[sql] Import reference version of SQLite 3.10.2.

third_party/sqlite/sqlite-src-3100200/src/random.c

 /*
 ** 2001 September 15
 **
 ** 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.
 **
@@ skipping 30 matching lines @@
   ** to the "sqlite3Prng" state vector declared above.
   */
 #ifdef SQLITE_OMIT_WSD
   struct sqlite3PrngType *p = &GLOBAL(struct sqlite3PrngType, sqlite3Prng);
 # define wsdPrng p[0]
 #else
 # define wsdPrng sqlite3Prng
 #endif
 
 #if SQLITE_THREADSAFE
-  sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
-  sqlite3_mutex_enter(mutex);
+  sqlite3_mutex *mutex;
 #endif
 
-  if( N<=0 ){
+#ifndef SQLITE_OMIT_AUTOINIT
+  if( sqlite3_initialize() ) return;
+#endif
+
+#if SQLITE_THREADSAFE
+  mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_PRNG);
+#endif
+
+  sqlite3_mutex_enter(mutex);
+  if( N<=0 || pBuf==0 ){
     wsdPrng.isInit = 0;
     sqlite3_mutex_leave(mutex);
     return;
   }
 
   /* Initialize the state of the random number generator once,
   ** the first time this routine is called.  The seed value does
   ** not need to contain a lot of randomness since we are not
   ** trying to do secure encryption or anything like that...
   **
@@ skipping 51 matching lines @@
   );
 }
 void sqlite3PrngRestoreState(void){
   memcpy(
     &GLOBAL(struct sqlite3PrngType, sqlite3Prng),
     &GLOBAL(struct sqlite3PrngType, sqlite3SavedPrng),
     sizeof(sqlite3Prng)
   );
 }
 #endif /* SQLITE_OMIT_BUILTIN_TEST */