* nis/nss-default.c (vars): Add SETENT_BATCH_READ.

	* nis/nss: Document SETENT_BATCH_READ.
	* nis/libnsl.h: Define NSS_FLAG_SETENT_BATCH_READ.
	* nis/nss_nis/nis-service.c (saveit): Don't add NUL byte if the
	string is already NUL terminated.
	(internal_nis_endservent): No need to return anything.  Change callers.
	(internal_nis_setservent): One more initialization.
	* nis/nss_nis/nis-pwd.c: Support SETENT_BATCH_READ option.
	* nis/nss_nis/nis-grp.c: Likewise.

	* nis/nss-default.c (init): Rewrite parser to get the variables

6 files changed, 463 insertions, 90 deletions

diff --git a/nis/libnsl.h b/nis/libnsl.h
index e45f24d..9f78469 100644
--- a/nis/libnsl.h
+++ b/nis/libnsl.h
@@ -18,6 +18,7 @@
 
 #define NSS_FLAG_NETID_AUTHORITATIVE	1
 #define NSS_FLAG_SERVICES_AUTHORITATIVE	2
+#define NSS_FLAG_SETENT_BATCH_READ	4
 
 
 /* Get current set of default flags.  */
diff --git a/nis/nss b/nis/nss
index 4f65f81..aab40ab 100644
--- a/nis/nss
+++ b/nis/nss
@@ -1,7 +1,7 @@
 # /etc/default/nss
 # This file can theoretically contain a bunch of customization variables
-# for Name Service Switch in the GNU C library.  For now there are only two
-# variables:
+# for Name Service Switch in the GNU C library.  For now there are only
+# three variables:
 #
 # NETID_AUTHORITATIVE
 #   If set to TRUE, the initgroups() function will accept the information
@@ -18,3 +18,11 @@
 #   primary service names and service aliases.  The system administrator
 #   has to make sure it is correctly generated.
 #SERVICES_AUTHORITATIVE=TRUE
+#
+# SETENT_BATCH_READ
+#  If set to TRUE, various setXXent() functions will read the entire
+#  database at once and then hand out the requests one by one from
+#  memory with every getXXent() call.  Otherwise each getXXent() call
+#  might result into a network communication with the server to get
+#  the next entry.
+#SETENT_BATCH_READ=TRUE
diff --git a/nis/nss-default.c b/nis/nss-default.c
index e3a228d..577f7c2 100644
--- a/nis/nss-default.c
+++ b/nis/nss-default.c
@@ -45,7 +45,8 @@ static const struct
   {
 #define STRNLEN(s) s, sizeof (s) - 1
     { STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE },
-    { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE }
+    { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE },
+    { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ }
   };
 #define nvars (sizeof (vars) / sizeof (vars[0]))
 
diff --git a/nis/nss_nis/nis-grp.c b/nis/nss_nis/nis-grp.c
index 68f3ced..10af019 100644
--- a/nis/nss_nis/nis-grp.c
+++ b/nis/nss_nis/nis-grp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996-1999, 2001-2003, 2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 1996-1999, 2001-2004, 2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996.
 
@@ -17,20 +17,17 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-/* The following is an ugly trick to avoid a prototype declaration for
-   _nss_nis_endgrent.  */
-#define _nss_nis_endgrent _nss_nis_endgrent_XXX
-#include <grp.h>
-#undef _nss_nis_endgrent
 #include <ctype.h>
 #include <errno.h>
+#include <grp.h>
+#include <nss.h>
 #include <string.h>
 #include <bits/libc-lock.h>
 #include <rpcsvc/yp.h>
 #include <rpcsvc/ypclnt.h>
 
 #include "nss-nis.h"
+#include <libnsl.h>
 
 /* Get the declaration of the parser function.  */
 #define ENTNAME grent
@@ -45,11 +42,84 @@ static bool_t new_start = 1;
 static char *oldkey;
 static int oldkeylen;
 
