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127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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Code for handling strings with can grow dynamicly.
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Copyright Monty Program KB.
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By monty.
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*/
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#include "mysys_priv.h"
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#include <m_string.h>
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my_bool init_dynamic_string(DYNAMIC_STRING *str, const char *init_str,
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uint init_alloc, uint alloc_increment)
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{
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uint length;
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DBUG_ENTER("init_dynamic_string");
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if (!alloc_increment)
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alloc_increment=128;
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length=1;
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if (init_str && (length= (uint) strlen(init_str)+1) < init_alloc)
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init_alloc=((length+alloc_increment-1)/alloc_increment)*alloc_increment;
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if (!init_alloc)
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init_alloc=alloc_increment;
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if (!(str->str=(char*) my_malloc(init_alloc,MYF(MY_WME))))
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DBUG_RETURN(TRUE);
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str->length=length-1;
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if (init_str)
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memcpy(str->str,init_str,length);
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str->max_length=init_alloc;
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str->alloc_increment=alloc_increment;
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DBUG_RETURN(FALSE);
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}
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my_bool dynstr_set(DYNAMIC_STRING *str, const char *init_str)
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{
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uint length=0;
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DBUG_ENTER("dynstr_set");
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if (init_str && (length= (uint) strlen(init_str)+1) > str->max_length)
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{
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str->max_length=((length+str->alloc_increment-1)/str->alloc_increment)*
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str->alloc_increment;
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if (!str->max_length)
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str->max_length=str->alloc_increment;
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if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME))))
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DBUG_RETURN(TRUE);
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}
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if (init_str)
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{
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str->length=length-1;
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memcpy(str->str,init_str,length);
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}
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else
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str->length=0;
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DBUG_RETURN(FALSE);
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}
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my_bool dynstr_realloc(DYNAMIC_STRING *str, ulong additional_size)
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{
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DBUG_ENTER("dynstr_realloc");
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if (!additional_size) DBUG_RETURN(FALSE);
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if (str->length + additional_size > str->max_length)
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{
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str->max_length=((str->length + additional_size+str->alloc_increment-1)/
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str->alloc_increment)*str->alloc_increment;
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if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME))))
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DBUG_RETURN(TRUE);
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}
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DBUG_RETURN(FALSE);
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}
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my_bool dynstr_append(DYNAMIC_STRING *str, const char *append)
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{
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return dynstr_append_mem(str,append,strlen(append));
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}
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my_bool dynstr_append_mem(DYNAMIC_STRING *str, const char *append,
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uint length)
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{
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char *new_ptr;
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if (str->length+length >= str->max_length)
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{
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uint new_length=(str->length+length+str->alloc_increment)/
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str->alloc_increment;
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new_length*=str->alloc_increment;
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if (!(new_ptr=(char*) my_realloc(str->str,new_length,MYF(MY_WME))))
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return TRUE;
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str->str=new_ptr;
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str->max_length=new_length;
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}
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memcpy(str->str + str->length,append,length);
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str->length+=length;
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str->str[str->length]=0; /* Safety for C programs */
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return FALSE;
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}
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void dynstr_free(DYNAMIC_STRING *str)
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{
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if (str->str)
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{
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my_free(str->str,MYF(MY_WME));
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str->str=0;
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}
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}
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