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      1 /*  $NetBSD: vsnprintf.c,v 1.20 2005/02/09 21:35:47 kleink 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. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 #include  <LibConfig.h>
     35 #include <sys/EfiCdefs.h>
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";
     39 #else
     40 __RCSID("$NetBSD: vsnprintf.c,v 1.20 2005/02/09 21:35:47 kleink Exp $");
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 
     46 #include <assert.h>
     47 #include <errno.h>
     48 #include <stdio.h>
     49 #include "reentrant.h"
     50 #include "local.h"
     51 
     52 #ifdef __weak_alias
     53 __weak_alias(vsnprintf,_vsnprintf)
     54 #endif
     55 
     56 int
     57 vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
     58 {
     59   int ret;
     60   FILE f;
     61   struct __sfileext fext;
     62   unsigned char dummy[1];
     63 
     64   _DIAGASSERT(n == 0 || str != NULL);
     65   _DIAGASSERT(fmt != NULL);
     66 
     67   if ((int)n < 0) {
     68     errno = EINVAL;
     69     return (-1);
     70   }
     71 
     72   _FILEEXT_SETUP(&f, &fext);
     73   f._file = -1;
     74   f._flags = __SWR | __SSTR;
     75   if (n == 0) {
     76     f._bf._base = f._p = dummy;
     77     f._bf._size = f._w = 0;
     78   } else {
     79     f._bf._base = f._p = (unsigned char *)str;
     80     f._bf._size = f._w = (int)(n - 1);
     81   }
     82   ret = __vfprintf_unlocked(&f, fmt, ap);
     83   *f._p = 0;
     84   return (ret);
     85 }
     86