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/*
ldb database library
Copyright (C) Andrew Tridgell 2004
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb utf8 handling
*
* Description: case folding and case comparison for UTF8 strings
*
* Author: Andrew Tridgell
*/
#include "includes.h"
#include "ldb/include/ldb.h"
#include "ldb/include/ldb_private.h"
#include <ctype.h>
/*
TODO:
a simple case folding function - will be replaced by a UTF8 aware function later
*/
char *ldb_casefold(void *mem_ctx, const char *s)
{
int i;
char *ret = talloc_strdup(mem_ctx, s);
if (!s) {
errno = ENOMEM;
return NULL;
}
for (i=0;ret[i];i++) {
ret[i] = toupper(ret[i]);
}
return ret;
}
/*
a caseless compare, optimised for 7 bit
TODO: doesn't yet handle UTF8
*/
static int ldb_caseless_cmp(const char *s1, const char *s2)
{
int i;
for (i=0;s1[i] != 0;i++) {
int c1 = toupper(s1[i]), c2 = toupper(s2[i]);
if (c1 != c2) {
return c1 - c2;
}
}
return s2[i];
}
/*
compare two basedn fields
return 0 for match
*/
int ldb_dn_cmp(const char *dn1, const char *dn2)
{
return ldb_caseless_cmp(dn1, dn2);
}
/*
compare two attributes
return 0 for match
*/
int ldb_attr_cmp(const char *dn1, const char *dn2)
{
return ldb_caseless_cmp(dn1, dn2);
}
/*
casefold a dn. We need to uppercase the attribute names, and the
attribute values of case insensitive attributes. We also need to remove
extraneous spaces between elements
*/
char *ldb_dn_fold(void * mem_ctx,
const char * dn,
void * user_data,
int (* case_fold_attr_fn)(void * user_data, char * attr))
{
const char *dn_orig = dn;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
char *ret;
size_t len;
ret = talloc_strdup(tmp_ctx, "");
if (ret == NULL) goto failed;
while ((len = strcspn(dn, ",")) > 0) {
char *p = strchr(dn, '=');
char *attr, *value;
int case_fold_required;
if (p == NULL || (p-dn) > len) goto failed;
attr = talloc_strndup(tmp_ctx, dn, p-dn);
if (attr == NULL) goto failed;
/* trim spaces from the attribute name */
while (' ' == *attr) attr++;
while (' ' == attr[strlen(attr)-1]) {
attr[strlen(attr)-1] = 0;
}
if (*attr == 0) goto failed;
value = talloc_strndup(tmp_ctx, p+1, len-(p+1-dn));
if (value == NULL) goto failed;
/* trim spaces from the value */
while (' ' == *value) value++;
while (' ' == value[strlen(value)-1]) {
value[strlen(value)-1] = 0;
}
if (*value == 0) goto failed;
case_fold_required = case_fold_attr_fn(user_data, attr);
attr = ldb_casefold(tmp_ctx, attr);
if (attr == NULL) goto failed;
talloc_steal(tmp_ctx, attr);
if (case_fold_required) {
value = ldb_casefold(tmp_ctx, value);
if (value == NULL) goto failed;
talloc_steal(tmp_ctx, value);
}
if (dn[len] == ',') {
ret = talloc_asprintf_append(ret, "%s=%s,", attr, value);
} else {
ret = talloc_asprintf_append(ret, "%s=%s", attr, value);
}
if (ret == NULL) goto failed;
dn += len;
if (*dn == ',') dn++;
}
talloc_steal(mem_ctx, ret);
talloc_free(tmp_ctx);
return ret;
failed:
talloc_free(tmp_ctx);
return ldb_casefold(mem_ctx, dn_orig);
}
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