baseconv.c

/*
 * From http://c-faq.com/misc/hexio.html
 * modified for padding zeros - ruda
 */

#define NULL 0

char *
baseconv(unsigned int num, int base)
{
	static char retbuf[8+1];
	char *p;

	if(base < 2 || base > 16)
		return NULL;

	p = &retbuf[sizeof(retbuf)-1];
	*p = '\0';

	do {
		*--p = "0123456789abcdef"[num % base];
		num /= base;
	} while(num != 0);

	while (p != retbuf)
		*--p = '0';

	return p;
}