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