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/* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
Copyright(C) 2013 Kouhei Sutou <kou@clear-code.com>
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 2.1 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <mrn_mysql.h>
#include <mrn_mysql_compat.h>
#include <mrn_path_mapper.hpp>
#include <mrn_windows.hpp>
#include <mrn_macro.hpp>
MRN_BEGIN_DECLS
struct EscapeInfo
{
grn_ctx ctx;
grn_obj target_characters;
grn_obj escaped_query;
bool processed;
};
MRN_API my_bool mroonga_escape_init(UDF_INIT *initid, UDF_ARGS *args,
char *message)
{
EscapeInfo *info = NULL;
initid->ptr = NULL;
if (!(1 <= args->arg_count && args->arg_count <= 2)) {
sprintf(message,
"mroonga_escape(): Incorrect number of arguments: %u for 1..2",
args->arg_count);
goto error;
}
if (args->arg_type[0] != STRING_RESULT) {
strcpy(message,
"mroonga_escape(): The 1st argument must be query as string");
goto error;
}
if (args->arg_count == 2) {
if (args->arg_type[1] != STRING_RESULT) {
strcpy(message,
"mroonga_escape(): "
"The 2st argument must be escape target characters as string");
goto error;
}
}
initid->maybe_null = 1;
initid->const_item = 1;
info = (EscapeInfo *)my_malloc(sizeof(EscapeInfo),
MYF(MY_WME | MY_ZEROFILL));
if (!info) {
strcpy(message, "mroonga_escape(): out of memory");
goto error;
}
grn_ctx_init(&(info->ctx), 0);
GRN_TEXT_INIT(&(info->target_characters), 0);
GRN_TEXT_INIT(&(info->escaped_query), 0);
info->processed = false;
initid->ptr = (char *)info;
return FALSE;
error:
if (info) {
grn_ctx_fin(&(info->ctx));
my_free(info, MYF(0));
}
return TRUE;
}
static void escape(EscapeInfo *info, UDF_ARGS *args)
{
grn_ctx *ctx = &(info->ctx);
char *query = args->args[0];
unsigned int query_length = args->lengths[0];
if (args->arg_count == 2) {
char *target_characters = args->args[1];
unsigned int target_characters_length = args->lengths[1];
GRN_TEXT_PUT(ctx, &(info->target_characters),
target_characters,
target_characters_length);
GRN_TEXT_PUTC(ctx, &(info->target_characters), '\0');
grn_expr_syntax_escape(ctx, query, query_length,
GRN_TEXT_VALUE(&(info->target_characters)),
GRN_QUERY_ESCAPE,
&(info->escaped_query));
} else {
grn_expr_syntax_escape_query(ctx, query, query_length,
&(info->escaped_query));
}
}
MRN_API char *mroonga_escape(UDF_INIT *initid, UDF_ARGS *args, char *result,
unsigned long *length, char *is_null, char *error)
{
EscapeInfo *info = (EscapeInfo *)initid->ptr;
grn_ctx *ctx = &(info->ctx);
if (!args->args[0]) {
*is_null = 1;
return NULL;
}
*is_null = 0;
if (!info->processed) {
escape(info, args);
info->processed = true;
}
if (ctx->rc) {
my_message(ER_ERROR_ON_WRITE, ctx->errbuf, MYF(0));
goto error;
}
*length = GRN_TEXT_LEN(&(info->escaped_query));
return (char *)(GRN_TEXT_VALUE(&(info->escaped_query)));
error:
*error = 1;
return NULL;
}
MRN_API void mroonga_escape_deinit(UDF_INIT *initid)
{
EscapeInfo *info = (EscapeInfo *)initid->ptr;
if (info) {
grn_obj_unlink(&(info->ctx), &(info->target_characters));
grn_obj_unlink(&(info->ctx), &(info->escaped_query));
grn_ctx_fin(&(info->ctx));
my_free(info, MYF(0));
}
}
MRN_END_DECLS
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