/**
* get_option - Parse integer from an option string
* @str: option string
- * @pint: (output) integer value parsed from @str
+ * @pint: (optional output) integer value parsed from @str
*
* Read an int from an option string; if available accept a subsequent
* comma as well.
*
+ * When @pint is NULL the function can be used as a validator of
+ * the current option in the string.
+ *
* Return values:
* 0 - no int in string
* 1 - int found, no subsequent comma
int get_option(char **str, int *pint)
{
char *cur = *str;
+ int value;
if (!cur || !(*cur))
return 0;
if (*cur == '-')
- *pint = -simple_strtoull(++cur, str, 0);
+ value = -simple_strtoull(++cur, str, 0);
else
- *pint = simple_strtoull(cur, str, 0);
+ value = simple_strtoull(cur, str, 0);
+ if (pint)
+ *pint = value;
if (cur == *str)
return 0;
if (**str == ',') {
case 'E':
case 'e':
ret <<= 10;
- /* fall through */
+ fallthrough;
case 'P':
case 'p':
ret <<= 10;
- /* fall through */
+ fallthrough;
case 'T':
case 't':
ret <<= 10;
- /* fall through */
+ fallthrough;
case 'G':
case 'g':
ret <<= 10;
- /* fall through */
+ fallthrough;
case 'M':
case 'm':
ret <<= 10;
- /* fall through */
+ fallthrough;
case 'K':
case 'k':
ret <<= 10;
endptr++;
+ fallthrough;
default:
break;
}