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/*
** 2020-01-08
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
******************************************************************************
**
** This SQLite extension implements a noop() function used for testing.
**
** Variants:
**
** noop(X) The default. Deterministic.
** noop_i(X) Deterministic and innocuous.
** noop_do(X) Deterministic and direct-only.
** noop_nd(X) Non-deterministic.
*/
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1
#include <assert.h>
#include <string.h>
/*
** Implementation of the noop() function.
**
** The function returns its argument, unchanged.
*/
static void noopfunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
assert( argc==1 );
sqlite3_result_value(context, argv[0]);
}
/*
** Implementation of the multitype_text() function.
**
** The function returns its argument. The result will always have a
** TEXT value. But if the original input is numeric, it will also
** have that numeric value.
*/
static void multitypeTextFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
assert( argc==1 );
(void)argc;
(void)sqlite3_value_text(argv[0]);
sqlite3_result_value(context, argv[0]);
}
#ifdef _WIN32
__declspec(dllexport)
#endif
int sqlite3_noop_init(
sqlite3 *db,
char **pzErrMsg,
const sqlite3_api_routines *pApi
){
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
(void)pzErrMsg; /* Unused parameter */
rc = sqlite3_create_function(db, "noop", 1,
SQLITE_UTF8 | SQLITE_DETERMINISTIC,
0, noopfunc, 0, 0);
if( rc ) return rc;
rc = sqlite3_create_function(db, "noop_i", 1,
SQLITE_UTF8 | SQLITE_DETERMINISTIC | SQLITE_INNOCUOUS,
0, noopfunc, 0, 0);
if( rc ) return rc;
rc = sqlite3_create_function(db, "noop_do", 1,
SQLITE_UTF8 | SQLITE_DETERMINISTIC | SQLITE_DIRECTONLY,
0, noopfunc, 0, 0);
if( rc ) return rc;
rc = sqlite3_create_function(db, "noop_nd", 1,
SQLITE_UTF8,
0, noopfunc, 0, 0);
if( rc ) return rc;
rc = sqlite3_create_function(db, "multitype_text", 1,
SQLITE_UTF8,
0, multitypeTextFunc, 0, 0);
return rc;
}
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