memory.c

#include "holberton.h"
/**
  *_realloc -  reallocates a memory block
  *@ptr: is a pointer to the memory previously allocated
  *@old_size: is the size, in bytes, of the allocated space for ptr
  *@new_size: is the new size, in bytes of the new memory block
  *
  * Return: pointer to the new allocation with the values from prev
 */
void *_realloc(void *ptr, unsigned int old_size, unsigned int new_size)
{
	char *p, *ptr1 = ptr;
	unsigned int iterator = 0;

	if (new_size == old_size)
		return (ptr);
	if (new_size == 0 && ptr != NULL)
	{
		free(ptr);
		return (NULL);
	}
	p = malloc(new_size);
	if (p == NULL)
	{
		free(ptr);
		return (NULL);
	}
	while (iterator < new_size - 1)
	{
		p[iterator] = ptr1[iterator];
		iterator++;
	}
	free(ptr);
	return (p);
}
/**
  *realloc_pointer -  reallocates a memory block
  *@ptr: is a pointer to the memory previously allocated
  *@old_size: is the size, in bytes, of the allocated space for ptr
  *@new_size: is the new size, in bytes of the new memory block
  *Return: pointer to the new allocation with the values from prev
 */
void *realloc_pointer(void *ptr, unsigned int old_size, unsigned int new_size)
{
	char **p, **ptr1 = ptr;
	unsigned int iterator = 0;

	if (new_size == old_size)
		return (ptr);
	if (new_size == 0 && ptr != NULL)
	{
		free(ptr);
		return (NULL);
	}
	p = malloc(new_size * sizeof(char *));
	if (p == NULL)
	{
		free(ptr);
		return (NULL);
	}
	while (iterator < new_size - 1)
	{
		p[iterator] = ptr1[iterator];
		iterator++;
	}
	free(ptr);
	return (p);
}