#include <sys/types.h>
 #include <stdlib.h>
 #include <limits.h>
 #include <ctype.h>
 #include <stdio.h>
 
 /* We only handle base 10. */
 long long int strtoll(const char *nptr, char **endptr, int base) {
     long long int retval = 0;
     const char **endptrd = (const char **) endptr;
     const char *idx = NULL;
     int allowspace = 1;
 
     idx = nptr;
     while (1) {
         if (*idx == '\0') {
             break;
         }
 
         if (!isdigit(*idx)) {
             if (*idx == '-') {
                 retval *= -1;
                 continue;
             }
             if ((*idx == ' ' || *idx == '\t') && allowspace) {
                 continue;
             }
             break;
         }
 
         retval *= 10;
         retval += (*idx - '0');
 
         allowspace = 0;
         idx++;
     }
 
     if (endptrd != NULL) {
         *endptrd = idx;
     }
 
     return(retval);
 }