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-rw-r--r--mysql/libmariadb/ma_array.c172
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+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+ 2016 MariaDB Corporation 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., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02111-1301, USA */
+
+/* Handling of arrays that can grow dynamicly. */
+
+#undef SAFEMALLOC /* Problems with threads */
+
+#include <ma_global.h>
+#include <ma_sys.h>
+#include "ma_string.h"
+#include <memory.h>
+
+/*
+ Initiate array and alloc space for init_alloc elements. Array is usable
+ even if space allocation failed
+*/
+
+my_bool ma_init_dynamic_array(DYNAMIC_ARRAY *array, uint element_size,
+ uint init_alloc, uint alloc_increment CALLER_INFO_PROTO)
+{
+ if (!alloc_increment)
+ {
+ alloc_increment=max((8192-MALLOC_OVERHEAD)/element_size,16);
+ if (init_alloc > 8 && alloc_increment > init_alloc * 2)
+ alloc_increment=init_alloc*2;
+ }
+
+ if (!init_alloc)
+ init_alloc=alloc_increment;
+ array->elements=0;
+ array->max_element=init_alloc;
+ array->alloc_increment=alloc_increment;
+ array->size_of_element=element_size;
+ if (!(array->buffer=(char*) malloc(element_size*init_alloc)))
+ {
+ array->max_element=0;
+ return(TRUE);
+ }
+ return(FALSE);
+}
+
+
+my_bool ma_insert_dynamic(DYNAMIC_ARRAY *array, void *element)
+{
+ void *buffer;
+ if (array->elements == array->max_element)
+ { /* Call only when nessesary */
+ if (!(buffer=ma_alloc_dynamic(array)))
+ return TRUE;
+ }
+ else
+ {
+ buffer=array->buffer+(array->elements * array->size_of_element);
+ array->elements++;
+ }
+ memcpy(buffer,element,(size_t) array->size_of_element);
+ return FALSE;
+}
+
+
+ /* Alloc room for one element */
+
+unsigned char *ma_alloc_dynamic(DYNAMIC_ARRAY *array)
+{
+ if (array->elements == array->max_element)
+ {
+ char *new_ptr;
+ if (!(new_ptr=(char*) realloc(array->buffer,(array->max_element+
+ array->alloc_increment)*
+ array->size_of_element)))
+ return 0;
+ array->buffer=new_ptr;
+ array->max_element+=array->alloc_increment;
+ }
+ return (unsigned char *)array->buffer+(array->elements++ * array->size_of_element);
+}
+
+
+ /* remove last element from array and return it */
+
+unsigned char *ma_pop_dynamic(DYNAMIC_ARRAY *array)
+{
+ if (array->elements)
+ return (unsigned char *)array->buffer+(--array->elements * array->size_of_element);
+ return 0;
+}
+
+
+my_bool ma_set_dynamic(DYNAMIC_ARRAY *array, void * element, uint idx)
+{
+ if (idx >= array->elements)
+ {
+ if (idx >= array->max_element)
+ {
+ uint size;
+ char *new_ptr;
+ size=(idx+array->alloc_increment)/array->alloc_increment;
+ size*= array->alloc_increment;
+ if (!(new_ptr=(char*) realloc(array->buffer,size*
+ array->size_of_element)))
+ return TRUE;
+ array->buffer=new_ptr;
+ array->max_element=size;
+ }
+ memset((array->buffer+array->elements*array->size_of_element), 0,
+ (idx - array->elements)*array->size_of_element);
+ array->elements=idx+1;
+ }
+ memcpy(array->buffer+(idx * array->size_of_element),element,
+ (size_t) array->size_of_element);
+ return FALSE;
+}
+
+
+void ma_get_dynamic(DYNAMIC_ARRAY *array, void * element, uint idx)
+{
+ if (idx >= array->elements)
+ {
+ memset(element, 0, array->size_of_element);
+ return;
+ }
+ memcpy(element,array->buffer+idx*array->size_of_element,
+ (size_t) array->size_of_element);
+}
+
+
+void ma_delete_dynamic(DYNAMIC_ARRAY *array)
+{
+ if (array->buffer)
+ {
+ free(array->buffer);
+ array->buffer=0;
+ array->elements=array->max_element=0;
+ }
+}
+
+
+void ma_delete_dynamic_element(DYNAMIC_ARRAY *array, uint idx)
+{
+ char *ptr=array->buffer+array->size_of_element*idx;
+ array->elements--;
+ memmove(ptr,ptr+array->size_of_element,
+ (array->elements-idx)*array->size_of_element);
+}
+
+
+void ma_freeze_size(DYNAMIC_ARRAY *array)
+{
+ uint elements=max(array->elements,1);
+
+ if (array->buffer && array->max_element != elements)
+ {
+ array->buffer=(char*) realloc(array->buffer,
+ elements*array->size_of_element);
+ array->max_element=elements;
+ }
+}