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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; 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= (uint) 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=0;
DBUG_ENTER("dynstr_set");
if (init_str && (length= (uint) 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)
{
return dynstr_append_mem(str,append,(uint) strlen(append));
}
my_bool dynstr_append_mem(DYNAMIC_STRING *str, const char *append,
uint length)
{
char *new_ptr;
if (str->length+length >= str->max_length)
{
uint new_length=(str->length+length+str->alloc_increment)/
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;
str->str[str->length]=0; /* Safety for C programs */
return FALSE;
}
my_bool dynstr_trunc(DYNAMIC_STRING *str, int n)
{
str->length-=n;
str->str[str->length]= '\0';
return FALSE;
}
void dynstr_free(DYNAMIC_STRING *str)
{
if (str->str)
{
my_free(str->str,MYF(MY_WME));
str->str=0;
}
}
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