#include <string.h>

void ltoa(char *buf, unsigned long i, int base)
	{
	char *s;
#define LEN	25
	int rem;
	char rev[LEN+1];

	if (i == 0)
		s = "0";
	else
		{
		rev[LEN] = 0;
		s = &rev[LEN];
		while (i)
			{
			rem = i % base;
			if (rem < 10)
				*--s = rem + '0';
			else if (base == 16)
				*--s = "abcdef"[rem - 10];
			i /= base;
			}
		}
	strcpy(buf, s);
	}