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/*
Unix SMB/Netbios implementation.
Version 3.0
tdb utility functions
Copyright (C) Andrew Tridgell 1992-1998
This program 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 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/* these are little tdb utility functions that are meant to make
dealing with a tdb database a little less cumbersome in Samba */
/* lock a chain by string */
int tdb_lock_bystring(TDB_CONTEXT *tdb, char *keyval)
{
TDB_DATA key;
key.dptr = keyval;
key.dsize = strlen(keyval)+1;
return tdb_chainlock(tdb, key);
}
/* unlock a chain by string */
void tdb_unlock_bystring(TDB_CONTEXT *tdb, char *keyval)
{
TDB_DATA key;
key.dptr = keyval;
key.dsize = strlen(keyval)+1;
tdb_chainunlock(tdb, key);
}
/* lock a chain by string key */
/* fetch a value by a arbitrary blob key, return -1 if not found */
int tdb_fetch_int_byblob(TDB_CONTEXT *tdb, char *keyval, size_t len)
{
TDB_DATA key, data;
int ret;
key.dptr = keyval;
key.dsize = len;
data = tdb_fetch(tdb, key);
if (!data.dptr || data.dsize != sizeof(int)) return -1;
memcpy(&ret, data.dptr, sizeof(int));
free(data.dptr);
return ret;
}
/* fetch a value by string key, return -1 if not found */
int tdb_fetch_int(TDB_CONTEXT *tdb, char *keystr)
{
return tdb_fetch_int_byblob(tdb, keystr, strlen(keystr) + 1);
}
/* store a value by an arbitary blob key, return 0 on success, -1 on failure */
int tdb_store_int_byblob(TDB_CONTEXT *tdb, char *keystr, size_t len, int v)
{
TDB_DATA key, data;
key.dptr = keystr;
key.dsize = len;
data.dptr = (void *)&v;
data.dsize = sizeof(int);
return tdb_store(tdb, key, data, TDB_REPLACE);
}
/* store a value by string key, return 0 on success, -1 on failure */
int tdb_store_int(TDB_CONTEXT *tdb, char *keystr, int v)
{
return tdb_store_int_byblob(tdb, keystr, strlen(keystr) + 1, v);
}
/* Store a buffer by a null terminated string key. Return 0 on success, -1
on failure */
int tdb_store_by_string(TDB_CONTEXT *tdb, char *keystr, void *buffer, int len)
{
TDB_DATA key, data;
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
data.dptr = buffer;
data.dsize = len;
return tdb_store(tdb, key, data, TDB_REPLACE);
}
/* Fetch a buffer using a null terminated string key. Don't forget to call
free() on the result dptr. */
TDB_DATA tdb_fetch_by_string(TDB_CONTEXT *tdb, char *keystr)
{
TDB_DATA key;
key.dptr = keystr;
key.dsize = strlen(keystr) + 1;
return tdb_fetch(tdb, key);
}
/* useful pair of routines for packing/unpacking data consisting of
integers and strings */
size_t tdb_pack(char *buf, int bufsize, char *fmt, ...)
{
va_list ap;
uint16 w;
uint32 d;
int i;
void *p;
int len=0;
char *s;
char c;
char *buf0 = buf;
char *fmt0 = fmt;
int bufsize0 = bufsize;
va_start(ap, fmt);
while (*fmt) {
switch ((c = *fmt++)) {
case 'w':
len = 2;
w = (uint16)va_arg(ap, int);
if (bufsize >= len) {
SSVAL(buf, 0, w);
}
break;
case 'd':
len = 4;
d = va_arg(ap, uint32);
if (bufsize >= len) {
SIVAL(buf, 0, d);
}
break;
case 'p':
len = 4;
p = va_arg(ap, void *);
d = p?1:0;
if (bufsize >= len) {
SIVAL(buf, 0, d);
}
break;
case 'P':
s = va_arg(ap,char *);
w = strlen(s);
len = w + 1;
if (bufsize >= len) {
memcpy(buf, s, len);
}
break;
case 'f':
s = va_arg(ap,char *);
w = strlen(s);
len = w + 1;
if (bufsize >= len) {
memcpy(buf, s, len);
}
break;
case 'B':
i = va_arg(ap, int);
s = va_arg(ap, char *);
len = 4+i;
if (bufsize >= len) {
SIVAL(buf, 0, i);
memcpy(buf+4, s, i);
}
break;
default:
DEBUG(0,("Unknown tdb_pack format %c in %s\n",
c, fmt));
break;
}
buf += len;
bufsize -= len;
}
va_end(ap);
DEBUG(8,("tdb_pack(%s, %d) -> %d\n",
fmt0, bufsize0, (int)PTR_DIFF(buf, buf0)));
return PTR_DIFF(buf, buf0);
}
/* useful pair of routines for packing/unpacking data consisting of
integers and strings */
int tdb_unpack(char *buf, int bufsize, char *fmt, ...)
{
va_list ap;
uint16 *w;
uint32 *d;
int len=0;
int *i;
void **p;
char *s, **b;
char c;
char *buf0 = buf;
char *fmt0 = fmt;
int bufsize0 = bufsize;
va_start(ap, fmt);
while (*fmt) {
switch ((c=*fmt++)) {
case 'w':
len = 2;
w = va_arg(ap, uint16 *);
if (bufsize < len) goto no_space;
*w = SVAL(buf, 0);
break;
case 'd':
len = 4;
d = va_arg(ap, uint32 *);
if (bufsize < len) goto no_space;
*d = IVAL(buf, 0);
break;
case 'p':
len = 4;
p = va_arg(ap, void **);
if (bufsize < len) goto no_space;
*p = (void *)IVAL(buf, 0);
break;
case 'P':
s = va_arg(ap,char *);
len = strlen(buf) + 1;
if (bufsize < len || len > sizeof(pstring)) goto no_space;
memcpy(s, buf, len);
break;
case 'f':
s = va_arg(ap,char *);
len = strlen(buf) + 1;
if (bufsize < len || len > sizeof(fstring)) goto no_space;
memcpy(s, buf, len);
break;
case 'B':
i = va_arg(ap, int *);
b = va_arg(ap, char **);
len = 4;
if (bufsize < len) goto no_space;
*i = IVAL(buf, 0);
if (! *i) break;
len += *i;
if (bufsize < len) goto no_space;
*b = (char *)malloc(*i);
if (! *b) goto no_space;
memcpy(*b, buf+4, *i);
break;
default:
DEBUG(0,("Unknown tdb_unpack format %c in %s\n",
c, fmt));
break;
}
buf += len;
bufsize -= len;
}
va_end(ap);
DEBUG(8,("tdb_unpack(%s, %d) -> %d\n",
fmt0, bufsize0, (int)PTR_DIFF(buf, buf0)));
return PTR_DIFF(buf, buf0);
no_space:
return -1;
}
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