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lib/string.c: update match_string() doc-strings with correct behavior 

There were a few attempts at changing behavior of the match_string()
helpers (i.e.  'match_string()' & 'sysfs_match_string()'), to change &
extend the behavior according to the doc-string.

But the simplest approach is to just fix the doc-strings.  The current
behavior is fine as-is, and some bugs were introduced trying to fix it.

As for extending the behavior, new helpers can always be introduced if
needed.

The match_string() helpers behave more like 'strncmp()' in the sense
that they go up to n elements or until the first NULL element in the
array of strings.

This change updates the doc-strings with this info.

Link: http://lkml.kernel.org/r/20200213072722.8249-1-alexandru.ardelean@analog.com
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: "Tobin C . Harding" <tobin@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandru Ardelean 2020-02-20 20:04:21 -08:00 committed by Linus Torvalds
parent 75866af62b
commit c11d3fa011
1 changed files with 16 additions and 0 deletions
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16
lib/string.c
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@ -699,6 +699,14 @@ EXPORT_SYMBOL(sysfs_streq);
* @n: number of strings in the array or -1 for NULL terminated arrays
* @string: string to match with
*
* This routine will look for a string in an array of strings up to the
* n-th element in the array or until the first NULL element.
*
* Historically the value of -1 for @n, was used to search in arrays that
* are NULL terminated. However, the function does not make a distinction
* when finishing the search: either @n elements have been compared OR
* the first NULL element was found.
*
* Return:
* index of a @string in the @array if matches, or %-EINVAL otherwise.
*/
@ -727,6 +735,14 @@ EXPORT_SYMBOL(match_string);
*
* Returns index of @str in the @array or -EINVAL, just like match_string().
* Uses sysfs_streq instead of strcmp for matching.
*
* This routine will look for a string in an array of strings up to the
* n-th element in the array or until the first NULL element.
*
* Historically the value of -1 for @n, was used to search in arrays that
* are NULL terminated. However, the function does not make a distinction
* when finishing the search: either @n elements have been compared OR
* the first NULL element was found.
*/
int __sysfs_match_string(const char * const *array, size_t n, const char *str)
{