/* error.c - From Jon C. Snader: Effective TCP/IP Programming
 *           Addison-Wesley 2000
 *           For better understanding, read the excellent Snader book.
 */


#include "etcp.h"

char *program_name;

/* error - print a diagnostic and optionally quit.
           The "..." arguments are printed out using the format fmt.
           if "err" is a standard error number and not 0, the
           correspondin standard error message is printed out.
           If "status" is not 0, the program exits.
 */

void error( int status, int err, char *fmt, ... )
{
	va_list ap;

	va_start( ap, fmt );
	fprintf( stderr, "%s: ", program_name );
	vfprintf( stderr, fmt, ap );
	va_end( ap );
	if ( err )
		fprintf( stderr, ": %s (%d)\n", strerror( err ), err );
	if ( status )
		EXIT( status );
}