tunittoull.c - plan9port - [fork] Plan 9 from user space
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       ---
       tunittoull.c (471B)
       ---
            1 #include "stdinc.h"
            2 
            3 #define TWID64        ((u64int)~(u64int)0)
            4 
            5 u64int
            6 unittoull(char *s)
            7 {
            8         char *es;
            9         u64int n;
           10 
           11         if(s == nil)
           12                 return TWID64;
           13         n = strtoul(s, &es, 0);
           14         if(*es == 'k' || *es == 'K'){
           15                 n *= 1024;
           16                 es++;
           17         }else if(*es == 'm' || *es == 'M'){
           18                 n *= 1024*1024;
           19                 es++;
           20         }else if(*es == 'g' || *es == 'G'){
           21                 n *= 1024*1024*1024;
           22                 es++;
           23         }else if(*es == 't' || *es == 'T'){
           24                 n *= 1024*1024;
           25                 n *= 1024*1024;
           26         }
           27         if(*es != '\0')
           28                 return TWID64;
           29         return n;
           30 }