Dept of second thoughts: don't use the new wide-character upper/lower

code if we are running in a single-byte encoding.  No point in the
extra overhead in that case.

diff --git a/src/backend/utils/adt/oracle_compat.c b/src/backend/utils/adt/oracle_compat.c
index ddbe890..18a0e9e 100644 (file)
--- a/src/backend/utils/adt/oracle_compat.c
+++ b/src/backend/utils/adt/oracle_compat.c
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *     $PostgreSQL: pgsql/src/backend/utils/adt/oracle_compat.c,v 1.52 2004/05/26 16:16:03 tgl Exp $
+ *     $PostgreSQL: pgsql/src/backend/utils/adt/oracle_compat.c,v 1.53 2004/06/06 22:17:01 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -166,40 +166,44 @@ Datum
 lower(PG_FUNCTION_ARGS)
 {
 #ifdef USE_WIDE_UPPER_LOWER
-       text       *string = PG_GETARG_TEXT_P(0);
-       text       *result;
-       wchar_t    *workspace;
-       int                     i;
-
-       workspace = texttowcs(string);
+       /* use wide char code only when max encoding length > one */
+       if (pg_database_encoding_max_length() > 1)
+       {
+               text       *string = PG_GETARG_TEXT_P(0);
+               text       *result;
+               wchar_t    *workspace;
+               int                     i;
 
-       for (i = 0; workspace[i] != 0; i++)
-               workspace[i] = towlower(workspace[i]);
+               workspace = texttowcs(string);
 
-       result = wcstotext(workspace, i);
+               for (i = 0; workspace[i] != 0; i++)
+                       workspace[i] = towlower(workspace[i]);
 
-       pfree(workspace);
+               result = wcstotext(workspace, i);
 
-       PG_RETURN_TEXT_P(result);
+               pfree(workspace);
 
-#else /* !USE_WIDE_UPPER_LOWER */
+               PG_RETURN_TEXT_P(result);
+       }
+       else
+#endif /* USE_WIDE_UPPER_LOWER */
+       {
+               text       *string = PG_GETARG_TEXT_P_COPY(0);
+               char       *ptr;
+               int                     m;
 
-       text       *string = PG_GETARG_TEXT_P_COPY(0);
-       char       *ptr;
-       int                     m;
+               /* Since we copied the string, we can scribble directly on the value */
+               ptr = VARDATA(string);
+               m = VARSIZE(string) - VARHDRSZ;
 
-       /* Since we copied the string, we can scribble directly on the value */
-       ptr = VARDATA(string);
-       m = VARSIZE(string) - VARHDRSZ;
+               while (m-- > 0)
+               {
+                       *ptr = tolower((unsigned char) *ptr);
+                       ptr++;
+               }
 
-       while (m-- > 0)
-       {
-               *ptr = tolower((unsigned char) *ptr);
-               ptr++;
+               PG_RETURN_TEXT_P(string);
        }
-
-       PG_RETURN_TEXT_P(string);
-#endif /* USE_WIDE_UPPER_LOWER */
 }
 
 
@@ -221,40 +225,44 @@ Datum
 upper(PG_FUNCTION_ARGS)
 {
 #ifdef USE_WIDE_UPPER_LOWER
-       text       *string = PG_GETARG_TEXT_P(0);
-       text       *result;
-       wchar_t    *workspace;
-       int                     i;
-
-       workspace = texttowcs(string);
+       /* use wide char code only when max encoding length > one */
+       if (pg_database_encoding_max_length() > 1)
+       {
+               text       *string = PG_GETARG_TEXT_P(0);
+               text       *result;
+               wchar_t    *workspace;
+               int                     i;
 
-       for (i = 0; workspace[i] != 0; i++)
-               workspace[i] = towupper(workspace[i]);
+               workspace = texttowcs(string);
 
-       result = wcstotext(workspace, i);
+               for (i = 0; workspace[i] != 0; i++)
+                       workspace[i] = towupper(workspace[i]);
 
-       pfree(workspace);
+               result = wcstotext(workspace, i);
 
-       PG_RETURN_TEXT_P(result);
+               pfree(workspace);
 
-#else /* !USE_WIDE_UPPER_LOWER */
+               PG_RETURN_TEXT_P(result);
+       }
+       else
+#endif /* USE_WIDE_UPPER_LOWER */
+       {
+               text       *string = PG_GETARG_TEXT_P_COPY(0);
+               char       *ptr;
+               int                     m;
 
