In the printf() library, measure width and precision in characters rather

than bytes if the "!" (alternate-form-2) flag is present on a %s or %z
substitution.

FossilOrigin-Name: ca31c6630422fca70e626dd38aae96296bd8535d491ca52391624a5e7e663636

manifest

@@ -1,5 +1,5 @@
-C Only\stry\sto\suse\sthe\sgeteuid()\sinterface\son\sunix\sif\sHAVE_FCHOWN\sis\sdefined.\nThis\sfixes\sthe\sbuild\sfor\svxWorks,\swe\sare\stold.
+C In\sthe\sprintf()\slibrary,\smeasure\swidth\sand\sprecision\sin\scharacters\srather\nthan\sbytes\sif\sthe\s"!"\s(alternate-form-2)\sflag\sis\spresent\son\sa\s%s\sor\s%z\nsubstitution.
-D 2018-02-19T16:34:31.891
+D 2018-02-19T17:03:23.575
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 7a3f714b4fcf793108042b7b0a5c720b0b310ec84314d61ba7f3f49f27e550ea
@@ -484,7 +484,7 @@ F src/pcache1.c 716975564c15eb6679e97f734cec1bfd6c16ac3d4010f05f1f8e509fc7d19880
 F src/pragma.c bea56df3ae0637768c0da4fbbb8f2492f780980d95000034a105ff291bf7ca69
 F src/pragma.h bb83728944b42f6d409c77f5838a8edbdb0fe83046c5496ffc9602b40340a324
 F src/prepare.c 259f4e7960c47082c9653f3d5f0c294abd68bb9c3aab86de7630700cba1c20fb
-F src/printf.c 9506b4b96e59c0467047155f09015750cb2878aeda3d39e5610c1192ddc3c41c
+F src/printf.c a94897345b3228d97c6aa06297890b7c62bc47acc86e34d3634d125426d78695
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c bbee7e31d369a18a2f4836644769882e9c5d40ef4a3af911db06410b65cb3730
 F src/rowset.c 7b7e7e479212e65b723bf40128c7b36dc5afdfac
@@ -1707,7 +1707,10 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 88258770adead70fa101c74e266a37bb9aaffac0ba738a4b345617feb8c46477
+P 38f654dc117bb11d61407327884b5c913cfaf920547bebc4ce5a4cf983e5c20e
-R 2e4bdb0c045376ff7154d29ff239bf61
+R 07cd50bae7c4080dd411c728ce9cf3a0
+T *branch * printf-enhancement
+T *sym-printf-enhancement *
+T -sym-trunk *
 U drh
-Z 37b9f8fa92af1d03e78cb9f20faaf7e7
+Z 9d6ee38fe0b61a32cc5a7309de027572

manifest.uuid

@@ -1 +1 @@
-38f654dc117bb11d61407327884b5c913cfaf920547bebc4ce5a4cf983e5c20e
+ca31c6630422fca70e626dd38aae96296bd8535d491ca52391624a5e7e663636

src/printf.c

@@ -654,10 +654,25 @@ void sqlite3VXPrintf(
           zExtra = bufpt;
         }
         if( precision>=0 ){
+          if( flag_altform2 ){
+            /* Set length to the number of bytes needed in order to display
+            ** precision characters */
+            unsigned char *z = (unsigned char*)bufpt;
+            while( precision-- > 0 && z[0] ){
+              SQLITE_SKIP_UTF8(z);
+            }
+            length = (int)(z - (unsigned char*)bufpt);
+          }else{
             for(length=0; length<precision && bufpt[length]; length++){}
+          }
         }else{
           length = 0x7fffffff & (int)strlen(bufpt);
         }
+        if( flag_altform2 && width>0 ){
+          /* Adjust width to account for extra bytes in UTF-8 characters */
+          int ii = length - 1;
+          while( ii>=0 ) if( (bufpt[ii--] & 0xc0)==0x80 ) width++;
+        }
         break;
       case etSQLESCAPE:           /* Escape ' characters */
       case etSQLESCAPE2:          /* Escape ' and enclose in '...' */
@@ -700,7 +715,7 @@ void sqlite3VXPrintf(
         if( needQuote ) bufpt[j++] = q;
         bufpt[j] = 0;
         length = j;
-        /* The precision in %q and %Q means how many input characters to
+        /* The precision in %q and %Q means how many input bytes to
         ** consume, not the length of the output...
         ** if( precision>=0 && precision<length ) length = precision; */
         break;
@@ -742,7 +757,10 @@ void sqlite3VXPrintf(
     /*
     ** The text of the conversion is pointed to by "bufpt" and is
     ** "length" characters long.  The field width is "width".  Do
-    ** the output.
+    ** the output.  Both length and width are in bytes, not characters,
+    ** at this point.  If the "!" flag was present on string conversions
+    ** indicating that width and precision should be expressed in characters,
+    ** then the values have been translated prior to reaching this point.
     */
     width -= length;
     if( width>0 ){