1 files changed, 50 insertions, 0 deletions
diff --git a/strings/bcopy-duff.c b/strings/bcopy-duff.c
new file mode 100644
index 00000000000..2f5a709c3a0
--- /dev/null
+++ b/strings/bcopy-duff.c
@@ -0,0 +1,50 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+#define IFACTOR 4
+
+  void
+dcopy(char *chardest, char *charsrc, int size)
+{
+  register int *src, *dest, intcount ;
+  int startcharcpy, intoffset, numints2cpy, i ;
+
+  numints2cpy = size >> 2 ;
+  startcharcpy = numints2cpy << 2 ;
+  intcount = numints2cpy & ~(IFACTOR-1) ;
+  intoffset = numints2cpy - intcount ;
+
+  src = (int *)(((int) charsrc) + intcount*sizeof(int*)) ;
+  dest = (int *)(((int) chardest) + intcount*sizeof(int*)) ;
+
+  /* copy the ints */
+  switch(intoffset)
+    do
+    {
+    case 0: dest[3] = src[3] ;
+    case 3: dest[2] = src[2] ;
+    case 2: dest[1] = src[1] ;
+    case 1: dest[0] = src[0] ;
+      intcount -= IFACTOR ;
+      dest -= IFACTOR ;
+      src -= IFACTOR ;
+    } while (intcount >= 0) ;
+
+  /* copy the chars left over by the int copy at the end */
+  for(i=startcharcpy ; i<size ; i++)
+    chardest[i] = charsrc[i] ;
+}