diff --git a/manifest b/manifest
index ce4e8a342d..b808c9b433 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Attempting\sto\sopen\sa\slocked\stable\sfor\swriting\sshould\sfail\simmediately.\r\nTicket\s#842.\s(CVS\s1880)
-D 2004-08-08T19:43:30
+C Make\ssure\sthe\sargument\sto\sctype.h\smacros\sis\salways\san\sunsigned\scharacter.\nTicket\s#839.\s(CVS\s1881)
+D 2004-08-08T20:22:17
 F Makefile.in 4a5e570a9e2d35b09c31b3cf01b78cea764ade4b
 F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
 F README f1de682fbbd94899d50aca13d387d1b3fd3be2dd
@@ -29,16 +29,16 @@ F src/attach.c 0bd4f11da6999665da30625665a4096ba7898de6
 F src/auth.c 60db23b98bb94c8b0178180faaf49dc116674217
 F src/btree.c cfa5ed01838247be40c113cac528286675940801
 F src/btree.h 94dfec0a1722d33359b23e7e310f2b64ffedf029
-F src/build.c d1a2d7a99bb07a1ea4a019fcef6786546cb09f73
-F src/date.c e1bb384a7856c18dce9cadb0afbe6934ba5ddb00
+F src/build.c b6689d0c3b01d8552fb6dcd3b071be0b4194ca69
+F src/date.c a164e3a58f61306e82c5626e5fa16f861a9a7084
 F src/delete.c e81545e546f6bc87d7508a93a09ca70695265af3
 F src/encode.c a876af473d1d636faa3dca51c7571f2e007eea37
-F src/expr.c 0b8c89324d979895e6b0f31a6d7bf60edfee13ac
-F src/func.c b163fb49efec999eb7bf982f7de5b9be388301f3
+F src/expr.c f4a883c00ff3fea1aa2bae4694c3b3984dcf6757
+F src/func.c 7e2eeebe219aa612ce7a04c74ae6d57379c6656b
 F src/hash.c f0a2f22c2a7052d67053b5f4690ea3010bb3fb9f
 F src/hash.h 762d95f1e567664d1eafc1687de755626be962fb
 F src/insert.c bedcba371401395033a1a1c578d8fdc3fec87bec
-F src/legacy.c ad23746f15f67e34577621b1875f639c94839e1f
+F src/legacy.c 09b45fd3104da3175684d445f9be4e3c3a50c763
 F src/main.c 41da595846e299b757cc413d18de804f97f68748
 F src/md5.c 7ae1c39044b95de2f62e066f47bb1deb880a1070
 F src/os.h d1780e0db95cad01f213d48da22ab490eb4fd345
@@ -54,31 +54,31 @@ F src/os_win.h babd4e912967c6b09088cfe38a45e8005a07ba44
 F src/pager.c 37b2159056b4c965eb055b544b301d0e7cd561dd
 F src/pager.h 67739fe649f33be55dba522ca8a9cc4e42d14f71
 F src/parse.y 589b1a39b23092888adfa9ec1f3ded8a35e8e006
-F src/pragma.c c8be18093f0492f9983406647808781ca0073d8b
+F src/pragma.c 5cf335adfdac453a2d03ab0c82f93847c43bea81
 F src/printf.c 17b28a1eedfe8129b05de981719306c18c3f1327
 F src/random.c eff68e3f257e05e81eae6c4d50a51eb88beb4ff3
 F src/select.c cbed45f4af76ad7fdfc0a0df6878b2b3827ae1d4
-F src/shell.c 4b40fac1a07512d6b8dbdf8abe0b4660d777c9ce
+F src/shell.c 69d8036a8871c53603016cc6d240a3efaa9584df
 F src/sqlite.h.in c340a12b4d0521efb474dd000fba3bdfb18d76da
-F src/sqliteInt.h e408fb63f54c74e91ff8da1998e55b7040e57c2b
