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       atoll.c - scc - simple c99 compiler
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       ---
       atoll.c (378B)
       ---
            1 #include <ctype.h>
            2 #include <stdlib.h>
            3 
            4 #include "../libc.h"
            5 
            6 #undef atoll
            7 
            8 long long
            9 atoll(const char *s)
           10 {
           11         int d, sign = -1;
           12         long long n;
           13 
           14         while (isspace(*s))
           15                 ++s;
           16 
           17         switch (*s) {
           18         case '-':
           19                 sign = 1;
           20         case '+':
           21                 ++s;
           22         }
           23 
           24         /* Compute n as a negative number to avoid overflow on LLONG_MIN */
           25         for (n = 0; (d = _dtoi(*s)) < 10; ++s)
           26                 n = n*10 - d;
           27 
           28         return sign * n;
           29 }