In the CLI, detect and report errors on sqlite3_close(). Clear global

variables prior to exit to so that valgrind can better detect resource
leaks.

FossilOrigin-Name: e3b2e0a078b82ac6cd3c3312e8ac0983c1375e1052f1e324476d2f8d1b227c30

manifest

@@ -1,5 +1,5 @@
-C Improvements\sto\sinteger/float\scomparisons\son\sarchitectures\sthat\slack\sa\n"long\sdouble"\stype.
+C In\sthe\sCLI,\sdetect\sand\sreport\serrors\son\ssqlite3_close().\s\sClear\sglobal\nvariables\sprior\sto\sexit\sto\sso\sthat\svalgrind\scan\sbetter\sdetect\sresource\nleaks.
-D 2018-05-18T14:24:23.139
+D 2018-05-18T17:11:50.887
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in bfc40f350586923e0419d2ea4b559c37ec10ee4b6e210e08c14401f8e340f0da
@@ -494,7 +494,7 @@ F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 6415381a0e9d22c0e7cba33ca4a53f81474190862f5d4838190f5eb5b0b47bc9
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
 F src/select.c a35d462ee7a3c0856ad7a9d9c8921fbf3d91d911a8f39ad9d61302eb43b24a71
-F src/shell.c.in e0f006980883e238555c5ab51bd2dad9fa477c31928419f6d35774288b94853b
+F src/shell.c.in 51c100206f4b7f86cd9affd80b764825e0edc36ca0190c442e4ca7994611bfe2
 F src/sqlite.h.in 34be2d0d18bf4726538793bdc9854cd87f689fda4b3789515134cdbd68188cf4
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 9887b27e69c01e79c2cbe74ef73bf01af5b5703d6a7f0a4371e386d7249cb1c7
@@ -1728,8 +1728,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 33dc8fad7f2b467f259eb78eb7342a760f01d54d95da7fe4cace10e558788a58 3d6625111319c0356c57aaf7b7460fd882c3f00ca668dc43c0abe3403c7c2ba3
+P 5139ea62a8a6c6dc6558c337de39bcbadd26f6515742263387be03c862c78cf0
-R 95f9dad3dedc0c1d42618371aa8f363f
+R b8765ab2a09ad6fd3afc8344422cf1a3
-T +closed 3d6625111319c0356c57aaf7b7460fd882c3f00ca668dc43c0abe3403c7c2ba3
 U drh
-Z 5a624356c837c7a872fedd9425b35399
+Z d089a713f2ba352bce4662bcdd3c7d90

manifest.uuid

@@ -1 +1 @@
-5139ea62a8a6c6dc6558c337de39bcbadd26f6515742263387be03c862c78cf0
+e3b2e0a078b82ac6cd3c3312e8ac0983c1375e1052f1e324476d2f8d1b227c30

src/shell.c.in

@@ -3656,6 +3656,17 @@ static void open_db(ShellState *p, int openFlags){
   }
 }
 
+/*
+** Attempt to close the databaes connection.  Report errors.
+*/
+void close_db(sqlite3 *db){
+  int rc = sqlite3_close(db);
+  if( rc ){
+    utf8_printf(stderr, "Error: sqlite3_close() returns %d: %s\n",
+        rc, sqlite3_errmsg(db));
+  } 
+}
+
 #if HAVE_READLINE || HAVE_EDITLINE
 /*
 ** Readline completion callbacks
@@ -4236,7 +4247,7 @@ static void tryToClone(ShellState *p, const char *zNewDb){
     sqlite3_exec(newDb, "COMMIT;", 0, 0, 0);
     sqlite3_exec(p->db, "PRAGMA writable_schema=OFF;", 0, 0, 0);
   }
-  sqlite3_close(newDb);
+  close_db(newDb);
 }
 
 /*
@@ -5553,7 +5564,7 @@ static int arDotCommand(
   }
 end_ar_command:
   if( cmd.db!=pState->db ){
-    sqlite3_close(cmd.db);
+    close_db(cmd.db);
   }
   sqlite3_free(cmd.zSrcTable);
 
