[cfe-dev] Regex/locale libcxx test failure on FreeBSD

[Eric Fiselier via cfe-dev]

Please file a bug or submit a patch.

/Eric

On Fri, Oct 14, 2016 at 6:38 PM, Krzysztof Parzyszek via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> The test is
> projects/libcxx/test/std/re/re.alg/re.alg.match/basic.pass.cpp
>
> This assertion fails on FreeBSD:
>
>     std::locale::global(std::locale(LOCALE_cs_CZ_ISO8859_2));
>     {
>         std::cmatch m;
>         const char s[] = "m";
>         assert(std::regex_match(s, m, std::regex("[a[=M=]z]",
>                                 std::regex_constants::basic)));
>
>
> From the looks of it, "m" should not match "[=M=]".  M is not a special
> letter in Czech, as far as I know, and the match is case-sensitive.
>
> Libc seems to agree with this:
>
> --- t.c ---
> #include <locale.h>
> #include <stdio.h>
> #include <regex.h>
>
> char errbuf[1024];
>
> int main() {
>   int r;
>   regex_t re;
>   regmatch_t m;
>
>   setlocale(LC_COLLATE, "cs_CZ.ISO8859_2");
>
>   r = regcomp(&re, "[a[=M=]z]", REG_BASIC);
>   printf("regcomp=%d\n", r);
>
>   r = regexec(&re, "m", 0, &m, 0);
>   printf("regexec=%d\n", r);
>
>   if (r != 0) {
>     regerror(r, &re, errbuf, 1023);
>     printf("error: %s\n", errbuf);
>   }
> }
> -----------
>
> clang t.c
> ./a.out
>
> regcomp=0
> regexec=1
> error: regexec() failed to match
>
>
> If the string in t.c is "M", it matches.
>
> -Krzysztof
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