-enum nss_status
-_nss_nis_setgrent (int stayopen)
+struct response_t
 {
-  __libc_lock_lock (lock);
+  struct response_t *next;
+  size_t size;
+  char mem[0];
+};
+
+typedef struct intern_t
+{
+  struct response_t *start;
+  struct response_t *next;
+  size_t offset;
+} intern_t;
+
+static intern_t intern;
+
+
+static int
+saveit (int instatus, char *inkey, int inkeylen, char *inval,
+        int invallen, char *indata)
+{
+  if (instatus != YP_TRUE)
+    return 1;
+
+  if (inkey && inkeylen > 0 && inval && invallen > 0)
+    {
+      struct response_t *bucket = intern.next;
+
+      if (__builtin_expect (bucket == NULL, 0))
+	{
+#define MINSIZE 4096 - 4 * sizeof (void *)
+	  const size_t minsize = MAX (MINSIZE, 2 * (invallen + 1));
+	  bucket = malloc (sizeof (struct response_t) + minsize);
+	  if (bucket == NULL)
+	    /* We have no error code for out of memory.  */
+	    return 1;
+
+	  bucket->next = NULL;
+	  bucket->size = minsize;
+	  intern.start = intern.next = bucket;
+	  intern.offset = 0;
+	}
+      else if (__builtin_expect (invallen + 1 > bucket->size - intern.offset,
+				 0))
+	{
+	  /* We need a new (larger) buffer.  */
+	  const size_t newsize = 2 * MAX (bucket->size, invallen + 1);
+	  struct response_t *newp = malloc (sizeof (struct response_t)
+					    + newsize);
+	  if (newp == NULL)
+	    /* We have no error code for out of memory.  */
+	    return 1;
+
+	  /* Mark the old bucket as full.  */
+	  bucket->size = intern.offset;
+
+	  newp->next = NULL;
+	  newp->size = newsize;
+	  bucket = intern.next = bucket->next = newp;
+	  intern.offset = 0;
+	}
+
+      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
+      if (__builtin_expect (p[-1] != '\0', 0))
+	{
+	  *p = '\0';
+	  ++invallen;
+	}
+      intern.offset += invallen;
+    }
+
+  return 0;
+}
+
 
+static void
+internal_nis_endgrent (void)
+{
   new_start = 1;
   if (oldkey != NULL)
     {
@@ -58,21 +128,86 @@ _nss_nis_setgrent (int stayopen)
       oldkeylen = 0;
     }
 
+  struct response_t *curr = intern.next;
+
+  while (curr != NULL)
+    {
+      struct response_t *last = curr;
+      curr = curr->next;
+      free (last);
+    }
+
+  intern.next = intern.start = NULL;
+}
+
+
+enum nss_status
+_nss_nis_endgrent (void)
+{
+  __libc_lock_lock (lock);
+
+  internal_nis_endgrent ();
+
   __libc_lock_unlock (lock);
 
   return NSS_STATUS_SUCCESS;
 }
-/* Make _nss_nis_endgrent an alias of _nss_nis_setgrent.  We do this
-   even though the prototypes don't match.  The argument of setgrent
-   is not used so this makes no difference.  */
-strong_alias (_nss_nis_setgrent, _nss_nis_endgrent)
+
+
+enum nss_status
+internal_nis_setgrent (void)
+{
+  /* We have to read all the data now.  */
+  char *domain;
+  if (__builtin_expect (yp_get_default_domain (&domain), 0))
+    return NSS_STATUS_UNAVAIL;
+
+  struct ypall_callback ypcb;
+
+  ypcb.foreach = saveit;
+  ypcb.data = NULL;
+  enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb));
+
+
+  /* Mark the last buffer as full.  */
+  if (intern.next != NULL)
+    intern.next->size = intern.offset;
+
+  intern.next = intern.start;
+  intern.offset = 0;
+
+  return status;
+}
+
+
+enum nss_status
+_nss_nis_setgrent (int stayopen)
+{
+  enum nss_status result = NSS_STATUS_SUCCESS;
+
+  __libc_lock_lock (lock);
+
+  internal_nis_endgrent ();
+
+  if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
+    result = internal_nis_setgrent ();
+
+  __libc_lock_unlock (lock);
+
+  return result;
+}
+
 
