1/* $NetBSD: dprintf.c,v 1.1.1.3 2023/08/18 18:36:49 christos Exp $ */ 2 3/* 4 * Copyright (c) Ian F. Darwin 1986-1995. 5 * Software written by Ian F. Darwin and others; 6 * maintained 1995-present by Christos Zoulas and others. 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 immediately at the beginning of the file, without modification, 13 * this list of conditions, and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30#include "file.h" 31 32#ifndef lint 33#if 0 34FILE_RCSID("@(#)$File: dprintf.c,v 1.4 2022/09/24 20:30:13 christos Exp $") 35#else 36__RCSID("$NetBSD: dprintf.c,v 1.1.1.3 2023/08/18 18:36:49 christos Exp $"); 37#endif 38#endif /* lint */ 39 40#include <assert.h> 41#include <unistd.h> 42#include <stdio.h> 43#include <stdarg.h> 44 45int 46dprintf(int fd, const char *fmt, ...) 47{ 48 va_list ap; 49 /* Simpler than using vasprintf() here, since we never need more */ 50 char buf[1024]; 51 int len; 52 53 va_start(ap, fmt); 54 len = vsnprintf(buf, sizeof(buf), fmt, ap); 55 va_end(ap); 56 57 if ((size_t)len >= sizeof(buf)) 58 return -1; 59 60 if (write(fd, buf, (size_t)len) != len) 61 return -1; 62 63 return len; 64} 65