lib/libthread_xu/thread/thr_printf.c

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