mbrtowc.m4

来自「gnu tar 源码包。 tar 软件是 Unix 系统下的一个打包软件」· M4 代码 · 共 32 行

# mbrtowc.m4 serial 8
dnl Copyright (C) 2001-2002, 2004-2005 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 From Paul Eggert

dnl This file can be removed, and gl_FUNC_MBRTOWC replaced with
dnl AC_FUNC_MBRTOWC, when autoconf 2.60 can be assumed everywhere.

AC_DEFUN([gl_FUNC_MBRTOWC],
[
  dnl Same as AC_FUNC_MBRTOWC in autoconf-2.60.
  AC_CACHE_CHECK([whether mbrtowc and mbstate_t are properly declared],
    gl_cv_func_mbrtowc,
    [AC_LINK_IFELSE(
       [AC_LANG_PROGRAM(
            [[#include <wchar.h>]],
            [[wchar_t wc;
              char const s[] = "";
              size_t n = 1;
              mbstate_t state;
              return ! (sizeof state && (mbrtowc) (&wc, s, n, &state));]])],
       gl_cv_func_mbrtowc=yes,
       gl_cv_func_mbrtowc=no)])
  if test $gl_cv_func_mbrtowc = yes; then
    AC_DEFINE([HAVE_MBRTOWC], 1,
      [Define to 1 if mbrtowc and mbstate_t are properly declared.])
  fi
])