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/* gdbmcount.c - get number of items in a gdbm file. */
/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 1993, 1994, 2007, 2011 Free Software Foundation, Inc.
GDBM is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GDBM 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GDBM. If not, see <http://www.gnu.org/licenses/>. */
/* Include system configuration before all else. */
#include "autoconf.h"
#include "gdbmdefs.h"
static int
compoff (const void *a, const void *b)
{
if (*(off_t*)a < *(off_t*)b)
return -1;
if (*(off_t*)a > *(off_t*)b)
return 1;
return 0;
}
int
gdbm_count (GDBM_FILE dbf, gdbm_count_t *pcount)
{
hash_bucket bucket;
int nbuckets = GDBM_DIR_COUNT (dbf);
off_t *sdir;
gdbm_count_t count = 0;
int i, last;
sdir = malloc (dbf->header->dir_size);
if (!sdir)
{
gdbm_errno = GDBM_MALLOC_ERROR;
return -1;
}
memcpy (sdir, dbf->dir, dbf->header->dir_size);
qsort (sdir, nbuckets, sizeof (off_t), compoff);
for (i = last = 0; i < nbuckets; i++)
{
if (i == 0 || sdir[i] != sdir[last])
{
if (_gdbm_read_bucket_at (dbf, sdir[i], &bucket, sizeof bucket))
return -1;
count += bucket.count;
last = i;
}
}
free (sdir);
*pcount = count;
return 0;
}
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