-# mbrtowc.m4 serial 22
-dnl Copyright (C) 2001-2002, 2004-2005, 2008-2011 Free Software Foundation,
+# mbrtowc.m4 serial 26
+dnl Copyright (C) 2001-2002, 2004-2005, 2008-2015 Free Software Foundation,
dnl Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
AC_CHECK_FUNCS_ONCE([mbrtowc])
if test $ac_cv_func_mbrtowc = no; then
HAVE_MBRTOWC=0
+ AC_CHECK_DECLS([mbrtowc],,, [[
+/* 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_mbrtowc = yes; then
+ dnl On Minix 3.1.8, the system's <wchar.h> declares mbrtowc() although
+ dnl it does not have the function. Avoid a collision with gnulib's
+ dnl replacement.
+ REPLACE_MBRTOWC=1
+ fi
else
if test $REPLACE_MBSTATE_T = 1; then
REPLACE_MBRTOWC=1
gl_MBRTOWC_NULL_ARG2
gl_MBRTOWC_RETVAL
gl_MBRTOWC_NUL_RETVAL
+ gl_MBRTOWC_EMPTY_INPUT
case "$gl_cv_func_mbrtowc_null_arg1" in
*yes) ;;
*) AC_DEFINE([MBRTOWC_NULL_ARG1_BUG], [1],
REPLACE_MBRTOWC=1
;;
esac
+ case "$gl_cv_func_mbrtowc_empty_input" in
+ *yes) ;;
+ *) AC_DEFINE([MBRTOWC_EMPTY_INPUT_BUG], [1],
+ [Define if the mbrtowc function does not return (size_t) -2
+ for empty input.])
+ REPLACE_MBRTOWC=1
+ ;;
+ esac
fi
fi
- if test $HAVE_MBRTOWC = 0 || test $REPLACE_MBRTOWC = 1; then
- gl_REPLACE_WCHAR_H
- AC_LIBOBJ([mbrtowc])
- gl_PREREQ_MBRTOWC
- fi
])
dnl Test whether mbsinit() and mbrtowc() need to be overridden in a way that
else
REPLACE_MBSTATE_T=1
fi
- if test $REPLACE_MBSTATE_T = 1; then
- gl_REPLACE_WCHAR_H
- fi
])
dnl Test whether mbrtowc puts the state into non-initial state when parsing an
])
])
+dnl Test whether mbrtowc returns the correct value on empty input.
+
+AC_DEFUN([gl_MBRTOWC_EMPTY_INPUT],
+[
+ AC_REQUIRE([AC_PROG_CC])
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
+ AC_CACHE_CHECK([whether mbrtowc works on empty input],
+ [gl_cv_func_mbrtowc_empty_input],
+ [
+ dnl Initial guess, used when cross-compiling or when no suitable locale
+ dnl is present.
+changequote(,)dnl
+ case "$host_os" in
+ # Guess no on AIX and glibc systems.
+ aix* | *-gnu*)
+ gl_cv_func_mbrtowc_empty_input="guessing no" ;;
+ *) gl_cv_func_mbrtowc_empty_input="guessing yes" ;;
+ esac
+changequote([,])dnl
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE([[
+ #include <wchar.h>
+ static wchar_t wc;
+ static mbstate_t mbs;
+ int
+ main (void)
+ {
+ return mbrtowc (&wc, "", 0, &mbs) == (size_t) -2;
+ }]])],
+ [gl_cv_func_mbrtowc_empty_input=no],
+ [gl_cv_func_mbrtowc_empty_input=yes],
+ [:])
+ ])
+])
+
# Prerequisites of lib/mbrtowc.c.
AC_DEFUN([gl_PREREQ_MBRTOWC], [
: