lib/libkse/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 <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include "thr_private.h"
  35
  36 static void     pchar(int fd, char c);
  37 static void     pstr(int fd, const char *s);
  38
  39 /*
  40  * Write formatted output to stdout, in a thread-safe manner.
  41  *
  42  * Recognises the following conversions:
  43  *      %c      -> char
  44  *      %d      -> signed int (base 10)
  45  *      %s      -> string
  46  *      %u      -> unsigned int (base 10)
  47  *      %x      -> unsigned int (base 16)
  48  *      %p      -> unsigned int (base 16)
  49  */
  50 void
  51 _thread_printf(int fd, const char *fmt, ...)
  52 {
  53         static const char digits[16] = "0123456789abcdef";
  54         va_list  ap;
  55         char buf[20];
  56         char *s;
  57         unsigned long r, u;
  58         int c;
  59         long d;
  60         int islong;
  61
  62         va_start(ap, fmt);
  63         while ((c = *fmt++)) {
  64                 islong = 0;
  65                 if (c == '%') {
  66 next:                   c = *fmt++;
  67                         if (c == '\0')
  68                                 goto out;
  69                         switch (c) {
  70                         case 'c':
  71                                 pchar(fd, va_arg(ap, int));
  72                                 continue;
  73                         case 's':
  74                                 pstr(fd, va_arg(ap, char *));
  75                                 continue;
  76                         case 'l':
  77                                 islong = 1;
  78                                 goto next;
  79                         case 'p':
  80                                 islong = 1;
  81                         case 'd':
  82                         case 'u':
  83                         case 'x':
  84                                 r = ((c == 'u') || (c == 'd')) ? 10 : 16;
  85                                 if (c == 'd') {
  86                                         if (islong)
  87                                                 d = va_arg(ap, unsigned long);
  88                                         else
  89                                                 d = va_arg(ap, unsigned);
  90                                         if (d < 0) {
  91                                                 pchar(fd, '-');
  92                                                 u = (unsigned long)(d * -1);
  93                                         } else
  94                                                 u = (unsigned long)d;
  95                                 } else {
  96                                         if (islong)
  97                                                 u = va_arg(ap, unsigned long);
  98                                         else
  99                                                 u = va_arg(ap, unsigned);
 100                                 }
 101                                 s = buf;
 102                                 do {
 103                                         *s++ = digits[u % r];
 104                                 } while (u /= r);
 105                                 while (--s >= buf)
 106                                         pchar(fd, *s);
 107                                 continue;
 108                         }
 109                 }
 110                 pchar(fd, c);
 111         }
 112 out:
 113         va_end(ap);
 114 }
 115
 116 /*
 117  * Write a single character to stdout, in a thread-safe manner.
 118  */
 119 static void
 120 pchar(int fd, char c)
 121 {
 122
 123         __sys_write(fd, &c, 1);
 124 }
 125
 126 /*
 127  * Write a string to stdout, in a thread-safe manner.
 128  */
 129 static void
 130 pstr(int fd, const char *s)
 131 {
 132
 133         __sys_write(fd, s, strlen(s));
 134 }
 135