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lib/string_helpers: Introduce parse_int_array_user()
Add new helper function to allow for splitting specified user string into a sequence of integers. Internally it makes use of get_options() so the returned sequence contains the integers extracted plus an additional element that begins the sequence and specifies the integers count. Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com> Link: https://lore.kernel.org/r/20220904102840.862395-2-cezary.rojewski@intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -21,6 +21,8 @@ enum string_size_units {
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void string_get_size(u64 size, u64 blk_size, enum string_size_units units,
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char *buf, int len);
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int parse_int_array_user(const char __user *from, size_t count, int **array);
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#define UNESCAPE_SPACE BIT(0)
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#define UNESCAPE_OCTAL BIT(1)
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#define UNESCAPE_HEX BIT(2)
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@ -131,6 +131,50 @@ void string_get_size(u64 size, u64 blk_size, const enum string_size_units units,
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}
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EXPORT_SYMBOL(string_get_size);
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/**
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* parse_int_array_user - Split string into a sequence of integers
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* @from: The user space buffer to read from
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* @count: The maximum number of bytes to read
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* @array: Returned pointer to sequence of integers
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*
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* On success @array is allocated and initialized with a sequence of
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* integers extracted from the @from plus an additional element that
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* begins the sequence and specifies the integers count.
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*
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* Caller takes responsibility for freeing @array when it is no longer
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* needed.
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*/
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int parse_int_array_user(const char __user *from, size_t count, int **array)
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{
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int *ints, nints;
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char *buf;
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int ret = 0;
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buf = memdup_user_nul(from, count);
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if (IS_ERR(buf))
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return PTR_ERR(buf);
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get_options(buf, 0, &nints);
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if (!nints) {
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ret = -ENOENT;
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goto free_buf;
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}
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ints = kcalloc(nints + 1, sizeof(*ints), GFP_KERNEL);
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if (!ints) {
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ret = -ENOMEM;
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goto free_buf;
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}
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get_options(buf, nints + 1, ints);
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*array = ints;
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free_buf:
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kfree(buf);
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return ret;
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}
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EXPORT_SYMBOL(parse_int_array_user);
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static bool unescape_space(char **src, char **dst)
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{
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char *p = *dst, *q = *src;
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