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# wcwidth.m4 serial 23
dnl Copyright (C) 2006-2017 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.
AC_DEFUN([gl_FUNC_WCWIDTH],
[
AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <wchar.h> to declare wcwidth().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gt_TYPE_WCHAR_T])
AC_REQUIRE([gt_TYPE_WINT_T])
AC_CHECK_HEADERS_ONCE([wchar.h])
AC_CHECK_FUNCS_ONCE([wcwidth])
AC_CHECK_DECLS([wcwidth], [], [], [[
/* AIX 3.2.5 declares wcwidth in <string.h>. */
#include <string.h>
/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
<wchar.h>.
BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
before <wchar.h>. */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <wchar.h>
]])
if test $ac_cv_have_decl_wcwidth != yes; then
HAVE_DECL_WCWIDTH=0
fi
if test $ac_cv_func_wcwidth = yes; then
HAVE_WCWIDTH=1
dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1.
dnl On OpenBSD 5.0, wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1.
dnl On OSF/1 5.1, wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1.
dnl On OpenBSD 5.8, wcwidth(0xFF1A) (FULLWIDTH COLON) returns 0.
dnl This leads to bugs in 'ls' (coreutils).
AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales],
[gl_cv_func_wcwidth_works],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <locale.h>
/* AIX 3.2.5 declares wcwidth in <string.h>. */
#include <string.h>
/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
<wchar.h>.
BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
before <wchar.h>. */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <wchar.h>
#if !HAVE_DECL_WCWIDTH
extern
# ifdef __cplusplus
"C"
# endif
int wcwidth (int);
#endif
int main ()
{
int result = 0;
if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL)
{
if (wcwidth (0x0301) > 0)
result |= 1;
if (wcwidth (0x05B0) > 0)
result |= 2;
if (wcwidth (0x200B) > 0)
result |= 4;
if (wcwidth (0xFF1A) == 0)
result |= 8;
}
return result;
}]])],
[gl_cv_func_wcwidth_works=yes],
[gl_cv_func_wcwidth_works=no],
[
changequote(,)dnl
case "$host_os" in
# Guess yes on glibc and AIX 7 systems.
*-gnu* | aix[7-9]*) gl_cv_func_wcwidth_works="guessing yes";;
*) gl_cv_func_wcwidth_works="guessing no";;
esac
changequote([,])dnl
])
])
case "$gl_cv_func_wcwidth_works" in
*yes) ;;
*no) REPLACE_WCWIDTH=1 ;;
esac
else
HAVE_WCWIDTH=0
fi
dnl We don't substitute HAVE_WCWIDTH. We assume that if the system does not
dnl have the wcwidth function, then it does not declare it.
])
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