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/* An "echo" database for GNU Dico test suite.
Copyright (C) 2012-2024 Sergey Poznyakoff
GNU Dico 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.
GNU Dico 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 GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <dico.h>
#include <string.h>
/* This module either returns query strings without any changes (echo mode),
or denies any queries (null mode). */
enum echo_mode {
ECHO_ECHO, /* Operate in echo mode */
ECHO_NULL /* Operate in null mode */
};
struct dico_handle_struct {
enum echo_mode mode;
char *prefix;
size_t prefix_len;
};
static int
echo_init(int argc, char **argv)
{
return 0;
}
static dico_handle_t
echo_init_db(const char *dbname, int argc, char **argv)
{
int null_mode = 0;
dico_handle_t hp;
char *prefix = NULL;
struct dico_option init_db_option[] = {
{ DICO_OPTSTR(null), dico_opt_bool, &null_mode },
{ DICO_OPTSTR(prefix), dico_opt_string, &prefix },
{ NULL }
};
if (dico_parseopt(init_db_option, argc, argv, 0, NULL))
return NULL;
hp = malloc(sizeof(*hp));
if (hp) {
hp->mode = null_mode ? ECHO_NULL : ECHO_ECHO;
if (prefix) {
hp->prefix = strdup(prefix);
if (!hp->prefix) {
dico_log(L_ERR, 0, "not enough memory");
free(hp);
return NULL;
}
hp->prefix_len = strlen(prefix);
} else {
hp->prefix = NULL;
hp->prefix_len = 0;
}
} else
dico_log(L_ERR, 0, "not enough memory");
return hp;
}
static int
echo_free_db(dico_handle_t hp)
{
free(hp);
return 0;
}
static int
echo_open(dico_handle_t dp)
{
return 0;
}
static int
echo_close(dico_handle_t hp)
{
return 0;
}
static char *
echo_info(dico_handle_t ep)
{
static char *echo_info_str[2] = {
"\
ECHO database.\n\n\
This database echoes each query.\n",
"\
NULL database.\n\n\
This database returns NULL (no result) to any match and define\n\
requests.\n"
};
return strdup(echo_info_str[ep->mode]);
}
static char *
echo_descr(dico_handle_t ep)
{
static char *echo_descr_str[2] = {
"GNU Dico ECHO database",
"GNU Dico NULL database"
};
char *res;
if (ep->mode == ECHO_ECHO && ep->prefix) {
size_t len = strlen(echo_descr_str[ep->mode]) + ep->prefix_len + 11;
res = malloc(len);
if (res)
snprintf(res, len, "%s (prefix %s)",
echo_descr_str[ep->mode], ep->prefix);
} else
res = strdup(echo_descr_str[ep->mode]);
return res;
}
static dico_result_t
new_result(dico_handle_t ep, char const *word)
{
char *res = malloc(strlen(word) + ep->prefix_len + 1);
if (!res)
dico_log(L_ERR, 0, "not enough memory");
else {
if (ep->prefix)
memcpy(res, ep->prefix, ep->prefix_len);
strcpy(res + ep->prefix_len, word);
}
return (dico_result_t) res;
}
static dico_result_t
echo_match(dico_handle_t ep, const dico_strategy_t strat, const char *word)
{
if (ep->mode == ECHO_NULL)
return NULL;
return new_result(ep, word);
}
static dico_result_t
echo_define(dico_handle_t ep, const char *word)
{
if (ep->mode == ECHO_NULL)
return NULL;
return new_result(ep, word);
}
static int
echo_output_result(dico_result_t rp, size_t n, dico_stream_t str)
{
char *word = (char*)rp;
dico_stream_write(str, word, strlen(word));
return 0;
}
static size_t
echo_result_count(dico_result_t rp)
{
return 1;
}
static size_t
echo_compare_count(dico_result_t rp)
{
return 1;
}
static void
echo_free_result(dico_result_t rp)
{
free(rp);
}
static char *
echo_mime_header(dico_handle_t ep)
{
return strdup("Content-Type: text/plain; charset=utf-8\n\
Content-Transfer-Encoding: 8bit\n");
}
struct dico_database_module DICO_EXPORT(echo, module) = {
.dico_version = DICO_MODULE_VERSION,
.dico_capabilities = DICO_CAPA_NONE,
.dico_init = echo_init,
.dico_init_db = echo_init_db,
.dico_free_db = echo_free_db,
.dico_open = echo_open,
.dico_close = echo_close,
.dico_db_info = echo_info,
.dico_db_descr = echo_descr,
.dico_match = echo_match,
.dico_define = echo_define,
.dico_output_result = echo_output_result,
.dico_result_count = echo_result_count,
.dico_compare_count = echo_compare_count,
.dico_free_result = echo_free_result,
.dico_db_mime_header = echo_mime_header
};
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