-       text       *string = PG_GETARG_TEXT_P_COPY(0);
-       char       *ptr;
-       int                     m;
+               /* Since we copied the string, we can scribble directly on the value */
+               ptr = VARDATA(string);
+               m = VARSIZE(string) - VARHDRSZ;
 
-       /* Since we copied the string, we can scribble directly on the value */
-       ptr = VARDATA(string);
-       m = VARSIZE(string) - VARHDRSZ;
+               while (m-- > 0)
+               {
+                       *ptr = toupper((unsigned char) *ptr);
+                       ptr++;
+               }
 
-       while (m-- > 0)
-       {
-               *ptr = toupper((unsigned char) *ptr);
-               ptr++;
+               PG_RETURN_TEXT_P(string);
        }
-
-       PG_RETURN_TEXT_P(string);
-#endif /* USE_WIDE_UPPER_LOWER */
 }
 
 
@@ -279,58 +287,56 @@ Datum
 initcap(PG_FUNCTION_ARGS)
 {
 #ifdef USE_WIDE_UPPER_LOWER
-       text       *string = PG_GETARG_TEXT_P(0);
-       text       *result;
-       wchar_t    *workspace;
-       int                     wasalnum = 0;
-       int                     i;
-
-       workspace = texttowcs(string);
-
-       for (i = 0; workspace[i] != 0; i++)
+       /* use wide char code only when max encoding length > one */
+       if (pg_database_encoding_max_length() > 1)
        {
-               if (wasalnum)
-                       workspace[i] = towlower(workspace[i]);
-               else
-                       workspace[i] = towupper(workspace[i]);
-               wasalnum = iswalnum(workspace[i]);
-       }
+               text       *string = PG_GETARG_TEXT_P(0);
+               text       *result;
+               wchar_t    *workspace;
+               int                     wasalnum = 0;
+               int                     i;
 
-       result = wcstotext(workspace, i);
+               workspace = texttowcs(string);
 
-       pfree(workspace);
+               for (i = 0; workspace[i] != 0; i++)
+               {
+                       if (wasalnum)
+                               workspace[i] = towlower(workspace[i]);
+                       else
+                               workspace[i] = towupper(workspace[i]);
+                       wasalnum = iswalnum(workspace[i]);
+               }
 
-       PG_RETURN_TEXT_P(result);
+               result = wcstotext(workspace, i);
 
-#else /* !USE_WIDE_UPPER_LOWER */
+               pfree(workspace);
 
-       text       *string = PG_GETARG_TEXT_P_COPY(0);
-       char       *ptr;
-       int                     m;
+               PG_RETURN_TEXT_P(result);
+       }
+       else
+#endif /* USE_WIDE_UPPER_LOWER */
+       {
+               text       *string = PG_GETARG_TEXT_P_COPY(0);
+               int                     wasalnum = 0;
+               char       *ptr;
+               int                     m;
 
-       /* Since we copied the string, we can scribble directly on the value */
-       ptr = VARDATA(string);
-       m = VARSIZE(string) - VARHDRSZ;
+               /* Since we copied the string, we can scribble directly on the value */
+               ptr = VARDATA(string);
+               m = VARSIZE(string) - VARHDRSZ;
 
-       if (m > 0)
-       {
-               *ptr = toupper((unsigned char) *ptr);
-               ptr++;
-               m--;
-       }
+               while (m-- > 0)
+               {
+                       if (wasalnum)
+                               *ptr = tolower((unsigned char) *ptr);
+                       else
+                               *ptr = toupper((unsigned char) *ptr);
+                       wasalnum = isalnum((unsigned char) *ptr);
+                       ptr++;
+               }
 
-       while (m-- > 0)
-       {
-               /* Oracle capitalizes after all non-alphanumeric */
-               if (!isalnum((unsigned char) ptr[-1]))
-                       *ptr = toupper((unsigned char) *ptr);
-               else
-                       *ptr = tolower((unsigned char) *ptr);
-               ptr++;
+               PG_RETURN_TEXT_P(string);
        }
-
-       PG_RETURN_TEXT_P(string);
-#endif /* USE_WIDE_UPPER_LOWER */
 }