Implement IsAsciiUpper and IsAsciiLower in base/strings/string_util.h

sql/connection.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sql/connection.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
@@ skipping 98 matching lines @@
     DCHECK_EQ(pages, 1);
 
   return rc;
 }
 
 // Be very strict on attachment point.  SQLite can handle a much wider
 // character set with appropriate quoting, but Chromium code should
 // just use clean names to start with.
 bool ValidAttachmentPoint(const char* attachment_point) {
   for (size_t i = 0; attachment_point[i]; ++i) {
-    if (!((attachment_point[i] >= '0' && attachment_point[i] <= '9') ||
-          (attachment_point[i] >= 'a' && attachment_point[i] <= 'z') ||
-          (attachment_point[i] >= 'A' && attachment_point[i] <= 'Z') ||
+    if (!(base::IsAsciiDigit(attachment_point[i]) ||
+          base::IsAsciiAlpha(attachment_point[i]) ||
           attachment_point[i] == '_')) {
       return false;
     }
   }
   return true;
 }
 
 void RecordSqliteMemory10Min() {
   const int64_t used = sqlite3_memory_used();
   UMA_HISTOGRAM_COUNTS("Sqlite.MemoryKB.TenMinutes", used / 1024);
@@ skipping 1850 matching lines @@
   ignore_result(Execute(kNoWritableSchema));
 
   return ret;
 }
 
 base::TimeTicks TimeSource::Now() {
   return base::TimeTicks::Now();
 }
 
 }  // namespace sql