// conv.h
// Author: Josh Holtrop
// Date: 08/02/04

#include "conv.h"
#include "hos_defines.h"

// BCD to string
// returns number of characters generated before null terminator
int	bcdtoa(u32_t bcd, char *buf)
{
	*buf++ = ((bcd & 0xF0) >> 4) + '0';
	*buf++ = (bcd & 0xF) + '0';
	*buf = 0;
	return 2;
}


// convert integer to hexadecimal string
int	itox(u32_t num, char *buf)
{
	int s, i = 0;
	for (s = 28; s >= 0; s -= 4)
	{
		u32_t val = (num >> s) & 0xF;
		if (i || val || (!s))
		{
			val = (val > 9) ? (val + 'A' - 10) : (val + '0');
			buf[i++] = val;
		}
	}
	buf[i] = 0;
	return i - 1;
}


// convert signed integer to decimal string
int	itoa(int num, char *buf)
{
	// 4,294,967,296
	int hitNum = 0, i = 0, mod, val;
	if (num < 0)
	{
		buf[i++] = '-';
		num = -num;
	}
	for (mod = 1000000000; mod >= 1; mod /= 10)
	{
		val = num / mod;
		num %= mod;
		if (val || (mod == 1))
			hitNum = 1;
		if (hitNum)
		{
			buf[i++] = val + '0';
		}
	}
	buf[i] = 0;
	return i - 1;
}


// convert an unsigned integer to decimal string
int	utoa(u32_t num, char *buf)
{
	// 4,294,967,296
	int hitNum = 0, i = 0, mod, val;
	for (mod = 1000000000; mod >= 1; mod /= 10)
	{
		val = num / mod;
		num %= mod;
		if (val || (mod == 1))
			hitNum = 1;
		if (hitNum)
		{
			buf[i++] = val + '0';
		}
	}
	buf[i] = 0;
	return i - 1;
}


char	asciiSwitchCase(char chr)
{
	if (chr >= 'A' && chr <= 'Z')
		return chr + ('a' - 'A');
	if (chr >= 'a' && chr <= 'z')
		return chr - ('a' - 'A');
	return chr;
}