vprintf.c

操作系统SunOS 4.1.3版本的源码

#if !defined(lint) && defined(SCCSIDS)
static	char sccsid[] = "@(#)vprintf.c 1.1 92/07/30 SMI"; /* from S5R2 1.1 */
#endif

/*LINTLIBRARY*/
#include <stdio.h>
#include <varargs.h>

extern int _doprnt();

/*VARARGS1*/
int
vprintf(format, ap)
char *format;
va_list ap;
{
	if (!(stdout->_flag & _IOWRT)) {
		/* if no write flag */
		if (stdout->_flag & _IORW) {
			/* if ok, cause read-write */
			stdout->_flag |= _IOWRT;
		} else {
			/* else error */
			return EOF;
		}
	}
	return(_doprnt(format, ap, stdout));
}