Fix the ossfuzz.c test module so that it does not segfault after a

"PRAGMA empty_result_callbacks=1;".  Add the ossshell.c program for
simple command-line testing of ossfuzz.c.

FossilOrigin-Name: 6f2d43eca68175ed28abae3afa792095af906af2

main.mk

@@ -516,6 +516,11 @@ fuzzcheck$(EXE):	$(TOP)/test/fuzzcheck.c sqlite3.c sqlite3.h $(TOP)/test/ossfuzz
 		-DSQLITE_ENABLE_MEMSYS5 $(FUZZCHECK_OPT) -DSQLITE_OSS_FUZZ \
 		$(TOP)/test/fuzzcheck.c $(TOP)/test/ossfuzz.c sqlite3.c $(TLIBS) $(THREADLIB)
 
+ossshell$(EXE):	$(TOP)/test/ossfuzz.c $(TOP)/test/ossshell.c sqlite3.c sqlite3.h
+	$(TCCX) -o ossshell$(EXE) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \
+		-DSQLITE_ENABLE_MEMSYS5 $(FUZZCHECK_OPT) \
+		$(TOP)/test/ossfuzz.c $(TOP)/test/ossshell.c sqlite3.c $(TLIBS) $(THREADLIB)
+
 mptester$(EXE):	sqlite3.c $(TOP)/mptest/mptest.c
 	$(TCCX) -o $@ -I. $(TOP)/mptest/mptest.c sqlite3.c \
 		$(TLIBS) $(THREADLIB)

manifest

@@ -1,5 +1,5 @@
-C Avoid\sunnecessary\scalls\sto\ssqlite3ExprCacheAffinityChange()\swhen\sgenerating\nOP_MakeRecord\sopcodes\sthat\sdo\snot\schange\sany\sregister\saffinities.
-D 2016-11-14T15:28:56.925
+C Fix\sthe\sossfuzz.c\stest\smodule\sso\sthat\sit\sdoes\snot\ssegfault\safter\sa\n"PRAGMA\sempty_result_callbacks=1;".\s\sAdd\sthe\sossshell.c\sprogram\sfor\nsimple\scommand-line\stesting\sof\sossfuzz.c.
+D 2016-11-14T17:25:57.150
 F Makefile.in 6fd48ffcf7c2deea7499062d1f3747f986c19678
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc e0217f2d35a0448abbe4b066132ae20136e8b408
@@ -311,7 +311,7 @@ F ext/userauth/userauth.c 5fa3bdb492f481bbc1709fc83c91ebd13460c69e
 F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
 F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
 F magic.txt 8273bf49ba3b0c8559cb2774495390c31fd61c60
-F main.mk 4b5c097e286a7b57023547b674c508f14e51dd9d
+F main.mk ec15a47504f15b84390d84a376a91397b77d5e15
 F mkso.sh fd21c06b063bb16a5d25deea1752c2da6ac3ed83
 F mptest/config01.test 3c6adcbc50b991866855f1977ff172eb6d901271
 F mptest/config02.test 4415dfe36c48785f751e16e32c20b077c28ae504
@@ -985,7 +985,8 @@ F test/orderby7.test 3d1383d52ade5b9eb3a173b3147fdd296f0202da
 F test/orderby8.test 23ef1a5d72bd3adcc2f65561c654295d1b8047bd
 F test/orderby9.test 87fb9548debcc2cd141c5299002dd94672fa76a3
 F test/oserror.test b32dc34f2363ef18532e3a0a7358e3e7e321974f
-F test/ossfuzz.c 2d64a0e38ec35fb29c09f8474b64c43605e00ce4
+F test/ossfuzz.c ad79e867fb504338d324b08e0696db65a0c44d68
+F test/ossshell.c d9f1a6f43e7bab45d6be857a5800f5d4a1861db3
 F test/ovfl.test 199c482696defceacee8c8e0e0ef36da62726b2f
 F test/pager1.test 841868017e9dd3cb459b8d78862091a7d9cff21d
 F test/pager2.test 67b8f40ae98112bcdba1f2b2d03ea83266418c71
@@ -1455,7 +1456,7 @@ F tool/dbhash.c a06228aa21ebc4e6ea8daa486601d938499238a5
 F tool/extract.c 054069d81b095fbdc189a6f5d4466e40380505e2
 F tool/fast_vacuum.c 5ba0d6f5963a0a63bdc42840f678bad75b2ebce1
 F tool/fragck.tcl 5265a95126abcf6ab357f7efa544787e5963f439
-F tool/fuzzershell.c f294ca67a10e87db76af130d75b2c94be36359c6
+F tool/fuzzershell.c d5c870a07452caa5c70a8e49d6c64e403558686d
 F tool/genfkey.README cf68fddd4643bbe3ff8e31b8b6d8b0a1b85e20f4
 F tool/genfkey.test 4196a8928b78f51d54ef58e99e99401ab2f0a7e5
 F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
@@ -1532,7 +1533,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P e78f6f3bbf4781850960fe6741f7cba480f2c27d
-R 3fa0a5681db4ad4cdeeecb208061d048
+P e211c579b2f092e3283edd5fb9add7c5183bac35
+R f5446ee1d5f38bf5dd192848e11b9c1d
 U drh
-Z 63d0e6fa2d7d17a48902a7d1e28254c8
+Z e378b2bf2d2ef2294a0668dccb47568a