 static enum nss_status
 internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
 			 int *errnop)
 {
-  char *domain;
-  if (__builtin_expect (yp_get_default_domain (&domain), 0))
+  /* If we read the entire database at setpwent time we just iterate
+     over the data we have in memory.  */
+  bool batch_read = intern.start != NULL;
+
+  char *domain = NULL;
+  if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
     return NSS_STATUS_UNAVAIL;
 
   /* Get the next entry until we found a correct one. */
@@ -83,23 +218,62 @@ internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
       char *outkey;
       int len;
       int keylen;
-      int yperr;
 
-      if (new_start)
-        yperr = yp_first (domain, "group.byname", &outkey, &keylen, &result,
-			  &len);
-      else
-        yperr = yp_next (domain, "group.byname", oldkey, oldkeylen, &outkey,
-			 &keylen, &result, &len);
+      if (batch_read)
+	{
+	  struct response_t *bucket;
 
-      if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
-        {
-	  enum nss_status retval = yperr2nss (yperr);
+	handle_batch_read:
+	  bucket = intern.next;
 
-          if (retval == NSS_STATUS_TRYAGAIN)
-            *errnop = errno;
-          return retval;
-        }
+	  if (__builtin_expect (intern.offset >= bucket->size, 0))
+	    {
+	      if (bucket->next == NULL)
+		return NSS_STATUS_NOTFOUND;
+
+	      /* We look at all the content in the current bucket.  Go on
+		 to the next.  */
+	      bucket = intern.next = bucket->next;
+	      intern.offset = 0;
+	    }
+
+	  for (result = &bucket->mem[intern.offset]; isspace (*result);
+	       ++result)
+	    ++intern.offset;
+
+	  len = strlen (result);
+	}
+      else
+	{
+	  int yperr;
+
+	  if (new_start)
+	    {
+	      /* Maybe we should read the database in one piece.  */
+	      if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
+		  && internal_nis_setgrent () == NSS_STATUS_SUCCESS
+		  && intern.start != NULL)
+		{
+		  batch_read = true;
+		  goto handle_batch_read;
+		}
+
+	      yperr = yp_first (domain, "group.byname", &outkey, &keylen,
+				&result, &len);
+	    }
+	  else
+	    yperr = yp_next (domain, "group.byname", oldkey, oldkeylen,
+			     &outkey, &keylen, &result, &len);
+
+	  if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
+	    {
+	      enum nss_status retval = yperr2nss (yperr);
+
+	      if (retval == NSS_STATUS_TRYAGAIN)
+		*errnop = errno;
+	      return retval;
+	    }
+	}
 
       if (__builtin_expect ((size_t) (len + 1) > buflen, 0))
         {
@@ -112,7 +286,8 @@ internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
       buffer[len] = '\0';
       while (isspace (*p))
         ++p;
-      free (result);
+      if (!batch_read)
+	free (result);
 
       parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen,
 					  errnop);
@@ -123,10 +298,15 @@ internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen,
 	  return NSS_STATUS_TRYAGAIN;
 	}
 
-      free (oldkey);
-      oldkey = outkey;
-      oldkeylen = keylen;
-      new_start = 0;
+      if (batch_read)
+	intern.offset += len + 1;
+      else
+	{
+	  free (oldkey);
+	  oldkey = outkey;
+	  oldkeylen = keylen;
+	  new_start = 0;
+	}
     }
   while (parse_res < 1);
 
diff --git a/nis/nss_nis/nis-pwd.c b/nis/nss_nis/nis-pwd.c
index 457574a..a996b04 100644
--- a/nis/nss_nis/nis-pwd.c
+++ b/nis/nss_nis/nis-pwd.c
@@ -17,20 +17,18 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-/* The following is an ugly trick to avoid a prototype declaration for
-   _nss_nis_endpwent.  */
-#define _nss_nis_endpwent _nss_nis_endpwent_XXX
-#include <pwd.h>
-#undef _nss_nis_endpwent
+#include <assert.h>
 #include <ctype.h>
 #include <errno.h>
+#include <nss.h>
+#include <pwd.h>
 #include <string.h>
 #include <bits/libc-lock.h>
 #include <rpcsvc/yp.h>
 #include <rpcsvc/ypclnt.h>
 
