1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * Copyright (c) 2011 The FreeBSD Foundation 11 * 12 * Portions of this software were developed by David Chisnall 13 * under sponsorship from the FreeBSD Foundation. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #if defined(LIBC_SCCS) && !defined(lint) 41 static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93"; 42 #endif /* LIBC_SCCS and not lint */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <errno.h> 47 #include <limits.h> 48 #include <stdio.h> 49 #include "local.h" 50 #include "xlocale_private.h" 51 52 int 53 vsnprintf_l(char * __restrict str, size_t n, locale_t locale, 54 const char * __restrict fmt, __va_list ap) 55 { 56 size_t on; 57 int ret; 58 char dummy[2]; 59 FILE f = FAKE_FILE; 60 FIX_LOCALE(locale); 61 62 on = n; 63 if (n != 0) 64 n--; 65 if (n > INT_MAX) { 66 errno = EOVERFLOW; 67 *str = '\0'; 68 return (EOF); 69 } 70 /* Stdio internals do not deal correctly with zero length buffer */ 71 if (n == 0) { 72 if (on > 0) 73 *str = '\0'; 74 str = dummy; 75 n = 1; 76 } 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, locale, fmt, ap); 81 if (on > 0) 82 *f._p = '\0'; 83 return (ret); 84 } 85 int 86 vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt, 87 __va_list ap) 88 { 89 return vsnprintf_l(str, n, __get_locale(), fmt, ap); 90 } 91