# locale-tr.m4 serial 15
dnl Copyright (C) 2003, 2005-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Bruno Haible.

dnl Determine the name of a turkish locale with UTF-8 encoding.
AC_DEFUN_ONCE([gt_LOCALE_TR_UTF8],
[
  AC_REQUIRE([AC_CANONICAL_HOST])
  AC_REQUIRE([AM_LANGINFO_CODESET])
  AC_CACHE_CHECK([for a turkish Unicode locale], [gt_cv_locale_tr_utf8], [
    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
#include <locale.h>
#include <time.h>
#if HAVE_LANGINFO_CODESET
# include <langinfo.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <wctype.h>
struct tm t;
char buf[16];
int main () {
  /* On BeOS, locales are not implemented in libc.  Rather, libintl
     imitates locale dependent behaviour by looking at the environment
     variables, and all locales use the UTF-8 encoding.  But BeOS does not
     implement the Turkish upper-/lowercase mappings.  Therefore, let this
     program return 1 on BeOS.  */
  /* Check whether the given locale name is recognized by the system.  */
#if defined _WIN32 && !defined __CYGWIN__
  /* On native Windows, setlocale(category, "") looks at the system settings,
     not at the environment variables.  Also, when an encoding suffix such
     as ".65001" or ".54936" is specified, it succeeds but sets the LC_CTYPE
     category of the locale to "C".  */
  if (setlocale (LC_ALL, getenv ("LC_ALL")) == NULL
      || strcmp (setlocale (LC_CTYPE, NULL), "C") == 0)
    return 1;
#else
  if (setlocale (LC_ALL, "") == NULL) return 1;
#endif
  /* Check whether nl_langinfo(CODESET) is nonempty and not "ASCII" or "646".
     On Mac OS X 10.3.5 (Darwin 7.5) in the tr_TR locale, nl_langinfo(CODESET)
     is empty, and the behaviour of Tcl 8.4 in this locale is not useful.
     On OpenBSD 4.0, when an unsupported locale is specified, setlocale()
     succeeds but then nl_langinfo(CODESET) is "646". In this situation,
     some unit tests fail.  */
#if HAVE_LANGINFO_CODESET
  {
    const char *cs = nl_langinfo (CODESET);
    if (cs[0] == '\0' || strcmp (cs, "ASCII") == 0 || strcmp (cs, "646") == 0)
      return 1;
  }
#endif
#ifdef __CYGWIN__
  /* On Cygwin, avoid locale names without encoding suffix, because the
     locale_charset() function relies on the encoding suffix.  Note that
     LC_ALL is set on the command line.  */
  if (strchr (getenv ("LC_ALL"), '.') == NULL) return 1;
#endif
  /* Check whether in the abbreviation of the eighth month, the second
     character (should be U+011F: LATIN SMALL LETTER G WITH BREVE) is
     two bytes long, with UTF-8 encoding.  */
  t.tm_year = 1992 - 1900; t.tm_mon = 8 - 1; t.tm_mday = 19;
  if (strftime (buf, sizeof (buf), "%b", &t) < 4
      || buf[1] != (char) 0xc4 || buf[2] != (char) 0x9f)
    return 1;
  /* Check whether the upper-/lowercase mappings are as expected for
     Turkish.  */
  if (towupper ('i') != 0x0130 || towlower (0x0130) != 'i'
      || towupper(0x0131) != 'I' || towlower ('I') != 0x0131)
    return 1;
  return 0;
}
      ]])])
    if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
      case "$host_os" in
        # Handle native Windows specially, because there setlocale() interprets
        # "ar" as "Arabic" or "Arabic_Saudi Arabia.1256",
        # "fr" or "fra" as "French" or "French_France.1252",
        # "ge"(!) or "deu"(!) as "German" or "German_Germany.1252",
        # "ja" as "Japanese" or "Japanese_Japan.932",
        # and similar.
        mingw* | windows*)
          # Test for the hypothetical native Windows locale name.
          if (LC_ALL=Turkish_Turkey.65001 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
            gt_cv_locale_tr_utf8=Turkish_Turkey.65001
          else
            # None found.
            gt_cv_locale_tr_utf8=none
          fi
          ;;
        *)
          # Setting LC_ALL is not enough. Need to set LC_TIME to empty, because
          # otherwise on Mac OS X 10.3.5 the LC_TIME=C from the beginning of the
          # configure script would override the LC_ALL setting. Likewise for
          # LC_CTYPE, which is also set at the beginning of the configure script.
          # Test for the usual locale name.
          if (LC_ALL=tr_TR LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
            gt_cv_locale_tr_utf8=tr_TR
          else
            # Test for the locale name with explicit encoding suffix.
            if (LC_ALL=tr_TR.UTF-8 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
              gt_cv_locale_tr_utf8=tr_TR.UTF-8
            else
              # Test for the Solaris 7 locale name.
              if (LC_ALL=tr.UTF-8 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
                gt_cv_locale_tr_utf8=tr.UTF-8
              else
                # None found.
                gt_cv_locale_tr_utf8=none
              fi
            fi
          fi
          ;;
      esac
    else
      gt_cv_locale_tr_utf8=none
    fi
    rm -fr conftest*
  ])
  LOCALE_TR_UTF8=$gt_cv_locale_tr_utf8
  case $LOCALE_TR_UTF8 in #(
    '' | *[[[:space:]\"\$\'*@<:@]]*)
      dnl This locale name might cause trouble with sh or make.
      AC_MSG_WARN([invalid locale "$LOCALE_TR_UTF8"; assuming "none"])
      LOCALE_TR_UTF8=none;;
  esac
  AC_SUBST([LOCALE_TR_UTF8])
])