scan_8long.c

linux下qmail的源码 本人加了一些注释

#include "scan.h"

unsigned int scan_8long(s,u) register char *s; register unsigned long *u;
{
  register unsigned int pos; register unsigned long result;
  register unsigned long c;
  pos = 0; result = 0;
  while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 8)
    { result = result * 8 + c; ++pos; }
  *u = result; return pos;
}