1# locale-zh.m4 serial 12
2dnl Copyright (C) 2003, 2005-2012 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8
9dnl Determine the name of a chinese locale with GB18030 encoding.
10AC_DEFUN([gt_LOCALE_ZH_CN],
11[
12  AC_REQUIRE([AC_CANONICAL_HOST])
13  AC_REQUIRE([AM_LANGINFO_CODESET])
14  AC_CACHE_CHECK([for a transitional chinese locale], [gt_cv_locale_zh_CN], [
15    AC_LANG_CONFTEST([AC_LANG_SOURCE([
16changequote(,)dnl
17#include <locale.h>
18#include <stdlib.h>
19#include <time.h>
20#if HAVE_LANGINFO_CODESET
21# include <langinfo.h>
22#endif
23#include <stdlib.h>
24#include <string.h>
25struct tm t;
26char buf[16];
27int main ()
28{
29  const char *p;
30  /* Check whether the given locale name is recognized by the system.  */
31#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
32  /* On native Windows, setlocale(category, "") looks at the system settings,
33     not at the environment variables.  Also, when an encoding suffix such
34     as ".65001" or ".54936" is specified, it succeeds but sets the LC_CTYPE
35     category of the locale to "C".  */
36  if (setlocale (LC_ALL, getenv ("LC_ALL")) == NULL
37      || strcmp (setlocale (LC_CTYPE, NULL), "C") == 0)
38    return 1;
39#else
40  if (setlocale (LC_ALL, "") == NULL) return 1;
41#endif
42  /* Check whether nl_langinfo(CODESET) is nonempty and not "ASCII" or "646".
43     On Mac OS X 10.3.5 (Darwin 7.5) in the fr_FR locale, nl_langinfo(CODESET)
44     is empty, and the behaviour of Tcl 8.4 in this locale is not useful.
45     On OpenBSD 4.0, when an unsupported locale is specified, setlocale()
46     succeeds but then nl_langinfo(CODESET) is "646". In this situation,
47     some unit tests fail.
48     On MirBSD 10, when an unsupported locale is specified, setlocale()
49     succeeds but then nl_langinfo(CODESET) is "UTF-8".  */
50#if HAVE_LANGINFO_CODESET
51  {
52    const char *cs = nl_langinfo (CODESET);
53    if (cs[0] == '\0' || strcmp (cs, "ASCII") == 0 || strcmp (cs, "646") == 0
54        || strcmp (cs, "UTF-8") == 0)
55      return 1;
56  }
57#endif
58#ifdef __CYGWIN__
59  /* On Cygwin, avoid locale names without encoding suffix, because the
60     locale_charset() function relies on the encoding suffix.  Note that
61     LC_ALL is set on the command line.  */
62  if (strchr (getenv ("LC_ALL"), '.') == NULL) return 1;
63#endif
64  /* Check whether in a month name, no byte in the range 0x80..0x9F occurs.
65     This excludes the UTF-8 encoding (except on MirBSD).  */
66  t.tm_year = 1975 - 1900; t.tm_mon = 2 - 1; t.tm_mday = 4;
67  if (strftime (buf, sizeof (buf), "%B", &t) < 2) return 1;
68  for (p = buf; *p != '\0'; p++)
69    if ((unsigned char) *p >= 0x80 && (unsigned char) *p < 0xa0)
70      return 1;
71  /* Check whether a typical GB18030 multibyte sequence is recognized as a
72     single wide character.  This excludes the GB2312 and GBK encodings.  */
73  if (mblen ("\203\062\332\066", 5) != 4)
74    return 1;
75  return 0;
76}
77changequote([,])dnl
78      ])])
79    if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
80      case "$host_os" in
81        # Handle native Windows specially, because there setlocale() interprets
82        # "ar" as "Arabic" or "Arabic_Saudi Arabia.1256",
83        # "fr" or "fra" as "French" or "French_France.1252",
84        # "ge"(!) or "deu"(!) as "German" or "German_Germany.1252",
85        # "ja" as "Japanese" or "Japanese_Japan.932",
86        # and similar.
87        mingw*)
88          # Test for the hypothetical native Windows locale name.
89          if (LC_ALL=Chinese_China.54936 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
90            gt_cv_locale_zh_CN=Chinese_China.54936
91          else
92            # None found.
93            gt_cv_locale_zh_CN=none
94          fi
95          ;;
96        solaris2.8)
97          # On Solaris 8, the locales zh_CN.GB18030, zh_CN.GBK, zh.GBK are
98          # broken. One witness is the test case in gl_MBRTOWC_SANITYCHECK.
99          # Another witness is that "LC_ALL=zh_CN.GB18030 bash -c true" dumps core.
100          gt_cv_locale_zh_CN=none
101          ;;
102        *)
103          # Setting LC_ALL is not enough. Need to set LC_TIME to empty, because
104          # otherwise on Mac OS X 10.3.5 the LC_TIME=C from the beginning of the
105          # configure script would override the LC_ALL setting. Likewise for
106          # LC_CTYPE, which is also set at the beginning of the configure script.
107          # Test for the locale name without encoding suffix.
108          if (LC_ALL=zh_CN LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
109            gt_cv_locale_zh_CN=zh_CN
110          else
111            # Test for the locale name with explicit encoding suffix.
112            if (LC_ALL=zh_CN.GB18030 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
113              gt_cv_locale_zh_CN=zh_CN.GB18030
114            else
115              # None found.
116              gt_cv_locale_zh_CN=none
117            fi
118          fi
119          ;;
120      esac
121    else
122      # If there was a link error, due to mblen(), the system is so old that
123      # it certainly doesn't have a chinese locale.
124      gt_cv_locale_zh_CN=none
125    fi
126    rm -fr conftest*
127  ])
128  LOCALE_ZH_CN=$gt_cv_locale_zh_CN
129  AC_SUBST([LOCALE_ZH_CN])
130])
131