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