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#include <stdio.h> #include <stdarg.h> int vsnprintf (char *buffer, size_t n, const char *format, va_list ap);
This function works similarly to
vsprintf() (see section vsprintf), but
the size n of the buffer is also taken into account. This
function will write n - 1 characters. The nth character is used
for the terminating nul. If n is zero, buffer is not touched.
The number of characters that would have been written (excluding the trailing nul) is returned; otherwise -1 is returned to flag encoding or buffer space errors.
The maximum accepted value of n is
<limits.h>. -1 is returned and
errno is set to
EFBIG, if n is greater than this limit.
|ANSI/ISO C||C89; C99 (see note 1)|
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