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 <stdio.h> 45 #include <stdarg.h> 46 #include "xlocale_private.h" 47 48 #include "local.h" 49 50 int 51 snprintf(char * __restrict str, size_t n, char const * __restrict fmt, ...) 52 { 53 size_t on; 54 int ret; 55 va_list ap; 56 FILE f = FAKE_FILE; 57 58 on = n; 59 if (n != 0) 60 n--; 61 if (n > INT_MAX) { 62 errno = EOVERFLOW; 63 *str = '\0'; 64 return (EOF); 65 } 66 va_start(ap, fmt); 67 f.pub._flags = __SWR | __SSTR; 68 f._bf._base = f.pub._p = (unsigned char *)str; 69 f._bf._size = f.pub._w = n; 70 ret = __vfprintf(&f, __get_locale(), fmt, ap); 71 if (on > 0) 72 *f.pub._p = '\0'; 73 va_end(ap); 74 return (ret); 75 } 76 int 77 snprintf_l(char * __restrict str, size_t n, locale_t locale, 78 char const * __restrict fmt, ...) 79 { 80 size_t on; 81 int ret; 82 va_list ap; 83 FILE f = FAKE_FILE; 84 FIX_LOCALE(locale); 85 86 on = n; 87 if (n != 0) 88 n--; 89 if (n > INT_MAX) { 90 errno = EOVERFLOW; 91 *str = '\0'; 92 return (EOF); 93 } 94 va_start(ap, fmt); 95 f.pub._flags = __SWR | __SSTR; 96 f._bf._base = f.pub._p = (unsigned char *)str; 97 f._bf._size = f.pub._w = n; 98 ret = __vfprintf(&f, locale, fmt, ap); 99 if (on > 0) 100 *f.pub._p = '\0'; 101 va_end(ap); 102 return (ret); 103 } 104