- for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
- value = 10 * value + (*s - '0');
- if (*s && !isspace(*s))
- return -EINVAL;
- while (left && isspace(*s))
- left--, s++;
+ value = simple_strtol(tmpbuf, &s, 0);
+ if (s) {
+ left -= (s - tmpbuf);
+ if (left && !isspace(*s))
+ return -EINVAL;
+ while (left && isspace(*s))
+ left--, s++;
+ } else
+ left = 0;