1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Jonathan Mini <mini@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <stdarg.h> 33 #include <string.h> 34 #include <unistd.h> 35 #include <pthread.h> 36 37 #include "libc_private.h" 38 #include "thr_private.h" 39 40 static void pchar(int fd, char c); 41 static void pstr(int fd, const char *s); 42 43 /* 44 * Write formatted output to stdout, in a thread-safe manner. 45 * 46 * Recognises the following conversions: 47 * %c -> char 48 * %d -> signed int (base 10) 49 * %s -> string 50 * %u -> unsigned int (base 10) 51 * %x -> unsigned int (base 16) 52 * %p -> unsigned int (base 16) 53 */ 54 void 55 _thread_printf(int fd, const char *fmt, ...) 56 { 57 va_list ap; 58 59 va_start(ap, fmt); 60 _thread_vprintf(fd, fmt, ap); 61 va_end(ap); 62 } 63 64 void 65 _thread_vprintf(int fd, const char *fmt, va_list ap) 66 { 67 static const char digits[16] = "0123456789abcdef"; 68 char buf[20]; 69 char *s; 70 unsigned long r, u; 71 int c; 72 long d; 73 int islong, isalt; 74 75 while ((c = *fmt++)) { 76 isalt = 0; 77 islong = 0; 78 if (c == '%') { 79 next: c = *fmt++; 80 if (c == '\0') 81 return; 82 switch (c) { 83 case '#': 84 isalt = 1; 85 goto next; 86 case 'c': 87 pchar(fd, va_arg(ap, int)); 88 continue; 89 case 's': 90 pstr(fd, va_arg(ap, char *)); 91 continue; 92 case 'l': 93 islong = 1; 94 goto next; 95 case 'p': 96 pstr(fd, "0x"); 97 islong = 1; 98 /* FALLTHROUGH */ 99 case 'd': 100 case 'u': 101 case 'x': 102 if (c == 'x' && isalt) 103 pstr(fd, "0x"); 104 r = ((c == 'u') || (c == 'd')) ? 10 : 16; 105 if (c == 'd') { 106 if (islong) 107 d = va_arg(ap, unsigned long); 108 else 109 d = va_arg(ap, unsigned); 110 if (d < 0) { 111 pchar(fd, '-'); 112 u = (unsigned long)(d * -1); 113 } else 114 u = (unsigned long)d; 115 } else { 116 if (islong) 117 u = va_arg(ap, unsigned long); 118 else 119 u = va_arg(ap, unsigned); 120 } 121 s = buf; 122 do { 123 *s++ = digits[u % r]; 124 } while (u /= r); 125 while (--s >= buf) 126 pchar(fd, *s); 127 continue; 128 } 129 } 130 pchar(fd, c); 131 } 132 } 133 134 /* 135 * Write a single character to stdout, in a thread-safe manner. 136 */ 137 static void 138 pchar(int fd, char c) 139 { 140 141 __sys_write(fd, &c, 1); 142 } 143 144 /* 145 * Write a string to stdout, in a thread-safe manner. 146 */ 147 static void 148 pstr(int fd, const char *s) 149 { 150 151 __sys_write(fd, s, strlen(s)); 152 } 153 154