Robert Shearman : msi: An empty string is equivalent to nil, so handle this in the optimised WHERE_execute path.

[Alexandre Julliard]

Module: wine
Branch: refs/heads/master
Commit: d70db020a6d961b8266fbd780e42409064e4e6e0
URL:    http://source.winehq.org/git/?p=wine.git;a=commit;h=d70db020a6d961b8266fbd780e42409064e4e6e0

Author: Robert Shearman <rob at codeweavers.com>
Date:   Mon Jun  5 01:41:04 2006 +0100

msi: An empty string is equivalent to nil, so handle this in the optimised WHERE_execute path.

---

 dlls/msi/where.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/dlls/msi/where.c b/dlls/msi/where.c
index 6fa70a3..a02b19b 100644
--- a/dlls/msi/where.c
+++ b/dlls/msi/where.c
@@ -265,11 +265,17 @@ static UINT WHERE_execute( struct tagMSI
         if ((col_cond->type == EXPR_COL_NUMBER_STRING) && (val_cond->type == EXPR_SVAL))
         {
             col = col_cond->u.col_number;
-            r = msi_string2idW(wv->db->strings, val_cond->u.sval, &value);
-            if (r != ERROR_SUCCESS)
+            /* special case for "" - translate it into nil */
+            if (!val_cond->u.sval[0])
+                value = 0;
+            else
             {
-                TRACE("no id for %s, assuming it doesn't exist in the table\n", debugstr_w(wv->cond->u.expr.right->u.sval));
-                return ERROR_SUCCESS;
+                r = msi_string2idW(wv->db->strings, val_cond->u.sval, &value);
+                if (r != ERROR_SUCCESS)
+                {
+                    TRACE("no id for %s, assuming it doesn't exist in the table\n", debugstr_w(wv->cond->u.expr.right->u.sval));
+                    return ERROR_SUCCESS;
+                }
             }
 
             do