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libowfat/scan/scan_ulonglong.c

19 lines
485 B

#include "scan.h"
size_t 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=(unsigned char)(*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 (size_t)(tmp-src);
}