+F src/sqliteInt.h 251662c89dd35c4ed745681ff00758d19ffd0906
 F src/table.c 4521c278892f60e4d630788c0ea5cf4db1e75c49
 F src/tclsqlite.c cece44ee1d4427185e4ac85ddec79f31ac26965a
 F src/test1.c 9389fafc3c3a2a3b6bf4f7cffe1c7e8ccdd0be38
 F src/test2.c f4c2f3928f1998fd8cb75a81e33a60e025ea85d4
 F src/test3.c 94d0a2a90bccd85802488cb42c69ec8afd2e4646
-F src/test4.c a921a69821fd30209589228e64f94e9f715b6fe2
+F src/test4.c c38766914e924091516030b6a8b677d849c08bf0
 F src/test5.c b001fa7f1b9e2dc5c2331de62fc641b5ab2bd7a1
 F src/tokenize.c bc7a80e4cf54f42ea4b030c62261c4243133af84
 F src/trigger.c 360cf8f12edd4eb3a8a2895b136aac238c3cf44e
 F src/update.c b66b1896c9da54678ba3eff2bf0b4d291a95986a
 F src/utf.c f03535db72bfa09e24202ccdd245f21d2fc65f0a
-F src/util.c 2aacc79b7bf5df5859813dafd3bf3258f67a5234
+F src/util.c c1d903777e6d2e647d1c898db37d15fe3a1cc172
 F src/vacuum.c 9978a5760c2c430bc5b5e66505a02dad76f25813
 F src/vdbe.c 6eb69df6de99f69efcb2b50a914ebbb5cad867de
 F src/vdbe.h 75b241c02431b9c0f16eaa9cdbb34146c6287f52
 F src/vdbeInt.h 3d8e08c54dcb5ca2169db8bb3a37b81a12efaecd
 F src/vdbeapi.c 3be4ccab4ba6c21d60feffc48e22cf8c1643c6d5
-F src/vdbeaux.c daf40a292ec458ed962845a8d95d5c96bc242e04
+F src/vdbeaux.c 892a49f7bf8c46222108d6a9ba081ac578375744
 F src/vdbemem.c d4fa40d0dc1906e6c246092c990077da373e2b26
 F src/where.c cf8a54641eea01f1af5d09529ad69166db92f658
 F test/all.test 3b692eb43583b52c99c344b2fa8934512d179016
@@ -242,7 +242,7 @@ F www/tclsqlite.tcl 06a86cba4d7fc88e2bcd633b57702d3d16abebb5
 F www/vdbe.tcl 59288db1ac5c0616296b26dce071c36cb611dfe9
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl a8335bce47cc2fddb07f19052cb0cb4d9129a8e4
-P d33771a303d9c20dd477b1a973024ff763203211
-R d49220a972e86ed5f2222c14670b9ccc
+P fc879a9b1d05ddb8f8c552c1d334597e41b29b27
+R ceec00facf1ec0be155668de66e15a7f
 U drh
-Z 6bdb053e7f2204021eb022af1f2d8d7a
+Z 81e48ab08dabe4361601dbea6019899e
diff --git a/manifest.uuid b/manifest.uuid
index 81d0aaea63..a9ff155d66 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-fc879a9b1d05ddb8f8c552c1d334597e41b29b27
\ No newline at end of file
+b065973898c06a81c69b70b3fa91c79334bd9b9a
\ No newline at end of file
diff --git a/src/build.c b/src/build.c
index 1f12a5e162..4106ba0e49 100644
--- a/src/build.c
+++ b/src/build.c
@@ -23,7 +23,7 @@
 **     ROLLBACK
 **     PRAGMA
 **
-** $Id: build.c,v 1.244 2004/07/26 00:31:09 drh Exp $
+** $Id: build.c,v 1.245 2004/08/08 20:22:17 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -1209,7 +1209,8 @@ static int identLength(const char *z){
