> From: Dongsheng Song [mailto:dongsheng.s...@gmail.com]
> Sent: Tuesday, March 08, 2011 5:56 PM
> To: Dock, Dion
> Cc: mingw-w64-public@lists.sourceforge.net
> Subject: Re: [Mingw-w64-public] why aren't "secure" _s functions provided?
>
> On Wed, Mar 9, 2011 at 03:32, Dock, Dion <dion_d...@mentor.com> wrote:
>
> I'm back to my original question: can I use MinGW64 with source that has
> functions like strnlen_s?
>
> It sounds like the answer is: I can compile code with those functions in a
> DLL with a manifest for msvcr80 (or 90 or 100) or statically link the runtime
> into that > DLL. However, I cannot compile code with those functions using
> MinGW64.
>
> Or to put it another way, how would you get this to compile with MinGW64?
> #include <stdio.h>
> #include <string.h>
>
> int main()
> {
> printf("%d\n", strnlen_s("foo", 2)); /* expect 2 */
> return 0;
> }
>
> Here's what I get:
> C:\Temp>C:\mingw_32\bin\i686-w64-mingw32-gcc.exe main.c
> C:\Users\dockd\AppData\Local\Temp\ccKqFt47.o:main.c:(.text+0x1e): undefined
> reference to `strnlen_s'
> collect2: ld returned 1 exit status
>
> -Dion
>
> It seems that you can compile your program, so you can copy msvcr100.dll to
> libmsvcrt.a, it should works fine.
> Or link with: gcc test.c -lmsvcr100
>
> But I checked the functions in msvcr100.dll, no strnlen_s, only have the
> following string functions:
>
> strcat_s
> strcpy_s
> _strdate_s
> _strerror_s
> strerror_s
> _strlwr_s
> strncat_s
> strncpy_s
> _strnset_s
> _strset_s
> _strtime_s
> strtok_s
> _strupr_s
How did you do that? nm isn't displaying those functions in my preferred
runtime lib, libmsvcr80.a. For example,
C:\Temp>C:\mingw_32\bin\i686-w64-mingw32-nm.exe
C:\mingw_32\mingw\lib\libmsvcr80.a | find "strcpy_s"
C:\Temp>
>
> When I check VC 10, I found it's a inline function:
>
> #if __STDC_WANT_SECURE_LIB__ && !defined (__midl)
> _Check_return_ static __inline size_t __CRTDECL strnlen_s(_In_z_ const char
> * _Str, _In_ size_t _MaxCount)
> {
> return (_Str==0) ? 0 : strnlen(_Str, _MaxCount);
> }
>
> _Check_return_ static __inline size_t __CRTDECL wcsnlen_s(_In_z_ const
> wchar_t * _Src, _In_ size_t _MaxCount)
> {
> return (_Src == NULL) ? 0 : wcsnlen(_Src, _MaxCount);
> }
> #endif
>
> So if you want use "secure" _s functions, you can link with -lmsvcr100, but
> please do not use strnlen_s/wcsnlen_s,
> or you must define your self.
>
> --
> Dongsheng
Thanks! Adding the "-lmsvcr80" resolved a few of the symbols. Now I've hit
the next stumbling block: vsnprintf_s and localtime32_s.
These don't seem to be in libmsvcr80.a, but per the above, I'm not sure how to
check for their presence. Neither is a macro, however.
-Dion
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