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