libowfat/scan/scan_xlong.c

#include "scan.h"
#include "haveinline.h"

static inline int fromhex(unsigned char c) {
  if (c>='0' && c<='9')
    return c-'0';
  else if (c>='A' && c<='F')
    return c-'A'+10;
  else if (c>='a' && c<='f')
    return c-'a'+10;
  return -1;
}

unsigned int scan_xlong(const char *src,unsigned long *dest) {
  register const char *tmp=src;
  register int l=0;
  register unsigned char c;
  while ((c=fromhex(*tmp))<16) {
    l=(l<<4)+c;
    ++tmp;
  }
  *dest=l;
  return tmp-src;
}