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32 lines
766 B
32 lines
766 B
#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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