uintmax_t strntoumax(const char * nptr, char ** endptr, int base, size_t n)
{
const unsigned char * p = (const unsigned char *) nptr;
const unsigned char * end = p + n;
int minus = 0;
uintmax_t v = 0;
int d;
/* skip leading space */
while (p < end && isspace(*p))
p++;
/* Single optional + or - */
if (p < end)
{
char c = p[0];
if (c == '-' || c == '+')
{
minus = (c == '-');
p++;
}
}
if (base == 0)
{
if (p + 2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X'))
{
p += 2;
base = 16;
}
else if (p + 1 < end && p[0] == '0')
{
p += 1;
base = 8;
}
else
{
base = 10;
}
}
else if (base == 16)
{
if (p + 2 < end && p[0] == '0' && (p[1] == 'x' || p[1] == 'X'))
{
p += 2;
}
}
while (p < end && (d = digitval(*p)) >= 0 && d < base)
{
v = v * base + d;
p += 1;
}
if (endptr)
*endptr = (char *) p;
return minus ? -v : v;
}
uintmax_t strntoumax(const char *nptr, char **endptr, int base, size_t n)
{
int minus = 0;
uintmax_t v = 0;
int d;
while (n && isspace((unsigned char)*nptr)) {
nptr++;
n--;
}
/* Single optional + or - */
if (n) {
char c = *nptr;
if (c == '-' || c == '+') {
minus = (c == '-');
nptr++;
n--;
}
}
if (base == 0) {
if (n >= 2 && nptr[0] == '0' &&
(nptr[1] == 'x' || nptr[1] == 'X')) {
n -= 2;
nptr += 2;
base = 16;
} else if (n >= 1 && nptr[0] == '0') {
n--;
nptr++;
base = 8;
} else {
base = 10;
}
} else if (base == 16) {
if (n >= 2 && nptr[0] == '0' &&
(nptr[1] == 'x' || nptr[1] == 'X')) {
n -= 2;
nptr += 2;
}
}
while (n && (d = digitval(*nptr)) >= 0 && d < base) {
v = v * base + d;
n--;
nptr++;
}
if (endptr)
*endptr = (char *)nptr;
return minus ? -v : v;
}
unsigned long strtoul(const char *nptr, char **endptr, int base)
{
int minus = 0;
unsigned long v = 0;
int d;
while (isspace((unsigned char)*nptr)) {
nptr++;
}
/* Single optional + or - */
{
char c = *nptr;
if (c == '-' || c == '+') {
minus = (c == '-');
nptr++;
}
}
if (base == 0) {
if (nptr[0] == '0' && (nptr[1] == 'x' || nptr[1] == 'X')) {
nptr += 2;
base = 16;
} else if (nptr[0] == '0') {
nptr++;
base = 8;
} else {
base = 10;
}
} else if (base == 16) {
if (nptr[0] == '0' && (nptr[1] == 'x' || nptr[1] == 'X')) {
nptr += 2;
}
}
while ((d = digitval(*nptr)) >= 0 && d < base) {
v = v * base + d;
nptr++;
}
if (endptr)
*endptr = (char *)nptr;
return minus ? -v : v;
}
