Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 142 insertions, 0 deletions

diff --git a/REORG.TODO/nss/nss_db/db-initgroups.c b/REORG.TODO/nss/nss_db/db-initgroups.c
new file mode 100644
index 0000000000..11e6052453
--- /dev/null
+++ b/REORG.TODO/nss/nss_db/db-initgroups.c
@@ -0,0 +1,142 @@
+/* Initgroups handling in nss_db module.
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gmail.com>.
+
+   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, see <http://www.gnu.org/licenses/>.  */
+
+#include <ctype.h>
+#include <errno.h>
+#include <grp.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/param.h>
+
+#include "nss_db.h"
+
+/* The hashing function we use.  */
+#include "../intl/hash-string.h"
+
+
+enum nss_status
+_nss_db_initgroups_dyn (const char *user, gid_t group, long int *start,
+			long int *size, gid_t **groupsp, long int limit,
+			int *errnop)
+{
+  struct nss_db_map state = { NULL, 0 };
+  enum nss_status status = internal_setent (_PATH_VARDB "group.db", &state);
+  if (status != NSS_STATUS_SUCCESS)
+    {
+      *errnop = errno;
+      return status;
+    }
+
+  const struct nss_db_header *header = state.header;
+  int i;
+  for (i = 0; i < header->ndbs; ++i)
+    if (header->dbs[i].id == ':')
+      break;
+  if (i == header->ndbs)
+    {
+      status = NSS_STATUS_UNAVAIL;
+      goto out;
+    }
+
+  const stridx_t *hashtable
+    = (const stridx_t *) ((const char *) header
+			  + header->dbs[i].hashoffset);
+  const char *valstrtab = (const char *) header + header->valstroffset;
+  size_t userlen = strlen (user);
+  uint32_t hashval = __hash_string (user);
+  size_t hidx = hashval % header->dbs[i].hashsize;
+  size_t hval2 = 1 + hashval % (header->dbs[i].hashsize - 2);
+
+  gid_t *groups = *groupsp;
+
+  status = NSS_STATUS_NOTFOUND;
+  while (hashtable[hidx] != ~((stridx_t) 0))
+    {
+      const char *valstr = valstrtab + hashtable[hidx];
+      while (isblank (*valstr))
+	++valstr;
+
+      if (strncmp (valstr, user, userlen) == 0 && isblank (valstr[userlen]))
+	{
+	  valstr += userlen + 1;
+	  while (isblank (*valstr))
+	    ++valstr;
+
+	  while (*valstr != '\0')
+	    {
+	      errno = 0;
+	      char *endp;
+	      unsigned long int n = strtoul (valstr, &endp, 10);
+	      if (*endp != ',' && *endp != '\0')
+		break;
+	      valstr = *endp == '\0' ? endp : endp + 1;
+
+	      if (n != ULONG_MAX || errno != ERANGE)
+		{
+		  /* Insert the group.  */
+		  if (*start == *size)
+		    {
+		      /* Need a bigger buffer.  */
+		      if (limit > 0 && *size == limit)
+			{
+			  /* We reached the maximum.  */
+			  status = NSS_STATUS_SUCCESS;
+			  goto out;
+			}
+
+		      long int newsize;
+		      if (limit <= 0)
+			newsize = 2 * *size;
+		      else
+			newsize = MIN (limit, 2 * *size);
+
+		      gid_t *newgroups = realloc (groups,
+						  newsize * sizeof (*groups));
+		      if (newgroups == NULL)
+			{
+			  *errnop = ENOMEM;
+			  status = NSS_STATUS_TRYAGAIN;
+			  goto out;
+			}
+
+		      *groupsp = groups = newgroups;
+		      *size = newsize;
+		    }
+
+		  groups[*start] = n;
+		  *start += 1;
+		}
+	    }
+
+	  status = NSS_STATUS_SUCCESS;
+	  break;
+	}
+
+      if ((hidx += hval2) >= header->dbs[i].hashsize)
+	hidx -= header->dbs[i].hashsize;
+    }
+
+ out:
+  internal_endent (&state);
+
+  return status;
+}