Mercurial > gnulib
view m4/wmemcpy.m4 @ 40212:8da9577294da
unistr/*, uniconv/*: Fix undefined behaviour.
Reported by Jeffrey Walton <noloader@gmail.com>.
* lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size.
* lib/unistr/u-cpy-alloc.h (FUNC): Likewise.
* lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise.
* lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Sat, 09 Mar 2019 00:01:47 +0100 |
parents | b06060465f09 |
children |
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# wmemcpy.m4 serial 3 dnl Copyright (C) 2011-2019 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_WMEMCPY], [ AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files dnl provide this function as an inline function definition. AC_CACHE_CHECK([for wmemcpy], [gl_cv_func_wmemcpy], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[ /* 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> ]], [[return ! wmemcpy ((wchar_t *) 0, (const wchar_t *) 0, 0);]]) ], [gl_cv_func_wmemcpy=yes], [gl_cv_func_wmemcpy=no]) ]) if test $gl_cv_func_wmemcpy = no; then HAVE_WMEMCPY=0 fi ])