 ** Write an identifier onto the end of the given string.  Add
 ** quote characters as needed.
 */
-static void identPut(char *z, int *pIdx, char *zIdent){
+static void identPut(char *z, int *pIdx, char *zSignedIdent){
+  unsigned char *zIdent = (unsigned char*)zSignedIdent;
   int i, j, needQuote;
   i = *pIdx;
   for(j=0; zIdent[j]; j++){
@@ -1439,7 +1440,7 @@ void sqlite3CreateView(
 ){
   Table *p;
   int n;
-  const char *z;
+  const unsigned char *z;
   Token sEnd;
   DbFixer sFix;
   Token *pName;
@@ -1478,7 +1479,7 @@ void sqlite3CreateView(
   }
   sEnd.n = 0;
   n = sEnd.z - pBegin->z;
-  z = pBegin->z;
+  z = (const unsigned char*)pBegin->z;
   while( n>0 && (z[n-1]==';' || isspace(z[n-1])) ){ n--; }
   sEnd.z = &z[n-1];
   sEnd.n = 1;
diff --git a/src/date.c b/src/date.c
index 1b015b3562..a1c269af30 100644
--- a/src/date.c
+++ b/src/date.c
@@ -16,7 +16,7 @@
 ** sqlite3RegisterDateTimeFunctions() found at the bottom of the file.
 ** All other code has file scope.
 **
-** $Id: date.c,v 1.32 2004/07/20 00:39:15 drh Exp $
+** $Id: date.c,v 1.33 2004/08/08 20:22:17 drh Exp $
 **
 ** NOTES:
 **
@@ -104,7 +104,7 @@ static int getDigits(const char *zDate, ...){
     pVal = va_arg(ap, int*);
     val = 0;
     while( N-- ){
-      if( !isdigit(*zDate) ){
+      if( !isdigit(*(u8*)zDate) ){
         return cnt;
       }
       val = val*10 + *zDate - '0';
@@ -145,7 +145,7 @@ static int getValue(const char *z, double *pR){
 static int parseTimezone(const char *zDate, DateTime *p){
   int sgn = 0;
   int nHr, nMn;
-  while( isspace(*zDate) ){ zDate++; }
+  while( isspace(*(u8*)zDate) ){ zDate++; }
   p->tz = 0;
   if( *zDate=='-' ){
     sgn = -1;
@@ -160,7 +160,7 @@ static int parseTimezone(const char *zDate, DateTime *p){
   }
   zDate += 5;
   p->tz = sgn*(nMn + nHr*60);
-  while( isspace(*zDate) ){ zDate++; }
+  while( isspace(*(u8*)zDate) ){ zDate++; }
   return *zDate!=0;
 }
 
@@ -184,10 +184,10 @@ static int parseHhMmSs(const char *zDate, DateTime *p){
       return 1;
     }
     zDate += 2;
-    if( *zDate=='.' && isdigit(zDate[1]) ){
+    if( *zDate=='.' && isdigit((u8)zDate[1]) ){
       double rScale = 1.0;
       zDate++;
-      while( isdigit(*zDate) ){
+      while( isdigit(*(u8*)zDate) ){
         ms = ms*10.0 + *zDate - '0';
         rScale *= 10.0;
         zDate++;
@@ -272,7 +272,7 @@ static int parseYyyyMmDd(const char *zDate, DateTime *p){
     return 1;
   }
   zDate += 10;
-  while( isspace(*zDate) ){ zDate++; }
+  while( isspace(*(u8*)zDate) ){ zDate++; }
   if( parseHhMmSs(zDate, p)==0 ){
     /* We got the time */
   }else if( *zDate==0 ){
@@ -575,7 +575,7 @@ static int parseModifier(const char *zMod, DateTime *p){
         const char *z2 = z;
         DateTime tx;
         int day;
-        if( !isdigit(*z2) ) z2++;
+        if( !isdigit(*(u8*)z2) ) z2++;
         memset(&tx, 0, sizeof(tx));
         if( parseHhMmSs(z2, &tx) ) break;
         computeJD(&tx);
@@ -590,7 +590,7 @@ static int parseModifier(const char *zMod, DateTime *p){
         break;
       }
       z += n;
-      while( isspace(z[0]) ) z++;
+      while( isspace(*(u8*)z) ) z++;
       n = strlen(z);
       if( n>10 || n<3 ) break;
       if( z[n-1]=='s' ){ z[n-1] = 0; n--; }
diff --git a/src/expr.c b/src/expr.c
index f29d2bfd27..a01ab8aa35 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -12,7 +12,7 @@
