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  1. /*
  2.  * Copyright (C) 2006 Martin Decky
  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 "printf.h"
  30. #include "ofw.h"
  31.  
  32. static char digits[] = "0123456789abcdef";  /**< Hexadecimal characters */
  33.  
  34.  
  35. void puts(const char *str)
  36. {
  37.     int len = 0;
  38.    
  39.     while (str[len] != 0)
  40.         len++;
  41.    
  42.     ofw_write(str, len);
  43. }
  44.  
  45.  
  46. /** Print hexadecimal digits
  47.  *
  48.  * Print fixed count of hexadecimal digits from
  49.  * the number num. The digits are printed in
  50.  * natural left-to-right order starting with
  51.  * the width-th digit.
  52.  *
  53.  * @param num   Number containing digits.
  54.  * @param width Count of digits to print.
  55.  *
  56.  */
  57. static void print_fixed_hex(const __u64 num, const int width)
  58. {
  59.     int i;
  60.    
  61.     for (i = width * 8 - 4; i >= 0; i -= 4)
  62.         ofw_write(digits + ((num >> i) & 0xf), 1);
  63. }
  64.  
  65.  
  66. /** Print number in given base
  67.  *
  68.  * Print significant digits of a number in given
  69.  * base.
  70.  *
  71.  * @param num  Number to print.
  72.  * @param base Base to print the number in (should
  73.  *             be in range 2 .. 16).
  74.  *
  75.  */
  76. static void print_number(const __native num, const unsigned int base)
  77. {
  78.     int val = num;
  79.     char d[sizeof(__native) * 8 + 1];       /* this is good enough even for base == 2 */
  80.     int i = sizeof(__native) * 8 - 1;
  81.    
  82.     do {
  83.         d[i--] = digits[val % base];
  84.     } while (val /= base);
  85.    
  86.     d[sizeof(__native) * 8] = 0;   
  87.     puts(&d[i + 1]);
  88. }
  89.  
  90.  
  91. /** General formatted text print
  92.  *
  93.  * Print text formatted according the fmt parameter
  94.  * and variant arguments. Each formatting directive
  95.  * begins with \% (percentage) character and one of the
  96.  * following character:
  97.  *
  98.  * \%    Prints the percentage character.
  99.  *
  100.  * s    The next variant argument is treated as char*
  101.  *      and printed as a NULL terminated string.
  102.  *
  103.  * c    The next variant argument is treated as a single char.
  104.  *
  105.  * p    The next variant argument is treated as a maximum
  106.  *      bit-width integer with respect to architecture
  107.  *      and printed in full hexadecimal width.
  108.  *
  109.  * P    As with 'p', but '0x' is prefixed.
  110.  *
  111.  * q    The next variant argument is treated as a 64b integer
  112.  *      and printed in full hexadecimal width.
  113.  *
  114.  * Q    As with 'q', but '0x' is prefixed.
  115.  *
  116.  * l    The next variant argument is treated as a 32b integer
  117.  *      and printed in full hexadecimal width.
  118.  *
  119.  * L    As with 'l', but '0x' is prefixed.
  120.  *
  121.  * w    The next variant argument is treated as a 16b integer
  122.  *      and printed in full hexadecimal width.
  123.  *
  124.  * W    As with 'w', but '0x' is prefixed.
  125.  *
  126.  * b    The next variant argument is treated as a 8b integer
  127.  *      and printed in full hexadecimal width.
  128.  *
  129.  * B    As with 'b', but '0x' is prefixed.
  130.  *
  131.  * d    The next variant argument is treated as integer
  132.  *      and printed in standard decimal format (only significant
  133.  *      digits).
  134.  *
  135.  * x    The next variant argument is treated as integer
  136.  *      and printed in standard hexadecimal format (only significant
  137.  *      digits).
  138.  *
  139.  * X    As with 'x', but '0x' is prefixed.
  140.  *
  141.  * All other characters from fmt except the formatting directives
  142.  * are printed in verbatim.
  143.  *
  144.  * @param fmt Formatting NULL terminated string.
  145.  */
  146. void printf(const char *fmt, ...)
  147. {
  148.     int i = 0;
  149.     va_list ap;
  150.     char c;
  151.    
  152.     va_start(ap, fmt);
  153.    
  154.     while ((c = fmt[i++])) {
  155.         switch (c) {
  156.            
  157.             /* control character */
  158.             case '%':
  159.                
  160.                 switch (c = fmt[i++]) {
  161.                    
  162.                     /* percentile itself */
  163.                     case '%':
  164.                         break;
  165.                    
  166.                     /*
  167.                      * String and character conversions.
  168.                      */
  169.                     case 's':
  170.                         puts(va_arg(ap, char_ptr));
  171.                         goto loop;
  172.                    
  173.                     case 'c':
  174.                         c = (char) va_arg(ap, int);
  175.                         break;
  176.                    
  177.                     /*
  178.                      * Hexadecimal conversions with fixed width.
  179.                      */
  180.                     case 'P':
  181.                         puts("0x");
  182.                     case 'p':
  183.                         print_fixed_hex(va_arg(ap, __native), sizeof(__native));
  184.                         goto loop;
  185.                    
  186.                     case 'Q':
  187.                         puts("0x");
  188.                     case 'q':
  189.                         print_fixed_hex(va_arg(ap, __u64), INT64);
  190.                         goto loop;
  191.                    
  192.                     case 'L':
  193.                         puts("0x");
  194.                     case 'l':
  195.                         print_fixed_hex(va_arg(ap, __native), INT32);
  196.                         goto loop;
  197.                    
  198.                     case 'W':
  199.                         puts("0x");
  200.                     case 'w':
  201.                         print_fixed_hex(va_arg(ap, __native), INT16);
  202.                         goto loop;
  203.                    
  204.                     case 'B':
  205.                         puts("0x");
  206.                     case 'b':
  207.                         print_fixed_hex(va_arg(ap, __native), INT8);
  208.                         goto loop;
  209.                    
  210.                     /*
  211.                      * Decimal and hexadecimal conversions.
  212.                      */
  213.                     case 'd':
  214.                         print_number(va_arg(ap, __native), 10);
  215.                         goto loop;
  216.                    
  217.                     case 'X':
  218.                         puts("0x");
  219.                     case 'x':
  220.                         print_number(va_arg(ap, __native), 16);
  221.                         goto loop;
  222.                    
  223.                     /*
  224.                      * Bad formatting.
  225.                      */
  226.                     default:
  227.                         goto out;
  228.             }
  229.            
  230.             default:
  231.                 if (c == '\n')
  232.                     ofw_write("\r", 1);
  233.                 ofw_write(&c, 1);
  234.         }
  235.    
  236. loop:
  237.         ;
  238.     }
  239.    
  240. out:
  241.    
  242.     va_end(ap);
  243. }
  244.