manifest.uuid

@@ -1 +1 @@
-e211c579b2f092e3283edd5fb9add7c5183bac35
+6f2d43eca68175ed28abae3afa792095af906af2

test/ossfuzz.c

@@ -18,7 +18,9 @@ static int progress_handler(void *pReturn) {
 */
 static int exec_handler(void *pCnt, int argc, char **argv, char **namev){
   int i;
-  for(i=0; i<argc; i++) sqlite3_free(sqlite3_mprintf("%s", argv[i]));
+  if( argv ){
+    for(i=0; i<argc; i++) sqlite3_free(sqlite3_mprintf("%s", argv[i]));
+  }
   return ((*(int*)pCnt)--)<=0;
 }
 

test/ossshell.c

@@ -0,0 +1,61 @@
+/*
+** This is a test interface for the ossfuzz.c module.  The ossfuzz.c module
+** is an adaptor for OSS-FUZZ.  (https://github.com/google/oss-fuzz)
+**
+** This program links against ossfuzz.c.  It reads files named on the
+** command line and passes them one by one into ossfuzz.c.
+*/
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "sqlite3.h"
+
+/*
+** The entry point in ossfuzz.c that this routine will be calling
+*/
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
+
+
+/*
+** Read files named on the command-line and invoke the fuzzer for
+** each one.
+*/
+int main(int argc, char **argv){
+  FILE *in;
+  int i;
+  int nErr = 0;
+  uint8_t *zBuf = 0;
+  size_t sz;
+
+  for(i=1; i<argc; i++){
+    const char *zFilename = argv[i];
+    in = fopen(zFilename, "rb");
+    if( in==0 ){
+      fprintf(stderr, "cannot open \"%s\"\n", zFilename);
+      nErr++;
+      continue;
+    }
+    fseek(in, 0, SEEK_END);
+    sz = ftell(in);
+    rewind(in);
+    zBuf = realloc(zBuf, sz);
+    if( zBuf==0 ){
+      fprintf(stderr, "cannot malloc() for %d bytes\n", (int)sz);
+      exit(1);
+    }
+    if( fread(zBuf, sz, 1, in)!=1 ){
+      fprintf(stderr, "cannot read %d bytes from \"%s\"\n",
+                       (int)sz, zFilename);
+      nErr++;
+    }else{
+      printf("%s... ", zFilename);
+      fflush(stdout);
+      (void)LLVMFuzzerTestOneInput(zBuf, sz);
+      printf("ok\n");
+    }
+    fclose(in);
+  }
+  free(zBuf);
+  return nErr;
+}

tool/fuzzershell.c

@@ -195,12 +195,14 @@ static int execCallback(void *NotUsed, int argc, char **argv, char **colv){
   int i;
   static unsigned cnt = 0;
   printf("ROW #%u:\n", ++cnt);
-  for(i=0; i<argc; i++){
-    printf(" %s=", colv[i]);
-    if( argv[i] ){
-      printf("[%s]\n", argv[i]);
-    }else{
-      printf("NULL\n");
+  if( argv ){
+    for(i=0; i<argc; i++){
+      printf(" %s=", colv[i]);
+      if( argv[i] ){
+        printf("[%s]\n", argv[i]);
+      }else{
+        printf("NULL\n");
+      }
     }
   }
   fflush(stdout);