Slight adjustment to the printf formatter large memory allocation detector

so that it does not overestimate the amount of space needed for
oversize %d conversions.

FossilOrigin-Name: 1aee70d6de8a9b17ebb74a7cb1dad65139cde1b615dcce4d15d3a476fda8676b

manifest

@@ -1,5 +1,5 @@
-C Prevent\sthe\sprintf\sformatter\sfrom\sdoing\slarge\smemory\sallocations\s-\slarger\nthan\seither\sthe\ssize\sof\sthe\sstatic\sbuffer\sfor\sinterfaces\slike\nsqlite3_snprintf(),\sor\slarger\sthan\sSQLITE_LIMIT_LENGTH\sfor\sinterfaces\sthat\nare\sassociated\swith\sa\sdatabase\sconnection.\s\sThis\shelps\sto\sprevent\sDOS\nattacks\son\sproducts\sthat\slet\shostile\ssources\sinject\sarbitrary\sSQL.\s\sIt\salso\nhelps\sfuzzers\srun\sfaster\sand\smore\seffectively.
-D 2019-02-01T20:29:04.040
+C Slight\sadjustment\sto\sthe\sprintf\sformatter\slarge\smemory\sallocation\sdetector\nso\sthat\sit\sdoes\snot\soverestimate\sthe\samount\sof\sspace\sneeded\sfor\noversize\s%d\sconversions.
+D 2019-02-01T21:08:27.686
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 178d8eb6840771149cee40b322d1b3be30d330198c522c903c1b66fb5a1bfca4
@@ -510,7 +510,7 @@ F src/pcache1.c fffd5250a323579384a3b3904302b9fe87e186ba24602af3013f749a0234ae98
 F src/pragma.c af67dedaad8bafe9a5f9adcec32a0da6dd118617dd8220ad1d118f5a6bf83a02
 F src/pragma.h b774c8fdd63ed468ab8206b9b530d5d2523ed8889fbb72d1143d09272d5c6b2c
 F src/prepare.c 78027c6231fbb19ca186a5f5f0c0a1375d9c2cec0655273f9bd90d9ff74a34b3
-F src/printf.c 15c8c8c4095cdfeb6a295630b6914fbb702e68d06fc9fa08ff18cd3db6c35596
+F src/printf.c cbf27c320091a83279d1738f68a27a9fe01698c607ce80516ab6bdb5a9c36a1a
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c c8f207247472c41ac73d738e1c1a80719ad253d1dbb617ed57740492b2a6c097
 F src/rowset.c d977b011993aaea002cab3e0bb2ce50cf346000dff94e944d547b989f4b1fe93
@@ -1804,7 +1804,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 40d8f8ae87abf928542c4e558a4c3a3eab18776a3e8db7ca1c5e5f744ca0bce3
-R 39962f884b7a14fe935665eaeaac0027
+P 179e5d46054e5c86f53a79b7a0823d9a383da8391ad1d3c3b22645927a1e052b
+R 50c42a74fe98f5dbb904cae1cb8cbfbb
 U drh
-Z 9dd5bee31b2eabbe1bf794461fb9903d
+Z 1fdda9ae13508dc111d3e51c4aa9232f

manifest.uuid

@@ -1 +1 @@
-179e5d46054e5c86f53a79b7a0823d9a383da8391ad1d3c3b22645927a1e052b
+1aee70d6de8a9b17ebb74a7cb1dad65139cde1b615dcce4d15d3a476fda8676b

src/printf.c

@@ -442,7 +442,9 @@ void sqlite3_str_vappendf(
           nOut = etBUFSIZE;
           zOut = buf;
         }else{
-          u64 n = (u64)precision + 10 + precision/3;
+          u64 n;
+          n = (u64)precision + 10;
+          if( cThousand ) n += precision/3;
           zOut = zExtra = printfTempBuf(pAccum, n);
           if( zOut==0 ) return;
           nOut = (int)n;