vfprintf.c revision 3839e65723771b85975f4263102dd3ceec4523c 
1/*
2 * Copyright (c) 1988 Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley.  The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static char sccsid[] = "@(#)vfprintf.c	5.2 (Berkeley) 6/27/88";
20#endif /* LIBC_SCCS and not lint */
21
22#include <stdio.h>
23#include <varargs.h>
24
25int
26vfprintf(iop, fmt, ap)
27	FILE *iop;
28	char *fmt;
29	va_list ap;
30{
31	int len;
32	char localbuf[BUFSIZ];
33
34	if (iop->_flag & _IONBF) {
35		iop->_flag &= ~_IONBF;
36		iop->_ptr = iop->_base = localbuf;
37		len = _doprnt(fmt, ap, iop);
38		(void) fflush(iop);
39		iop->_flag |= _IONBF;
40		iop->_base = NULL;
41		iop->_bufsiz = 0;
42		iop->_cnt = 0;
43	} else
44		len = _doprnt(fmt, ap, iop);
45
46	return (ferror(iop) ? EOF : len);
47}
48