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