2.11BSD/src/lib/libc/stdio/vsprintf.c

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)vsprintf.c	5.2.1 (2.11BSD) 1995/04/02";
#endif /* LIBC_SCCS and not lint */

#include <stdio.h>
#include <varargs.h>

int
vsprintf(str, fmt, ap)
	char *str, *fmt;
	va_list ap;
{
	FILE f;

	f._flag = _IOWRT+_IOSTRG;
	f._ptr = str;
	f._cnt = 32767;
	_doprnt(fmt, ap, &f);
	*f._ptr = 0;
	return (f._ptr - str);
}