1# locale-zh.m4 serial 15
2dnl Copyright (C) 2003, 2005-2020 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([[
16#include <locale.h>
17#include <stdlib.h>
18#include <time.h>
19#if HAVE_LANGINFO_CODESET
20# include <langinfo.h>
21#endif
22#include <stdlib.h>
23#include <string.h>
24struct tm t;
25char buf[16];
26int main ()
27{
28  /* On BeOS and Haiku, locales are not implemented in libc.  Rather, libintl
29     imitates locale dependent behaviour by looking at the environment
30     variables, and all locales use the UTF-8 encoding.  */
31#if defined __BEOS__ || defined __HAIKU__
32  return 1;
33#else
34  /* Check whether the given locale name is recognized by the system.  */
35# if defined _WIN32 && !defined __CYGWIN__
36  /* On native Windows, setlocale(category, "") looks at the system settings,
37     not at the environment variables.  Also, when an encoding suffix such
38     as ".65001" or ".54936" is specified, it succeeds but sets the LC_CTYPE
39     category of the locale to "C".  */
40  if (setlocale (LC_ALL, getenv ("LC_ALL")) == NULL
41      || strcmp (setlocale (LC_CTYPE, NULL), "C") == 0)
42    return 1;
43# else
44  if (setlocale (LC_ALL, "") == NULL) return 1;
45# endif
46  /* Check whether nl_langinfo(CODESET) is nonempty and not "ASCII" or "646".
47     On Mac OS X 10.3.5 (Darwin 7.5) in the fr_FR locale, nl_langinfo(CODESET)
48     is empty, and the behaviour of Tcl 8.4 in this locale is not useful.
49     On OpenBSD 4.0, when an unsupported locale is specified, setlocale()
50     succeeds but then nl_langinfo(CODESET) is "646". In this situation,
51     some unit tests fail.
52     On MirBSD 10, when an unsupported locale is specified, setlocale()
53     succeeds but then nl_langinfo(CODESET) is "UTF-8".  */
54# if HAVE_LANGINFO_CODESET
55  {
56    const char *cs = nl_langinfo (CODESET);
57    if (cs[0] == '\0' || strcmp (cs, "ASCII") == 0 || strcmp (cs, "646") == 0
58        || strcmp (cs, "UTF-8") == 0)
59      return 1;
60  }
61# endif
62# ifdef __CYGWIN__
63  /* On Cygwin, avoid locale names without encoding suffix, because the
64     locale_charset() function relies on the encoding suffix.  Note that
65     LC_ALL is set on the command line.  */
66  if (strchr (getenv ("LC_ALL"), '.') == NULL) return 1;
67# endif
68  /* Check whether in a month name, no byte in the range 0x80..0x9F occurs.
69     This excludes the UTF-8 encoding (except on MirBSD).  */
70  {
71    const char *p;
72    t.tm_year = 1975 - 1900; t.tm_mon = 2 - 1; t.tm_mday = 4;
73    if (strftime (buf, sizeof (buf), "%B", &t) < 2) return 1;
74    for (p = buf; *p != '\0'; p++)
75      if ((unsigned char) *p >= 0x80 && (unsigned char) *p < 0xa0)
76        return 1;
77  }
78  /* Check whether a typical GB18030 multibyte sequence is recognized as a
79     single wide character.  This excludes the GB2312 and GBK encodings.  */
80  if (mblen ("\203\062\332\066", 5) != 4)
81    return 1;
82  return 0;
83#endif
84}
85      ]])])
86    if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
87      case "$host_os" in
88        # Handle native Windows specially, because there setlocale() interprets
89        # "ar" as "Arabic" or "Arabic_Saudi Arabia.1256",
90        # "fr" or "fra" as "French" or "French_France.1252",
91        # "ge"(!) or "deu"(!) as "German" or "German_Germany.1252",
92        # "ja" as "Japanese" or "Japanese_Japan.932",
93        # and similar.
94        mingw*)
95          # Test for the hypothetical native Windows locale name.
96          if (LC_ALL=Chinese_China.54936 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
97            gt_cv_locale_zh_CN=Chinese_China.54936
98          else
99            # None found.
100            gt_cv_locale_zh_CN=none
101          fi
102          ;;
103        solaris2.8)
104          # On Solaris 8, the locales zh_CN.GB18030, zh_CN.GBK, zh.GBK are
105          # broken. One witness is the test case in gl_MBRTOWC_SANITYCHECK.
106          # Another witness is that "LC_ALL=zh_CN.GB18030 bash -c true" dumps core.
107          gt_cv_locale_zh_CN=none
108          ;;
109        *)
110          # Setting LC_ALL is not enough. Need to set LC_TIME to empty, because
111          # otherwise on Mac OS X 10.3.5 the LC_TIME=C from the beginning of the
112          # configure script would override the LC_ALL setting. Likewise for
113          # LC_CTYPE, which is also set at the beginning of the configure script.
114          # Test for the locale name without encoding suffix.
115          if (LC_ALL=zh_CN LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
116            gt_cv_locale_zh_CN=zh_CN
117          else
118            # Test for the locale name with explicit encoding suffix.
119            if (LC_ALL=zh_CN.GB18030 LC_TIME= LC_CTYPE= ./conftest; exit) 2>/dev/null; then
120              gt_cv_locale_zh_CN=zh_CN.GB18030
121            else
122              # None found.
123              gt_cv_locale_zh_CN=none
124            fi
125          fi
126          ;;
127      esac
128    else
129      # If there was a link error, due to mblen(), the system is so old that
130      # it certainly doesn't have a chinese locale.
131      gt_cv_locale_zh_CN=none
132    fi
133    rm -fr conftest*
134  ])
135  LOCALE_ZH_CN=$gt_cv_locale_zh_CN
136  AC_SUBST([LOCALE_ZH_CN])
137])
138