1 files changed, 37 insertions, 0 deletions
diff --git a/m4/mbswidth.m4 b/m4/mbswidth.m4
new file mode 100644
index 0000000..b0a5d57
--- /dev/null
+++ b/m4/mbswidth.m4
@@ -0,0 +1,37 @@
+# mbswidth.m4 serial 19
+dnl Copyright (C) 2000-2002, 2004, 2006-2022 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 autoconf tests required for use of mbswidth.c
+dnl From Bruno Haible.
+
+AC_DEFUN([gl_MBSWIDTH],
+[
+  AC_CHECK_HEADERS_ONCE([wchar.h])
+  AC_CHECK_FUNCS_ONCE([isascii mbsinit])
+
+  dnl UnixWare 7.1.1 <wchar.h> has a declaration of a function mbswidth()
+  dnl that clashes with ours.
+  AC_CACHE_CHECK([whether mbswidth is declared in <wchar.h>],
+    [ac_cv_have_decl_mbswidth],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM(
+          [[#include <wchar.h>
+          ]],
+          [[char *p = (char *) mbswidth;
+            return !p;
+          ]])],
+       [ac_cv_have_decl_mbswidth=yes],
+       [ac_cv_have_decl_mbswidth=no])])
+  if test $ac_cv_have_decl_mbswidth = yes; then
+    ac_val=1
+  else
+    ac_val=0
+  fi
+  AC_DEFINE_UNQUOTED([HAVE_DECL_MBSWIDTH_IN_WCHAR_H], [$ac_val],
+    [Define to 1 if you have a declaration of mbswidth() in <wchar.h>, and to 0 otherwise.])
+
+  AC_TYPE_MBSTATE_T
+])