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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)snprintf.c 8.1 (Berkeley) 6/4/93 33 * $FreeBSD: src/lib/libc/stdio/snprintf.c,v 1.22 2008/04/17 22:17:54 jhb Exp $ 34 * $DragonFly: src/lib/libc/stdio/snprintf.c,v 1.7 2006/03/02 18:05:30 joerg Exp $ 35 */ 36 37 #include <limits.h> 38 #include <stdio.h> 39 #include <stdarg.h> 40 41 #include "local.h" 42 #include "priv_stdio.h" 43 44 int 45 snprintf(char * __restrict str, size_t n, const char * __restrict fmt, ...) 46 { 47 size_t on; 48 int ret; 49 va_list ap; 50 FILE f; 51 52 on = n; 53 if (n != 0) 54 n--; 55 if (n > INT_MAX) 56 n = INT_MAX; 57 va_start(ap, fmt); 58 f.pub._fileno = -1; 59 f.pub._flags = __SWR | __SSTR; 60 f._bf._base = f.pub._p = (unsigned char *)str; 61 f._bf._size = f.pub._w = n; 62 memset(WCIO_GET(&f), 0, sizeof(struct wchar_io_data)); 63 ret = __vfprintf(&f, fmt, ap); 64 if (on > 0) 65 *f.pub._p = '\0'; 66 va_end(ap); 67 return (ret); 68 } 69