1 /* $NetBSD: vsnprintf.c,v 1.29 2017/01/12 18:16:52 christos Exp $ */ 2 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 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: vsnprintf.c,v 1.29 2017/01/12 18:16:52 christos Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 46 #include <assert.h> 47 #include <errno.h> 48 #include <locale.h> 49 #include <stdio.h> 50 #include "reentrant.h" 51 #include "setlocale_local.h" 52 #include "local.h" 53 54 #if __SSP_FORTIFY_LEVEL != 0 55 # undef vsnprintf 56 # define vsnprintf _vsnprintf 57 # undef snprintf 58 # define snprintf _snprintf 59 int snprintf(char * __restrict, size_t, const char * __restrict, ...) 60 __printflike(3, 4); 61 int vsnprintf(char * __restrict, size_t, const char * __restrict, 62 __va_list) __printflike(3, 0); 63 #endif 64 65 #ifdef __weak_alias 66 __weak_alias(vsnprintf,_vsnprintf) 67 __weak_alias(vsnprintf_l,_vsnprintf_l) 68 __weak_alias(snprintf,_snprintf) 69 __weak_alias(snprintf_l,_snprintf_l) 70 #endif 71 72 int 73 vsnprintf_l(char *str, size_t n, locale_t loc, const char *fmt, va_list ap) 74 { 75 int ret; 76 FILE f; 77 struct __sfileext fext; 78 unsigned char dummy[1]; 79 80 _DIAGASSERT(n == 0 || str != NULL); 81 _DIAGASSERT(fmt != NULL); 82 83 if (n > INT_MAX) { 84 errno = EOVERFLOW; 85 return -1; 86 } 87 88 _FILEEXT_SETUP(&f, &fext); 89 f._file = -1; 90 f._flags = __SWR | __SSTR; 91 if (n == 0) { 92 f._bf._base = f._p = dummy; 93 f._bf._size = f._w = 0; 94 } else { 95 f._bf._base = f._p = (unsigned char *)str; 96 _DIAGASSERT(__type_fit(int, n - 1)); 97 f._bf._size = f._w = (int)(n - 1); 98 } 99 ret = __vfprintf_unlocked_l(&f, loc, fmt, ap); 100 *f._p = 0; 101 return ret; 102 } 103 104 int 105 vsnprintf(char *str, size_t n, const char *fmt, va_list ap) 106 { 107 return vsnprintf_l(str, n, _current_locale(), fmt, ap); 108 } 109 110 int 111 snprintf(char *str, size_t n, const char *fmt, ...) 112 { 113 va_list ap; 114 int ret; 115 116 va_start(ap, fmt); 117 ret = vsnprintf(str, n, fmt, ap); 118 va_end(ap); 119 return ret; 120 } 121 122 int 123 snprintf_l(char *str, size_t n, locale_t loc, const char *fmt, ...) 124 { 125 va_list ap; 126 int ret; 127 128 va_start(ap, fmt); 129 ret = vsnprintf_l(str, n, loc, fmt, ap); 130 va_end(ap); 131 return ret; 132 } 133