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Re: RFC: mblen() return code when n is zero
- From: Paul Eggert <eggert at cs dot ucla dot edu>
- To: Rajalakshmi Srinivasaraghavan <raji at linux dot vnet dot ibm dot com>, libc-alpha at sourceware dot org, Andreas Schwab <schwab at suse dot de>
- Date: Mon, 17 Nov 2014 08:23:16 -0800
- Subject: Re: RFC: mblen() return code when n is zero
- Authentication-results: sourceware.org; auth=none
- References: <5461A2B7 dot 5070402 at linux dot vnet dot ibm dot com> <5461B0B8 dot 4010406 at cs dot ucla dot edu> <5469AF54 dot 3000003 at linux dot vnet dot ibm dot com>
Rajalakshmi Srinivasaraghavan wrote:
To get clarified on previous comments,What should mblen (mblen() calls
__mbrtowc() internally) return for the above testcase?
There was no "above testcase" in your email, but I suppose mblen and mbtowc
should return -1 when given empty inputs, as in this case the leading bytes of
the input buffer do not form a valid multibyte character. Although POSIX
doesn't say what errno value to use, EILSEQ doesn't seem appropriate here. What
errno values do other C libraries use? I'd be guided by that.