lib/libthr/thread/thr_printf.c

   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