std::string ToLeximitedHeader(u32 len)
{
std::ostringstream os;
if (len < 9)
os << len;
else
os << 9 << ToLeximitedHeader(DigitCount(len,10)) << len;
return os.str();
}
std::string ToLeximitedNumber(u32 num)
{
//returns 10 when 'num' is zero
u32 digits = (num == 0 ? 1 : DigitCount(num, 10));
std::ostringstream os;
os << ToLeximitedHeader(digits) << num;
return os.str();
} //ToLeximitedNumber (unsigned)
void
IntToCharArray(int64 *Input, char *Output)
{
int64 tmp = *Input;
char *NumCharPointer = Output + DigitCount(&tmp) - 1;
while (tmp != 0)
{
*NumCharPointer-- = '0' + (tmp % 10);
tmp = (tmp - *NumCharPointer) / 10;
}
}
std::string ToLeximitedNumber(s32 num)
{
//handles negative numbers
//returns 'n' before a negative num, e.g., -3 -> n13
//returns '10' when 'num' is zero
//returns 'n10' when 'num' is the biggest negative number
bool useneg = false;
u32 digits;
if(num == 0)
digits = 1;
else if(num < 0)
{
// use 'n10' as a special code meaning 'max negative number'
if (num == S32_MIN)
{
num = 0;
digits = 1;
}
else
{
num = -num;
digits = DigitCount((u32) num, 10);
}
useneg = true;
}
else //>0
{
digits = DigitCount((u32) num, 10);
}
std::ostringstream os;
if(useneg)
os << "n";
os << ToLeximitedHeader(digits) << num;
return os.str();
} //ToLeximitedNumber (signed)
void IntLexEncode(u32 num, char* output)
{
u32 digits = DigitCount(num, 26);
output[digits] = 0;
/* Off by one case for the lazy*/
if(!num)
{
output[0] = 'a';
output[1] = 0;
}
else
{
while(num)
{
output[--digits] = 'a' + num % 26;
num /= 26;
}
}
}
#include <ionCore.h>
#include <catch.hpp>
TEST_CASE("ionUtils::DigitCount", "")
{
CHECK(DigitCount(0) == 1);
CHECK(DigitCount(1) == 1);
CHECK(DigitCount(5) == 1);
CHECK(DigitCount(9) == 1);
CHECK(DigitCount(10) == 2);
CHECK(DigitCount(11) == 2);
CHECK(DigitCount(19) == 2);
CHECK(DigitCount(20) == 2);
CHECK(DigitCount(99) == 2);
CHECK(DigitCount(100) == 3);
CHECK(DigitCount(101) == 3);
CHECK(DigitCount(1000) == 4);
CHECK(DigitCount(1001) == 4);
CHECK(DigitCount(9999) == 4);
CHECK(DigitCount(10000) == 5);
CHECK(DigitCount(10001) == 5);
CHECK(DigitCount(34802) == 5);
CHECK(DigitCount(2147483647) == 10);
CHECK(DigitCount(-0) == 1);
CHECK(DigitCount(-1) == 2);
CHECK(DigitCount(-9) == 2);
CHECK(DigitCount(-10) == 3);
CHECK(DigitCount(-11) == 3);
