Import changeset

1 files changed, 117 insertions, 0 deletions

diff --git a/mysys/string.c b/mysys/string.c
new file mode 100644
index 00000000000..f7e265a43e6
--- /dev/null
+++ b/mysys/string.c
@@ -0,0 +1,117 @@
+/* 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 */
+
+/*
+  Code for handling strings with can grow dynamicly.
+  Copyright Monty Program KB.
+  By monty.
+*/
+
+#include "mysys_priv.h"
+#include <m_string.h>
+
+my_bool init_dynamic_string(DYNAMIC_STRING *str, const char *init_str,
+			    uint init_alloc, uint alloc_increment)
+{
+  uint length;
+  DBUG_ENTER("init_dynamic_string");
+
+  if (!alloc_increment)
+    alloc_increment=128;
+  length=1;
+  if (init_str && (length=strlen(init_str)+1) < init_alloc)
+    init_alloc=((length+alloc_increment-1)/alloc_increment)*alloc_increment;
+  if (!init_alloc)
+    init_alloc=alloc_increment;
+
+  if (!(str->str=(char*) my_malloc(init_alloc,MYF(MY_WME))))
+    DBUG_RETURN(TRUE);
+  str->length=length-1;
+  if (init_str)
+    memcpy(str->str,init_str,length);
+  str->max_length=init_alloc;
+  str->alloc_increment=alloc_increment;
+  DBUG_RETURN(FALSE);
+}
+
+my_bool dynstr_set(DYNAMIC_STRING *str, const char *init_str)
+{
+  uint length;
+  DBUG_ENTER("dynstr_set");
+
+  if (init_str && (length=strlen(init_str)+1) > str->max_length)
+  {
+    str->max_length=((length+str->alloc_increment-1)/str->alloc_increment)*
+      str->alloc_increment;
+    if (!str->max_length)
+      str->max_length=str->alloc_increment;
+    if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME))))
+      DBUG_RETURN(TRUE);
+  }
+  if (init_str)
+  {
+    str->length=length-1;
+    memcpy(str->str,init_str,length);
+  }
+  else
+    str->length=0;
+  DBUG_RETURN(FALSE);
+}
+
+my_bool dynstr_realloc(DYNAMIC_STRING *str, ulong additional_size)
+{
+  DBUG_ENTER("dynstr_realloc");
+
+  if (!additional_size) DBUG_RETURN(FALSE);
+  if (str->length + additional_size > str->max_length)
+  {
+    str->max_length=((str->length + additional_size+str->alloc_increment-1)/
+		     str->alloc_increment)*str->alloc_increment;
+    if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME))))
+      DBUG_RETURN(TRUE);
+  }
+  DBUG_RETURN(FALSE);
+}
+
+
+my_bool dynstr_append(DYNAMIC_STRING *str, const char *append)
+{
+  char *new_ptr;
+  uint length=(uint) strlen(append)+1;
+  if (str->length+length > str->max_length)
+  {
+    uint new_length=(str->length+length+str->alloc_increment-1)/
+      str->alloc_increment;
+    new_length*=str->alloc_increment;
+    if (!(new_ptr=(char*) my_realloc(str->str,new_length,MYF(MY_WME))))
+      return TRUE;
+    str->str=new_ptr;
+    str->max_length=new_length;
+  }
+  memcpy(str->str + str->length,append,length);
+  str->length+=length-1;
+  return FALSE;
+}
+
+void dynstr_free(DYNAMIC_STRING *str)
+{
+  if (str->str)
+  {
+    my_free(str->str,MYF(MY_WME));
+    str->str=0;
+  }
+}