Remove 'grp' and merge into 'nss' and 'posix'

The majority of grp routines are entry points for nss functionality.
This commit removes the 'grp' subdirectory and moves all nss-relevant
functionality and all tests to 'nss', and the 'setgroups' stub into
'posix' (alongside the 'getgroups' stub).  References to grp/ are
accordingly changed.  In addition, compat-initgroups.c, a fallback
implementation of initgroups is renamed to initgroups-fallback.c so that
the build system does not confuse it for nss_compat/compat-initgroups.c.

Build time improves very slightly; e.g. down from an average of 45.5s to
44.5s on an 8-thread mobile x86_64 CPU.
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 0 insertions, 87 deletions

diff --git a/grp/fgetgrent.c b/grp/fgetgrent.c
deleted file mode 100644
index 2e7c7fe..0000000
--- a/grp/fgetgrent.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* Copyright (C) 1991-2023 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
-   <https://www.gnu.org/licenses/>.  */
-
-#include <errno.h>
-#include <grp.h>
-#include <libc-lock.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <set-freeres.h>
-
-
-/* We need to protect the dynamic buffer handling.  */
-__libc_lock_define_initialized (static, lock);
-
-static char *buffer;
-
-/* Read one entry from the given stream.  */
-struct group *
-fgetgrent (FILE *stream)
-{
-  static size_t buffer_size;
-  static struct group resbuf;
-  fpos_t pos;
-  struct group *result;
-  int save;
-
-  if (__builtin_expect (fgetpos (stream, &pos), 0) != 0)
-    return NULL;
-
-  /* Get lock.  */
-  __libc_lock_lock (lock);
-
-  /* Allocate buffer if not yet available.  */
-  if (buffer == NULL)
-    {
-      buffer_size = NSS_BUFLEN_GROUP;
-      buffer = malloc (buffer_size);
-    }
-
-  while (buffer != NULL
-	 && (__fgetgrent_r (stream, &resbuf, buffer, buffer_size, &result)
-	     == ERANGE))
-    {
-      char *new_buf;
-      buffer_size += NSS_BUFLEN_GROUP;
-      new_buf = realloc (buffer, buffer_size);
-      if (__glibc_unlikely (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;
-}
-
-weak_alias (buffer, __libc_fgetgrent_freemem_ptr)