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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  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. #include <putchar.h>
  30. #include <print.h>
  31. #include <synch/spinlock.h>
  32. #include <arch/arg.h>
  33.  
  34.  
  35. static char digits[] = "0123456789abcdef"; /**< Hexadecimal characters */
  36. static spinlock_t printflock;              /**< printf spinlock */
  37.  
  38.  
  39. /** Print NULL terminated string
  40.  *
  41.  * Print characters from str using putchar() until
  42.  * \x00 character is reached.
  43.  *
  44.  * @param str Characters to print.
  45.  *
  46.  */
  47. void print_str(char *str)
  48. {
  49.         int i = 0;
  50.     char c;
  51.    
  52.     while (c = str[i++])
  53.         putchar(c);
  54. }
  55.  
  56.  
  57. /** Print hexadecimal digits
  58.  *
  59.  * Print fixed count of hexadecimal digits from
  60.  * the number num. The digits are printed in
  61.  * natural left-to-right order starting with
  62.  * the width-th digit.
  63.  *
  64.  * @param num   Number containing digits.
  65.  * @param width Count of digits to print.
  66.  *
  67.  */
  68. void print_fixed_hex(__native num, int width)
  69. {
  70.     int i;
  71.    
  72.     for (i = width*8 - 4; i >= 0; i -= 4)
  73.         putchar(digits[(num>>i) & 0xf]);
  74. }
  75.  
  76.  
  77. /** Print number in given base
  78.  *
  79.  * Print significant digits of a number in given
  80.  * base.
  81.  *
  82.  * @param num  Number to print.
  83.  * @param base Base to print the number in (should
  84.  *             be in range 2 .. 16).
  85.  *
  86.  */
  87. void print_number(__native num, int base)
  88. {
  89.     char d[sizeof(__native)*8+1];       /* this is good enough even for base == 2 */
  90.         int i = sizeof(__native)*8-1;
  91.    
  92.     do {
  93.         d[i--] = digits[num % base];
  94.     } while (num /= base);
  95.    
  96.     d[sizeof(__native)*8] = 0; 
  97.     print_str(&d[i + 1]);
  98. }
  99.  
  100.  
  101. /** General formatted text print
  102.  *
  103.  * Print text formatted according the fmt parameter
  104.  * and variant arguments. Each formatting directive
  105.  * begins with % (percentage) character and one of the
  106.  * following character:
  107.  *
  108.  * %    Prints the percentage character.
  109.  * s    The next variant argument is threated as char*
  110.  *      and printed as a NULL terminated string.
  111.  * c    The next variant argument is threated as a single char.
  112.  * l    The next variant argument is threated as a 32b integer
  113.  *      and printed in full hexadecimal width.
  114.  * L    As with 'l', but '0x' is prefixed.
  115.  * w    The next variant argument is threated as a 16b integer
  116.  *      and printed in full hexadecimal width.
  117.  * W    As with 'w', but '0x' is prefixed.
  118.  * b    The next variant argument is threated as a 8b integer
  119.  *      and printed in full hexadecimal width.
  120.  * N    As with 'b', but '0x' is prefixed.
  121.  * d    The next variant argument is threated as integer
  122.  *      and printed in standard decimal format (only significant
  123.  *      digits).
  124.  * x    The next variant argument is threated as integer
  125.  *      and printed in standard hexadecimal format (only significant
  126.  *      digits).
  127.  * X    As with 'x', but '0x' is prefixed.
  128.  *
  129.  * All other characters from fmt except the formatting directives
  130.  * are printed in verbatim.
  131.  *
  132.  * @param fmt Formatting NULL terminated string.
  133.  *
  134.  */
  135. void printf(char *fmt, ...)
  136. {
  137.     int irqpri, i = 0;
  138.     va_list ap;
  139.     char c;
  140.  
  141.     va_start(ap, fmt);
  142.  
  143.     irqpri = cpu_priority_high();
  144.     spinlock_lock(&printflock);
  145.  
  146.     while (c = fmt[i++]) {
  147.         switch (c) {
  148.  
  149.             /* control character */
  150.             case '%':
  151.                 switch (c = fmt[i++]) {
  152.  
  153.                 /* percentile itself */
  154.                 case '%':
  155.                     break;
  156.  
  157.                 /*
  158.                  * String and character conversions.
  159.                  */
  160.                 case 's':
  161.                     print_str(va_arg(ap, char_ptr));
  162.                     goto loop;
  163.  
  164.                 case 'c':
  165.                     c = (char) va_arg(ap, int);
  166.                     break;
  167.  
  168.                 /*
  169.                          * Hexadecimal conversions with fixed width.
  170.                          */
  171.                 case 'L':
  172.                     print_str("0x");
  173.                 case 'l':
  174.                         print_fixed_hex(va_arg(ap, __native), INT32);
  175.                     goto loop;
  176.  
  177.                 case 'W':
  178.                     print_str("0x");
  179.                 case 'w':
  180.                         print_fixed_hex(va_arg(ap, __native), INT16);
  181.                     goto loop;
  182.  
  183.                 case 'B':
  184.                     print_str("0x");
  185.                 case 'b':
  186.                         print_fixed_hex(va_arg(ap, __native), INT8);
  187.                     goto loop;
  188.  
  189.                 /*
  190.                          * Decimal and hexadecimal conversions.
  191.                          */
  192.                 case 'd':
  193.                         print_number(va_arg(ap, __native), 10);
  194.                     goto loop;
  195.  
  196.                 case 'X':
  197.                             print_str("0x");
  198.                 case 'x':
  199.                         print_number(va_arg(ap, __native), 16);
  200.                     goto loop;
  201.        
  202.                 /*
  203.                  * Bad formatting.
  204.                  */
  205.                 default:
  206.                     goto out;
  207.                 }
  208.  
  209.             default: putchar(c);
  210.         }
  211.    
  212. loop:
  213.         ;
  214.     }
  215.  
  216. out:
  217.     spinlock_unlock(&printflock);
  218.     cpu_priority_restore(irqpri);
  219.    
  220.     va_end(ap);
  221. }
  222.