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/*
* strtoul.c
*
*/
#include "mystuff.h"
static inline int isspace(int c)
{
return (c <= ' '); /* Close enough */
}
static inline int digitval(int ch)
{
if (ch >= '0' && ch <= '9') {
return ch - '0';
} else if (ch >= 'A' && ch <= 'Z') {
return ch - 'A' + 10;
} else if (ch >= 'a' && ch <= 'z') {
return ch - 'a' + 10;
} else {
return -1;
}
}
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;
}
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