From: drh <drh@noemail.net>
Date: Fri, 16 Dec 2011 00:33:04 +0000 (+0000)
Subject: Make sure the antipenultimate character of master-journal filenames is a "9"
X-Git-Tag: mountain-lion~8^2~37^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f580860f5196fc51fd5d9b6f42fe89e5b0573adc;p=thirdparty%2Fsqlite.git

Make sure the antipenultimate character of master-journal filenames is a "9"
in order to avoid collisions with other files in 8+3 filename mode.  Also,
limit the number of attempts at finding a unique master-journal filename.

FossilOrigin-Name: 34a0483605d36e6cf03065ed0df33fb1f7c8a272
---

diff --git a/manifest b/manifest
index aec2b27521..c6cfc989a6 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C When\sdeleting\sa\sfile\swith\sthe\smultiplexor\sVFS,\salso\sdelete\sany\soverflow\sfiles\sthat\sexist.
-D 2011-12-15T17:00:10.854
+C Make\ssure\sthe\santipenultimate\scharacter\sof\smaster-journal\sfilenames\sis\sa\s"9"\nin\sorder\sto\savoid\scollisions\swith\sother\sfiles\sin\s8+3\sfilename\smode.\s\sAlso,\nlimit\sthe\snumber\sof\sattempts\sat\sfinding\sa\sunique\smaster-journal\sfilename.
+D 2011-12-16T00:33:04.352
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5b4a3e12a850b021547e43daf886b25133b44c07
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -237,13 +237,13 @@ F src/tokenize.c c819d9f72168a035d545a5bdafe9b085b20df705
 F src/trigger.c 1cfb80e2290ef66ea89cb4e821caae65a02c0d56
 F src/update.c 25e046a8f69d5e557aabde2000487b8545509d8d
 F src/utf.c 890c67dcfcc7a74623c95baac7535aadfe265e84
-F src/util.c 01238e2b0f24a14779181dbf991fe02620a80e31
+F src/util.c 343508d359df65685b62e63964a40e7af4cfbe05
 F src/vacuum.c 0c0ba2242355c6048d65e2b333abe0f7c06348fa
 F src/vdbe.c a7ab9993ec5a4d9479dc99671faec061fbf9b889
 F src/vdbe.h f0725ee997db869ecae5bb70a71612aabeca7755
 F src/vdbeInt.h 9498fc98a2c9e349a4ef13455ff5a3e898f40176
 F src/vdbeapi.c 4dbba7f94f127f6ea8d2d0505ee1f98e5ffbf546
-F src/vdbeaux.c 45713a5f8f4f36195f503b30153ddef292323f88
+F src/vdbeaux.c 896ce3c48bf1bf27a1330589a20daa2db0222381
 F src/vdbeblob.c 32f2a4899d67f69634ea4dd93e3f651936d732cb
 F src/vdbemem.c 2fc78b3e0fabcc1eaa23cd79dd2e30e6dcfe1e56
 F src/vdbesort.c 468d43c057063e54da4f1988b38b4f46d60e7790
@@ -978,7 +978,7 @@ F tool/tostr.awk e75472c2f98dd76e06b8c9c1367f4ab07e122d06
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings-clang.sh 9f406d66e750e8ac031c63a9ef3248aaa347ef2a
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
-P e05f8a2998f4f4cbdb65702baa65893c538b3d38
-R 45b2cf463e6285a0d96697332c4d9aa9
-U dan
-Z 16b7798bc9bd7dfe8e0e630d52e6558b
+P 3af1feaa35d3fb2e7be550cd32a727001b874938
+R 398b3e3805c532cf24ac8d99750e0da2
+U drh
+Z ebbc2fb95389a75c4e570b61ca8c6d99
diff --git a/manifest.uuid b/manifest.uuid
index e4ed76872d..b3c3bab442 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-3af1feaa35d3fb2e7be550cd32a727001b874938
\ No newline at end of file
+34a0483605d36e6cf03065ed0df33fb1f7c8a272
\ No newline at end of file
diff --git a/src/util.c b/src/util.c
index ffbf7daadf..d27f6fdf26 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1169,6 +1169,7 @@ int sqlite3AbsInt32(int x){
 **     test.db-journal    =>   test.nal
 **     test.db-wal        =>   test.wal
 **     test.db-shm        =>   test.shm
+**     test.db-mj7f3319fa =>   test.9fa
 */
 void sqlite3FileSuffix3(const char *zBaseFilename, char *z){
 #if SQLITE_ENABLE_8_3_NAMES<2
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index 7c69d28cf6..2e01c982e5 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -1824,16 +1824,26 @@ static int vdbeCommit(sqlite3 *db, Vdbe *p){
     sqlite3_file *pMaster = 0;
     i64 offset = 0;
     int res;
+    int retryCount = 0;
 
     /* Select a master journal file name */
     do {
       u32 iRandom;
+      if( retryCount++>100 ){
+        sqlite3_log(SQLITE_FULL, "cannot create a master journal filename");
+        rc = SQLITE_FULL;
+        break;
+      }
       sqlite3DbFree(db, zMaster);
       sqlite3_randomness(sizeof(iRandom), &iRandom);
-      zMaster = sqlite3MPrintf(db, "%s-mj%08X", zMainFile, iRandom&0x7fffffff);
+      zMaster = sqlite3MPrintf(db, "%s-mj%06X9%02X", zMainFile,
+                               (iRandom>>8)&0xffffff, iRandom&0xff);
       if( !zMaster ){
         return SQLITE_NOMEM;
       }
+      /* The antipenultimate character of the master journal name must
+      ** be "9" to avoid name collisions when using 8+3 filenames. */
+      assert( zMaster[strlen(zMaster)-3]=='9' );
       sqlite3FileSuffix3(zMainFile, zMaster);
       rc = sqlite3OsAccess(pVfs, zMaster, SQLITE_ACCESS_EXISTS, &res);
     }while( rc==SQLITE_OK && res );