Modify the patternCompare() function (used for GLOB, LIKE) to better handle

patterns containing multiple wildcard characters ("*", "%").

FossilOrigin-Name: c5e5614d98a752738c081fecdd1e349a1a92b0e5

manifest

@@ -1,5 +1,5 @@
-C Add\sthe\sremember(V,PTR)\sextension\sfunction\swhich\scopies\san\sSQL\svalue\sinto\nan\sapplication\svariable.
+C Modify\sthe\spatternCompare()\sfunction\s(used\sfor\sGLOB,\sLIKE)\sto\sbetter\shandle\npatterns\scontaining\smultiple\swildcard\scharacters\s("*",\s"%").
-D 2016-11-30T16:54:52.848
+D 2016-12-01T17:34:59.799
 F Makefile.in 7639c6a09da11a9c7c6f2630fc981ee588d1072d
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@ -344,7 +344,7 @@ F src/delete.c cac97d1117a3008934da3a6a587b3608e65e1495
 F src/expr.c b22e09630f874c52db0770973b7ce55ee50c1dde
 F src/fault.c 160a0c015b6c2629d3899ed2daf63d75754a32bb
 F src/fkey.c b9ca262f6ad4d030a3cab737ebf9b0b3c8b4ac80
-F src/func.c 7057bc2c105b82faa668d8e2ec85fad4540e5c51
+F src/func.c 528e92597efe1bb80b5dfc18184bd6cbf50d0cf9
 F src/global.c 9da4ca5d74b90715f0ec4957f3d17a4749009f34
 F src/hash.c 63d0ee752a3b92d4695b2b1f5259c4621b2cfebd
 F src/hash.h ab34c5c54a9e9de2e790b24349ba5aab3dbb4fd4
@@ -1536,8 +1536,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 3816bb415ecfd4f36430d0fcbc878e382975de60 f0942c362f45ca1e986e142dbdd3ad957626dfb1
+P d2d30914d81022d7d4e1670caf9326524520deaf
-R cd510c86291ec9069bea94544a3e0b95
+R e10a8ca94d0faea9fbbc7bdc7c3a49de
-T +closed f0942c362f45ca1e986e142dbdd3ad957626dfb1
+T *branch * pattern-compare-optimization
-U drh
+T *sym-pattern-compare-optimization *
-Z 6b290cfef4656939d1e961e713e76c69
+T -sym-trunk *
+U dan
+Z 02660061daf6ca9953ba412794b057ac

manifest.uuid

@@ -1 +1 @@
-d2d30914d81022d7d4e1670caf9326524520deaf
+c5e5614d98a752738c081fecdd1e349a1a92b0e5

src/func.c

@@ -636,7 +636,8 @@ static int patternCompare(
   const u8 *zPattern,              /* The glob pattern */
   const u8 *zString,               /* The string to compare against the glob */
   const struct compareInfo *pInfo, /* Information about how to do the compare */
-  u32 matchOther                   /* The escape char (LIKE) or '[' (GLOB) */
+  u32 matchOther,                  /* The escape char (LIKE) or '[' (GLOB) */
+  int *pbSeenMatchAll              /* OUT: True if have seen matchAll */
 ){
   u32 c, c2;                       /* Next pattern and input string chars */
   u32 matchOne = pInfo->matchOne;  /* "?" or "_" */
@@ -649,6 +650,7 @@ static int patternCompare(
       /* Skip over multiple "*" characters in the pattern.  If there
       ** are also "?" characters, skip those as well, but consume a
       ** single character of the input string for each "?" skipped */
+      *pbSeenMatchAll = 1;
       while( (c=Utf8Read(zPattern)) == matchAll || c == matchOne ){
         if( c==matchOne && sqlite3Utf8Read(&zString)==0 ){
           return 0;
@@ -661,11 +663,14 @@ static int patternCompare(
           c = sqlite3Utf8Read(&zPattern);
           if( c==0 ) return 0;
         }else{
+          int bMA = 0;            /* True if patternCompare sees matchAll */
           /* "[...]" immediately follows the "*".  We have to do a slow
           ** recursive search in this case, but it is an unusual case. */
           assert( matchOther<0x80 );  /* '[' is a single-byte character */
           while( *zString
-                 && patternCompare(&zPattern[-1],zString,pInfo,matchOther)==0 ){
+            && patternCompare(&zPattern[-1],zString,pInfo,matchOther,&bMA)==0
+          ){
+            if( bMA ) return 0;
             SQLITE_SKIP_UTF8(zString);
           }
           return *zString!=0;
@@ -674,7 +679,7 @@ static int patternCompare(
 
       /* At this point variable c contains the first character of the
       ** pattern string past the "*".  Search in the input string for the
-      ** first matching character and recursively contine the match from
+      ** first matching character and recursively continue the match from
       ** that point.
       **
       ** For a case-insensitive search, set variable cx to be the same as
@@ -683,6 +688,7 @@ static int patternCompare(
       */
       if( c<=0x80 ){
         u32 cx;
+        int bMatchAll = 0;
         if( noCase ){
           cx = sqlite3Toupper(c);
           c = sqlite3Tolower(c);
@@ -691,12 +697,19 @@ static int patternCompare(
         }
         while( (c2 = *(zString++))!=0 ){
           if( c2!=c && c2!=cx ) continue;
-          if( patternCompare(zPattern,zString,pInfo,matchOther) ) return 1;
+          if( patternCompare(zPattern,zString,pInfo,matchOther, &bMatchAll) ){
+            return 1;
+          }
+          if( bMatchAll ) break;
         }
       }else{
+        int bMatchAll = 0;
         while( (c2 = Utf8Read(zString))!=0 ){
           if( c2!=c ) continue;
-          if( patternCompare(zPattern,zString,pInfo,matchOther) ) return 1;
+          if( patternCompare(zPattern,zString,pInfo,matchOther, &bMatchAll) ){
+            return 1;
+          }
+          if( bMatchAll ) break;
         }
       }
       return 0;
@@ -755,14 +768,16 @@ static int patternCompare(
 ** The sqlite3_strglob() interface.
 */
 int sqlite3_strglob(const char *zGlobPattern, const char *zString){
-  return patternCompare((u8*)zGlobPattern, (u8*)zString, &globInfo, '[')==0;
+  int dummy = 0;
+  return patternCompare((u8*)zGlobPattern, (u8*)zString, &globInfo, '[', &dummy)==0;
 }
 
 /*
 ** The sqlite3_strlike() interface.
 */
 int sqlite3_strlike(const char *zPattern, const char *zStr, unsigned int esc){
-  return patternCompare((u8*)zPattern, (u8*)zStr, &likeInfoNorm, esc)==0;
+  int dummy = 0;
+  return patternCompare((u8*)zPattern, (u8*)zStr, &likeInfoNorm, esc, &dummy)==0;
 }
 
 /*
@@ -840,10 +855,11 @@ static void likeFunc(
     escape = pInfo->matchSet;
   }
   if( zA && zB ){
+    int dummy = 0;
 #ifdef SQLITE_TEST
     sqlite3_like_count++;
 #endif
-    sqlite3_result_int(context, patternCompare(zB, zA, pInfo, escape));
+    sqlite3_result_int(context, patternCompare(zB, zA, pInfo, escape, &dummy));
   }
 }