vsnprintf.c - vx32 - Local 9vx git repository for patches.
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       ---
       vsnprintf.c (2639B)
       ---
            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 
           37 #if defined(LIBC_SCCS) && !defined(lint)
           38 static char rcsid[] = "$OpenBSD: vsnprintf.c,v 1.5 1998/07/27 02:28:28 millert Exp $";
           39 #endif /* LIBC_SCCS and not lint */
           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         int ret;
           52         char dummy;
           53         FILE f;
           54 
           55         /* While snprintf(3) specifies size_t stdio uses an int internally */
           56         if (n > INT_MAX)
           57                 n = INT_MAX;
           58         /* Stdio internals do not deal correctly with zero length buffer */
           59         if (n == 0) {
           60                 str = &dummy;
           61                 n = 1;
           62         }
           63         f._file = -1;
           64         f._flags = __SWR | __SSTR;
           65         f._bf._base = f._p = (unsigned char *)str;
           66         f._bf._size = f._w = n - 1;
           67         ret = vfprintf(&f, fmt, ap);
           68         *f._p = 0;
           69         return (ret);
           70 }