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 <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 va_list ap; 55 56 va_start(ap, fmt); 57 _thread_vprintf(fd, fmt, ap); 58 va_end(ap); 59 } 60 61 void 62 _thread_vprintf(int fd, const char *fmt, va_list ap) 63 { 64 static const char digits[16] = "0123456789abcdef"; 65 char buf[20]; 66 char *s; 67 unsigned long r, u; 68 int c; 69 long d; 70 int islong, isalt; 71 72 while ((c = *fmt++)) { 73 isalt = 0; 74 islong = 0; 75 if (c == '%') { 76 next: c = *fmt++; 77 if (c == '\0') 78 return; 79 switch (c) { 80 case '#': 81 isalt = 1; 82 goto next; 83 case 'c': 84 pchar(fd, va_arg(ap, int)); 85 continue; 86 case 's': 87 pstr(fd, va_arg(ap, char *)); 88 continue; 89 case 'l': 90 islong = 1; 91 goto next; 92 case 'p': 93 pstr(fd, "0x"); 94 islong = 1; 95 /* FALLTHROUGH */ 96 case 'd': 97 case 'u': 98 case 'x': 99 if (c == 'x' && isalt) 100 pstr(fd, "0x"); 101 r = ((c == 'u') || (c == 'd')) ? 10 : 16; 102 if (c == 'd') { 103 if (islong) 104 d = va_arg(ap, unsigned long); 105 else 106 d = va_arg(ap, unsigned); 107 if (d < 0) { 108 pchar(fd, '-'); 109 u = (unsigned long)(d * -1); 110 } else 111 u = (unsigned long)d; 112 } else { 113 if (islong) 114 u = va_arg(ap, unsigned long); 115 else 116 u = va_arg(ap, unsigned); 117 } 118 s = buf; 119 do { 120 *s++ = digits[u % r]; 121 } while (u /= r); 122 while (--s >= buf) 123 pchar(fd, *s); 124 continue; 125 } 126 } 127 pchar(fd, c); 128 } 129 } 130 131 /* 132 * Write a single character to stdout, in a thread-safe manner. 133 */ 134 static void 135 pchar(int fd, char c) 136 { 137 138 __sys_write(fd, &c, 1); 139 } 140 141 /* 142 * Write a string to stdout, in a thread-safe manner. 143 */ 144 static void 145 pstr(int fd, const char *s) 146 { 147 148 __sys_write(fd, s, strlen(s)); 149 } 150 151