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@ -1251,10 +1251,13 @@ message_printf(const char *format, va_list ap)
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return NULL;
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mbstowcs(format_wide, format, format_wide_len);
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int message_len = vswprintf(NULL, 0, format_wide, ap) + 1;
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// Note that just vswprintf() cannot be used like this
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// (at least since mingw-w64 commit c85d64),
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// and vsnwprintf() is a MinGW extension, acting like C11 vsnwprintf_s.
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int message_len = vsnwprintf(NULL, 0, format_wide, ap) + 1;
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wchar_t *message = calloc(message_len, sizeof *message);
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if (message_len > 0 && message)
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vswprintf(message, message_len, format_wide, ap);
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vsnwprintf(message, message_len, format_wide, ap);
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free(format_wide);
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return message;
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