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#include <ctype.h>
static char *num="0123456789abcdefghijklmnopqrstuvwxyz";
unsigned long int strtoul(const char *nptr, char **endptr, int base)
{
long int v=0;
int a=1,i;
while(isspace(*nptr)) nptr++;
if (*nptr == '+') { nptr++; }
if (!base)
{
if (*nptr=='0')
{
base=8;
if ((*(nptr+1)=='x')||(*(nptr+1)=='X')) base=16;
}
else
base=10;
}
while((a)&&(*nptr))
{
a=0;
for (i=0;(!a)&&(i<base);i++)
{
if ((*nptr == num[i]) || (*nptr == (num[i]-' ')))
{
a=1;
v=(v*base)+(&num[i]-num);
}
}
if ((!a)&&(base==16)&&((*nptr=='x')||(*nptr=='X'))) a=1;
if (a) nptr++;
}
if (endptr) *endptr=(char *)nptr;
return v;
}
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