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 * Copyright (c) 2011 The FreeBSD Foundation 9 * All rights reserved. 10 * Portions of this software were developed by David Chisnall 11 * under sponsorship from the FreeBSD Foundation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)vsnprintf.c 8.1 (Berkeley) 6/4/93 38 * $FreeBSD: head/lib/libc/stdio/vsnprintf.c 249808 2013-04-23 13:33:13Z emaste $ 39 */ 40 41 42 #include <errno.h> 43 #include <limits.h> 44 #include <pthread.h> /* for FAKE_FILE PTHREAD_MUTEX_INITIALIZER */ 45 #include <stdio.h> 46 #include "local.h" 47 #include "xlocale_private.h" 48 49 int 50 vsnprintf_l(char * __restrict str, size_t n, locale_t locale, 51 const char * __restrict fmt, __va_list ap) 52 { 53 size_t on; 54 int ret; 55 char dummy[2]; 56 FILE f = FAKE_FILE; 57 FIX_LOCALE(locale); 58 59 on = n; 60 if (n != 0) 61 n--; 62 if (n > INT_MAX) { 63 errno = EOVERFLOW; 64 *str = '\0'; 65 return (EOF); 66 } 67 /* Stdio internals do not deal correctly with zero length buffer */ 68 if (n == 0) { 69 if (on > 0) 70 *str = '\0'; 71 str = dummy; 72 n = 1; 73 } 74 f.pub._flags = __SWR | __SSTR; 75 f._bf._base = f.pub._p = (unsigned char *)str; 76 f._bf._size = f.pub._w = n; 77 ret = __vfprintf(&f, locale, fmt, ap); 78 if (on > 0) 79 *f.pub._p = '\0'; 80 return (ret); 81 } 82 int 83 vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt, 84 __va_list ap) 85 { 86 return vsnprintf_l(str, n, __get_locale(), fmt, ap); 87 } 88