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libowfat/scan/scan_xlongn.c

13 lines
352 B

#include "scan.h"
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);
}