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
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;
|
|
}
|