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  1. /*
  2.  * Copyright (c) 2006 Josef Cejka
  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.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <stdarg.h>
  36. #include <stdio.h>
  37. #include <unistd.h>
  38. #include <io/printf_core.h>
  39. #include <futex.h>
  40. #include <async.h>
  41. #include <console.h>
  42.  
  43. static atomic_t printf_futex = FUTEX_INITIALIZER;
  44.  
  45. static int vprintf_str_write(const char *str, size_t size, void *data)
  46. {
  47.     size_t offset = 0;
  48.     size_t prev;
  49.     count_t chars = 0;
  50.    
  51.     while (offset < size) {
  52.         prev = offset;
  53.         str_decode(str, &offset, size);
  54.         console_write(str + prev, offset - prev);
  55.         chars++;
  56.     }
  57.    
  58.     return chars;
  59. }
  60.  
  61. static int vprintf_wstr_write(const wchar_t *str, size_t size, void *data)
  62. {
  63.     size_t offset = 0;
  64.     size_t boff;
  65.     count_t chars = 0;
  66.     char buf[4];
  67.    
  68.     while (offset < size) {
  69.         boff = 0;
  70.         chr_encode(str[chars], buf, &boff, 4);
  71.         console_write(buf, boff);
  72.         chars++;
  73.         offset += sizeof(wchar_t);
  74.     }
  75.    
  76.     return chars;
  77. }
  78.  
  79.  
  80. /** Print formatted text.
  81.  * @param fmt   format string
  82.  * @param ap    format parameters
  83.  * \see For more details about format string see printf_core.
  84.  */
  85. int vprintf(const char *fmt, va_list ap)
  86. {
  87.     struct printf_spec ps = {
  88.         vprintf_str_write,
  89.         vprintf_wstr_write,
  90.          NULL
  91.     };
  92.     /*
  93.      * Prevent other threads to execute printf_core()
  94.      */
  95.     futex_down(&printf_futex);
  96.     /*
  97.      * Prevent other pseudo threads of the same thread
  98.      * to execute printf_core()
  99.      */
  100.     async_serialize_start();
  101.     int ret = printf_core(fmt, &ps, ap);
  102.     async_serialize_end();
  103.     futex_up(&printf_futex);
  104.     return ret;
  105. }
  106.  
  107. /** @}
  108.  */
  109.