lib/libthr/thread/thr_printf.c

   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