msvcrt: Old versions of _vsnprintf() treat the size as a signed int.

When they see -1 they consider that the buffer is too small and return an error. So impose a 2 GB limit on sprintf() for backward compatibility with XP and 2003. Signed-off-by: Francois Gouget <fgouget@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

msvcrt: Old versions of _vsnprintf() treat the size as a signed int.
c2404ba3 · Francois Gouget · Alexandre Julliard · 7df0f4a1 · c2404ba3
Commit c2404ba3 authored Feb 20, 2020 by Francois Gouget Committed by Alexandre Julliard Feb 21, 2020
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stdio.h include/msvcrt/stdio.h +1 -1

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--- a/include/msvcrt/stdio.h
+++ b/include/msvcrt/stdio.h
@@ -286,7 +286,7 @@ static inline int WINAPIV sprintf(char *buffer, const char *format, ...)
    __ms_va_list args;

    __ms_va_start(args, format);
-    ret = _vsnprintf(buffer, (size_t)-1, format, args);
+    ret = _vsnprintf(buffer, (size_t)_CRT_INT_MAX, format, args);
    __ms_va_end(args);
    return ret;
 }