Okay, here's one that is MUCH faster which I did after reading Weston's
(better) code. It's still not quite as fast as the sprintf() version,
but much closer (about 25% slower instead of twice as slow).
int pow10i( unsigned int p )
{
int ret = 1;
while(p--)
ret *= 10;
return ret;
}
void itoa( int value, char *buf )
{
if( value == 0 )
{
buf[0] = '0';
buf[1] = '\0';
}
else
{
int i = value;
if( value < 0 )
{
buf[0] = '-';
i = -i;
}
int len = (int)log10( i ) + 1;
for( int pos=len-1; pos>=0; pos-- )
{
int digit = i % 10;
int index = value < 0 ? pos+1 : pos;
buf[index] = '0' + digit;
i /= 10;
}
int index = value < 0 ? len+1 : len;
buf[index] = '\0';
}
}
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