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39 lines
1.1 KiB
C
39 lines
1.1 KiB
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_xlongn(const char *src,size_t n,unsigned long *dest) {
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register const char *tmp=src;
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register unsigned long l=0;
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register unsigned char c;
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while (n-->0 && (l>>(sizeof(l)*8-4))==0 && (c=(unsigned char)scan_fromhex((unsigned char)*tmp))<16) {
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l=(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 long i;
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assert(scan_xlongn("fefe",4,&i)==4 && i==0xfefe);
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assert(scan_xlongn("0xfefe",6,&i)==1); // 0x not supported, will scan the 0
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assert(scan_xlongn("+fefe",5,&i)==0);
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assert(scan_xlongn("fefec0de",7,&i)==7 && i==0xfefec0d);
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assert(scan_xlongn("fefec0de",8,&i)==8 && i==0xfefec0de);
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assert(scan_xlongn("fefec0de",9,&i)==8 && i==0xfefec0de);
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if (sizeof(i)==4)
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assert(scan_xlongn("fefec0debaad",14,&i)==8 && i==0xfefec0de); // test truncation
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else if (sizeof(i)==8)
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assert(scan_xlongn("fefec0debaadc0debl06",21,&i)==16 && i==0xfefec0debaadc0de); // test truncation
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return 0;
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}
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#endif
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