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Author: Pericles001

0x0C-more_malloc_free/100-realloc.c

@@ -0,0 +1,44 @@
+#include "main.h"
+
+
+/**
+* _realloc - reallocates a memory block
+* @ptr: pointer to the memory previously allocated with a call to malloc
+* @old_size: size of ptr
+* @new_size: size of the new memory to be allocated
+*
+* Return: pointer to the address of the new memory block
+*/
+
+void *_realloc(void *ptr, unsigned int old_size, unsigned int new_size)
+{
+	void *temp_block;
+	unsigned int i;
+
+	if (ptr == NULL)
+	{
+		temp_block = malloc(new_size);
+		return (temp_block);
+	}
+	else if (new_size == old_size)
+		return (ptr);
+
+	else if (new_size == 0 && ptr != NULL)
+	{
+		free(ptr);
+		return (NULL);
+	}
+	else
+	{
+		temp_block = malloc(new_size);
+		if (temp_block != NULL)
+		{
+			for (i = 0; i < min(old_size, new_size); i++)
+				*((char *)temp_block + i) = *((char *) ptr + i);
+			free(ptr);
+			return (temp_block);
+		}
+		else
+			return (NULL);
+	}
+}