = 1;
+	    }
+	}
+    }
+
+  fclose (fp);
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
diff --git a/ap/libc/glibc/glibc-2.23/gshadow/tst-putsgent.c b/ap/libc/glibc/glibc-2.23/gshadow/tst-putsgent.c
new file mode 100644
index 0000000..53ecb18
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/gshadow/tst-putsgent.c
@@ -0,0 +1,168 @@
+/* Test for processing of invalid gshadow entries.  [BZ #18724]
+   Copyright (C) 2015-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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.
+
+   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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <gshadow.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static bool errors;
+
+static void
+check (struct sgrp e, const char *expected)
+{
+  char *buf;
+  size_t buf_size;
+  FILE *f = open_memstream (&buf, &buf_size);
+
+  if (f == NULL)
+    {
+      printf ("open_memstream: %m\n");
+      errors = true;
+      return;
+    }
+
+  int ret = putsgent (&e, f);
+
+  if (expected == NULL)
+    {
+      if (ret == -1)
+	{
+	  if (errno != EINVAL)
+	    {
+	      printf ("putsgent: unexpected error code: %m\n");
+	      errors = true;
+	    }
+	}
+      else
+	{
+	  printf ("putsgent: unexpected success (\"%s\")\n", e.sg_namp);
+	  errors = true;
+	}
+    }
+  else
+    {
+      /* Expect success.  */
+      size_t expected_length = strlen (expected);
+      if (ret == 0)
+	{
+	  long written = ftell (f);
+
+	  if (written <= 0 || fflush (f) < 0)
+	    {
+	      printf ("stream error: %m\n");
+	      errors = true;
+	    }
+	  else if (buf[written - 1] != '\n')
+	    {
+	      printf ("FAILED: \"%s\" without newline\n", expected);
+	      errors = true;
+	    }
+	  else if (strncmp (buf, expected, written - 1) != 0
+		   || written - 1 != expected_length)
+	    {
+	      printf ("FAILED: \"%s\" (%ld), expected \"%s\" (%zu)\n",
+		      buf, written - 1, expected, expected_length);
+	      errors = true;
+	    }
+	}
+      else
+	{
+	  printf ("FAILED: putsgent (expected \"%s\"): %m\n", expected);
+	  errors = true;
+	}
+    }
+
+  fclose (f);
+  free (buf);
+}
+
+static int
+do_test (void)
+{
+  check ((struct sgrp) {
+      .sg_namp = (char *) "root",
+    },
+    "root:::");
+  check ((struct sgrp) {
+      .sg_namp = (char *) "root",
+      .sg_passwd = (char *) "password",
+    },
+    "root:password::");
+  check ((struct sgrp) {
+      .sg_namp = (char *) "root",
+      .sg_passwd = (char *) "password",
+      .sg_adm = (char *[]) {(char *) "adm1", (char *) "adm2", NULL},
+      .sg_mem = (char *[]) {(char *) "mem1", (char *) "mem2", NULL},
+    },
+    "root:password:adm1,adm2:mem1,mem2");
+
+  /* Bad values.  */
+  {
+    static const char *const bad_strings[] = {
+      ":",
+      "\n",
+      ":bad",
+      "\nbad",
+      "b:ad",
+      "b\nad",
+      "bad:",
+      "bad\n",
+      "b:a\nd",
+      ",",
+      "\n,",
+      ":,",
+      ",bad",
+      "b,ad",
+      "bad,",
+      NULL
+    };
+    for (const char *const *bad = bad_strings; *bad != NULL; ++bad)
+      {
+	char *members[]
+	  = {(char *) "first", (char *) *bad, (char *) "last", NULL};
+	if (strpbrk (*bad, ":\n") != NULL)
+	  {
+	    check ((struct sgrp) {
+		.sg_namp = (char *) *bad,
+	      }, NULL);
+	    check ((struct sgrp) {
+		.sg_namp = (char *) "root",
+		.sg_passwd = (char *) *bad,
+	      }, NULL);
+	  }
+	check ((struct sgrp) {
+	    .sg_namp = (char *) "root",
+	    .sg_passwd = (char *) "password",
+	    .sg_adm = members
+	  }, NULL);
+	check ((struct sgrp) {
+	    .sg_namp = (char *) "root",
+	    .sg_passwd = (char *) "password",
+	    .sg_mem = members
+	  }, NULL);
+      }
+  }
+
+  return errors;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"