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/* gdbmfetch.c - Find a key and return the associated data. */
/* This file is part of GDBM, the GNU data base manager.
Copyright (C) 1990-1991, 1993, 2007, 2011, 2013, 2016-2018 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"
/* Look up a given KEY and return the information associated with that KEY.
The pointer in the structure that is returned is a pointer to dynamically
allocated memory block. */
datum
gdbm_fetch (GDBM_FILE dbf, datum key)
{
datum return_val; /* The return value. */
int elem_loc; /* The location in the bucket. */
char *find_data; /* Returned from find_key. */
GDBM_DEBUG_DATUM (GDBM_DEBUG_READ, key, "%s: fetching key:", dbf->name);
/* Set the default return value. */
return_val.dptr = NULL;
return_val.dsize = 0;
/* Return immediately if the database needs recovery */
GDBM_ASSERT_CONSISTENCY (dbf, return_val);
/* Initialize the gdbm_errno variable. */
gdbm_set_errno (dbf, GDBM_NO_ERROR, FALSE);
/* Find the key and return a pointer to the data. */
elem_loc = _gdbm_findkey (dbf, key, &find_data, NULL);
/* Copy the data if the key was found. */
if (elem_loc >= 0)
{
/* This is the item. Return the associated data. */
return_val.dsize = dbf->bucket->h_table[elem_loc].data_size;
if (return_val.dsize == 0)
return_val.dptr = (char *) malloc (1);
else
return_val.dptr = (char *) malloc (return_val.dsize);
if (return_val.dptr == NULL)
{
GDBM_SET_ERRNO2 (dbf, GDBM_MALLOC_ERROR, FALSE, GDBM_DEBUG_READ);
return return_val;
}
memcpy (return_val.dptr, find_data, return_val.dsize);
GDBM_DEBUG_DATUM (GDBM_DEBUG_READ, return_val,
"%s: found", dbf->name);
}
else
GDBM_DEBUG (GDBM_DEBUG_READ, "%s: key not found", dbf->name);
return return_val;
}
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