1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Chris Torek. 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 * @(#)snprintf.c 8.1 (Berkeley) 6/4/93 38 * $FreeBSD: head/lib/libc/stdio/snprintf.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 <stdarg.h> 47 #include "xlocale_private.h" 48 49 #include "local.h" 50 51 int 52 snprintf(char * __restrict str, size_t n, char const * __restrict fmt, ...) 53 { 54 size_t on; 55 int ret; 56 va_list ap; 57 FILE f = FAKE_FILE; 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 va_start(ap, fmt); 68 f.pub._flags = __SWR | __SSTR; 69 f._bf._base = f.pub._p = (unsigned char *)str; 70 f._bf._size = f.pub._w = n; 71 ret = __vfprintf(&f, __get_locale(), fmt, ap); 72 if (on > 0) 73 *f.pub._p = '\0'; 74 va_end(ap); 75 return (ret); 76 } 77 int 78 snprintf_l(char * __restrict str, size_t n, locale_t locale, 79 char const * __restrict fmt, ...) 80 { 81 size_t on; 82 int ret; 83 va_list ap; 84 FILE f = FAKE_FILE; 85 FIX_LOCALE(locale); 86 87 on = n; 88 if (n != 0) 89 n--; 90 if (n > INT_MAX) { 91 errno = EOVERFLOW; 92 *str = '\0'; 93 return (EOF); 94 } 95 va_start(ap, fmt); 96 f.pub._flags = __SWR | __SSTR; 97 f._bf._base = f.pub._p = (unsigned char *)str; 98 f._bf._size = f.pub._w = n; 99 ret = __vfprintf(&f, locale, fmt, ap); 100 if (on > 0) 101 *f.pub._p = '\0'; 102 va_end(ap); 103 return (ret); 104 } 105