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#include "scan.h"
#ifdef UNITTEST
#undef UNITTEST
#include "scan_fromhex.c"
#define UNITTEST
#endif
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);
++tmp;
}
*dest=l;
return (size_t)(tmp-src);
}
#ifdef UNITTEST
#include <assert.h>
int main() {
unsigned short i;
assert(scan_xshort("fefe",&i)==4 && i==0xfefe);
assert(scan_xshort("0xfefe",&i)==1); // 0x not supported, will scan the 0
assert(scan_xshort("+fefe",&i)==0);
assert(scan_xshort("fefec0de",&i)==4 && i==0xfefe); // test truncation
return 0;
}
#endif
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