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 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if defined(LIBC_SCCS) && !defined(lint) 34static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93"; 35#endif /* LIBC_SCCS and not lint */ 36#include <sys/cdefs.h> 37__FBSDID("$FreeBSD: src/lib/libc/stdio/vsnprintf.c,v 1.24 2008/04/17 22:17:54 jhb Exp $"); 38 39#include "xlocale_private.h" 40 41#include <limits.h> 42#include <stdio.h> 43#include "local.h" 44 45__private_extern__ int 46_vsnprintf(printf_comp_t __restrict pc, printf_domain_t __restrict domain, char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt, __va_list ap) 47{ 48 size_t on; 49 int ret; 50 char dummy[2]; 51 FILE f; 52 struct __sFILEX ext; 53 f._extra = &ext; 54 INITEXTRA(&f); 55 56 on = n; 57 if (n != 0) 58 n--; 59 if (n > INT_MAX) 60 n = INT_MAX; 61 /* Stdio internals do not deal correctly with zero length buffer */ 62 if (n == 0) { 63 if (on > 0) 64 *str = '\0'; 65 str = dummy; 66 n = 1; 67 } 68 f._file = -1; 69 f._flags = __SWR | __SSTR; 70 f._bf._base = f._p = (unsigned char *)str; 71 f._bf._size = f._w = n; 72 f._orientation = 0; 73 memset(&f._mbstate, 0, sizeof(mbstate_t)); 74 ret = __v2printf(pc, domain, &f, loc, fmt, ap); 75 if (on > 0) 76 *f._p = '\0'; 77 return (ret); 78} 79int 80vsnprintf_l(char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt, 81 __va_list ap) 82{ 83 return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, loc, fmt, ap); 84} 85 86int 87vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt, 88 __va_list ap) 89{ 90 return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, __current_locale(), fmt, ap); 91} 92