 ** This file contains routines used for analyzing expressions and
 ** for generating VDBE code that evaluates expressions in SQLite.
 **
-** $Id: expr.c,v 1.153 2004/07/26 00:31:09 drh Exp $
+** $Id: expr.c,v 1.154 2004/08/08 20:22:17 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -513,7 +513,7 @@ int sqlite3ExprIsInteger(Expr *p, int *pValue){
       break;
     }
     case TK_STRING: {
-      const char *z = p->token.z;
+      const u8 *z = (u8*)p->token.z;
       int n = p->token.n;
       if( n>0 && z[0]=='-' ){ z++; n--; }
       while( n>0 && *z && isdigit(*z) ){ z++; n--; }
diff --git a/src/func.c b/src/func.c
index 1d9d2be10a..bad96d2a17 100644
--- a/src/func.c
+++ b/src/func.c
@@ -16,7 +16,7 @@
 ** sqliteRegisterBuildinFunctions() found at the bottom of the file.
 ** All other code has file scope.
 **
-** $Id: func.c,v 1.79 2004/07/18 23:06:54 drh Exp $
+** $Id: func.c,v 1.80 2004/08/08 20:22:18 drh Exp $
 */
 #include <ctype.h>
 #include <math.h>
@@ -208,7 +208,7 @@ static void upperFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
   if( z==0 ) return;
   strcpy(z, sqlite3_value_text(argv[0]));
   for(i=0; z[i]; i++){
-    if( islower(z[i]) ) z[i] = toupper(z[i]);
+    z[i] = toupper(z[i]);
   }
   sqlite3_result_text(context, z, -1, SQLITE_TRANSIENT);
   sqliteFree(z);
@@ -221,7 +221,7 @@ static void lowerFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
   if( z==0 ) return;
   strcpy(z, sqlite3_value_text(argv[0]));
   for(i=0; z[i]; i++){
-    if( isupper(z[i]) ) z[i] = tolower(z[i]);
+    z[i] = tolower(z[i]);
   }
   sqlite3_result_text(context, z, -1, SQLITE_TRANSIENT);
   sqliteFree(z);
@@ -691,7 +691,7 @@ static void quoteFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
 */
 static void soundexFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
   char zResult[8];
-  const char *zIn;
+  const u8 *zIn;
   int i, j;
   static const unsigned char iCode[] = {
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -704,7 +704,7 @@ static void soundexFunc(sqlite3_context *context, int argc, sqlite3_value **argv
     1, 2, 6, 2, 3, 0, 1, 0, 2, 0, 2, 0, 0, 0, 0, 0,
   };
   assert( argc==1 );
-  zIn = sqlite3_value_text(argv[0]);
+  zIn = (u8*)sqlite3_value_text(argv[0]);
   for(i=0; zIn[i] && !isalpha(zIn[i]); i++){}
   if( zIn[i] ){
     zResult[0] = toupper(zIn[i]);
diff --git a/src/legacy.c b/src/legacy.c
index 664705ba0b..58b18504fe 100644
--- a/src/legacy.c
+++ b/src/legacy.c
@@ -14,7 +14,7 @@
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 **
-** $Id: legacy.c,v 1.3 2004/05/26 23:25:31 drh Exp $
+** $Id: legacy.c,v 1.4 2004/08/08 20:22:18 drh Exp $
 */
 
 #include "sqliteInt.h"
@@ -108,7 +108,7 @@ int sqlite3_exec(
         if( rc!=SQLITE_SCHEMA ){
           nRetry = 0;
           zSql = zLeftover;
-          while( isspace(zSql[0]) ) zSql++;
+          while( isspace((unsigned char)zSql[0]) ) zSql++;
         }
         break;
