thr_printf.c revision 303975
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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: releng/11.0/lib/libthr/thread/thr_printf.c 301135 2016-06-01 16:11:09Z cem $"); 29 30#include <stdarg.h> 31#include <string.h> 32#include <unistd.h> 33#include <pthread.h> 34 35#include "libc_private.h" 36#include "thr_private.h" 37 38static void pchar(int fd, char c); 39static void pstr(int fd, const char *s); 40 41/* 42 * Write formatted output to stdout, in a thread-safe manner. 43 * 44 * Recognises the following conversions: 45 * %c -> char 46 * %d -> signed int (base 10) 47 * %s -> string 48 * %u -> unsigned int (base 10) 49 * %x -> unsigned int (base 16) 50 * %p -> unsigned int (base 16) 51 */ 52void 53_thread_printf(int fd, const char *fmt, ...) 54{ 55 va_list ap; 56 57 va_start(ap, fmt); 58 _thread_vprintf(fd, fmt, ap); 59 va_end(ap); 60} 61 62void 63_thread_vprintf(int fd, const char *fmt, va_list ap) 64{ 65 static const char digits[16] = "0123456789abcdef"; 66 char buf[20]; 67 char *s; 68 unsigned long r, u; 69 int c; 70 long d; 71 int islong, isalt; 72 73 while ((c = *fmt++)) { 74 isalt = 0; 75 islong = 0; 76 if (c == '%') { 77next: c = *fmt++; 78 if (c == '\0') 79 return; 80 switch (c) { 81 case '#': 82 isalt = 1; 83 goto next; 84 case 'c': 85 pchar(fd, va_arg(ap, int)); 86 continue; 87 case 's': 88 pstr(fd, va_arg(ap, char *)); 89 continue; 90 case 'l': 91 islong = 1; 92 goto next; 93 case 'p': 94 pstr(fd, "0x"); 95 islong = 1; 96 case 'd': 97 case 'u': 98 case 'x': 99 if (c == 'x' && isalt) 100 pstr(fd, "0x"); 101 r = ((c == 'u') || (c == 'd')) ? 10 : 16; 102 if (c == 'd') { 103 if (islong) 104 d = va_arg(ap, unsigned long); 105 else 106 d = va_arg(ap, unsigned); 107 if (d < 0) { 108 pchar(fd, '-'); 109 u = (unsigned long)(d * -1); 110 } else 111 u = (unsigned long)d; 112 } else { 113 if (islong) 114 u = va_arg(ap, unsigned long); 115 else 116 u = va_arg(ap, unsigned); 117 } 118 s = buf; 119 do { 120 *s++ = digits[u % r]; 121 } while (u /= r); 122 while (--s >= buf) 123 pchar(fd, *s); 124 continue; 125 } 126 } 127 pchar(fd, c); 128 } 129} 130 131/* 132 * Write a single character to stdout, in a thread-safe manner. 133 */ 134static void 135pchar(int fd, char c) 136{ 137 138 __sys_write(fd, &c, 1); 139} 140 141/* 142 * Write a string to stdout, in a thread-safe manner. 143 */ 144static void 145pstr(int fd, const char *s) 146{ 147 148 __sys_write(fd, s, strlen(s)); 149} 150 151