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stdarg: start a new va block when reusing arguments #351

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lonemadmax
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WARNING: I don't have any of the affected systems, so I have not even compiled this.

@miniupnp
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what's the point ?

@lonemadmax
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When you call the first vfprintf/vsnprintf/whatever the va_list may (depending on implementation) have advanced to the end of argument list, and the second call would continue out of that list, with null pointers, random garbage or a segment violation.

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