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  * $DragonFly: src/lib/libthread_xu/thread/thr_printf.c,v 1.1 2005/02/01 12:38:27 davidxu Exp $
  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 "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         static const char digits[16] = "0123456789abcdef";
  55         va_list  ap;
  56         char buf[20];
  57         char *s;
  58         unsigned long r, u;
  59         int c;
  60         long d;
  61         int islong;
  62
  63         va_start(ap, fmt);
  64         while ((c = *fmt++)) {
  65                 islong = 0;
  66                 if (c == '%') {
  67 next:                   c = *fmt++;
  68                         if (c == '\0')
  69                                 goto out;
  70                         switch (c) {
  71                         case 'c':
  72                                 pchar(fd, va_arg(ap, int));
  73                                 continue;
  74                         case 's':
  75                                 pstr(fd, va_arg(ap, char *));
  76                                 continue;
  77                         case 'l':
  78                                 islong = 1;
  79                                 goto next;
  80                         case 'p':
  81                                 islong = 1;
  82                         case 'd':
  83                         case 'u':
  84                         case 'x':
  85                                 r = ((c == 'u') || (c == 'd')) ? 10 : 16;
  86                                 if (c == 'd') {
  87                                         if (islong)
  88                                                 d = va_arg(ap, unsigned long);
  89                                         else
  90                                                 d = va_arg(ap, unsigned);
  91                                         if (d < 0) {
  92                                                 pchar(fd, '-');
  93                                                 u = (unsigned long)(d * -1);
  94                                         } else
  95                                                 u = (unsigned long)d;
  96                                 } else {
  97                                         if (islong)
  98                                                 u = va_arg(ap, unsigned long);
  99                                         else
 100                                                 u = va_arg(ap, unsigned);
 101                                 }
 102                                 s = buf;
 103                                 do {
 104                                         *s++ = digits[u % r];
 105                                 } while (u /= r);
 106                                 while (--s >= buf)
 107                                         pchar(fd, *s);
 108                                 continue;
 109                         }
 110                 }
 111                 pchar(fd, c);
 112         }
 113 out:
 114         va_end(ap);
 115 }
 116
 117 /*
 118  * Write a single character to stdout, in a thread-safe manner.
 119  */
 120 static void
 121 pchar(int fd, char c)
 122 {
 123
 124         __sys_write(fd, &c, 1);
 125 }
 126
 127 /*
 128  * Write a string to stdout, in a thread-safe manner.
 129  */
 130 static void
 131 pstr(int fd, const char *s)
 132 {
 133
 134         __sys_write(fd, s, strlen(s));
 135 }
 136