Manuale C
#include <stdio.h>
int snprintf(char* buffer, size_t nsize, const char* fmt, ...);
Description :
Sends formatted output to a buffer of a maximum length specified by nsize.
If the number of bytes to output is:
< nsize, then all of the characters have been written, including the terminating ‘\0’ character.
== nsize, then nsize characters are written, with no terminating ‘\0’ character.
> nsize, then only nsize characters are written, with no terminating ‘\0’ character.
If nsize is 0, then the string will not be written to (and may be NULL).
Return Value
Number of bytes output, or, if nsize is 0, the number of bytes needed, not including the terminating ‘\0’ character.