Ultrix-3.1/src/libc/stdio/vfprintf.c

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*
 * SCCSID: @(#)vfprintf.c	3.0	4/22/86
 */
/*	(System 5)  vfprintf.c	1.1	*/
/*LINTLIBRARY*/
#include <stdio.h>
#include <varargs.h>

extern int _doprnt();

/*VARARGS2*/
int
vfprintf(iop, format, ap)
FILE *iop;
char *format;
va_list ap;
{
	register int count;

	if (!(iop->_flag | _IOWRT)) {
		/* if no write flag */
		if (iop->_flag | _IORW) {
			/* if ok, cause read-write */
			iop->_flag |= _IOWRT;
		} else {
			/* else error */
			return EOF;
		}
	}
	count = _doprnt(format, ap, iop);
	return(ferror(iop)? EOF: count);
}