function.c

#include "function.h"

unsigned int
ui2s(unsigned int num, char *buff, unsigned int bsize, unsigned int base,
     unsigned int len)
{
	unsigned int	i , j, k, l;
	char		chb      , che;
	if (!base) {
		buff[0] = 0;
		return 0;
	}
	j = num, i = 0;
	do {
		k = j % base;
		j /= base;
		buff[i++] = ((base == 16) && (k > 9)) ? k + 'A' - 10 : k + '0';
	}
	while (j > 0 && i < bsize);

	for (; i < len; i++) {
		buff[i] = '0';
	}

	l = i;
	buff[i] = 0;


	if (i > 0) {
		chb = buff[0];
		che = buff[i - 1];
		for (j = 0, i--; j < i; j++, i--) {
			chb = buff[j];
			che = buff[i];
			buff[j] = che;
			buff[i] = chb;
		}
	}
	return l;
}

int
isUint(const char *ch)
{
	unsigned int	i;
	if (!sLen(ch))
		return 0;
	for (i = 0; ch[i]; i++) {
		if (ch[i] < '0' || ch[i] > '9') {
			return 0;
		}
	}
	return 1;
}

unsigned int
pow2ui(unsigned int base, unsigned int pow)
{
	unsigned int	i , j;
	if (!base)
		return 0;
	if (!pow)
		return 1;
	for (i = 1, j = base; i < pow; i++) {
		j = j * base;
	}
	return j;
}

unsigned int
s2ui(const char *ch, unsigned int base)
{
	unsigned int	i , j, k, l;
	j = 0;
	k = 0;
	i = sLen(ch) - 1;
	do {
		if (base == 16) {
			l =
				(((ch[i] >= 'A'
				   && ch[i] <= 'F') ? (ch[i] - 'A' + 10) : (ch[i] - '0')));

			j += l * pow2ui(base, k++);
		} else {
			j += (ch[i] - '0') * pow2ui(base, k++);
		}
	}
	while (i-- != 0);

	return j;
}

unsigned int
sLen(const char *ch)
{
	unsigned int	i;

	for (i = 0; ch[i]; i++);
	return i;
}

unsigned
isUintHex(const char *ch)
{
	unsigned int	i;
	if (!sLen(ch))
		return 0;
	for (i = 0; ch[i]; i++) {
		if (!((ch[i] >= '0' && ch[i] <= '9') || (ch[i] >= 'A' && ch[i] <= 'F')))
			return 0;
	}
	return 1;
}