[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/src/expr.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 560 matching lines @@
     }
     if( i>pParse->nVar ){
       pParse->nVar = (int)i;
     }
   }else{
     /* Wildcards like ":aaa", "$aaa" or "@aaa".  Reuse the same variable
     ** number as the prior appearance of the same name, or if the name
     ** has never appeared before, reuse the same variable number
     */
     int i;
+    u32 n;
+    n = sqlite3Strlen30(z);
     for(i=0; i<pParse->nVarExpr; i++){
       Expr *pE = pParse->apVarExpr[i];
       assert( pE!=0 );
-      if( strcmp(pE->u.zToken, z)==0 ){
+      if( memcmp(pE->u.zToken, z, n)==0 && pE->u.zToken[n]==0 ){
         pExpr->iColumn = pE->iColumn;
         break;
       }
     }
     if( i>=pParse->nVarExpr ){
       pExpr->iColumn = (ynVar)(++pParse->nVar);
       if( pParse->nVarExpr>=pParse->nVarExprAlloc-1 ){
         pParse->nVarExprAlloc += pParse->nVarExprAlloc + 10;
         pParse->apVarExpr =
             sqlite3DbReallocOrFree(
@@ skipping 177 matching lines @@
         nToken = sqlite3Strlen30(p->u.zToken) + 1;
       }else{
         nToken = 0;
       }
       if( isReduced ){
         assert( ExprHasProperty(p, EP_Reduced)==0 );
         memcpy(zAlloc, p, nNewSize);
       }else{
         int nSize = exprStructSize(p);
         memcpy(zAlloc, p, nSize);
-        if( EXPR_FULLSIZE>nSize ){
-          memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
-        }
+        memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
       }
 
       /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */
       pNew->flags &= ~(EP_Reduced|EP_TokenOnly|EP_Static);
       pNew->flags |= nStructSize & (EP_Reduced|EP_TokenOnly);
       pNew->flags |= staticFlag;
 
       /* Copy the p->u.zToken string, if any. */
       if( nToken ){
         char *zToken = pNew->u.zToken = (char*)&zAlloc[nNewSize];
@@ skipping 2951 matching lines @@
   }
   return i;
 }
 void sqlite3ReleaseTempRange(Parse *pParse, int iReg, int nReg){
   sqlite3ExprCacheRemove(pParse, iReg, nReg);
   if( nReg>pParse->nRangeReg ){
     pParse->nRangeReg = nReg;
     pParse->iRangeReg = iReg;
   }
 }