[PATCH 1/1] include: vsnprintf should always write a null terminator.

[Yuxuan Shui]

From: Yuxuan Shui

---
 include/msvcrt/stdio.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/msvcrt/stdio.h b/include/msvcrt/stdio.h
index c402a9a299e..44c2b816c60 100644
--- a/include/msvcrt/stdio.h
+++ b/include/msvcrt/stdio.h
@@ -458,7 +458,11 @@ _ACRTIMP int __cdecl vsprintf_s(char*,size_t,const char*,va_list) __WINE_CRT_PRI
 _ACRTIMP int __cdecl _vsnprintf(char*,size_t,const char*,va_list) __WINE_CRT_PRINTF_ATTR(3, 0);
 static inline int vsnprintf(char *buffer, size_t size, const char *format, va_list args) __WINE_CRT_PRINTF_ATTR(3, 0);
 static inline int vsnprintf(char *buffer, size_t size, const char *format, va_list args)
-{ return _vsnprintf(buffer,size,format,args); }
+{
+    int r = _vsnprintf(buffer,size,format,args);
+    if (r>=size) buffer[size-1] = 0;
+    return r;
+}

_ACRTIMP int __cdecl _snscanf_l(const char*,size_t,const char*,_locale_t,...) __WINE_CRT_SCANF_ATTR(3, 5);
 _ACRTIMP int __cdecl _sscanf_l(const char *,const char*,_locale_t,...) __WINE_CRT_SCANF_ATTR(2, 4);