| # wcwidth.m4 serial 30 |
| dnl Copyright (C) 2006-2019 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 |
| AC_CACHE_CHECK([whether wcwidth is a macro], |
| [gl_cv_func_wcwidth_macro], |
| [AC_EGREP_CPP([wchar_header_defines_wcwidth], [ |
| #include <wchar.h> |
| #ifdef wcwidth |
| wchar_header_defines_wcwidth |
| #endif], |
| [gl_cv_func_wcwidth_macro=yes], |
| [gl_cv_func_wcwidth_macro=no]) |
| ]) |
| fi |
| |
| if test $ac_cv_func_wcwidth = yes || test $gl_cv_func_wcwidth_macro = yes; then |
| HAVE_WCWIDTH=1 |
| dnl On Mac OS X 10.3, wcwidth(0x0301) (COMBINING ACUTE ACCENT) returns 1. |
| dnl On OpenBSD 5.0, wcwidth(0x05B0) (HEBREW POINT SHEVA) returns 1. |
| dnl On OSF/1 5.1, wcwidth(0x200B) (ZERO WIDTH SPACE) returns 1. |
| dnl On OpenBSD 5.8, wcwidth(0xFF1A) (FULLWIDTH COLON) returns 0. |
| dnl This leads to bugs in 'ls' (coreutils). |
| dnl On Solaris 11.4, wcwidth(0x2202) (PARTIAL DIFFERENTIAL) returns 2, |
| dnl even in Western locales. |
| AC_CACHE_CHECK([whether wcwidth works reasonably in UTF-8 locales], |
| [gl_cv_func_wcwidth_works], |
| [ |
| AC_RUN_IFELSE( |
| [AC_LANG_SOURCE([[ |
| #include <locale.h> |
| /* AIX 3.2.5 declares wcwidth in <string.h>. */ |
| #include <string.h> |
| /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before |
| <wchar.h>. |
| BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included |
| before <wchar.h>. */ |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <time.h> |
| #include <wchar.h> |
| #if !HAVE_DECL_WCWIDTH |
| extern |
| # ifdef __cplusplus |
| "C" |
| # endif |
| int wcwidth (int); |
| #endif |
| int main () |
| { |
| int result = 0; |
| if (setlocale (LC_ALL, "en_US.UTF-8") != NULL) |
| { |
| if (wcwidth (0x0301) > 0) |
| result |= 1; |
| if (wcwidth (0x05B0) > 0) |
| result |= 2; |
| if (wcwidth (0x200B) > 0) |
| result |= 4; |
| if (wcwidth (0xFF1A) == 0) |
| result |= 8; |
| if (wcwidth (0x2202) > 1) |
| result |= 16; |
| } |
| return result; |
| }]])], |
| [gl_cv_func_wcwidth_works=yes], |
| [gl_cv_func_wcwidth_works=no], |
| [ |
| changequote(,)dnl |
| case "$host_os" in |
| # Guess yes on glibc systems. |
| *-gnu* | gnu*) gl_cv_func_wcwidth_works="guessing yes";; |
| # Guess yes on musl systems. |
| *-musl*) gl_cv_func_wcwidth_works="guessing yes";; |
| # Guess yes on AIX 7 systems. |
| aix[7-9]*) gl_cv_func_wcwidth_works="guessing yes";; |
| *) gl_cv_func_wcwidth_works="$gl_cross_guess_normal";; |
| esac |
| changequote([,])dnl |
| ]) |
| ]) |
| case "$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. |
| ]) |
| |
| # Prerequisites of lib/wcwidth.c. |
| AC_DEFUN([gl_PREREQ_WCWIDTH], [ |
| AC_REQUIRE([AC_C_INLINE]) |
| : |
| ]) |