Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "scan.h"
size_t scan_ulong(const char* src,unsigned long int* dest) {
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register const char *tmp=src;
register unsigned long int l=0;
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register unsigned char c;
while ((c=*tmp-'0')<10) {
unsigned long int 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;
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++tmp;
}
if (tmp-src) *dest=l;
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return tmp-src;
}