 #include "nss-nis.h"
+#include <libnsl.h>
 
 /* Get the declaration of the parser function.  */
 #define ENTNAME pwent
@@ -45,11 +43,84 @@ static bool_t new_start = 1;
 static char *oldkey;
 static int oldkeylen;
 
-enum nss_status
-_nss_nis_setpwent (int stayopen)
+struct response_t
 {
-  __libc_lock_lock (lock);
+  struct response_t *next;
+  size_t size;
+  char mem[0];
+};
+
+typedef struct intern_t
+{
+  struct response_t *start;
+  struct response_t *next;
+  size_t offset;
+} intern_t;
+
+static intern_t intern;
+
+
+static int
+saveit (int instatus, char *inkey, int inkeylen, char *inval,
+        int invallen, char *indata)
+{
+  if (instatus != YP_TRUE)
+    return 1;
+
+  if (inkey && inkeylen > 0 && inval && invallen > 0)
+    {
+      struct response_t *bucket = intern.next;
+
+      if (__builtin_expect (bucket == NULL, 0))
+	{
+#define MINSIZE 4096 - 4 * sizeof (void *)
+	  const size_t minsize = MAX (MINSIZE, 2 * (invallen + 1));
+	  bucket = malloc (sizeof (struct response_t) + minsize);
+	  if (bucket == NULL)
+	    /* We have no error code for out of memory.  */
+	    return 1;
+
+	  bucket->next = NULL;
+	  bucket->size = minsize;
+	  intern.start = intern.next = bucket;
+	  intern.offset = 0;
+	}
+      else if (__builtin_expect (invallen + 1 > bucket->size - intern.offset,
+				 0))
+	{
+	  /* We need a new (larger) buffer.  */
+	  const size_t newsize = 2 * MAX (bucket->size, invallen + 1);
+	  struct response_t *newp = malloc (sizeof (struct response_t)
+					    + newsize);
+	  if (newp == NULL)
+	    /* We have no error code for out of memory.  */
+	    return 1;
+
+	  /* Mark the old bucket as full.  */
+	  bucket->size = intern.offset;
+
+	  newp->next = NULL;
+	  newp->size = newsize;
+	  bucket = intern.next = bucket->next = newp;
+	  intern.offset = 0;
+	}
+
+      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
+      if (__builtin_expect (p[-1] != '\0', 0))
+	{
+	  *p = '\0';
+	  ++invallen;
+	}
+      intern.offset += invallen;
+    }
 
+  return 0;
+}
+
+
+static void
+internal_nis_endpwent (void)
+{
   new_start = 1;
   if (oldkey != NULL)
     {
@@ -58,21 +129,86 @@ _nss_nis_setpwent (int stayopen)
       oldkeylen = 0;
     }
 
+  struct response_t *curr = intern.next;
+
+  while (curr != NULL)
+    {
+      struct response_t *last = curr;
+      curr = curr->next;
+      free (last);
+    }
+
+  intern.next = intern.start = NULL;
+}
+
+
+enum nss_status
+_nss_nis_endpwent (void)
+{
+  __libc_lock_lock (lock);
+
+  internal_nis_endpwent ();
+
   __libc_lock_unlock (lock);
 
