Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include "scan.h"
#ifdef UNITTEST
#undef UNITTEST
#include "scan_fromhex.c"
#define UNITTEST
#endif
size_t scan_xlongn(const char *src,size_t n,unsigned long *dest) {
register const char *tmp=src;
register unsigned long l=0;
register unsigned char c;
while (n-->0 && (l>>(sizeof(l)*8-4))==0 && (c=(unsigned char)scan_fromhex((unsigned char)*tmp))<16) {
l=(l<<4)+c;
++tmp;
}
*dest=l;
return (size_t)(tmp-src);
}
#ifdef UNITTEST
#include <assert.h>
int main() {
unsigned long i;
assert(scan_xlongn("fefe",4,&i)==4 && i==0xfefe);
assert(scan_xlongn("0xfefe",6,&i)==1); // 0x not supported, will scan the 0
assert(scan_xlongn("+fefe",5,&i)==0);
assert(scan_xlongn("fefec0de",7,&i)==7 && i==0xfefec0d);
assert(scan_xlongn("fefec0de",8,&i)==8 && i==0xfefec0de);
assert(scan_xlongn("fefec0de",9,&i)==8 && i==0xfefec0de);
if (sizeof(i)==4)
assert(scan_xlongn("fefec0debaad",14,&i)==8 && i==0xfefec0de); // test truncation
else if (sizeof(i)==8)
assert(scan_xlongn("fefec0debaadc0debl06",40,&i)==16 && i==0xfefec0debaadc0de); // test truncation
return 0;
}
#endif