illumos gate

Here's a test program:

#include <wctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <locale.h>

int
main(int argc, char **argv)
{
    int z = '0';
    int a = 'A';
    int g = 'G';
    wint_t wz = '0';
    wint_t wa = 'A';
    wint_t wg = 'g';

    locale_t l;

    l = newlocale(LC_ALL_MASK, "POSIX", (locale_t)0);
    if (l == NULL)
        err(EXIT_FAILURE, "newlocale");

    if (!isxdigit_l(z, l))
        errx(EXIT_FAILURE, "isxdigit_l(z) failed");
    if (!isxdigit_l(a, l))
        errx(EXIT_FAILURE, "isxdigit_l(a) failed");
    if (isxdigit_l(g, l))
        errx(EXIT_FAILURE, "isxdigit_l(g) should have failed");
    if (!iswxdigit_l(wz, l))
        errx(EXIT_FAILURE, "iswxdigit_l(wz) failed");
    if (!iswxdigit_l(wa, l))
        errx(EXIT_FAILURE, "iswxdigit_l(wg) failed");
    if (iswxdigit_l(wg, l))
        errx(EXIT_FAILURE, "iswxdigit_l(wg) should have failed");
    printf("OK\\\\n");
    return (0);
}