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This function is similar to sprintf, but it will print at most @var{n}

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

characters.  On error the return value is -1, otherwise it returns the

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

number of characters that would have been printed had @var{n} been

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

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

On error the return value is -1, otherwise it returns the number of

some pre-C99 system libraries do not implement this correctly so users

bytes, not including the terminating null byte, that would have been

cannot generally rely on the return value if the system version of

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

this function is used.

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