thr_printf.c revision 115260
1/*- 2 * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/lib/libthr/thread/thr_printf.c 115260 2003-05-23 09:48:20Z mtm $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/lib/libthr/thread/thr_printf.c 115260 2003-05-23 09:48:20Z mtm $"); 31 32#include <sys/types.h> 33#include <sys/fcntl.h> 34#include <sys/uio.h> 35#include <errno.h> 36#include <stdarg.h> 37#include <string.h> 38#include <unistd.h> 39#include <pthread.h> 40 41#include "thr_private.h" 42 43static void pchar(int fd, char c); 44static void pstr(int fd, const char *s); 45 46/* 47 * Write formatted output to stdout, in a thread-safe manner. 48 * 49 * Recognises the following conversions: 50 * %c -> char 51 * %d -> signed int (base 10) 52 * %s -> string 53 * %u -> unsigned int (base 10) 54 * %x -> unsigned int (base 16) 55 * %p -> unsigned int (base 16) 56 */ 57void 58_thread_printf(int fd, const char *fmt, ...) 59{ 60 static const char digits[16] = "0123456789abcdef"; 61 va_list ap; 62 char buf[10]; 63 char *s; 64 unsigned r, u; 65 int c, d; 66 67 va_start(ap, fmt); 68 while ((c = *fmt++)) { 69 if (c == '%') { 70 c = *fmt++; 71 switch (c) { 72 case 'c': 73 pchar(fd, va_arg(ap, int)); 74 continue; 75 case 's': 76 pstr(fd, va_arg(ap, char *)); 77 continue; 78 case 'd': 79 case 'u': 80 case 'p': 81 case 'x': 82 r = ((c == 'u') || (c == 'd')) ? 10 : 16; 83 if (c == 'd') { 84 d = va_arg(ap, unsigned); 85 if (d < 0) { 86 pchar(fd, '-'); 87 u = (unsigned)(d * -1); 88 } else 89 u = (unsigned)d; 90 } else 91 u = va_arg(ap, unsigned); 92 s = buf; 93 do { 94 *s++ = digits[u % r]; 95 } while (u /= r); 96 while (--s >= buf) 97 pchar(fd, *s); 98 continue; 99 } 100 } 101 pchar(fd, c); 102 } 103 va_end(ap); 104} 105 106/* 107 * Write a single character to stdout, in a thread-safe manner. 108 */ 109static void 110pchar(int fd, char c) 111{ 112 113 write(fd, &c, 1); 114} 115 116/* 117 * Write a string to stdout, in a thread-safe manner. 118 */ 119static void 120pstr(int fd, const char *s) 121{ 122 123 write(fd, s, strlen(s)); 124} 125 126