       }
diff --git a/src/pragma.c b/src/pragma.c
index 5c865f5f65..a7189945a3 100644
--- a/src/pragma.c
+++ b/src/pragma.c
@@ -11,7 +11,7 @@
 *************************************************************************
 ** This file contains code used to implement the PRAGMA command.
 **
-** $Id: pragma.c,v 1.58 2004/07/22 01:19:35 drh Exp $
+** $Id: pragma.c,v 1.59 2004/08/08 20:22:18 drh Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -24,8 +24,8 @@
 /*
 ** Interpret the given string as a boolean value.
 */
-static int getBoolean(const char *z){
-  static char *azTrue[] = { "yes", "on", "true" };
+static int getBoolean(const u8 *z){
+  static const u8 *azTrue[] = { "yes", "on", "true" };
   int i;
   if( z[0]==0 ) return 0;
   if( isdigit(z[0]) || (z[0]=='-' && isdigit(z[1])) ){
@@ -47,9 +47,9 @@ static int getBoolean(const char *z){
 ** to support legacy SQL code.  The safety level used to be boolean
 ** and older scripts may have used numbers 0 for OFF and 1 for ON.
 */
-static int getSafetyLevel(char *z){
+static int getSafetyLevel(u8 *z){
   static const struct {
-    const char *zWord;
+    const u8 *zWord;
     int val;
   } aKey[] = {
     { "no",    0 },
diff --git a/src/shell.c b/src/shell.c
index cfaa813a6f..3cfae8768e 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -12,7 +12,7 @@
 ** This file contains code to implement the "sqlite" command line
 ** utility for accessing SQLite databases.
 **
-** $Id: shell.c,v 1.109 2004/08/04 15:16:55 drh Exp $
+** $Id: shell.c,v 1.110 2004/08/08 20:22:18 drh Exp $
 */
 #include <stdlib.h>
 #include <string.h>
@@ -488,9 +488,9 @@ static void set_table_name(struct callback_data *p, const char *zName){
     p->zDestTable = 0;
   }
   if( zName==0 ) return;
-  needQuote = !isalpha(*zName) && *zName!='_';
+  needQuote = !isalpha((unsigned char)*zName) && *zName!='_';
   for(i=n=0; zName[i]; i++, n++){
-    if( !isalnum(zName[i]) && zName[i]!='_' ){
+    if( !isalnum((unsigned char)zName[i]) && zName[i]!='_' ){
       needQuote = 1;
       if( zName[i]=='\'' ) n++;
     }
@@ -754,7 +754,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
   /* Parse the input line into tokens.
   */
   while( zLine[i] && nArg<ArraySize(azArg) ){
-    while( isspace(zLine[i]) ){ i++; }
+    while( isspace((unsigned char)zLine[i]) ){ i++; }
     if( zLine[i]==0 ) break;
     if( zLine[i]=='\'' || zLine[i]=='"' ){
       int delim = zLine[i++];
@@ -766,7 +766,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
       if( delim=='"' ) resolve_backslashes(azArg[nArg-1]);
     }else{
       azArg[nArg++] = &zLine[i];
-      while( zLine[i] && !isspace(zLine[i]) ){ i++; }
+      while( zLine[i] && !isspace((unsigned char)zLine[i]) ){ i++; }
       if( zLine[i] ) zLine[i++] = 0;
       resolve_backslashes(azArg[nArg-1]);
     }
@@ -831,7 +831,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
     char *z = azArg[1];
     int val = atoi(azArg[1]);
     for(j=0; z[j]; j++){
-      if( isupper(z[j]) ) z[j] = tolower(z[j]);
+      z[j] = tolower((unsigned char)z[j]);
     }
     if( strcmp(z,"on")==0 ){
       val = 1;
@@ -850,7 +850,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
     char *z = nArg>=2 ? azArg[1] : "1";
     int val = atoi(z);
     for(j=0; z[j]; j++){
-      if( isupper(z[j]) ) z[j] = tolower(z[j]);
+      z[j] = tolower((unsigned char)z[j]);
     }
     if( strcmp(z,"on")==0 ){
       val = 1;
@@ -894,7 +894,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
     char *z = azArg[1];
     int val = atoi(azArg[1]);
     for(j=0; z[j]; j++){
-      if( isupper(z[j]) ) z[j] = tolower(z[j]);
+      z[j] = tolower((unsigned char)z[j]);
     }
     if( strcmp(z,"on")==0 ){
       val = 1;
@@ -1295,7 +1295,7 @@ static int do_meta_command(char *zLine, struct callback_data *p){
