Improvements to fuzzershell: Avoid excess memory allocations when loading

many files.  Show the total runtime on final output.  Show individual filenames
as they are processed even if they are single test-case files.

FossilOrigin-Name: 34a722a2f3331c35211526c9ec055d4d9175c965

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\s".limit"\scommand\sto\sthe\scommand-line\sshell.
-D 2015-05-02T17:40:23.555
+C Improvements\sto\sfuzzershell:\sAvoid\sexcess\smemory\sallocations\swhen\sloading\nmany\sfiles.\s\sShow\sthe\stotal\sruntime\son\sfinal\soutput.\s\sShow\sindividual\sfilenames\nas\sthey\sare\sprocessed\seven\sif\sthey\sare\ssingle\stest-case\sfiles.
+D 2015-05-02T19:54:35.010
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in e628c50e237251fc7e768bef14ee7e822ad69e69
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -1208,7 +1208,7 @@ F tool/diffdb.c 7524b1b5df217c20cd0431f6789851a4e0cb191b
 F tool/extract.c 054069d81b095fbdc189a6f5d4466e40380505e2
 F tool/fast_vacuum.c 5ba0d6f5963a0a63bdc42840f678bad75b2ebce1
 F tool/fragck.tcl 5265a95126abcf6ab357f7efa544787e5963f439
-F tool/fuzzershell.c beafb3f10b02fedab02d364054290d93cfa42c8e
+F tool/fuzzershell.c e8be9a8bd8e0e7814592c5e3e38de99ad7beee83
 F tool/genfkey.README cf68fddd4643bbe3ff8e31b8b6d8b0a1b85e20f4
 F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
 F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
@@ -1256,7 +1256,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 78c7ec95931265b89a92f6a799fc9b1a9f0476bf
-R b4e016ae5f2b9a1c3d3b22b5f2592000
+P 803cb60e75e0b09a526eefec11139cb3e8ae8c7c
+R a10ebc5ebd493f767d287662e8eaf180
 U drh
-Z d46a3572f454bea0b6b400466ab43088
+Z 6cb1cc7bdaf6b986d5c102ca2fc3f2f8

manifest.uuid

@@ -1 +1 @@
-803cb60e75e0b09a526eefec11139cb3e8ae8c7c
+34a722a2f3331c35211526c9ec055d4d9175c965

tool/fuzzershell.c

@@ -451,9 +451,10 @@ int main(int argc, char **argv){
   int nInFile = 0;              /* Number of input files to read */
   char **azInFile = 0;          /* Array of input file names */
   int jj;                       /* Loop counter for azInFile[] */
+  sqlite3_int64 iBegin;         /* Start time for the whole program */
   sqlite3_int64 iStart, iEnd;   /* Start and end-times for a test case */
 
-
+  iBegin = timeOfDay();
   zFailCode = getenv("TEST_FAILURE");
   g.zArgv0 = argv[0];
   zPrompt = "<stdin>";
@@ -612,13 +613,15 @@ int main(int argc, char **argv){
       zPrompt = "<stdin>";
     }
     while( !feof(in) ){
-      zIn = realloc(zIn, nAlloc);
-      if( zIn==0 ) fatalError("out of memory");
       got = fread(zIn+nIn, 1, nAlloc-nIn-1, in); 
       nIn += (int)got;
       zIn[nIn] = 0;
       if( got==0 ) break;
-      nAlloc += nAlloc+1000;
+      if( nAlloc - nIn - 1 < 100 ){
+        nAlloc += nAlloc+1000;
+        zIn = realloc(zIn, nAlloc);
+        if( zIn==0 ) fatalError("out of memory");
+      }
     }
     if( in!=stdin ) fclose(in);
     lastPct = -1;
@@ -670,6 +673,8 @@ int main(int argc, char **argv){
             lastPct = pct;
           }
         }
+      }else if( nInFile>1 ){
+        printf("%s\n", zPrompt);
       }
       fflush(stdout);
 
@@ -803,8 +808,10 @@ int main(int argc, char **argv){
   /* Report total number of tests run
   */
   if( nTest>1 && !quietFlag ){
-    printf("%s: 0 errors out of %d tests\nSQLite %s %s\n",
-           g.zArgv0, nTest, sqlite3_libversion(), sqlite3_sourceid());
+    sqlite3_int64 iElapse = timeOfDay() - iBegin;
+    printf("%s: 0 errors out of %d tests in %d.%03d seconds\nSQLite %s %s\n",
+           g.zArgv0, nTest, (int)(iElapse/1000), (int)(iElapse%1000),
+           sqlite3_libversion(), sqlite3_sourceid());
   }
 
   /* Write the unique test cases if the --unique-cases flag was used