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#include "scan.h"








size_t scan_8longlong(const char *src,unsigned long long *dest) {




/* make a copy of src so we can return the number of bytes we progressed */




register const char *tmp=src;




register unsigned long long l=0;




register unsigned char c;




/* *tmp  '0' can be negative, but casting to unsigned char makes




* those cases positive and large; that means we only need one




* comparison. This trick is no longer needed on modern compilers,




* but we also want to produce good code on old compilers :) */




while ((c=(unsigned char)(*tmp'0'))<8) {




/* overflow check; for each digit we multiply by 8 and then add the




* digit; 07 needs 3 bits of storage, so we need to check if the




* uppermost 3 bits of l are empty. Do it by shifting to the right */




if (l>>(sizeof(l)*83)) break;




l=l*8+c;




++tmp;




}




*dest=l;




return (size_t)(tmpsrc);




}
