.
[kopensolaris-gnu/glibc.git] / nss / getXXbyYY.c
index a99b68f..a9f1cfd 100644 (file)
@@ -1,45 +1,51 @@
-/* Copyright (C) 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1996,1997,1998,1999,2000,2001 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 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
-Library General Public License for more details.
+   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 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.  */
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
 
-#include "../nss/nsswitch.h"
+#include <assert.h>
+#include <errno.h>
+#include <bits/libc-lock.h>
+#include <stdlib.h>
+#include <resolv.h>
+
+#include "nsswitch.h"
 
 /*******************************************************************\
 |* Here we assume several symbols to be defined:                  *|
-|*                                                                *|
+|*                                                                *|
 |* LOOKUP_TYPE   - the return type of the function                *|
-|*                                                                *|
+|*                                                                *|
 |* FUNCTION_NAME - name of the non-reentrant function             *|
-|*                                                                *|
+|*                                                                *|
 |* DATABASE_NAME - name of the database the function accesses     *|
 |*                (e.g., host, services, ...)                     *|
-|*                                                                *|
+|*                                                                *|
 |* ADD_PARAMS    - additional parameter, can vary in number       *|
-|*                                                                *|
+|*                                                                *|
 |* ADD_VARIABLES - names of additional parameter                  *|
-|*                                                                *|
+|*                                                                *|
 |* BUFLEN       - length of buffer allocated for the non          *|
 |*                reentrant version                               *|
-|*                                                                *|
+|*                                                                *|
 |* Optionally the following vars can be defined:                  *|
-|*                                                                *|
+|*                                                                *|
 |* NEED_H_ERRNO  - an extra parameter will be passed to point to   *|
 |*                the global `h_errno' variable.                  *|
-|*                                                                *|
+|*                                                                *|
 \*******************************************************************/
 
 /* To make the real sources a bit prettier.  */
@@ -52,24 +58,107 @@ Boston, MA 02111-1307, USA.  */
 /* Sometimes we need to store error codes in the `h_errno' variable.  */
 #ifdef NEED_H_ERRNO
 # define H_ERRNO_PARM , int *h_errnop
-# define H_ERRNO_VAR , &h_errno
+# define H_ERRNO_VAR , &h_errno_tmp
+# define H_ERRNO_VAR_P &h_errno_tmp
 #else
 # define H_ERRNO_PARM
 # define H_ERRNO_VAR
+# define H_ERRNO_VAR_P NULL
+#endif
+
+#ifndef HAVE_TYPE
+# define TYPE_VAR_P NULL
+# define FLAGS_VAR 0
 #endif
 
+#ifdef HAVE_AF
+# define AF_VAR_P &af
+#else
+# define AF_VAR_P NULL
+#endif
 
 /* Prototype for reentrant version we use here.  */
-extern LOOKUP_TYPE *INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *result,
-                                              char *buffer, int buflen
-                                              H_ERRNO_PARM);
+extern int INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf,
+                                     char *buffer, size_t buflen,
+                                     LOOKUP_TYPE **result H_ERRNO_PARM);
+
+/* We need to protect the dynamic buffer handling.  */
+__libc_lock_define_initialized (static, lock);
+
+/* This points to the static buffer used.  */
+libc_freeres_ptr (static char *buffer);
+
 
 LOOKUP_TYPE *
 FUNCTION_NAME (ADD_PARAMS)
 {
-  static LOOKUP_TYPE result;
-  static char buffer[BUFLEN];
+  static size_t buffer_size;
+  static LOOKUP_TYPE resbuf;
+  LOOKUP_TYPE *result;
+  int save;
+#ifdef NEED_H_ERRNO
+  int h_errno_tmp = 0;
+#endif
+
+  /* Get lock.  */
+  __libc_lock_lock (lock);
+
+  if (buffer == NULL)
+    {
+      buffer_size = BUFLEN;
+      buffer = malloc (buffer_size);
+    }
+
+#ifdef HANDLE_DIGITS_DOTS
+  if (buffer != NULL)
+    {
+      if (__nss_hostname_digits_dots (name, &resbuf, &buffer,
+                                     &buffer_size,
+                                     0, &result, NULL, TYPE_VAR_P,
+                                     FLAGS_VAR, AF_VAR_P,
+                                     H_ERRNO_VAR_P))
+       goto done;
+    }
+#endif
+
+  while (buffer != NULL
+        && (INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &resbuf, buffer,
+                                       buffer_size, &result H_ERRNO_VAR)
+            == ERANGE)
+#ifdef NEED_H_ERRNO
+        && h_errno_tmp == NETDB_INTERNAL
+#endif
+        )
+    {
+      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;
+
+#ifdef HANDLE_DIGITS_DOTS
+done:
+#endif
+  /* Release lock.  Preserve error value.  */
+  save = errno;
+  __libc_lock_unlock (lock);
+  __set_errno (save);
+
+#ifdef NEED_H_ERRNO
+  if (h_errno_tmp != 0)
+    __set_h_errno (h_errno_tmp);
+#endif
 
-  return INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, &result, buffer,
-                                   BUFLEN H_ERRNO_VAR);
+  return result;
 }