   return NSS_STATUS_SUCCESS;
 }
-/* Make _nss_nis_endpwent an alias of _nss_nis_setpwent.  We do this
-   even though the prototypes don't match.  The argument of setpwent
-   is not used so this makes no difference.  */
-strong_alias (_nss_nis_setpwent, _nss_nis_endpwent)
+
+
+enum nss_status
+internal_nis_setpwent (void)
+{
+  /* We have to read all the data now.  */
+  char *domain;
+  if (__builtin_expect (yp_get_default_domain (&domain), 0))
+    return NSS_STATUS_UNAVAIL;
+
+  struct ypall_callback ypcb;
+
+  ypcb.foreach = saveit;
+  ypcb.data = NULL;
+  enum nss_status status = yperr2nss (yp_all (domain, "passwd.byname", &ypcb));
+
+
+  /* Mark the last buffer as full.  */
+  if (intern.next != NULL)
+    intern.next->size = intern.offset;
+
+  intern.next = intern.start;
+  intern.offset = 0;
+
+  return status;
+}
+
+
+enum nss_status
+_nss_nis_setpwent (int stayopen)
+{
+  enum nss_status result = NSS_STATUS_SUCCESS;
+
+  __libc_lock_lock (lock);
+
+  internal_nis_endpwent ();
+
+  if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
+    result = internal_nis_setpwent ();
+
+  __libc_lock_unlock (lock);
+
+  return result;
+}
+
 
 static enum nss_status
 internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 			 int *errnop)
 {
-  char *domain;
-  if (__builtin_expect (yp_get_default_domain (&domain), 0))
+  /* If we read the entire database at setpwent time we just iterate
+     over the data we have in memory.  */
+  bool batch_read = intern.start != NULL;
+
+  char *domain = NULL;
+  if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
     return NSS_STATUS_UNAVAIL;
 
   /* Get the next entry until we found a correct one. */
@@ -83,23 +219,62 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
       char *outkey;
       int len;
       int keylen;
-      int yperr;
 
-      if (new_start)
-        yperr = yp_first (domain, "passwd.byname", &outkey, &keylen, &result,
-			  &len);
+      if (batch_read)
+	{
+	  struct response_t *bucket;
+
+	handle_batch_read:
+	  bucket = intern.next;
+
+	  if (__builtin_expect (intern.offset >= bucket->size, 0))
+	    {
+	      if (bucket->next == NULL)
+		return NSS_STATUS_NOTFOUND;
+
+	      /* We look at all the content in the current bucket.  Go on
+		 to the next.  */
+	      bucket = intern.next = bucket->next;
+	      intern.offset = 0;
+	    }
+
+	  for (result = &bucket->mem[intern.offset]; isspace (*result);
+	       ++result)
+	    ++intern.offset;
+
+	  len = strlen (result);
+	}
       else
-        yperr = yp_next (domain, "passwd.byname", oldkey, oldkeylen, &outkey,
-			 &keylen, &result, &len);
+	{
+	  int yperr;
 
-      if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
-        {
-	  enum nss_status retval = yperr2nss (yperr);
+	  if (new_start)
+	    {
+	      /* Maybe we should read the database in one piece.  */
+	      if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
+		  && internal_nis_setpwent () == NSS_STATUS_SUCCESS
+		  && intern.start != NULL)
+		{
+		  batch_read = true;
+		  goto handle_batch_read;
+		}
+
+	      yperr = yp_first (domain, "passwd.byname", &outkey, &keylen,
+				&result, &len);
+	    }
+	  else
+	    yperr = yp_next (domain, "passwd.byname", oldkey, oldkeylen,
+			     &outkey, &keylen, &result, &len);
+
+	  if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
+	    {
+	      enum nss_status retval = yperr2nss (yperr);
 
-          if (retval == NSS_STATUS_TRYAGAIN)
-            *errnop = errno;
-          return retval;
-        }
+	      if (retval == NSS_STATUS_TRYAGAIN)
+		*errnop = errno;
+	      return retval;
+	    }
+	}
 
       /* Check for adjunct style secret passwords.  They can be
 	 recognized by a password starting with "##".  */
@@ -140,10 +315,10 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 	      return NSS_STATUS_TRYAGAIN;
 	    }
 
