On 7/8/2016 6:43 PM, Markus Mayer wrote:
This series introduces a family of generic string case conversion
functions. This kind of functionality is needed in several places in
the kernel. Right now, everybody seems to be implementing their own
copy of this functionality.
Based on the discussion of the previous version of this series[1] and
the use cases found in the kernel, it does look like having several
flavours of case conversion functions is beneficial. The use cases fall
into three categories:
- copying a string and converting the case while specifying a
maximum length to mimic strlcpy()
- copying a string and converting the case without specifying a
length to mimic strcpy()
- converting the case of a string in-place (i.e. modifying the
string that was passed in)
Consequently, I am proposing these new functions:
void strlcpytoupper(char *dst, const char *src, size_t len);
void strlcpytolower(char *dst, const char *src, size_t len);
void strcpytoupper(char *dst, const char *src);
void strcpytolower(char *dst, const char *src);
void strtoupper(char *s);
void strtolower(char *s);
You may want to read the article here:
https://lwn.net/Articles/659214/
and follow up some of the discussion threads on LKML about the best
semantics to advertise for the strlcpy/strscpy variants. It might be
helpful to return some kind of overflow/truncation error from your
copy functions so people can error-check the result.
--
Chris Metcalf, Mellanox Technologies
http://www.mellanox.com
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