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extension.c
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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 <assert.h>
#include <sqlite3ext.h>
#include <stdio.h>
#include <string.h>
SQLITE_EXTENSION_INIT1
/*
** 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_extension_init(sqlite3* db,
char** pzErrMsg,
const sqlite3_api_routines* pApi) {
int rc = SQLITE_OK;
SQLITE_EXTENSION_INIT2(pApi);
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;
}