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lib/cmdline: allow NULL to be an output for get_option() 

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().

Link: https://lkml.kernel.org/r/20201112180732.75589-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Vitor Massaru Iha <vitor@massaru.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Shevchenko 2020-12-15 20:43:30 -08:00 committed by Linus Torvalds
parent e291851d65
commit 6b2b6b8646
1 changed files with 9 additions and 3 deletions
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12
lib/cmdline.c
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@ -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 == ',') {