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gdbmfetch.c
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C/C++ Source or Header
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1993-12-26
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82 lines
/* gdbmfetch.c - Find a key and return the associated data. */
/* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
Copyright (C) 1990, 1991, 1993 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 2, 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; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
You may contact the author by:
e-mail: phil@cs.wwu.edu
us-mail: Philip A. Nelson
Computer Science Department
Western Washington University
Bellingham, WA 98226
*************************************************************************/
/* AIX demands this be the very first thing in the file. */
#if !defined(__GNUC__) && defined(_AIX)
#pragma alloca
#endif
/* include system configuration before all else. */
#include "autoconf.h"
#include "gdbmdefs.h"
#include "gdbmerrno.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 (dbf, key)
gdbm_file_info *dbf;
datum key;
{
datum return_val; /* The return value. */
int elem_loc; /* The location in the bucket. */
char *find_data; /* Returned from find_key. */
word_t hash_val; /* Returned from find_key. */
/* Set the default return value. */
return_val.dptr = NULL;
return_val.dsize = 0;
/* Initialize the gdbm_errno variable. */
gdbm_errno = GDBM_NO_ERROR;
/* Find the key and return a pointer to the data. */
elem_loc = _gdbm_findkey (dbf, key, &find_data, &hash_val);
/* 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_fatal (dbf, "malloc error");
bcopy (find_data, return_val.dptr, return_val.dsize);
}
/* Check for an error and return. */
if (return_val.dptr == NULL) gdbm_errno = GDBM_ITEM_NOT_FOUND;
return return_val;
}