1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #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 va_list ap; 56 57 va_start(ap, fmt); 58 _thread_vprintf(fd, fmt, ap); 59 va_end(ap); 60 } 61 62 void 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 == '%') { 77 next: 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 /* FALLTHROUGH */ 97 case 'd': 98 case 'u': 99 case 'x': 100 if (c == 'x' && isalt) 101 pstr(fd, "0x"); 102 r = ((c == 'u') || (c == 'd')) ? 10 : 16; 103 if (c == 'd') { 104 if (islong) 105 d = va_arg(ap, unsigned long); 106 else 107 d = va_arg(ap, unsigned); 108 if (d < 0) { 109 pchar(fd, '-'); 110 u = (unsigned long)(d * -1); 111 } else 112 u = (unsigned long)d; 113 } else { 114 if (islong) 115 u = va_arg(ap, unsigned long); 116 else 117 u = va_arg(ap, unsigned); 118 } 119 s = buf; 120 do { 121 *s++ = digits[u % r]; 122 } while (u /= r); 123 while (--s >= buf) 124 pchar(fd, *s); 125 continue; 126 } 127 } 128 pchar(fd, c); 129 } 130 } 131 132 /* 133 * Write a single character to stdout, in a thread-safe manner. 134 */ 135 static void 136 pchar(int fd, char c) 137 { 138 139 __sys_write(fd, &c, 1); 140 } 141 142 /* 143 * Write a string to stdout, in a thread-safe manner. 144 */ 145 static void 146 pstr(int fd, const char *s) 147 { 148 149 __sys_write(fd, s, strlen(s)); 150 } 151 152