 ** z[] is N characters long.
 */
 static int _ends_with_semicolon(const char *z, int N){
-  while( N>0 && isspace(z[N-1]) ){ N--; }
+  while( N>0 && isspace((unsigned char)z[N-1]) ){ N--; }
   return N>0 && z[N-1]==';';
 }
 
@@ -1304,7 +1304,7 @@ static int _ends_with_semicolon(const char *z, int N){
 */
 static int _all_whitespace(const char *z){
   for(; *z; z++){
-    if( isspace(*z) ) continue;
+    if( isspace(*(unsigned char*)z) ) continue;
     if( *z=='/' && z[1]=='*' ){
       z += 2;
       while( *z && (*z!='*' || z[1]!='/') ){ z++; }
@@ -1330,7 +1330,7 @@ static int _all_whitespace(const char *z){
 */
 static int _is_command_terminator(const char *zLine){
   extern int sqlite3StrNICmp(const char*,const char*,int);
-  while( isspace(*zLine) ){ zLine++; };
+  while( isspace(*(unsigned char*)zLine) ){ zLine++; };
   if( zLine[0]=='/' && _all_whitespace(&zLine[1]) ) return 1;  /* Oracle */
   if( sqlite3StrNICmp(zLine,"go",2)==0 && _all_whitespace(&zLine[2]) ){
     return 1;  /* SQL Server */
@@ -1369,7 +1369,7 @@ static void process_input(struct callback_data *p, FILE *in){
     }
     if( zSql==0 ){
       int i;
-      for(i=0; zLine[i] && isspace(zLine[i]); i++){}
+      for(i=0; zLine[i] && isspace((unsigned char)zLine[i]); i++){}
       if( zLine[i]!=0 ){
         nSql = strlen(zLine);
         zSql = malloc( nSql+1 );
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 3415d981cd..5ae24c4b13 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -11,7 +11,7 @@
 *************************************************************************
 ** Internal interface definitions for SQLite.
 **
-** @(#) $Id: sqliteInt.h,v 1.314 2004/08/07 23:54:48 drh Exp $
+** @(#) $Id: sqliteInt.h,v 1.315 2004/08/08 20:22:18 drh Exp $
 */
 #ifndef _SQLITEINT_H_
 #define _SQLITEINT_H_
@@ -700,9 +700,9 @@ struct Index {
 ** and Token.n when Token.z==0.
 */
 struct Token {
-  const char *z;      /* Text of the token.  Not NULL-terminated! */
-  unsigned dyn  : 1;  /* True for malloced memory, false for static */
-  unsigned n    : 31; /* Number of characters in this token */
+  const unsigned char *z; /* Text of the token.  Not NULL-terminated! */
+  unsigned dyn  : 1;      /* True for malloced memory, false for static */
+  unsigned n    : 31;     /* Number of characters in this token */
 };
 
 /*
diff --git a/src/test4.c b/src/test4.c
index 84da7b3b44..a5ebe0b1d5 100644
--- a/src/test4.c
+++ b/src/test4.c
@@ -11,7 +11,7 @@
 *************************************************************************
 ** Code for testing the the SQLite library in a multithreaded environment.
 **
-** $Id: test4.c,v 1.10 2004/06/08 00:02:35 danielk1977 Exp $
+** $Id: test4.c,v 1.11 2004/08/08 20:22:18 drh Exp $
 */
 #include "sqliteInt.h"
 #include "tcl.h"
