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 * @(#)snprintf.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: src/lib/libc/stdio/snprintf.c,v 1.12 1999/08/28 00:01:16 peter Exp $ 38 * $DragonFly: src/lib/libc/stdio/snprintf.c,v 1.2 2003/06/17 04:26:46 dillon Exp $ 39 */ 40 41 #include <limits.h> 42 #include <stdio.h> 43 #if __STDC__ 44 #include <stdarg.h> 45 #else 46 #include <varargs.h> 47 #endif 48 49 #if __STDC__ 50 int 51 snprintf(char *str, size_t n, char const *fmt, ...) 52 #else 53 int 54 snprintf(str, n, fmt, va_alist) 55 char *str; 56 size_t n; 57 char *fmt; 58 va_dcl 59 #endif 60 { 61 size_t on; 62 int ret; 63 va_list ap; 64 FILE f; 65 66 on = n; 67 if (n != 0) 68 n--; 69 if (n > INT_MAX) 70 n = INT_MAX; 71 #if __STDC__ 72 va_start(ap, fmt); 73 #else 74 va_start(ap); 75 #endif 76 f._file = -1; 77 f._flags = __SWR | __SSTR; 78 f._bf._base = f._p = (unsigned char *)str; 79 f._bf._size = f._w = n; 80 ret = vfprintf(&f, fmt, ap); 81 if (on > 0) 82 *f._p = '\0'; 83 va_end(ap); 84 return (ret); 85 } 86