vsnprintf - formatted output to a string

Syntax	#include <stdarg.h> #include <stdio.h> int vsnprintf(char *s, size_t n, const char *format, va_list arg);
Description	#include <stdarg.h> #include <stdio.h> int vsnprintf(char *s, size_t n, const char *format, va_list arg); vsnprintf() formats data (characters, strings, numerical values)according to the specification in the format string and writes the data to the area to which s points. vsnprintf() is similar to the vsprintf() function. In contrast to vsprintf(), vsnprintf() only outputs up to the buffer limit specified by the n parameter. This prevents buffer overrun. n must not exceed INT_MAX in size. vsnprintf() outputs a maximum of n-1 characters and adds a NULL character (\0) at the end of the output. If n=0, nothing is output. vsnprintf() exists, analogous to vsprintf() , as an ASCII, IEEE and ASCII/IEEE function (cf. sections “IEEE floating-point arithmetic” and “ASCII encoding”). Parameters: See fprintf().
Return val.	< 0	n > INT_MAX or output error.
	= 0 .. n-1	It was possible to edit the output completely. The return value specifies the length of the output without the terminating NULL character.
	> n	It was not possible to edit the output completely. The return value specifies the length of the output without the terminating NULL character which a complete output would require.