1 /* $NetBSD: snprintf_ss.c,v 1.2 2006/10/29 16:22:17 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[] = "@(#)snprintf.c 8.1 (Berkeley) 6/4/93"; 39 #else 40 __RCSID("$NetBSD: snprintf_ss.c,v 1.2 2006/10/29 16:22:17 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 <stdarg.h> 49 #include <stdio.h> 50 51 #include "reentrant.h" 52 #include "local.h" 53 54 #ifdef __weak_alias 55 __weak_alias(snprintf_ss,_snprintf_ss) 56 #endif 57 58 int 59 snprintf_ss(char *str, size_t n, char const *fmt, ...) 60 { 61 int ret; 62 va_list ap; 63 FILE f; 64 struct __sfileext fext; 65 unsigned char dummy[1]; 66 67 _DIAGASSERT(n == 0 || str != NULL); 68 _DIAGASSERT(fmt != NULL); 69 70 if ((int)n < 0) { 71 errno = EINVAL; 72 return (-1); 73 } 74 va_start(ap, fmt); 75 _FILEEXT_SETUP(&f, &fext); 76 f._file = -1; 77 f._flags = __SWR | __SSTR | __SAFE; 78 if (n == 0) { 79 f._bf._base = f._p = dummy; 80 f._bf._size = f._w = 0; 81 } else { 82 f._bf._base = f._p = (unsigned char *)str; 83 f._bf._size = f._w = n - 1; 84 } 85 ret = __vfprintf_unlocked(&f, fmt, ap); 86 *f._p = 0; 87 va_end(ap); 88 return (ret); 89 } 90