merge.

checkpoint.
does not compile.

sql/sql_string.cc

@@ -27,6 +27,9 @@
 
 #include "sql_string.h"
 
+#ifdef MYSQL_CLIENT
+#error Attempt to use server-side sql_string on client. Use client/sql_string.cc
+#endif 
 /*****************************************************************************
 ** String functions
 *****************************************************************************/
@@ -58,13 +61,13 @@ bool String::real_alloc(uint32 length)
 
 bool String::realloc(uint32 alloc_length)
 {
-  uint32 len=ALIGN_SIZE(alloc_length+1);
-  DBUG_ASSERT(len > alloc_length);
-  if (len <= alloc_length)
-    return TRUE;                                 /* Overflow */
-  if (Alloced_length < len)
+  if (Alloced_length <= alloc_length)
   {
     char *new_ptr;
+    uint32 len= ALIGN_SIZE(alloc_length+1);
+    DBUG_ASSERT(len > alloc_length);
+    if (len <= alloc_length)
+      return TRUE;                                 /* Overflow */
     if (alloced)
     {
       if (!(new_ptr= (char*) my_realloc(Ptr,len,MYF(MY_WME))))
@@ -635,10 +638,10 @@ void String::qs_append(int i)
   str_length+= (int) (end-buff);
 }
 
-void String::qs_append(uint i)
+void String::qs_append(ulonglong i)
 {
   char *buff= Ptr + str_length;
-  char *end= int10_to_str(i, buff, 10);
+  char *end= longlong10_to_str(i, buff,10);
   str_length+= (int) (end-buff);
 }
 
@@ -913,6 +916,65 @@ my_copy_with_hex_escaping(CHARSET_INFO *cs,
   return dst - dst0;
 }
 
+/*
+  Optimized for quick copying of ASCII characters in the range 0x00..0x7F.
+*/
+uint32
+copy_and_convert(char *to, uint32 to_length, CHARSET_INFO *to_cs, 
+                 const char *from, uint32 from_length, CHARSET_INFO *from_cs,
+                 uint *errors)
+{
+  /*
+    If any of the character sets is not ASCII compatible,
+    immediately switch to slow mb_wc->wc_mb method.
+  */
+  if ((to_cs->state | from_cs->state) & MY_CS_NONASCII)
+    return copy_and_convert_extended(to, to_length, to_cs,
+                                     from, from_length, from_cs, errors);
+
+  uint32 length= min(to_length, from_length), length2= length;
+
+#if defined(__i386__)
+  /*
+    Special loop for i386, it allows to refer to a
+    non-aligned memory block as UINT32, which makes
+    it possible to copy four bytes at once. This
+    gives about 10% performance improvement comparing
+    to byte-by-byte loop.
+  */
+  for ( ; length >= 4; length-= 4, from+= 4, to+= 4)
+  {
+    if ((*(uint32*)from) & 0x80808080)
+      break;
+    *((uint32*) to)= *((const uint32*) from);
+  }
+#endif
+
+  for (; ; *to++= *from++, length--)
+  {
+    if (!length)
+    {
+      *errors= 0;
+      return length2;
+    }
+    if (*((unsigned char*) from) > 0x7F) /* A non-ASCII character */
+    {
+      uint32 copied_length= length2 - length;
+      to_length-= copied_length;
+      from_length-= copied_length;
+      return copied_length + copy_and_convert_extended(to, to_length,
+                                                       to_cs,
+                                                       from, from_length,
+                                                       from_cs,
+                                                       errors);
+    }
+  }
+
+  DBUG_ASSERT(FALSE); // Should never get to here
+  return 0;           // Make compiler happy
+}
+
+
 /*
   copy a string,
   with optional character set conversion,