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vsnprintf.c revision 1.10 
      1 /*	$NetBSD: vsnprintf.c,v 1.10 1999/09/16 11:45:32 lukem Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)vsnprintf.c	8.1 (Berkeley) 6/4/93";
     43 #else
     44 __RCSID("$NetBSD: vsnprintf.c,v 1.10 1999/09/16 11:45:32 lukem Exp $");
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 #include "namespace.h"
     49 
     50 #include <assert.h>
     51 #include <errno.h>
     52 #include <stdio.h>
     53 
     54 #ifdef __weak_alias
     55 __weak_alias(vsnprintf,_vsnprintf);
     56 #endif
     57 
     58 int
     59 vsnprintf(str, n, fmt, ap)
     60 	char *str;
     61 	size_t n;
     62 	const char *fmt;
     63 	_BSD_VA_LIST_ ap;
     64 {
     65 	int ret;
     66 	FILE f;
     67 
     68 	_DIAGASSERT(str != NULL);
     69 	_DIAGASSERT(fmt != NULL);
     70 #ifdef _DIAGNOSTIC
     71 	if (str == NULL || fmt == NULL) {
     72 		errno = EFAULT;
     73 		return (-1);
     74 	}
     75 #endif
     76 
     77 	if ((int)n < 1)
     78 		return (-1);
     79 	f._flags = __SWR | __SSTR;
     80 	f._bf._base = f._p = (unsigned char *)str;
     81 	f._bf._size = f._w = n - 1;
     82 	ret = vfprintf(&f, fmt, ap);
     83 	*f._p = 0;
     84 	return (ret);
     85 }
     86