vscnprintf(9) [centos man page]
VSCNPRINTF(9) Basic C Library Functions VSCNPRINTF(9) NAME
vscnprintf - Format a string and place it in a buffer SYNOPSIS
int vscnprintf(char * buf, size_t size, const char * fmt, va_list args); ARGUMENTS
buf The buffer to place the result into size The size of the buffer, including the trailing null space fmt The format string to use args Arguments for the format string DESCRIPTION
The return value is the number of characters which have been written into the buf not including the trailing '