You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

20 lines
464 B
C

#include "scan.h"
unsigned int scan_ulonglong(const char *src,unsigned long long *dest) {
register const char *tmp=src;
register unsigned long long l=0;
register unsigned char c;
while ((c=*tmp-'0')<10) {
unsigned long long n;
/* division is very slow on most architectures */
n=l<<3; if ((n>>3)!=l) break;
if (n+(l<<1) < n) break;
n+=l<<1;
if (n+c < n) break;
l=n+c;
++tmp;
}
if (tmp-src) *dest=l;
return tmp-src;
}