/* * Throughout the book I use snprintf() because it's safer than sprintf(). * But as of the time of this writing, not all systems provide this * function.  The function below should only be built on those systems * that do not provide a real snprintf(). * The function below just acts like sprintf(); it is not safe, but it * tries to detect overflow. */#include	"unp.h"#include	<stdarg.h>		/* ANSI C header file */intsnprintf(char *buf, size_t size, const char *fmt, ...){	int			n;	va_list		ap;	va_start(ap, fmt);	vsprintf(buf, fmt, ap);	/* Sigh, some vsprintf's return ptr, not length */	n = strlen(buf);	va_end(ap);	if (n >= size)		err_quit("snprintf: '%s' overflowed array", fmt);	return(n);}