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-rw-r--r--nss/getXXent_r.c222
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diff --git a/nss/getXXent_r.c b/nss/getXXent_r.c
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+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+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 <libc-lock.h>
+
+#include "nsswitch.h"
+
+/*******************************************************************\
+|* Here we assume several symbols to be defined:		   *|
+|* 								   *|
+|* LOOKUP_TYPE   - the return type of the function		   *|
+|* 								   *|
+|* SETFUNC_NAME  - name of the non-reentrant setXXXent function	   *|
+|* 								   *|
+|* GETFUNC_NAME  - name of the non-reentrant getXXXent function	   *|
+|* 								   *|
+|* ENDFUNC_NAME  - name of the non-reentrant endXXXent function	   *|
+|* 								   *|
+|* DATABASE_NAME - name of the database the function accesses	   *|
+|*		   (e.g., host, services, ...)			   *|
+|* 								   *|
+|* Optionally the following vars can be defined:		   *|
+|* 								   *|
+|* STAYOPEN      - variable declaration for setXXXent function	   *|
+|* 								   *|
+|* STAYOPEN_VAR  - variable name for setXXXent function		   *|
+|* 								   *|
+|* 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.  */
+#define REENTRANT_GETNAME APPEND_R (GETFUNC_NAME)
+#define APPEND_R(name) APPEND_R1 (name)
+#define APPEND_R1(name) name##_r
+
+#define SETFUNC_NAME_STRING STRINGIZE (SETFUNC_NAME)
+#define GETFUNC_NAME_STRING STRINGIZE (GETFUNC_NAME)
+#define ENDFUNC_NAME_STRING STRINGIZE (ENDFUNC_NAME)
+#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
+#define STRINGIZE(name) STRINGIZE1 (name)
+#define STRINGIZE1(name) #name
+
+#define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup)
+#define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
+#define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
+
+/* 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
+#else
+# define H_ERRNO_PARM
+# define H_ERRNO_VAR
+#endif
+
+/* Some databases take the `stayopen' flag.  */
+#ifndef STAYOPEN
+#define STAYOPEN void
+#define STAYOPEN_VAR
+#endif
+
+/* Prototype for the setXXXent functions we use here.  */
+typedef int (*set_function) (STAYOPEN);
+
+/* Prototype for the endXXXent functions we use here.  */
+typedef int (*end_function) (void);
+
+/* Prototype for the setXXXent functions we use here.  */
+typedef int (*get_function) (LOOKUP_TYPE *, char *, int H_ERRNO_PARM);
+
+
+/* This handle for the NSS data base is shared between all
+   set/get/endXXXent functions.  */
+static service_user *nip;
+/* Remember the first service_entry, it's always the same.  */
+static service_user *startp;
+
+/* Protect above variable against multiple uses at the same time.  */
+__libc_lock_define_initialized (static, lock);
+
+/* The lookup function for the first entry of this service.  */
+extern int DB_LOOKUP_FCT (service_user **nip, const char *name, void **fctp);
+
+
+void
+APPEND_R (SETFUNC_NAME) (STAYOPEN)
+{
+  set_function fct;
+  int no_more;
+
+#ifdef NEED__RES
+  if ((_res.options & RES_INIT) == 0 && res_init () == -1)
+    {
+      h_errno = NETDB_INTERNAL;
+      return NULL;
+    }
+#endif /* need _res */
+
+  __libc_lock_lock (lock);
+
+  if (startp == NULL)
+    {
+      no_more = DB_LOOKUP_FCT (&nip, SETFUNC_NAME_STRING, (void **) &fct);
+      startp = no_more == 0 ? (service_user *) -1 : nip;
+    }
+  else
+    no_more = (nip = startp) != (service_user *) -1;
+
+  /* Cycle through all the services and run their setXXent functions.  */
+  while (! no_more)
+    {
+      /* Ignore status, we force check in __NSS_NEXT.  */
+      (void) (*fct) (STAYOPEN_VAR);
+
+      no_more = __nss_next (&nip, SETFUNC_NAME_STRING, (void **) &fct, 0, 1);
+    }
+
+  __libc_lock_unlock (lock);
+}
+
+
+void
+APPEND_R (ENDFUNC_NAME) (void)
+{
+  end_function fct;
+  int no_more;
+
+#ifdef NEED__RES
+  if ((_res.options & RES_INIT) == 0 && res_init () == -1)
+    {
+      h_errno = NETDB_INTERNAL;
+      return NULL;
+    }
+#endif /* need _res */
+
+  __libc_lock_lock (lock);
+
+  if (startp == NULL)
+    {
+      no_more = DB_LOOKUP_FCT (&nip, SETFUNC_NAME_STRING, (void **) &fct);
+      startp = no_more == 0 ? (service_user *) -1 : nip;
+    }
+  else
+    no_more = (nip = startp) != (service_user *) -1;
+
+  /* Cycle through all the services and run their endXXent functions.  */
+  while (no_more == 0)
+    {
+      /* Ignore status, we force check in __NSS_NEXT.  */
+      (void) (*fct) ();
+
+      no_more = __nss_next (&nip, ENDFUNC_NAME_STRING, (void **) &fct, 0, 1);
+    }
+
+  __libc_lock_unlock (lock);
+}
+
+
+LOOKUP_TYPE *
+REENTRANT_GETNAME (LOOKUP_TYPE *result, char *buffer, int buflen H_ERRNO_PARM)
+{
+  get_function fct;
+  int no_more;
+  enum nss_status status = NSS_STATUS_NOTFOUND;
+
+#ifdef NEED__RES
+  if ((_res.options & RES_INIT) == 0 && res_init () == -1)
+    {
+      h_errno = NETDB_INTERNAL;
+      return NULL;
+    }
+#endif /* need _res */
+
+  __libc_lock_lock (lock);
+
+  if (nip)
+    /* Continuing a walk-through started before.  */
+    no_more = 0;
+  else
+    {
+      if (startp == NULL)
+	{
+	  no_more = DB_LOOKUP_FCT (&nip, SETFUNC_NAME_STRING, (void **) &fct);
+	  startp = no_more == 0 ? (service_user *) -1 : nip;
+	}
+      else
+	no_more = (nip = startp) != (service_user *) -1;
+
+      if (no_more != 0)
+	status = NSS_STATUS_UNAVAIL;
+    }
+
+  while (no_more == 0)
+    {
+      status = (*fct) (result, buffer, buflen H_ERRNO_VAR);
+
+      no_more = __nss_next (&nip, GETFUNC_NAME_STRING, (void **) &fct,
+			    status, 0);
+    }
+
+  __libc_lock_unlock (lock);
+
+  return status == NSS_STATUS_SUCCESS ? result : NULL;
+}