Databases created using sqlite3_deserialize() should report their filename

as an empty string, not as "x".  Fix for ticket [53043c9793715f08].

FossilOrigin-Name: ff494449efd475878c549728cc22ee9b12d13674068781747fc042a0c1bd09c8

manifest

@@ -1,5 +1,5 @@
-C Update\sthe\sversion\snumber\sto\s3.41.0\sto\sbegin\sthe\snext\sdevelopment\scycle.
-D 2022-11-18T17:57:19.737
+C Databases\screated\susing\ssqlite3_deserialize()\sshould\sreport\stheir\sfilename\nas\san\sempty\sstring,\snot\sas\s"x".\s\sFix\sfor\sticket\s[53043c9793715f08].
+D 2022-11-19T00:08:35.872
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -607,7 +607,7 @@ F src/mem1.c c12a42539b1ba105e3707d0e628ad70e611040d8f5e38cf942cee30c867083de
 F src/mem2.c c8bfc9446fd0798bddd495eb5d9dbafa7d4b7287d8c22d50a83ac9daa26d8a75
 F src/mem3.c 30301196cace2a085cbedee1326a49f4b26deff0af68774ca82c1f7c06fda4f6
 F src/mem5.c 5a3dbd8ac8a6501152a4fc1fcae9b0900c2d7eb0589c4ec7456fdde15725a26c
-F src/memdb.c c2dc88f97c410eb68a24468344b65526685e18354ddfd15906750c1eaf9dc2dd
+F src/memdb.c a42248bc04dc1f80da3511618a78956ed77b65058b73e251bde39061204e9f97
 F src/memjournal.c c283c6c95d940eb9dc70f1863eef3ee40382dbd35e5a1108026e7817c206e8a0
 F src/msvc.h 3a15918220367a8876be3fa4f2abe423a861491e84b864fb2b7426bf022a28f8
 F src/mutex.c 5e3409715552348732e97b9194abe92fdfcd934cfb681df4ba0ab87ac6c18d25
@@ -624,7 +624,7 @@ F src/os_setup.h 6011ad7af5db4e05155f385eb3a9b4470688de6f65d6166b8956e58a3d87210
 F src/os_unix.c 287aa5f5691a2b356780c63e83abaa33549add84227b8313395f04088486d79c
 F src/os_win.c 295fe45f18bd86f2477f4cd79f3377c6f883ceb941b1f46808665c73747f2345
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
-F src/pager.c 6176d9752eb580419e8fef4592dc417a6b00ddfd43ee22f818819bf8840ceee8
+F src/pager.c d3122cf67f327f1e2df12d06236a3473a8099542071e257067552f42917f172d
 F src/pager.h f82e9844166e1585f5786837ddc7709966138ced17f568c16af7ccf946c2baa3
 F src/parse.y 8e67d820030d2655b9942ffe61c1e7e6b96cea2f2f72183533299393907d0564
 F src/pcache.c f4268f7f73c6a3db12ce22fd25bc68dc42315d19599414ab1207d7cf32f79197
@@ -642,7 +642,7 @@ F src/shell.c.in 16740a86346ba9823f92528ec588f2b74f68166dac965dabd19883ace230f11
 F src/sqlite.h.in 100fc660c2f19961b8ed8437b9d53d687de2f8eb2b96437ec6da216adcb643ca
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h c4b9fa7a7e2bcdf850cfeb4b8a91d5ec47b7a00033bc996fd2ee96cbf2741f5f
-F src/sqliteInt.h 2c24ba38f78e32fe5d7ec136321a6ad827698b33ca98664970a8b7274d69ef7c
+F src/sqliteInt.h 1a2cec0f7682da69975eb203fef2058949051ff500445b997d8047cbd8813315
 F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
 F src/status.c 160c445d7d28c984a0eae38c144f6419311ed3eace59b44ac6dafc20db4af749
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
@@ -2055,8 +2055,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 17065d095d26a814acf1e13f5cc18b21fecc58eb8c9da100458029bb139fcd35
-R 22a528d37f506919a8fa02d3dfd9adb1
+P 5c669f5f399fe89998b9edba6486f2a6fe5fca789ed82e8711349c8736b293d9
+R 06e897a36d76f0b40d32a92b9dcc8859
 U drh
-Z fb95072ca0b99e5cdd6cbf0ffc52d763
+Z 7c255a26bf6fe056b55fba3394c16cef
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-5c669f5f399fe89998b9edba6486f2a6fe5fca789ed82e8711349c8736b293d9
+ff494449efd475878c549728cc22ee9b12d13674068781747fc042a0c1bd09c8

src/memdb.c

@@ -857,6 +857,13 @@ end_deserialize:
   return rc;
 }
 
+/*
+** Return true if the VFS is the memvfs.
+*/
+int sqlite3IsMemdb(const sqlite3_vfs *pVfs){
+  return pVfs==&memdb_vfs;
+}
+
 /* 
 ** This routine is called when the extension is loaded.
 ** Register the new VFS.

src/pager.c

@@ -7009,7 +7009,11 @@ int sqlite3PagerSavepoint(Pager *pPager, int op, int iSavepoint){
 */
 const char *sqlite3PagerFilename(const Pager *pPager, int nullIfMemDb){
   static const char zFake[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
-  return (nullIfMemDb && pPager->memDb) ? &zFake[4] : pPager->zFilename;
+  if( nullIfMemDb && (pPager->memDb || sqlite3IsMemdb(pPager->pVfs)) ){
+    return &zFake[4];
+  }else{
+    return pPager->zFilename;
+  }
 }
 
 /*

src/sqliteInt.h

@@ -5003,6 +5003,9 @@ const char *sqlite3ErrName(int);
 
 #ifndef SQLITE_OMIT_DESERIALIZE
 int sqlite3MemdbInit(void);
+int sqlite3IsMemdb(const sqlite3_vfs*);
+#else
+# define sqlite3IsMemdb(X) 0
 #endif
 
 const char *sqlite3ErrStr(int);