-	  __mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, result, namelen),
-					   ":", 1),
-				encrypted, endp - encrypted),
-		     p, restlen + 1);
+	  mempcpy (mempcpy (mempcpy (mempcpy (buffer, result, namelen),
+				     ":", 1),
+			    encrypted, endp - encrypted),
+		   p, restlen + 1);
 	  p = buffer;
 
 	  free (result2);
@@ -158,13 +333,14 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 	      return NSS_STATUS_TRYAGAIN;
 	    }
 
-	  p = strncpy (buffer, result, len);
-	  buffer[len] = '\0';
+	  p = buffer;
+	  *((char *) mempcpy (buffer, result, len)) = '\0';
 	}
 
       while (isspace (*p))
         ++p;
-      free (result);
+      if (!batch_read)
+	free (result);
 
       parse_res = _nss_files_parse_pwent (p, pwd, (void *) buffer, buflen,
 					  errnop);
@@ -175,10 +351,15 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 	  return NSS_STATUS_TRYAGAIN;
 	}
 
-      free (oldkey);
-      oldkey = outkey;
-      oldkeylen = keylen;
-      new_start = 0;
+      if (batch_read)
+	intern.offset += len + 1;
+      else
+	{
+	  free (oldkey);
+	  oldkey = outkey;
+	  oldkeylen = keylen;
+	  new_start = 0;
+	}
     }
   while (parse_res < 1);
 
diff --git a/nis/nss_nis/nis-service.c b/nis/nss_nis/nis-service.c
index f5d886f..f705ff7 100644
--- a/nis/nss_nis/nis-service.c
+++ b/nis/nss_nis/nis-service.c
@@ -110,9 +110,13 @@ saveit (int instatus, char *inkey, int inkeylen, char *inval,
 	  intern.offset = 0;
 	}
 
-      *((char *) mempcpy (&bucket->mem[intern.offset], inval, invallen))
-	= '\0';
-      intern.offset += invallen + 1;
+      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
+      if (__builtin_expect (p[-1] != '\0', 0))
+	{
+	  *p = '\0';
+	  ++invallen;
+	}
+      intern.offset += invallen;
     }
 
   return 0;
@@ -177,7 +181,7 @@ dosearch (int instatus, char *inkey, int inkeylen, char *inval,
   return 0;
 }
 
-static enum nss_status
+static void
 internal_nis_endservent (void)
 {
   struct response_t *curr = intern.next;
@@ -190,22 +194,18 @@ internal_nis_endservent (void)
     }
 
   intern.next = intern.start = NULL;
-
-  return NSS_STATUS_SUCCESS;
 }
 
 enum nss_status
 _nss_nis_endservent (void)
 {
-  enum nss_status status;
-
   __libc_lock_lock (lock);
 
-  status = internal_nis_endservent ();
+  internal_nis_endservent ();
 
   __libc_lock_unlock (lock);
 
-  return status;
+  return NSS_STATUS_SUCCESS;
 }
 
 static enum nss_status
@@ -218,16 +218,18 @@ internal_nis_setservent (void)
   if (yp_get_default_domain (&domainname))
     return NSS_STATUS_UNAVAIL;
 
-  (void) internal_nis_endservent ();
+  internal_nis_endservent ();
 
   ypcb.foreach = saveit;
   ypcb.data = NULL;
   status = yperr2nss (yp_all (domainname, "services.byname", &ypcb));
 
   /* Mark the last buffer as full.  */
-  intern.next->size = intern.offset;
+  if (intern.next != NULL)
+    intern.next->size = intern.offset;
 
   intern.next = intern.start;
+  intern.offset = 0;
 
   return status;
 }
@@ -262,7 +264,7 @@ internal_nis_getservent_r (struct servent *serv, char *buffer,
     {
       struct response_t *bucket = intern.next;
 
-      if (intern.offset >= bucket->size)
+      if (__builtin_expect (intern.offset >= bucket->size, 0))
 	{
 	  if (bucket->next == NULL)
 	    return NSS_STATUS_NOTFOUND;