[PATCH v4 5/6] lib/cmdline: Allow NULL to be an output for get_option()

Andy Shevchenko
2020-11-12T18:07:43Z

In the future we would like to use get_option() to only validate
the string and parse it separately. To achieve this, allow
NULL to be an output for get_option().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v4: new patch
lib/cmdline.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/lib/cmdline.c b/lib/cmdline.c
index ca89846ee0bb..9e186234edc0 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -35,11 +35,14 @@ static int get_range(char **str, int *pint, int n)
/**
* 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
@@ -53,13 +56,16 @@ static int get_range(char **str, int *pint, int n)
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 == ',') {
--
2.28.0