src/malloc/malloc_usable_size.c


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/**
 * slibc — Yet another C library
 * Copyright © 2015, 2016  Mattias Andrée (m@maandree.se)
 * 
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * 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, see <http://www.gnu.org/licenses/>.
 */
#include <stdlib.h>
#include <slibc-alloc.h>


/**
 * This function returns the allocation size of
 * a memory segment.
 * 
 * `p = malloc(n), malloc_usable_size(p)` will return `n`.
 * 
 * @etymology  (`malloc`)-subsystem: user-(usable size) of allocation.
 * 
 * @param   segment  The memory segment.
 * @return           The size of the memory segment, 0 if `segment` is `NULL`.
 * 
 * @since  Always.
 */
size_t malloc_usable_size(void* segment)
{
  return allocsize(segment);  
}