#include "list.h"

#include <string.h>

#include "util.h"

#include "logging.h"

void *flib_list_insert(void *list, int *listSizePtr, size_t elementSize, void *elementPtr, int pos) {

	void *result = NULL;

	if(!listSizePtr || !elementPtr || pos < 0 || pos > *listSizePtr) {

		flib_log_e("Invalid parameter in flib_list_insert");

	} else {

		unsigned char *newList = flib_realloc(list, ((*listSizePtr)+1)*elementSize);

		if(newList) {

			memmove(newList + (pos+1)*elementSize, newList + pos*elementSize, ((*listSizePtr)-pos)*elementSize);

			memmove(newList + pos*elementSize, elementPtr, elementSize);

			(*listSizePtr)++;

			result = newList;

		}

	}

	return result;

}

void *flib_list_delete(void *list, int *listSizePtr, size_t elementSize, int pos) {

	void *result = NULL;

	if(!listSizePtr || pos < 0 || pos >= *listSizePtr) {

		flib_log_e("Invalid parameter in flib_list_delete");

	} else {

		unsigned char *charList = list;

		memmove(charList + (pos*elementSize), charList + (pos+1)*elementSize, (*listSizePtr-(pos+1))*elementSize);

		(*listSizePtr)--;

		// If the realloc fails, just keep using the old buffer...

		size_t newCharSize = (*listSizePtr)*elementSize;

		void *newList = flib_realloc(list, newCharSize);

		if(newList || newCharSize==0) {

			result = newList;

		} else {

			result = list;

		}

	}

	return result;

}