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354 B

#include "scan.h"
size_t scan_xshort(const char* src,unsigned short* dest) {
register const char *tmp=src;
register unsigned short l=0;
register unsigned char c;
while ((l>>(sizeof(l)*8-4))==0 && (c=(unsigned char)scan_fromhex((unsigned char)*tmp))<16) {
l=(unsigned short)((l<<4)+c);
return (size_t)(tmp-src);