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59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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** 2017-04-16
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This file implements a run-time loadable extension to SQLite that
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** registers a sqlite3_collation_needed() callback to register a fake
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** collating function for any unknown collating sequence. The fake
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** collating function works like BINARY.
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**
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** This extension can be used to load schemas that contain one or more
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** unknown collating sequences.
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*/
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#include "sqlite3ext.h"
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SQLITE_EXTENSION_INIT1
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#include <string.h>
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static int anyCollFunc(
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void *NotUsed,
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int nKey1, const void *pKey1,
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int nKey2, const void *pKey2
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){
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int rc, n;
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n = nKey1<nKey2 ? nKey1 : nKey2;
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rc = memcmp(pKey1, pKey2, n);
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if( rc==0 ) rc = nKey1 - nKey2;
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return rc;
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}
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static void anyCollNeeded(
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void *NotUsed,
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sqlite3 *db,
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int eTextRep,
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const char *zCollName
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){
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sqlite3_create_collation(db, zCollName, eTextRep, 0, anyCollFunc);
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}
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#ifdef _WIN32
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__declspec(dllexport)
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#endif
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int sqlite3_anycollseq_init(
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sqlite3 *db,
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char **pzErrMsg,
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const sqlite3_api_routines *pApi
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){
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int rc = SQLITE_OK;
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SQLITE_EXTENSION_INIT2(pApi);
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rc = sqlite3_collation_needed(db, 0, anyCollNeeded);
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return rc;
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}
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