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33 lines
766 B
C
33 lines
766 B
C
#include "scan.h"
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#ifdef UNITTEST
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#undef UNITTEST
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#include "scan_fromhex.c"
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#define UNITTEST
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#endif
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size_t scan_xshort(const char* src,unsigned short* dest) {
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register const char *tmp=src;
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register unsigned short l=0;
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register unsigned char c;
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while ((l>>(sizeof(l)*8-4))==0 && (c=(unsigned char)scan_fromhex((unsigned char)*tmp))<16) {
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l=(unsigned short)((l<<4)+c);
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++tmp;
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}
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*dest=l;
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return (size_t)(tmp-src);
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}
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#ifdef UNITTEST
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#include <assert.h>
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int main() {
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unsigned short i;
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assert(scan_xshort("fefe",&i)==4 && i==0xfefe);
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assert(scan_xshort("0xfefe",&i)==1); // 0x not supported, will scan the 0
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assert(scan_xshort("+fefe",&i)==0);
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assert(scan_xshort("fefec0de",&i)==4 && i==0xfefe); // test truncation
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return 0;
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}
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#endif
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