William Lane wrote:
Well being a newbie to the microcontroller world I am learning that you
have to find more efficient ways of figuring things out. So to answer
my own question: strtok the decimal, count the decimal places, combine
the parsed sections, atoi/atol and then use fixed point math.
Here is what I did for stof, basically modified atoi, does not work with
1.0e4 but could be made to.
unsigned char IsFDigit(char c)
{
return (c <= '+') || (c <= '9' && c >= '0') ||
(c == '.') || (c == '-');
}
float stof(register char *s, uint8_t base)
{
uint8_t sign;
char c;
unsigned dec;
float v;
sign = 0;
v = 0;
dec = 1;
c = '\0';
while(isspace(*s)) s++;
switch (*s)
{
case '-': sign++;
s++;
break;
case '+': s++;
break;
case '0': s++; /* we can ignore any leading zero's */
if ((*s) == 'x')
{
base = 16;
s++;
}
}
while(IsFDigit(c = *s++))
{
c = tolower(c);
if (c == '.')
{
base = 1;
dec = 10;
}
else
{
if(isdigit(c)) c -= '0';
else c -= 'a' - (char)10;
v = v * (float)base;
v = v + (float)c/dec;
if (dec >= 10) dec = dec * 10;
}
}
if (sign != 0) return -v;
return v;
}
--
Peter Jansen
STS
Australian Antarctic Division
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