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("$FreeBSD$"); 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 38 static void pchar(int fd, char c); 39 static 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 */ 52 void 53 _thread_printf(int fd, const char *fmt, ...) 54 { 55 static const char digits[16] = "0123456789abcdef"; 56 va_list ap; 57 char buf[20]; 58 char *s; 59 unsigned long r, u; 60 int c; 61 long d; 62 int islong; 63 64 va_start(ap, fmt); 65 while ((c = *fmt++)) { 66 islong = 0; 67 if (c == '%') { 68 next: c = *fmt++; 69 if (c == '\0') 70 goto out; 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 'l': 79 islong = 1; 80 goto next; 81 case 'p': 82 islong = 1; 83 case 'd': 84 case 'u': 85 case 'x': 86 r = ((c == 'u') || (c == 'd')) ? 10 : 16; 87 if (c == 'd') { 88 if (islong) 89 d = va_arg(ap, unsigned long); 90 else 91 d = va_arg(ap, unsigned); 92 if (d < 0) { 93 pchar(fd, '-'); 94 u = (unsigned long)(d * -1); 95 } else 96 u = (unsigned long)d; 97 } else { 98 if (islong) 99 u = va_arg(ap, unsigned long); 100 else 101 u = va_arg(ap, unsigned); 102 } 103 s = buf; 104 do { 105 *s++ = digits[u % r]; 106 } while (u /= r); 107 while (--s >= buf) 108 pchar(fd, *s); 109 continue; 110 } 111 } 112 pchar(fd, c); 113 } 114 out: 115 va_end(ap); 116 } 117 118 /* 119 * Write a single character to stdout, in a thread-safe manner. 120 */ 121 static void 122 pchar(int fd, char c) 123 { 124 125 __sys_write(fd, &c, 1); 126 } 127 128 /* 129 * Write a string to stdout, in a thread-safe manner. 130 */ 131 static void 132 pstr(int fd, const char *s) 133 { 134 135 __sys_write(fd, s, strlen(s)); 136 } 137 138