1 /*
2 ** 2020-01-08
3 **
4 ** The author disclaims copyright to this source code. In place of
5 ** a legal notice, here is a blessing:
6 **
7 ** May you do good and not evil.
8 ** May you find forgiveness for yourself and forgive others.
9 ** May you share freely, never taking more than you give.
10 **
11 ******************************************************************************
12 **
13 ** This SQLite extension implements a noop() function used for testing.
14 **
15 ** Variants:
16 **
17 ** noop(X) The default. Deterministic.
18 ** noop_i(X) Deterministic and innocuous.
19 ** noop_do(X) Deterministic and direct-only.
20 ** noop_nd(X) Non-deterministic.
21 */
22 #include "sqlite3ext.h"
23 SQLITE_EXTENSION_INIT1
24 #include <assert.h>
25 #include <string.h>
26
27 /*
28 ** Implementation of the noop() function.
29 **
30 ** The function returns its argument, unchanged.
31 */
noopfunc(sqlite3_context * context,int argc,sqlite3_value ** argv)32 static void noopfunc(
33 sqlite3_context *context,
34 int argc,
35 sqlite3_value **argv
36 ){
37 assert( argc==1 );
38 sqlite3_result_value(context, argv[0]);
39 }
40
41 #ifdef _WIN32
42 __declspec(dllexport)
43 #endif
sqlite3_noop_init(sqlite3 * db,char ** pzErrMsg,const sqlite3_api_routines * pApi)44 int sqlite3_noop_init(
45 sqlite3 *db,
46 char **pzErrMsg,
47 const sqlite3_api_routines *pApi
48 ){
49 int rc = SQLITE_OK;
50 SQLITE_EXTENSION_INIT2(pApi);
51 (void)pzErrMsg; /* Unused parameter */
52 rc = sqlite3_create_function(db, "noop", 1,
53 SQLITE_UTF8 | SQLITE_DETERMINISTIC,
54 0, noopfunc, 0, 0);
55 if( rc ) return rc;
56 rc = sqlite3_create_function(db, "noop_i", 1,
57 SQLITE_UTF8 | SQLITE_DETERMINISTIC | SQLITE_INNOCUOUS,
58 0, noopfunc, 0, 0);
59 if( rc ) return rc;
60 rc = sqlite3_create_function(db, "noop_do", 1,
61 SQLITE_UTF8 | SQLITE_DETERMINISTIC | SQLITE_DIRECTONLY,
62 0, noopfunc, 0, 0);
63 if( rc ) return rc;
64 rc = sqlite3_create_function(db, "noop_nd", 1,
65 SQLITE_UTF8,
66 0, noopfunc, 0, 0);
67 return rc;
68 }
69