On Thu, Mar 06, 2008 at 09:42:33PM +0100, Mike Hommey wrote:
> Package: libc6
> Version: 2.7-9
> Followup-For: Bug #208308
>
> Bug #208308 is the reason for bug #456653. And it shouldn't happen.
>
> With the following testcase, it happens while it shouldn't, according to
> the manual:
> -----8<-------
> #include <stdio.h>
> #include <locale.h>
>
> #define STR "²éľÂíɱ²¡¶¾£¬ÖܺèµtÄúµÄ360²»×¨Òµ£¡"
>
> int main(void) {
> char buf[200];
> setlocale(LC_ALL, "");
> printf("%d\n", snprintf(buf, 150, "%.50s", STR));
> return 0;
> }
> ----->8-------
>
> The manual page has this to say:
> About precision:
> An optional precision, in the form of a period (‘.’) followed by an
> optional decimal digit string.(...) This gives (...) the maximum
> number of characters to be printed from a string for s and S
> conversions.
>
> About s:
> If no l modifier is present: The const char * argument is expected to
> be a pointer to an array of character type(...)
>
> If an l modifier is present: The const wchar_t * argument is expected
> to be a pointer to an array of wide characters. Wide characters from
> the array are converted to multibyte characters (...)
>
> There is no "l" modifier, but still, the string goes through the
> multibyte conversion code, and fails because the string is invalid
> multibyte.
Note, it only works with non UTF-8 locale set in LC_CTYPE or LC_ALL.
Mike
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