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 #if 0 39 static char sccsid[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <limits.h> 46 #include <stdio.h> 47 #if __STDC__ 48 #include <stdarg.h> 49 #else 50 #include <varargs.h> 51 #endif 52 53 #include "local.h" 54 55 #if __STDC__ 56 int 57 snprintf(char *str, size_t n, char const *fmt, ...) 58 #else 59 int 60 snprintf(str, n, fmt, va_alist) 61 char *str; 62 size_t n; 63 char *fmt; 64 va_dcl 65 #endif 66 { 67 size_t on; 68 int ret; 69 va_list ap; 70 FILE f; 71 72 on = n; 73 if (n != 0) 74 n--; 75 if (n > INT_MAX) 76 n = INT_MAX; 77 #if __STDC__ 78 va_start(ap, fmt); 79 #else 80 va_start(ap); 81 #endif 82 f._file = -1; 83 f._flags = __SWR | __SSTR; 84 f._bf._base = f._p = (unsigned char *)str; 85 f._bf._size = f._w = n; 86 ret = __vfprintf(&f, fmt, ap); 87 if (on > 0) 88 *f._p = '\0'; 89 va_end(ap); 90 return (ret); 91 } 92