unsigned long long strtoull(FAR const char *nptr, FAR char **endptr, int base)
{
unsigned long long accum = 0;
int value;
if (nptr)
{
/* Skip leading spaces */
lib_skipspace(&nptr);
/* Check for unspecified base */
base = lib_checkbase(base, &nptr);
/* Accumulate each "digit" */
while (lib_isbasedigit(*nptr, base, &value))
{
accum = accum*base + value;
nptr++;
}
/* Return the final pointer to the unused value */
if (endptr)
{
*endptr = (char *)nptr;
}
}
return accum;
}
unsigned long long strtoull(const char *nptr, char **endptr, int base)
{
unsigned long long prev, accum = 0;
int value;
if (nptr) {
/* Skip leading spaces */
lib_skipspace(&nptr);
/* Check for unspecified base */
base = lib_checkbase(base, &nptr);
if (base < 0) {
set_errno(EINVAL);
return 0;
}
/* Accumulate each "digit" */
while (lib_isbasedigit(*nptr, base, &value)) {
prev = accum;
accum = accum * base + value;
nptr++;
/* Check for overflow */
if (accum < prev) {
set_errno(ERANGE);
accum = 0;
break;
}
}
/* Return the final pointer to the unused value */
if (endptr) {
*endptr = (char *)nptr;
}
}
return accum;
}
long long strtoll(const char *nptr, char **endptr, int base)
{
unsigned long long accum = 0;
bool negate = false;
if (nptr)
{
/* Skip leading spaces */
lib_skipspace(&nptr);
/* Check for leading + or - */
if (*nptr == '-')
{
negate = true;
nptr++;
}
else if (*nptr == '+')
{
nptr++;
}
/* Get the unsigned value */
accum = strtoull(nptr, endptr, base);
/* Correct the sign of the result */
if (negate)
{
return -(long long)accum;
}
}
return (long long)accum;
}