@@ -5676,14 +5687,14 @@ static int do_meta_command(char *zLine, ShellState *p){
                   SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE, zVfs);
     if( rc!=SQLITE_OK ){
       utf8_printf(stderr, "Error: cannot open \"%s\"\n", zDestFile);
-      sqlite3_close(pDest);
+      close_db(pDest);
       return 1;
     }
     open_db(p, 0);
     pBackup = sqlite3_backup_init(pDest, "main", p->db, zDb);
     if( pBackup==0 ){
       utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(pDest));
-      sqlite3_close(pDest);
+      close_db(pDest);
       return 1;
     }
     while(  (rc = sqlite3_backup_step(pBackup,100))==SQLITE_OK ){}
@@ -5694,7 +5705,7 @@ static int do_meta_command(char *zLine, ShellState *p){
       utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(pDest));
       rc = 1;
     }
-    sqlite3_close(pDest);
+    close_db(pDest);
   }else
 
   if( c=='b' && n>=3 && strncmp(azArg[0], "bail", n)==0 ){
@@ -6510,7 +6521,7 @@ static int do_meta_command(char *zLine, ShellState *p){
     int newFlag = 0;     /* True to delete file before opening */
     /* Close the existing database */
     session_close_all(p);
-    sqlite3_close(p->db);
+    close_db(p->db);
     p->db = 0;
     p->zDbFilename = 0;
     sqlite3_free(p->zFreeOnClose);
@@ -6690,14 +6701,14 @@ static int do_meta_command(char *zLine, ShellState *p){
     rc = sqlite3_open(zSrcFile, &pSrc);
     if( rc!=SQLITE_OK ){
       utf8_printf(stderr, "Error: cannot open \"%s\"\n", zSrcFile);
-      sqlite3_close(pSrc);
+      close_db(pSrc);
       return 1;
     }
     open_db(p, 0);
     pBackup = sqlite3_backup_init(p->db, zDb, pSrc, "main");
     if( pBackup==0 ){
       utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
-      sqlite3_close(pSrc);
+      close_db(pSrc);
       return 1;
     }
     while( (rc = sqlite3_backup_step(pBackup,100))==SQLITE_OK
@@ -6717,7 +6728,7 @@ static int do_meta_command(char *zLine, ShellState *p){
       utf8_printf(stderr, "Error: %s\n", sqlite3_errmsg(p->db));
       rc = 1;
     }
-    sqlite3_close(pSrc);
+    close_db(pSrc);
   }else
 
   if( c=='s' && strncmp(azArg[0], "scanstats", n)==0 ){
@@ -7401,7 +7412,10 @@ static int do_meta_command(char *zLine, ShellState *p){
     initText(&s);
     open_db(p, 0);
     rc = sqlite3_prepare_v2(p->db, "PRAGMA database_list", -1, &pStmt, 0);
-    if( rc ) return shellDatabaseError(p->db);
+    if( rc ){
+      sqlite3_finalize(pStmt);
+      return shellDatabaseError(p->db);
+    }
 
     if( nArg>2 && c=='i' ){
       /* It is an historical accident that the .indexes command shows an error
@@ -7409,6 +7423,7 @@ static int do_meta_command(char *zLine, ShellState *p){
       ** command does not. */
       raw_printf(stderr, "Usage: .indexes ?LIKE-PATTERN?\n");
       rc = 1;
+      sqlite3_finalize(pStmt);
       goto meta_command_exit;
     }
     for(ii=0; sqlite3_step(pStmt)==SQLITE_ROW; ii++){
@@ -8754,7 +8769,7 @@ int SQLITE_CDECL wmain(int argc, wchar_t **wargv){
   set_table_name(&data, 0);
   if( data.db ){
     session_close_all(&data);
-    sqlite3_close(data.db);
+    close_db(data.db);
   }
   sqlite3_free(data.zFreeOnClose);
   find_home_dir(1);
@@ -8765,5 +8780,8 @@ int SQLITE_CDECL wmain(int argc, wchar_t **wargv){
   for(i=0; i<argcToFree; i++) free(argvToFree[i]);
   free(argvToFree);
 #endif
+  /* Clear the global data structure so that valgrind will detect memory
+  ** leaks */
+  memset(&data, 0, sizeof(data));
   return rc;
 }