@@ -106,7 +106,7 @@ static void *thread_main(void *pArg){
 ** the interpreter and return -1.
 */
 static int parse_thread_id(Tcl_Interp *interp, const char *zArg){
-  if( zArg==0 || zArg[0]==0 || zArg[1]!=0 || !isupper(zArg[0]) ){
+  if( zArg==0 || zArg[0]==0 || zArg[1]!=0 || !isupper((unsigned char)zArg[0]) ){
     Tcl_AppendResult(interp, "thread ID must be an upper case letter", 0);
     return -1;
   }
diff --git a/src/util.c b/src/util.c
index e2c5733a24..ac47fd7aeb 100644
--- a/src/util.c
+++ b/src/util.c
@@ -14,7 +14,7 @@
 ** This file contains functions for allocating memory, comparing
 ** strings, and stuff like that.
 **
-** $Id: util.c,v 1.111 2004/07/15 13:23:22 drh Exp $
+** $Id: util.c,v 1.112 2004/08/08 20:22:18 drh Exp $
 */
 #include "sqliteInt.h"
 #include <stdarg.h>
@@ -596,23 +596,23 @@ int sqlite3IsNumber(const char *z, int *realnum, u8 enc){
   int incr = (enc==SQLITE_UTF8?1:2);
   if( enc==SQLITE_UTF16BE ) z++;
   if( *z=='-' || *z=='+' ) z += incr;
-  if( !isdigit(*z) ){
+  if( !isdigit(*(u8*)z) ){
     return 0;
   }
   z += incr;
   if( realnum ) *realnum = 0;
-  while( isdigit(*z) ){ z += incr; }
+  while( isdigit(*(u8*)z) ){ z += incr; }
   if( *z=='.' ){
     z += incr;
-    if( !isdigit(*z) ) return 0;
-    while( isdigit(*z) ){ z += incr; }
+    if( !isdigit(*(u8*)z) ) return 0;
+    while( isdigit(*(u8*)z) ){ z += incr; }
     if( realnum ) *realnum = 1;
   }
   if( *z=='e' || *z=='E' ){
     z += incr;
     if( *z=='+' || *z=='-' ) z += incr;
-    if( !isdigit(*z) ) return 0;
-    while( isdigit(*z) ){ z += incr; }
+    if( !isdigit(*(u8*)z) ) return 0;
+    while( isdigit(*(u8*)z) ){ z += incr; }
     if( realnum ) *realnum = 1;
   }
   return *z==0;
@@ -639,14 +639,14 @@ double sqlite3AtoF(const char *z, const char **pzEnd){
   }else if( *z=='+' ){
     z++;
   }
-  while( isdigit(*z) ){
+  while( isdigit(*(u8*)z) ){
     v1 = v1*10.0 + (*z - '0');
     z++;
   }
   if( *z=='.' ){
     LONGDOUBLE_TYPE divisor = 1.0;
     z++;
-    while( isdigit(*z) ){
+    while( isdigit(*(u8*)z) ){
       v1 = v1*10.0 + (*z - '0');
       divisor *= 10.0;
       z++;
@@ -664,7 +664,7 @@ double sqlite3AtoF(const char *z, const char **pzEnd){
     }else if( *z=='+' ){
       z++;
     }
-    while( isdigit(*z) ){
+    while( isdigit(*(u8*)z) ){
       eval = eval*10 + *z - '0';
       z++;
     }
diff --git a/src/vdbeaux.c b/src/vdbeaux.c
index fc7681e383..012159b170 100644
--- a/src/vdbeaux.c
+++ b/src/vdbeaux.c
@@ -532,7 +532,7 @@ void sqlite3VdbePrintSql(Vdbe *p){
   pOp = &p->aOp[nOp-2];
   if( pOp->opcode==OP_Noop && pOp->p3!=0 ){
     const char *z = pOp->p3;
-    while( isspace(*z) ) z++;
+    while( isspace(*(u8*)z) ) z++;
     printf("SQL: [%s]\n", z);
   }
 #endif