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This function is similar to vsprintf, but it will print at most

This function is similar to @code{vsprintf}, but it will write to

@var{n} characters.  On error the return value is -1, otherwise it

@var{buf} at most @code{@var{n}-1} bytes of text, followed by a

returns the number of characters that would have been printed had

terminating null byte, for a total of @var{n} bytes.  On error the

@var{n} been sufficiently large, regardless of the actual value of

return value is -1, otherwise it returns the number of characters that

@var{n}.  Note some pre-C99 system libraries do not implement this

would have been printed had @var{n} been sufficiently large,

correctly so users cannot generally rely on the return value if the

regardless of the actual value of @var{n}.  Note some pre-C99 system

system version of this function is used.

libraries do not implement this correctly so users cannot generally