File:  [DragonFly] / src / lib / libc / stdio / vsnprintf.c
Revision 1.2: download - view: text, annotated - select for diffs
Tue Jun 17 04:26:46 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
CVS tags: HEAD
Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids.  Most
ids have been removed from !lint sections and moved into comment sections.

    1: /*-
    2:  * Copyright (c) 1990, 1993
    3:  *	The Regents of the University of California.  All rights reserved.
    4:  *
    5:  * This code is derived from software contributed to Berkeley by
    6:  * Chris Torek.
    7:  *
    8:  * Redistribution and use in source and binary forms, with or without
    9:  * modification, are permitted provided that the following conditions
   10:  * are met:
   11:  * 1. Redistributions of source code must retain the above copyright
   12:  *    notice, this list of conditions and the following disclaimer.
   13:  * 2. Redistributions in binary form must reproduce the above copyright
   14:  *    notice, this list of conditions and the following disclaimer in the
   15:  *    documentation and/or other materials provided with the distribution.
   16:  * 3. All advertising materials mentioning features or use of this software
   17:  *    must display the following acknowledgement:
   18:  *	This product includes software developed by the University of
   19:  *	California, Berkeley and its contributors.
   20:  * 4. Neither the name of the University nor the names of its contributors
   21:  *    may be used to endorse or promote products derived from this software
   22:  *    without specific prior written permission.
   23:  *
   24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34:  * SUCH DAMAGE.
   35:  *
   36:  * @(#)vsnprintf.c	8.1 (Berkeley) 6/4/93
   37:  * $FreeBSD: src/lib/libc/stdio/vsnprintf.c,v 1.12.2.1 2002/09/23 06:58:17 maxim Exp $
   38:  * $DragonFly: src/lib/libc/stdio/vsnprintf.c,v 1.2 2003/06/17 04:26:46 dillon Exp $
   39:  */
   40: 
   41: #include <limits.h>
   42: #include <stdio.h>
   43: 
   44: int
   45: vsnprintf(str, n, fmt, ap)
   46: 	char *str;
   47: 	size_t n;
   48: 	const char *fmt;
   49: 	_BSD_VA_LIST_ ap;
   50: {
   51: 	size_t on;
   52: 	int ret;
   53: 	char dummy;
   54: 	FILE f;
   55: 
   56: 	on = n;
   57: 	if (n != 0)
   58: 		n--;
   59: 	if (n > INT_MAX)
   60: 		n = INT_MAX;
   61: 	/* Stdio internals do not deal correctly with zero length buffer */
   62: 	if (n == 0) {
   63:                 str = &dummy;
   64:                 n = 1;
   65: 	}
   66: 	f._file = -1;
   67: 	f._flags = __SWR | __SSTR;
   68: 	f._bf._base = f._p = (unsigned char *)str;
   69: 	f._bf._size = f._w = n;
   70: 	ret = vfprintf(&f, fmt, ap);
   71: 	if (on > 0)
   72: 		*f._p = '\0';
   73: 	return (ret);
   74: }