Prevent undefined behavior in Windows vasprintf#2630
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metsw24-max wants to merge 1 commit intofacebook:mainfrom
Open
Prevent undefined behavior in Windows vasprintf#2630metsw24-max wants to merge 1 commit intofacebook:mainfrom
metsw24-max wants to merge 1 commit intofacebook:mainfrom
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The Windows vasprintf implementation reused a consumed va_list across two vsnprintf calls, which is invalid and can produce incorrect output or crashes. Use va_copy for each call to ensure correct behavior.
Also avoid assigning to *dest before success to prevent returning a pointer on failure.