C++_直接插入排序（纯C版）

//用于比较大小

int compared(const void *key1,const void *key2)
{
	cout<<"enter compare"<<endl;
	const int* iKey1 = (int*)key1;
	const int* iKey2 = (int*)key2;
	cout<<*iKey1<<endl;
	cout<<*iKey2<<endl;

	if(*iKey1>*iKey2){
		//cout<<"big"<<endl;
		return 1;
	}
	else if(*iKey1==*iKey2){
		//cout<<"equal"<<endl;
		return 0;
	}
	else if(*iKey1<*iKey2)
	{
		//cout<<"less"<<endl;
		return -1;
	}
}

//C版排序执行片段

int issort(void *data, int size,int esize,int (*compare)(const void *key1,const void *key2))
{
	char *a = (char*)data;

	void *key=NULL;
	
	int i=0,j=0;

	if((key=(char *)malloc(esize))==NULL)
	{
		return -1;
	}
	else
	{
		memset(key, 0, esize);
		for(j=1;j<size;j++)
		{
			memcpy(key, &a[j*esize],esize);
			i=j-1;

			while(i>=0&&compare(&a[i*esize],key)>0){
				memcpy(&a[(i+1)*esize],&a[i*esize],esize);
				i--;
				cout<<i<<endl;
			}

			memcpy(&a[(i+1)*esize],key,esize);
			
		}
		free(key);
		return 0;
	}

}