Generic getXXent function.

nss/getnssent.c

@@ -0,0 +1,64 @@
+/* Copyright (C) 2000 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 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.  */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <netdb.h>
+#include "nsswitch.h"
+
+void *
+__nss_getent (getent_r_function func, void **resbuf, char **buffer,
+	      size_t buflen, size_t *buffer_size, int *h_errnop)
+{
+  void *result;
+  int save;
+
+  if (*buffer == NULL)
+    {
+      *buffer_size = buflen;
+      *buffer = malloc (*buffer_size);
+    }
+
+  while (buffer != NULL
+	 && func (resbuf, *buffer, *buffer_size, &result,
+		  h_errnop) == ERANGE
+	 && (h_errnop == NULL || *h_errnop == NETDB_INTERNAL))
+    {
+      char *new_buf;
+      *buffer_size += buflen;
+      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;
+  __set_errno (save);
+
+  return result;
+}