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#include <ctype.h>
extern unsigned long int strtoul(const char *nptr, char **endptr, int base);
long int strtol(const char *nptr, char **endptr, int base)
{
int neg=0;
unsigned long int v;
while(isspace(*nptr)) nptr++;
if (*nptr == '-' && isdigit(nptr[1])) { neg=-1; nptr++; }
v=strtoul(nptr,endptr,base);
return (neg?-v:v);
}
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